The JavaEEModuleInformer specifies this requirement for getModulePath():

/**

• Obtain the relative path of the deployment unit within the JavaEE application
• or base deployment directory.
• The deployment unit is either a JavaEE module or a component of the JavaEE module.
• If the JavaEE module is part of a JavaEE application return the relative
• path within the JavaEE application otherwise it is considered a stand alone deployment
• and return the relative path within the base deployment directory.
• Note that the relative path includes the module name, for example 'lib/bar.jar'.
• @param deployment the deployment unit of the module or a component
• @return the relative path of the JavaEE module
  */
  String getModulePath(DeploymentUnit deploymentUnit);

However the current implementation in SimpleJavaEEModuleInformer has this:

public String getModulePath(DeploymentUnit unit)

This incorrectly returns an empty string for a toplevel non-ear deployment (for ex: a standalone .war deployment).