.classpath xml中的环境变量

Question

I've this line in .classpath file in Eclipse (Dynamic Web Project). I got this by adding an external jar from "build path" option.

<classpathentry kind="lib" path="D:/apache-tomcat-7.0.55/lib/some.jar" sourcepath="/Scrubber"/>

But I already have CATALINA_HOME set in my system. I want to replace path="D:/apache-tomcat-7.0.55/lib/some.jar" to path="[CATALINA_HOME]/lib/some.jar"

What is the correct syntax for it. I tried

path="${CATALINA_HOME}/lib/some.jar"

path="${env:CATALINA_HOME}/lib/some.jar"

path="${env.CATALINA_HOME}/lib/some.jar"

path="${catalina.home}/lib/some.jar"

path="${catalina.base}/lib/some.jar"

None of them worked for me.

Answer 1

The class path entry will not resolve environment variables so this won't work.

The closest you can get is to use the Eclipse Preferences 'Java > Build Path > Classpath Variables' to define a similar CATALINA_HOME variable inside Eclipse.

Once you have the Eclipe Classpath Variable defines you can use the 'Add Variable...' button on the 'Java Build Path' property page in the 'Libraries' section.

This will give you a class path entry looking like:

<classpathentry kind="var" path="CATALINA_HOME/lib/some.jar"/>

note that the 'kind' is 'var' rather than 'lib'.

Answer 2

You either need to set a global variable on Eclipse level or on project level. Learn how to do it in Eclipse docs. Basically you need to go to Run -> Run Configurations... and Select tab "Environment".The relevant article is here .

To use your variable: (based on a system environment variable) select Add variable string, in .classpath type: ${env_var:your-environment-variable-name}/path-to-jar . For example, if your system environment variable is MYVAR and the JAR file is under subdir/myfile.jar, you should type ${env_var:MYVAR}/subdir/myfile.jar .