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NetBeans & Classpath issue

Posted on 2004-10-20
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Last Modified: 2013-11-23
Hello everyone, quick question concerning NetBeans and my classpath settings.

For my development machine, I have the following setup:  

Classpath = D:\classpath
JAVA_HOME = c:\j2skd1.4.2_05\bin

Now, I archive all java jars into a seperate folder just for archival purposes and I keep only those jars which I'm either currently using or use frequently in my classpath.  In NetBeans, if I import from a library, it will sometimes show that it does not exist...although the proper jar file is in the classpath. I have even gone as far as unzipping the jar file and then building the directory structure itself within the classpath just to ensure that it is there.  Now, if I mount the jarfile within NetBeans, then the code will compile as NetBeans is able to find the proper import files.

I'm really at a loss as why this is....I'm sure it must be a stupid mistake on my part.

Thanks,
David
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Question by:lomidien
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zzynx earned 250 total points
ID: 12358947
>> if I import from a library, it will sometimes show that it does not exist
In netBeans the corresponding jar must be mounted
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by:CEHJ
ID: 12358953
There's a contradiction here - you talk about jars, yet there are none in your classpath. A classpath involving jars must put the full path to the jar file
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by:zzynx
ID: 12358961
>> ...although the proper jar file is in the classpath.
netBeans doesn't use that one, only the mounted jar's
(That's my experience)
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by:zzynx
ID: 12359002
I quote:

Mounting filesystems not only defines the contents of a project, it also defines the Java classpath for the project. Unlike in command-line development, the IDE ignores the CLASSPATH variable on your system and builds a unique internal classpath for each of your projects. This classpath is made up of all the mounted filesystems, including hidden filesystems and filesystems that are mounted by default by the IDE.
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by:zzynx
ID: 12359021
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by:CEHJ
ID: 12359036
There are two parts to this:

1. Java won't use jars in the classpath unless the full path is used
2. No IDE that i know of will use a jar unless it's explictly added via the GUI. Sometimes is you put it in the ext directory it will pick it up anyway
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by:CEHJ
ID: 12359042
>>Sometimes is

=
Sometimes if
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by:lomidien
ID: 12359199
Thanks all.  Yeah, it has been my experience that they must be mounted....I just didn't think that it was necessarily so.  I thought perhaps I had a setting wrong or something else, but if they must be mounted, they must be mounted.

Thanks,
David
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by:CEHJ
ID: 12359251
They don't probably don't *have* to be mounted if you follow what i said earlier
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by:zzynx
ID: 12359252
Thanks for accepting.
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by:Giant2
ID: 12359281
> I archive all java jars into a seperate folder just for archival purposes and I keep only those jars which I'm either currently using or use frequently in my classpath.  In NetBeans, if I import from a library...

If you want to use jar you must mount this external jar.
Are you sure the jar is accessible from NetBeans (not exist some constraint, permission,etc. on te filesystem)?
If you declare the classpath out of the IDE, normally it's ignored.
If you have even now the problem, see the project properties. Maybe you have specified something in the classpath prop.

Bye, Giant.
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