Description
The .classpath file for the core module contains a classpath entry for <ACTIVEMQ_HOME>/src/class (absolute path), whereas the correct path would be <ACTIVEMQ_HOME>/modules/core/src/conf (absolute path) or just src/conf (rel. path).
The fix is as easy as adding ${basedir} in /modules/core/project.properties line 10:
maven.eclipse.classpath.include=${basedir}/src/conf