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This exception has no message.
java.lang.NullPointerException: 	at org.jboss.mx.loading.RepositoryClassLoader.findClass(RepositoryClassLoader.java:620)	at java.lang.ClassLoader.loadClass(ClassLoader.java:289)	at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:464)	at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:405)	at java.lang.ClassLoader.loadClass(ClassLoader.java:235)	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)	at com.mysql.jdbc.PreparedStatement.(PreparedStatement.java:147)	at com.mysql.jdbc.Connection.prepareStatement(Connection.java:1283)	at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.doPrepareStatement(BaseWrapperManagedConnection.java:349)	at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.prepareStatement(BaseWrapperManagedConnection.java:344)	at org.jboss.resource.adapter.jdbc.WrappedConnection.prepareStatement(WrappedConnection.java:187)	at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:497)	at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:415)	at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:139)	at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1561)	at org.hibernate.loader.Loader.doQuery(Loader.java:661)	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)	at org.hibernate.loader.Loader.doList(Loader.java:2145)	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)	at org.hibernate.loader.Loader.list(Loader.java:2024)	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:392)	at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:333)	at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1114)	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)