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- java.lang.IllegalStateException: You are trying to access file: persistence_1_0.xsd from the default package. Please see http://bits.netbeans.org/dev/javadoc/org-openide-modules/org/openide/modules/doc-files/classpath.html#default_package at org.netbeans.ProxyClassLoader.printDefaultPackageWarning(ProxyClassLoader.java:500)