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org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy.  You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.	at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(	at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(	at org.apache.commons.logging.LogFactory.getLog(	at org.hibernate.tool.hbm2ddl.SchemaExport.(	at org.hibernate.tool.ant.Hbm2DDLGeneratorTask.execute(	at org.hibernate.tool.ant.HibernateToolTask.execute(	at	at	at	at	at	at	at	at	at	at	at	at