NCDFE thrown on OSX when there is a .properties and .class of the same case-insensitive spelling but different name.

Java 9-internal: Exception in thread "main" java.lang.NoClassDefFoundError: de/rgra/nl/Messages (wrong name: de/rgra/nl/messages)
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:986)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1065)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:205)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:730)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassInModuleOrNull(BuiltinClassLoader.java:651)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClass(BuiltinClassLoader.java:532)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
at java.base/java.lang.Class.forName(Class.java:448)
at java.base/java.util.ResourceBundle$ResourceBundleProviderHelper.lambda$loadResourceBundle$1(ResourceBundle.java:3567)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:428)
at java.base/java.util.ResourceBundle$ResourceBundleProviderHelper.loadResourceBundle(ResourceBundle.java:3568)
at java.base/java.util.ResourceBundle.loadBundle(ResourceBundle.java:1824)
at java.base/java.util.ResourceBundle.findBundle(ResourceBundle.java:1754)
at java.base/java.util.ResourceBundle.findBundle(ResourceBundle.java:1708)
at java.base/java.util.ResourceBundle.findBundle(ResourceBundle.java:1708)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1642)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1562)
at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1536)
at java.base/java.util.ResourceBundle.getBundle(ResourceBundle.java:837)
at resourcebundle/de.rgra.nl.Messages.main(Messages.java:13)

See http://mail.openjdk.java.net/pipermail/jigsaw-dev/2017-April/011952.html