What is classpath?

[porkymin]

Hi all,

I am a beginner in Java, but i am currently working on project on J2EE, stuffs like EJB, MDB, etc.
How can i help myself to learn concepts in Java fast so that i can work on J2EE? I don't even know what is a classpath, how do we set it and how application reads and interpret from it. On top of that, I would also like to find out how do we write build.xml file and compile.csh, can anyone kindly guide me?

Any kind help is greatly appreciated.

 

[Diancecht]

I will never understand how you can start the roof before the house.

You should first have a look at some tutorial to have an idea of what is going on. If not, you will learn how to change some files without really understanding why.

http://java.sun.com/docs/books/tutorial/

http://java.sun.com/j2ee/1.4/docs/tutorial/doc/

http://java.sun.com/j2se/1.4.2/docs/tooldocs/findingclasses.html

Cheers,
Dian

 

[sedj]

You are writing EJB, yet have no idea what a CLASSPATH is ?
How did you manage to get that job ? You must be living in fear !

--------------------------------------------------
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http://www.primrose.org.uk

 

[stefanwagner]

The classpath is a list of locations, where the JVM will search for classes (jars and directories).

You may set it in your ~/.profile.

Applications will search it themselves and not interpret.

You write a build.xml with your favorite editor. Details are found in an ant-howto.

I don't know anything about compile.csh.



seeking a job as java-programmer in Berlin:

http://home.arcor.de/hirnstrom/bewerbung

 

[porkymin]

Thanks to all for the advice.
Just to understand what is it meant by Application will search it themselves and not interpret them? It refers to classes in jars as declared in classpath?

 

[stefanwagner]

It refers to classes in jars and directories, as declared in the classpath.

If the classpath is
CLASSPATH=/mnt/foolib:/foo/foo.jar

Classes are searched in /mnt/foolib and in /foo/foo.jar.

If the classname is foobar.Bar (foobar beeing the packagename) a directory foobar is expected in /mnt/foolib or in /foo/foo.jar and the Bar.class is expected in that directory.
You may have more and longer class/package-names, and a longer classpath - but that's it.

seeking a job as java-programmer in Berlin:

http://home.arcor.de/hirnstrom/bewerbung