• Get current running class dir path

String jarOrBuildClassDir = getClass().getProtectionDomain().getCodeSource().getLocation().getPath();

It will return 'build/classes/main' if you run it on IDE

/Users/demo/workspace/MyDemo/build/classes/main/

It will return the location of 'jar' file which the class archived if you run it in a jar file

/Users/demo/workspace/MyDemo/install/MyDemo/lib/MyDemo.jar

• Get special resources file path that copy from 'src/main/java/resources/com/demo/test.xsl'

URL xslFileURL = getClass().getResource("/com/demo/test.xsl")

It will return 'build/resources/main' if you run it on IDE

/Users/demo/workspace/MyDemo/build/resources/main/com/demo/test.xsl

It will return the location of 'jar' file which the class archived if you run it in a jar file

file:/Users/demo/workspace/MyDemo/install/MyDemo/lib/MyDemo.jar!/com/demo/test.xsl