[robotic]

Where do I put .jar files in OSX PB (with development tools installed) to be able to use them?

I'm in a first year computer science course, learning Java. We use a special class cs1.Keyboard to do input. I've downloaded the .jar file, but I don't know where on the hard drive to put them. I've tried several places (doing a search for .jar, and putting a copy wherever I find other .jar files, and other places as well)
My program compiles in PB, but when it runs, I get this error:

Application's main thread threw an exception:
java.lang.NoClassDefFoundError: cs1/Keyboard
at HelloPerson.main(HelloPerson.java:63)
at java.lang.reflect.Method.invoke(Native Method)
at com.apple.buckyball.app.CarbonLibApp$MainRunner.ru n(CarbonLibApp.java:117)
at java.lang.Thread.run(Thread.java:479)

The same source does compile on our NT computers in the lab.

I've looked through documentation, but haven't been able to find any info on this. Could someone help me?

Thanks,
robotic

[Mooseyard]

Put the .jar file in:
/System/Library/Frameworks/JavaVM.framework/Home/lib/ext/
You'll need root access to cp it there.

Alternatively, use the -classpath argument to javac and java to add the .jar file to the classpath when compiling/running.

[absmiths]

When using Project Builder to build java apps, you need to add jar/zip files to the compiler and interpreter classpath.

Go to Project -> Add Frameworks and select your jar files. You will notice that they get added to your project file frame. From now on, any code compiled or run in project builder will have these classes available.


One word of caution: NEVER place files in the lib/ext directory! That directory is specifically reserved for standard java extensions, such as JCE, JMS, etc. As a long time java programmer I can tell you that the classpath can be one of the most difficult features of the Java environment. It is better to manage the classpath manually using shell scripts, etc. Any jar files placed in lib/ext or any other *magical* location will eventually cause conflicts that will be extremely irritating.