Classpath woes

[stormbind]

Hi all (

I have a classpath problem after changing computers, and the workaround must be ok on future changes too (pc & mac, without admin rights).

/desktop/a/b/*.class
/desktop/c/*.class
/desktop/d/*.class
/desktop/e/f/main.class

Tried javac from root: javac /e/f/main.class (cannot find /c/*.class)

PC accepted the following, but it isn't working on current Mac.

/desktop/a/b/*.class
/desktop/c/*.class
/desktop/d/*.class
/desktop/main.class

I'm in trouble if this isn't fixed pronto!

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[stormbind]

I forgot to say that each computer they stick me with has different classpath settings. This is something that just has to be accepted and worked with.

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[Diancecht]

javac is for compiling, not for executing.

Appart from that, which is your actual classpath?

Cheers,
Dian

 

[stormbind]

I do not know how to answer your question. Is the answer written somewhere in the system?

The following is now working on the Mac

/desktop/a/b/*.class
/desktop/c/*.class
/desktop/d/*.class
/desktop/main.class

Meaning, I type this in the console:
cd desktop
javac main.java (finds all required packages)
java main (whoohoo!!)

However, this is not ideal because a collection of 'mains' will be used for a technical demonstration and having them all on the desktop would be messy. That's why I wanted the individual apps in /desktop/e/f/main.class where /f/ is unique.

So what I think I'd like is to compile in desktop/e/f/ using packages found in desktop/ and this works, but it won't execute (which I think is what you're referring to)

Do I need to define the classpath when executing, and how would I do that? Thank you!!

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[MoreFeo]

Tried with javac -cp . and then java -cp . ?

 

[stefanwagner]

To show the classpath on the PC:

echo $CLASSPATH

Use jars if your program consists of more than one class.

What ist that:

/desktop/a/b/*.class
/desktop/c/*.class
/desktop/d/*.class
/desktop/main.class

Not a CLASSPATH, but ...?

don't visit my homepage:

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

 

[stormbind]

Oh, I was looking for this thread :$

I have tried with -cp and just posted in another thread (sorry). It compiles (javac) and does not run (java).

The quoted lines show the relationship between my files.

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[stormbind]

I thought jar files were for packaging a working application, not for fixing one that won't run?

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[stormbind]

I just tried with -classpath a:a/b:a/d etc.

javac -classpath worked, and java -classpath failed (wrong name)

I'm sure javac worked because there were no errors and the class files were updated.

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[MoreFeo]

Try javac -classpath and java -cp

 

[Diancecht]

I can assure java -classpath exists.

Cheers,
Dian

 

[stormbind]

Still no change. Compiling appears to work and executing does not (using identical args). MoreFeo, I tried that too - it gives the same result.

Recap:

javac is creating files
java is giving me "NoClassDefFoundError" (wrong name)


--Glen

Memoria mihi benigna erit qui eam perscribam

 

[stormbind]

From sun..

The searched-for class definition existed when the currently executing class was compiled, but the definition can no longer be found.

 

[stormbind]

Oooo... well this works for the javac/java

// javac DIR/littledir/app.java -classpath DIR -d DIR/littledir
// java -classpath DIRIR/littledir app

However, using this, app expects to find all its data files in root/ instead of root/DIR/littledir *i hate compooters*

So back with the Java language, can I query the current working directory in my code?

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[stefanwagner]

What do you mean 'query the CWD'?
The CWD is "./" allways.


don't visit my homepage:

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

 

[Diancecht]

Not always, I think he's looking for something like

File f = new File(".");
System.out.println(f.getAbsolutePath());

Cheers,
Dian

 

[stefanwagner]

Not always?
In which case not?

don't visit my homepage:

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

 

[MoreFeo]

Don't know if you still have the problem, but how are you executing java?

It should be "javac -classpath . a/b/c/*.class" and then "java -cp . a.b.c.Main" or "java -classpath . a.b.c.Main" (no more slashes, replace them with dots)