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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)	at java.util.HashMap$ValueIterator.next(HashMap.java:822)	at org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor.createMetaModelClasses(JPAMetaModelEntityProcessor.java:153)	at org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor.process(JPAMetaModelEntityProcessor.java:133)	at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:625)	at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:554)	at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:699)	at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:981)	at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:727)	at com.sun.tools.javac.main.Main.compile(Main.java:353)	at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:115)	at org.bsc.maven.plugin.processor.AbstractAnnotationProcessorMojo.executeWithExceptionsHandled(AbstractAnnotationProcessorMojo.java:261)	at org.bsc.maven.plugin.processor.AbstractAnnotationProcessorMojo.execute(AbstractAnnotationProcessorMojo.java:129)	at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)