How do I use environment variables in an Eclipse .classpath file?

Question

In Windows I have an environment variable EXTERNAL_LIB_ROOT that points to C:\Program Files\MyExternalLibRoot. On another machine, it may point to C:\ExternalLibs.

In an ant build.xml file I would use:

<pathelement location="${env.EXTERNAL_LIB_ROOT}/path/to/jar.jar"/>

How do I set up an Eclipse project .classpath file to use the EXTERNAL_LIB_ROOT environment variable? Is it possible to have Eclipse auto generate the build.xml file using the environment variable as above?

ewan.chalmers · Accepted Answer · 2011-10-13 12:27:03Z

4

Not an environment variable, but you can set up a Path Variable in Eclipse. Path variables are per-workspace. They are therefore a convenient way of sharing a common location among multiple projects within a workspace. I have used them to share a lib folder among projects.

To create a Path Variable (either for the first time, or to re-use an existing one in a project):

File / New / Folder
- Opens the New Folder dialog
Click on the Advanced button
Select the "Link to folder in the file system" check box
Click the Variables button
- Opens the Select Path Variable dialog
Select or create a Path Variable

In your case, create a variable called EXTERNAL_LIB_ROOT.

(BTW, rather than generating a build.xml from your .classpath, I would suggest instead creating .classpath and .project from your build.xml.)

answered Oct 13, 2011 at 12:27

ewan.chalmers

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Rebse · Accepted Answer · 2011-10-12 20:38:15Z

0

Maybe the Ant addon Ant4Eclipse will help you, see
http://www.ant4eclipse.org/userguide-jdt and jdtClassPathVariable

answered Oct 12, 2011 at 20:38

Rebse

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