问题
I am developing a Plug-in for Lotus Notes (which is Eclipse 3.4) and need to rely on an external SDK/Connector for some Java dependencies and also Configuration files.
It seems that in order to function properly, a file from the Connector installation folder has to be in the classpath. Since I don't know where it's installed, I have to rely on an environment variable that is set during installation ("IBMCMROOT"), which contains the folder.
Is there any way to use Windows environment variables for the classpath definition of eclipse plug-ins? I've tried using variables in the manifest:
Bundle-ClassPath: external:$IBMCMROOT$/lib/cmb81.jar,
$IBMCMROOT$/lib/cmbsdk81.jar,
$IBMCMROOT$/lib/db2jcc.jar,
.,
$IBMCMROOT$/lib/guava-15.0.jar,
$IBMCMROOT$/lib/log4j-1.2.17.jar
This results in ClassNotFoundExceptions...
回答1:
No, Bundle-ClassPath is not used this way. It can only refer to paths within the bundle itself.
In order to load classes from an arbitrary external JAR file at an unknown location, you will need to use a URLClassLoader.
回答2:
external: is an Eclipse containerism. But I think you need to prefix each external jar with external:. Also, IBMCMROOT must be a system property (not an environment variable). For example, start java with -DIBMCMROOT=...
However, I would not do this. Instead, put these necessary jars on the classpath and configure the system bundle to export those package which you can then import from your bundles.
来源：https://stackoverflow.com/questions/19546611/eclipse-3-4-external-jars-with-environment-variables