---
title: WWDC2004 Session 318
framework: wwdc
role: article
path: wwdc/wwdc2004-318
---

# WWDC2004 Session 318

## Transcript

Kind: captions Language: en morning everyone this is session 318 using Xcode for Java development please welcome Ted Jusuf ik Java engineer let's see where's that clicker so welcome to Xcode for Java development Wednesday morning halfway through the week rates get going so why are you here um basically if you do Java development on Mac OS 10 and you want to learn more about the tools that we provide if you want to know how Xcode can help you do Java development and if you want to know what's new and xcode for java development those are the questions that we're going to try and address at this session so it's more specifically what are we going to talk about well as you know there's been lots of Xcode updates we're going to talk about code completion which is something new for Java and Xcode we're also including ant now with your Xcode distributions and so we're going to be kind of going into that it's a direction we're moving in there's a application developer preview that will allow you to do a lot of j2ee development on your client machine we're going to talk briefly about that and then of course the java 142 update we're also going to talk go into detail about actually doing builds with Xcode and Java and then also debugging and then finalized with our 1.5 and talked about what you need to do to actually do development with that in Xcode because it's not completely there yet but it's it's very easy to get working so what is Xcode actually this all should just be review if by this point in the week you don't know what Xcode is well we'll show it to you but so a C++ C Objective C AppleScript Java IDE full Java debugger gdb integration Apple script debugger include with every Mac OS 10 updates available a course from connect apple comm we are also introducing this week preview so the 1.5 and 2.0 the 1.5 is for panther the 2.0 is for Tiger debuting will actually go into a little bit of the differences a little bit later on and like I said earlier those are both available from connect apple comm so at this point let me bring up debuting and give them to show you a demo of code sense thanks good morning so code sense actually is one of the big things new in Xcode this year we've had code sense in some form for quite some time the best support of course has been an objective C and C++ but now we're bringing some new stuff along to you Java developers so code sense is actually a group of technologies it's used for class browsing we have a symbol smart group in the main window there's a number of navigation capabilities that are provided by code sense and of course new is code completion for Java so code sense is based on indexing now indexing has gotten a bad rap with Xcode for Java for a little for a little while here we've improved the speed quite a bit indexing the system jdk jdk classes about is about ten times faster than it was in xcode 1.2 so you'll definitely notice that speed difference and in fact indexing of source files happens on another thread not on the main thread so it won't get in your way while you're while you're editing your files it's also important to know that code sense is something that's used by the java portion of Xcode for the debugger and also for the Jam based build system the debugger uses it so that it can actually get the correspondence between class files that are running and the source files that you're editing in the build system uses it to get dependency information so that it can speed up your build times so code completion I think if you guys are Java developers you've seen code completion on a number of IDs it allows you to automatically suggest a completion based on the current context that you're editing in in Xcode you can bring it up on demand or you can have it automatically come up you can have it limit the list that comes up to only those that match what you've typed so far that's something that's a little different from other IDE implementations something that I personally like quite a bit and when you insert method calls it'll insert placeholder strings for each of the arguments so as I said the Java support for code completion is new we actually had some completion there in well one one and one two but it was based on only the words in the current file so a little helpful not quite what you used to the preview is here at the conference in both Xcode 1 5 and 2.0 there are some known limitations it's not done yet it's definitely preview it's actually a little bit more stable in the one 5 release than it is in the 2.0 release just because everything around it is a little more stable so with that we still want to know what you like and what you don't like about it you're certainly welcome to tell us about some of the limitations you see while using it although I swear we do know about some of them it's not a surprise we know we're not done with that I'm going to do a little demonstration of code sense so let's bring up Xcode here and just create a new swing application let's see a new project and here we go okay there's one issue here this is X code 1.2 so Ted did you know that the X code 1.2 is on there can we switch over to this machine I'll do a demo on on Tiger it's a little less stable here which is why I wanted to do it on Panther but we'll go ahead and bring up X codon and show this here new project yeah can you switch demo machines please over to the demo one here sorry to change my mind on you okay so we have a new project here no that's good at least you guys can see it so there's the groups and file list over here on the left stuff you've seen before and a list of what's selected shows up on the right in the detail view the first thing I want to show you is the project symbol smart group so a smart group is something in Xcode that gets its contents dynamically from from the project itself in this case the the project symbol smart group shows you the symbols that are that have been indexed in your project only the stuff in your project it doesn't show anything that's brought in from frameworks or from the system JDK okay so we can go ahead and bring up an editor here and you can click around on it and of course take you to the location you you're looking for and you can filter so you can say oh let's search for any symbol that has the word about in it and it shows you that all right away another thing in Xcode is that you can command double click on words in your file to quickly navigate between them now I come in double click there and of course there are quite a few a few classes that implement set resizable so let's go ahead to the dialogue version of that so this is something also that's new in Xcode 1.5 and 2.0 we have the system classes indexed for you but we wouldn't show you any of their contents so here we're showing you a dump of the class file and you can you can move around it it only shows you essentially the api's it doesn't show you a dump of the bytecode or decompile but it does give you an idea of what api's are there okay with that let's go ahead and bring up the class browser for this project takes a second there's actually quite a lot of classes in here as you guys know what's that oh there we go sorry about that so it's got all the JDK clap JDK classes in here and you can click around between them you can of course limit what you're looking at so I only care about the classes in this project I'm gonna close this and then option click on the twisty triangle and it shows all the classes in your project in the hierarchy one nice that's nice thing you can also look at all the classes in a flat view this of course takes a second I forget how many thousands of classes there are here but there's many many many and if we were to click on one of those and wanted to see where it appeared in the hierarchy I don't know if this is a particularly interesting one that I've clicked on but one thing you can do is just switch back to the hierarchy view and it'll keep that selected it's down there at the bottom so you can see that that guy inherits from an action listener all right let me let's go ahead and close up the class browser well I'm gonna do a little editing here but what I want to do this is a standard swing application we'll go ahead and run it just to show you know it brings up the standard stuff it's got a preference box which is kind of boring quit out of that I'm gonna change the preference box a little and I'll show you code completion while I'm doing that so let's just see what symbols have to do with preferences and they come up so the first thing I'll do is preferences is the method in the in the application that brings up the Preferences box and I want to tell it to change its font so I'm gonna say prefs and if you hit option escape it'll bring up a list for you of what's available and it turns out that there it knows about the instance variable press prefs there which is of type pref pane and go ahead and hit tab to complete that how do you use that zoom feature actually you know I can do something almost as good let's go ahead and make that a little bit bigger and the tech sighs boy that is small isn't it that a little better yeah sorry about that okay so where was I preferences okay and actually while I do this let's go ahead into the preferences and show you quickly under the navigation there's options to automatically suggest I'm going to turn on the automatically suggest option here since that's actually the way I work and I prefer it that way so as you start to type it'll underline the text that you've typed in it says I know that there's something that can be completed and the underlying is that clue that there's something there and that it's ambiguous it doesn't know oh what is next but if I type a little bit more it says oh the only symbol that's next that has an F after it also has an O and you can bring up the list of course and see so there's set focusable and quite a few other routines there but I'm going to do a set font and if I hit tab and complete it it inserts a little placeholder there that tells you the type of the argument so I also know that there's a font instance variable there too and let's go ahead into the preference pane itself and we need to add a new method it turns out if you just set the font on the pain that won't affect the text inside it so we need to go in there too so we'll just click on one of those and start adding a new method there so it knows public and just continue on here we'll add set font and type font and just give it an argument named F and for this we'll call the superclass version of set font let's go ahead and Wow see this is this is why I didn't want to do it on Tiger so there is an issue here unfortunately with code completion that's that came in very at the last moment in Tiger it's a conflict between app kit and Xcode we fixed the bug since then but of course it didn't make it on your seed so now you'll see oops didn't mean to click on that that things aren't quite ready that would have worked just fine on pan Thor so I assure you that that's a well-known bug let's just go ahead and I'm gonna let's see talk about one more thing in Xcode showing that demo is not that amazing I mean it does actually set the preferences and change this style so the last thing I want to tell you about is index templates in Xcode so in order to speed up indexing even more so we've made indexing ten times faster for indexing your system class files well you can actually get rid of the time to index that all together and that's done using a feature called index templates and they're not set up for you by default on the machine but they are documented in there it's very easy to do it's just running one command-line application that will set them up for you and the instructions for doing that or down inside developer extras Xcode templates oh it's tiger that's right are you gonna say use spotlight ah anyhow so they're inside Xcode index templates here yeah we're not sure enough spotlight right and these instructions tell you how to set it up it's very easy it takes a couple of minutes for it to index everything it sets up index templates not just for Java but also for the for cocoa project types and carbon project types so what that does is that when you create a new project it'll instantly index all of the system files you don't have to do it every time you create a new project and when you rebuild your index if you were to do that which you shouldn't need to do nearly as much as you did in the past then that's is sped up quite a bit too ok with that I think we'll bring it back to Ted here ok all right so amp ants very important to the job in an environment and and it's a great build system for Java up to this point we've been focusing mainly on the jam build system with the addition of ant into the Xcode 1.5 and teeth out we're not abandoning that the jam stuff at all so you don't have to scramble and move your stuff over we're just we're providing options so in addition with this and you get a bunch of templates an empty project for built one for billion jar and one for billion an application jar so one with manifest and all that the ant that comes is one six one the latest release and you target using an external build target one thing to note we actually discovered another issue quite well we're quickly trying to get this out and that the one six one that we have and we're distributing is actually missing a few of the the the classes so while it works for most things if you discover that something is missing just go redownload the ant from ants website there's actually instructions it's just a direct replacement we don't do anything special except name the folder ant versus ant 1.6 and all that just replace the one on the drives and you're up and running so the application developers server preview this includes JBoss 3 to 3 it's actually the final candidate version of it or at the release candidate version actually it includes Tomcat extact late' and also an older version of ant the older version of ant is actually installed in a different location this version will be going away and we're gonna be using the new one in the 1.6 from the Xcode install currently the templates point to the old one because this actually came out before our Xcode update but just continue using it and at some point you may just need to switch your build file if you're using one of those templates but it's pretty easy a deal this is also available in the developer tools section of connect apple comm one of the things that we like to do is do demonstration of how easy it is to do servlets and JT EE applications we're actually doing a demo this in building your website on Apple Computer later I think it's Thursday afternoon so the application server in Xcode the the web module is one of the templates that's installed that's essentially servlet EJB module for doing a Java Bean and of course the enterprise application all those templates are included in that update one of the cool things about this is that when you install this server update it installs in a location that's the same location as if you deploying on Xserve with 10 server so if you build in and set up everything on this on the client machine using this you can then deploy to Xserve without having to worry about any directory configuration stuff or anything like that it's actually very easy of course you can deploy to any platform you know portable ant targets and all that so it's actually something really cool to check out additionally we came out with the one for to update for xcode this includes Jay and I headed stuff like that so if you had like the the 1.2 of install Xcode and you update to 1 for 2 and I'll send you of j'ni libraries when you're building breaks just download this one for to update and you'll get all the headers and all that they'll be installed in the right location of course on Tiger it comes with 1 4 to the Xcode 2.0 of course has all these updates this also includes source files and stuff our sources that we can legally release and documentation so definitely get get a hold of that so building an Xcode I'm not gonna go into so much the the philosophy and the the UI of Xcode but we are going to touch on at least some of this stuff for for the Java and focus on the Java portions of course on the left hand side you have your source files and stuff like that your products and your frameworks you know or jars you also have underneath that your targets and then of course your executables the Java targets you have the Jam targets and stuff like that the external targets you would normally use for calling ant or something like that or a make file and of course you have native targets for j'ni libraries executables this is where you select your your run debug configuration so if say you want to debug your j'ni library you can switch to gdb or if you want to debug the job of stuff you can use the Java debugger y'all do that on the xcode are in the executable your arguments that you're passing to your jar file or your application you set this all up from the executable and then any environment variables that you want to set so if you want to pass in I guess Java home or something like that that's something that you really don't need on our platform but I mean you can set that all up in the executable so I keep talking about extending xcode to ant is an external target and that's one of the ways that xcode allows for extending for Java stuff an additional way is in the build phases so if you have a gem target one of the things Jam does is it calls out to external tools and stuff like that so you can use either a shell script build phase and often use this for like signing files or something like that or a copy build phase I'm actually going to go into those right here so shell script build phase this is the kind of thing when you're doing J&I target use a Java H you call job H from the shell script build phase signing jar files the shell script build phase if you have an executable or a directory set up that you want to set up for your built end result the shell script build phase is useful for that that's what we actually use it for to cephalization files for packages also if you have like a bunch of say properties files you want to write or something like that and you want it to be dynamic you can use that in the shell script build phase the copies files build phase this is where you want to like move things into your your build results this is something where if like you have a J&I library you want to copy it into your application bundle if you want to if you have say one of the things that you can do is you can call out using runtime DXE to external tools so if you want to copy those into your application bundle copies files build phase nice thing about that you can hide everything within your application bundle and not have to worry about somebody you know throwing away things because they realize what it is and then I'll send your application breaks so I'm gonna give you a quick tour of Xcode let me go to the the Panther machine over here so what I'm doing right here is for the most of the talk we're actually going to focus on ant but like I said we're not really abandoning the jam stuff at all we're just providing the option so what I'm going to do is show you a little bit about some of the jam stuff that is in there currently in the 1.2 and in the 1.5 and 2.0 of course this is the targets and stuff that I talked about these are the all the files there's different ways that you can actually view them just double click on them I know this is all pretty rudimentary but for some people haven't really used it this is actually important for them and if you want to include a file on a target here's the check box for it so if you have it over here you can see of course that the build results aren't included in the target double-click on the target they'll actually bring up the property list this hasn't actually changed that much from a project builder so if you use it in there it's pretty much the same it's still in the the 1.2 the the panels that are important to you or the java the compiler settings this is where you can select java c jikes and stuff like that set your target JVM if you want to target something else the Java archive settings this is where you include a manifest file so if for some reason well of course we all want our double-click little jars to be launched Abul so what you do is you put the manifest file to root of the project and then just type in the name here and of course all these are properties so if you set something in there it'll show up in this list and you can go on and configure things manually so if you wanted to call it to another Java compiler or something like that Greg is actually going to show you that pure Java is specific down here these are the actually the P list entries and these are things that are used when you're launching your double clickable application these are the kind of things like your properties if you want to add additional properties for the the Macintosh platform I additional JVM options say if you want to do profiling or something like that you can type that in here set your your heap size set the current working directory to the contents Java the resources Java subdirectory this is say if the current working directory of the java application is normally just outside the execute of executable bundle but you can actually set to internal to the executable bundle so that when you're calling out to external tools or something like that or referring to property files there within the actual application bundle and sometimes this is just something if for some reason you say if you see an error can't launch the invoke the NS JVM or something like that it means this was accidentally checked just uncheck it so and then over here that's enough the targets pretty much for the jam stuff this is the executable and this is where you would you could create a custom one but you can go in you set your launch arguments things are passed to your application environment variables like I said this looks a little bit different in the 1.2 they actually have a couple of tabs across the top let me see if I got actually on this one I think it's the same look and feel and I can actually show it to you if we switch the machine can you do that for me real quick yeah over to this other machine let me just show you that real quick sweet I'm on the right 1/2 so let's go into here so looks a little bit different but arguments and then debugging this is where you actually set let's see I have an indexes project so it doesn't have all that yet but that's essentially where you set up all the jams stuff and that's kind of stuff that we currently provide we actually if you look at the the project builder documentation it will point you to clear all that up for you but we're actually coming out with new Xcode for Java documentation soon our tech pubs people are actively working on it so let's go back to the slides where are you there so I keep hitting this again but ant integration it's an external target it's the same as like a legacy make file target it's we're essentially calling out to an external build tool some of the arguments that you can pass to it the standard ones in our templates is what I have listed here but you can actually pass in any other kind of options you want it's you know you're calling out to an external tool so and then in the build styles if you've used xcode build styles for something else you can set environment variables and stuff like that they'll be passed on to the targets and then they have say you have say some sort of property that you want to pass in you can just add a dollar sign and then whatever the value is that you defined in the build style onto that executable line and that'll automatically be passed to it when you define that whenever you've done it you calling out to external target there's a lot of environment variables that we pass along if you look at the build settings notes under the help the help menu this will tell you a lot more about available options that you can kind of capitalize on so definitely check that out this is something that's kind of overlooked but a valuable piece of information so j2 I mean this is a we're not really promoting j2me on our platform but it's a great example of what you can use ant to build using build for on our platform I'm actually we're going in the DMZ we're going to provide a sample template for building Jade j2me midlet that will be in the disk image available tonight after for this session it's a custom executable like I said or it's a custom executable to run the mid Pete emulator you can use Bluetooth push it the file over from your be either your laptop your desktop machine actually let's go back to the slides actually real quick thank you it's a Bluetooth executable all right sorry about that use bluetooth to push it over when you're pushing over a jar file for mid P you can't define any properties in the jad file but if you if there's any properties that you need you can just define them in your actual executable and push it over and mid pecan actually is a jad file to define external additional properties that we'd be passed in when you're pushing over with bluetooth you can only send one file at a time so just define those within New York's acute Abul and oh yes I most importantly the emulator I'm using is actually from Mike powers website it's empowers dotnet and it's the mid P - OS OS X directory of course this URL is provided in the disk image so don't worry about writing it down and actually we just found out today that he's going to make available a j2me 2.0 emulator so as soon as that's available we'll make that available or at least point you to it he he'll probably will get it to you somehow I just heard about today so that's why I'm just kind of stumbling with that so let's actually go over to the Panther and let's do a quick j2me demo and so let's go over to the Panther machine and all right and let me go over I've already installed the template for the j2me and so if you follow the directions included in a disk image just we'll show you how to get that in there and once you do that it'll actually show up in Xcode as a project template so let me just go ahead and let me build it on the desktop let me just call it asteroids that's the ast er I'm a creative speller so I have to double checked all this and at this point it just pretty much just a hello world application let me launch x11 the current emulator the mid p10 emulator is an X 11 executable so let's go ahead just run this real quick and show you comes up there it is it's your phone on an emulator go ahead just launch HelloWorld not very exciting but proof of concept so but next step is let's actually go in and let's see this should be in my home directory and let's get this source what you see over here let me just go to intuit is that you got this blue source directory so I'm gonna go in delete that file it should go ahead and delete in there and that's copying these sources from over here and this is a it's a GPL version of asteroids game I just look on google for asteroids mid P and you should be able to find it and let's see the next step actually is the the manifest let me update those actually let's just go in and copy it in from the other directory the manifest on the jad file let's just copy that in a place place now in theory I should just go ahead and be able to build using the current template let's see build show build successful that's always a good sign I went through did did the whole build here and we should just be able to run it let's see if it actually runs oh no that's the whole world let's try this again oh this demo is not going well but the concept is and what we're doing is we're actually showing ant building for mid P and if you saw it earlier in the Java State of the Union it does build in everything like that the asteroids for Mac OS 10 but that's only a part of the story let's just send this file over actually to my Bluetooth phone so let me go into my home directory and I got the asteroids the bin and our the build bin and let me just send this jar file over and go ahead turn on the camera give it a second it tends to fall asleep there it goes and with any luck there's the camera phone notice the aspect ratio is not completely maintained but that it's a piece of sample code that's actually a cookie component right there and let's go ahead and send that file over that should wake up the phone unable to validate device all right these demos are all going pretty good today um but it does so basically what would happen is I'd send over the file the phone automatically wakes up which is actually pretty cool to see and it says do you want to accept this file it doesn't just blindly accept any file I say yes it downloads it starts the file and you got mid peep running on your your phone that you built on Mac OS 10 and it's actually pretty easy the sample template will be in the disk image and it'll be great for you to try it out so let's go back to the slides and continue on so that was the j2me demo so one of the problems that people have run into is building J&I on Mac OS 10 isn't exactly straightforward let's talk a little bit about it it's actually easy once you know how when you're building a mid P target you want the library to be Nate Ani target you want the library the executable the result to have the start with at lib and then end with the extension J and I live and so if say you want a deer to be able to do a system dot load library foo you would actually name your target Lib foo and then change the executable of the extension to PJ and I Lib and so the exit the j NR library would be Lib Fuji and I live so there's two steps to do this in Xcode the first step normally what I do is I split this into multiple targets the first step is actually to build the headers and that's where you call Java H with a shell script and then to build a J and I library and that's the second target and then of course you have your actual application target that I'm just focusing on the TI library at this point so the header target you add you create a new target a package target a jar Java package that's essentially to jar file add all your classes to it with the native methods and any supporting classes that you need to compile those typically you don't add all your classes because if you have 100 or so classes and you'll end up building all those classes many times you just want to include a subset and then add a shell script build phase to this target this is essentially what you would want to add as a shell script build phase we actually have J nice samples that includes this stuff so you don't have to write it down you can get it from our sample code website but essentially add the the the jar file to the class path and then job H will if you pass into all the class names with the native methods it'll generate all the header files for you the next start step is the j'ni library target this is a BSD dynamic library of course named Lib and then whatever the extension the library that you actually want to have loaded with system that load library you change the extension to J&I lib this is actually a build option you set the the native build option for wrapper under sort extension to j'ni lib you do this with the custom options the build options and this will actually give you a J&I lib extension versus a dilated extension and of course you can build C C++ objective-c anything you want into that j'ni library just expose you know C entry points because that's what J&I expects so Jan once you get your j'ni library built the next step is actually deploying it or or copying into your application or something like that of course like I said before the copy files build phase that is the one where you copy the J&I library into your java application bundle and actually if i use in the copy files build phase there's a pop-up that you can select where in the application bundle and you would want to use the job of resources we add that to the dialogue search path for J and I the Java Web Start you would actually want to copy that file or you would want to add that file to to the Web Start project and so that will include the jar and are the JI library in your jar and so when you download the Java Web Start it'll actually application it'll be able to find that jar for you and of course talking about J&I libraries there's a few more places that you can actually install them on the system besides the application bundle of course anywhere in the job search path we look for them additionally we look in the the library Java extensions at the root of the system so if you want to install a Jane in our library for the entire system that's the place to put it or if you want to install a J&I library just for the specific user that's currently running you can install it in the same directory structure but in their home directory and we'll look there for it also so just a quick note while we're talking about java J&I there's a few things to be aware of some of the threading between Java and our GUI is a cocoa GUI and what happens is when you're running a cocoa application it actually the the app kit thread is thread 0 and that is the one that is actually receiving all the cocoa events and stuff like that you don't want to block that and then of course you don't want to block the java.awt thread so when calling between say cocoa and Java there's a couple things that you want may want to use is in the when you call an objective-c from the Java side of it you may want to use perform selector on main thread and what that'll do is allow you to dispatch an event to the objective-c app kit thread and then be able to let your aw t thread return say if it was in responsive Benton click or Mouse down or something like that if you wait until done you'll actually end up blocking that thread so that may be something you may not want to do and then when you're calling back in the Java from cocoa you want to avoid running Java on the App kit so to do that you'd actually use swings and Vulcan weight and book later or something like that or actually invoke and weight and Vulcan weight is kind of like the wait until done in that you might end up paying the app kit thread so be very cautious if you use that I should probably have had this build on to put a couple X's on those but um specifically if say you're using JWT oracle key component JWT paints on the AWT dispatch thread so if you're calling out to a native coco function or something like that don't block that AWT thread because your application will sit there and won't be responsive and tell like it comes back from the cocoa app kit and then in cocoa component it paints on the the main cocoa thread if you block that then all of a sudden you won't be getting any event sent to your a w t from cocoa so don't block that thread so let me bring up Greg Boyle singer we're gonna talk about debugging in Xcode and yeah I'm going to show you a little bit a bit about debugging in Xcode and another little thing about 1/5 I think it's pretty funny the way that we have Java 1/5 which son calls tiger and our OS is called Tiger usually from us you'll never hear us call Java 1/5 tiger because it's confusing for us too so first off I'm going to show you how to debug a Java applet in Safari I had told I believe it was Ted that I could do this and he said I didn't even know that so we thought it would be a good demo to have here so I'm using Tiger here I'm going to create a swing I'm sorry the tiger demo machine demo one thank you so I'm just gonna create this little example on the desktop what we have here is just a standard really simple swing application swing an applet I'm sorry and what you can do is create a custom executable like Ted had mentioned earlier you go to the project menu you create a custom executable we're gonna call it Safari choose it from the chooser and when you edit the custom executable here you'll see that the executable path is application Safari and to debug it you'd pick the Java debugger here this will launch Safari using Xcode and hit our breakpoint this morning and I didn't want to tempt the demo gods I was thinking that other applications that do run Java using WebKit could also be debug the same way but I didn't want to try any of those other WebKit applications right now so start it up Safari using Xcode I've set a breakpoint in the paint method here and I'm going to open the HTML file for my applet it's going to load the applet and now it hit the breakpoint you can see with standard Java debugging you get to see your thread stack here arguments you couldn't examine these items here you can step through code wires step over sorry that was bye-bye code and then you could just let it continue and then there's your whoops there's your Java applet in Safari oh oh oh I got a repaint that's why doesn't that make sense and so so you can debug Java applets in Safari if you deploy your apples that way another handy tool that some people may not be totally aware of is the Java plug-in for debugging it's really useful when I'm debugging the actual Java plug-in I use the Java plug-in control panel a lot as well as Java debugging and you can even debug the native AWT code in Safari but you could pass all sorts of interesting things to the to the runtime when it's invoked using the Java Runtime parameters here you can set the boot class path that's what I do because I'm always replacing a WT or the plug-in so you would apply it and then the next time you run Safari and you open that applet that I just ran you'll see that what we ran it from you couldn't see the console if I just run it from the command line of course so here you could see that the output you get to see where all your classes are loaded from so I find it particularly useful when I'm debugging if I have got my boot class path setup wrong I use the verbose but verbose class loader option for the Java plug-in there so what I'm going to go to now is the slides so like I showed you just now that you have the you select the Java debugger in your custom executable and you'd select Safari there and if you need to you can just bug both Java and J&I code simultaneously outside of Safari because Jay and I cannot run in of applet without certain security issues typically you'd use the Java debugger in Xcode and then you could attach to that process from the command line with gdb and see your stack there alternately you could probably do it the other way around if you launched your applications such that it could be debugged with jdb I did the demo before the slides so now I'm gonna talk about how you can use the java 1 5 preview in xcode xcode is an amazing tool because it has so many options they they're they it's amazing what it can do because without even knowing about java 1/5 it can both build it and run it and that's very useful so some things to know about java 1/5 it's a preview it's not all complete yet so in tiger it's only in tiger and in Tiger 142 is still the default Java you can only run it from the command line we didn't set it up so that double clickable dot apps work even double click little jars don't do anything for 1/5 so what you have to do is use the full version path in the terminal our Java is set up so that we could have multiple Java's installed at once it's system library frameworks Java VM frameworks versions 1.5 commands and then Java and all the other regular tools are there - such as Java H Java C and jar other all those other types of tools are there and the new ones pack 200 and I'm not sure of the other ones right off the top of my head right now you can only debug Java with the jdb command-line tool for 1/5 in tiger we don't have the debugger set up inside of xcode yet it's a problem in the jdk not in xcode and AWT inswing are present in one-five bill but if you try to run any you'll find you'll quickly crash in some kind of font code so unfortunately that's not yet ready for the preview but we'll have it soon so now I'm gonna show you how to do how to use one five in Xcode go back to Xcode over here close up that project I had going any more I mean we're going to use the new ant templates available in Xcode there's no ant templates for applets yet so that's why I wasn't able to I wasn't able to show the swing applet in ant so we're gonna call this one Java one five so these are in the release notes for one five but the way to get one five to compile using ant first off we have to get it to compile using it and we use here we use four equals true so this is going to fork the Java C off into a new process and this is where you're going to give the path to the executable ant would seem to be versatile enough that you can also use any version of Java that you may have laying around oops well so much for yeah I don't know so I have to type in the full path what I've done and what if you do one five development in the preview what you'll want to do is certainly make a command-line shortcut an alias and your terminal to this command because it's quite long to type in all the time especially without code without the command line completion so you would type in the full path to the executable and the build.xml now thank you thank you again so right now this source here is a very simple hello world program and so I made a very complicated one I don't know why this works Oh actually it's already in my clipboard isn't it I made a very complicated one five only hello world we're using the generic string ArrayList to add hello world here and we're using the for loop here I don't know what they enhanced for-loop is what I believe they call it and this is just to show you that I'm going to be able to build using one five and Xcode because this will not build this sample here will not build in one four because of the generics and the odd for loop choose build we are not having luck with the demos today thank you again so now we'll see that the build has succeeded beyond all our beliefs what we'll make now is a new custom executable so this is how we will be able to run one 5in in Xcode so it because it has all these custom executables and you could set the variable names you can even run build one five with jam if you'd like to so once again I have to type in that path because I can't figure out how to get see the clipboard does work in Tiger so now we're gonna run it using one five in Xcode and it's a terribly exciting one that says thank you what was that class called I'm terribly sorry about that I should have remembered that now you'll see that we have yet another problem I did this this morning well we always have my favorite thing so we built this job this class file here using Xcode and now I ran that 1/5 program using 1/5 so you can see that X codes very versatile it can do all these things I don't know why I wasn't able to get it to run using Xcode today because I did it this morning so I think that now we're going to bring Ted back on up to on stage thank you great so in theory what we showed you is how Xcode can help you with your Java development on Mac os10 we've gone into things that we've talked about the ant that's coming with the 1.5 in the 2.0 we've talked about some of the things like not quite cross compiling but targeting other platforms say j2me ant is very useful for that we talked about the application server update and the one for to update for the current Panther install with this I think we've gotten that you guys enough information get you started probably enough to get you up and running and asking questions be sure to use some of these things one thing that we don't have up there that's actually a very useful resource is the Java developers mailing list if you go to list a pecan join the Java - dev mailing list this is an extremely active mailing list you're going to want to set up a filter to put it into a folder for you otherwise it's going to fill up your inbox rather quickly but it nice thing about it is you can ask pretty much any question on there and there's usually somebody up around the world who will be able to answer it without too much too long and occasionally the job engineer is actually when they have time we'll work on the list and you'll get the information directly from the source so with that we move on to the Q&A thing to it yeah definitely the mid P stuff there's an article on Sons website about doing mid P development on Mac os10 check that out it goes into a lot of details from the command line and now Q&A