BinaryGrailsPlugin fails during startup on weblogic 12.1.3

[yvesf]

I'm referring to this change: b0e5375

The value of isJar is calculated by testing baseResourceString startsWith jar:.
For unknown reasons on weblogic it starts with zip: instead. Then it fails in the next line in the call to IOUtils.findApplicationDirectoryFile instead of taking null for projectDirectory. This completely blocks launching a grails application from an ear file on weblogic.

Please check if you can use org.springframework.util.ResourceUtils#isJarURL(URL).
In spring3 this weblogic behaviour is documented javadoc, however this comment vanished somehow.

[graemerocher]

Thanks for the pull request!