06-09-2003 06:19									#1
	Help! My computer refuses to amend the java path. Increase Your PM Length

Every time I try, it pretends that it has saved the changes, but it really hasn't. If I close the command prompt and open it again, I get the original path. This happened even when I tried overwriting the path rather than appending it. It is almost like something is always rewriting the path, no matter what I do. Needless to say, I can't run any java classes from batch files or the command prompt until this is fixed. Does anyone know what to do here? Thanks.

Attachment: java-mess.jpg
This has been downloaded 46 time(s).

	06-09-2003 07:27									#2
	Increase Your PM Length

Can't you use JBuilder (or whatever) to chage the path?

	06-09-2003 07:35									#3
	Put an end to popups!

quote: Originally posted by reds4ever Can't you use JBuilder (or whatever) to chage the path?

EDIT: sorry, drunk and didn't read the question properly

	06-09-2003 07:44									#4
	Enter the AD-FREE zone

In XP:

System Properties > Advanced > Environment Variables > System > Path > Edit

I recommend doing the actual editing in a text editor because the text box is tiny.

Yes, I do think they made it this difficult to find just to spite Java. This was much, much easier before XP.

	06-09-2003 07:44									#5
	Support Apolyton buy from Amazon

I haven't counted, but perhaps your path is too long? IIRC, you can only have 128 characters worth of path stored.

You can also change the path in your autoexec with msconfig.

	06-09-2003 20:30									#6
	Support Apolyton buy from Amazon

Thanks guys. I wiped out a couple of the Oracle paths and it saved the new path. Unfortunately, that did not solve the central problem. While I can run things through an IDE, I still cannot run anything from the command prompt or a batch file. It gives me the same error as before. I made sure that the path is right, and I can't figure out what else it might be.

Attachment: still busted.jpg
This has been downloaded 32 time(s).

	06-09-2003 20:39									#7
	Support Apolyton buy from Amazon

Maybe you need to set something else in the path?

	06-09-2003 20:43									#8
	Support Apolyton, buy Galactic Civilizations

There is a java.exe program in the C:\j2sdk1.4.2_01\bin folder. I got all of this to work in about 15 minutes in the computer lab, and we had to set the path manually on those computers too. What else might I need to put in the path?

	06-09-2003 20:47									#9
	Got spare money?

Do you need to specify an extension? Would it assume a ".class" extension if you supply none?

	06-09-2003 23:00									#10
	Support Apolyton, buy Civilization: The Boardgame

The java command interprets any period as a command to look in a subfolder. Asking to run "Psychiatrist.class" made it look for a class named "class" in a "Psychiatrist" folder. In all the labs and batch files I've seen, the .class extension is never typed.

	07-09-2003 16:38									#11
	Support Apolyton, buy Alpha Centauri

Found this on Sun's Java website

quote: Error Explanation Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp If you receive this error, java cannot find your bytecode file, HelloWorldApp.class. One of the places java tries to find your bytecode file is your current directory. So, if your bytecode file is in C:\java, you should change your current directory to that. To change your directory, type the following command at the prompt and press Enter: cd c:\java The prompt should change to C:\java>. If you enter dir at the prompt, you should see your .java and .class files. Now enter java HelloWorldApp again. If you still have problems, you might have to change your CLASSPATH variable. To see if this is necessary, try "clobbering" the classpath with the following command: set CLASSPATH= Now enter java HelloWorldApp again. If the program works now, you'll have to change your CLASSPATH variable.

	07-09-2003 21:21									#12
	Enter the AD-FREE zone

Clobbering the classpath worked. I changed it permanently in the Control panel, and now everything works right. I have no clue how the classpath got changed before. Thanks.

	08-09-2003 20:52									#14
	Oracle Support Apolyton, buy Alpha Centauri

I noticed you had Oracle installed. The Oracle installer changes the Classpath. It thinks that Oracle Java is the version you want to run and overrides whatever is there.