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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(LogFactoryImpl.java:385)	at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)	at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)	at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)	at org.hibernate.tool.hbm2ddl.SchemaExport.(SchemaExport.java:35)	at org.hibernate.tool.ant.Hbm2DDLGeneratorTask.execute(Hbm2DDLGeneratorTask.java:38)	at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:115)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.Target.execute(Target.java:341)	at org.apache.tools.ant.Target.performTasks(Target.java:369)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)	at org.apache.tools.ant.Project.executeTarget(Project.java:1185)	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)	at org.apache.tools.ant.Project.executeTargets(Project.java:1068)	at org.apache.tools.ant.Main.runBuild(Main.java:668)	at org.apache.tools.ant.Main.startAnt(Main.java:187)	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)