"org.datanucleus" is already registered under Spring Source Toosuite

Exception in thread "main" Plugin (Bundle) "org.datanucleus" is already registered. Ensure you dont have multiple JAR versions of the same plugin in the classpath. The URL "file:/home/zakaria/.m2/repository/org/datanucleus/datanucleus-core/1.1.6/datanucleus-core-1.1.6.jar" is already registered, and you are trying to register an identical plugin located at URL "file:/home/zakaria/springsource/sts-2.3.3.M2/plugins/com.google.appengine.e开发者_如何学Pythonclipse.sdkbundle.1.3.5_1.3.5.v201007021040/appengine-java-sdk-1.3.5/lib/user/orm/datanucleus-core-1.1.5.jar." org.datanucleus.exceptions.NucleusException: Plugin (Bundle) "org.datanucleus" is already registered. Ensure you dont have multiple JAR versions of the same plugin in the classpath. The URL "file:/home/zakaria/.m2/repository/org/datanucleus/datanucleus-core/1.1.6/datanucleus-core-1.1.6.jar" is already registered, and you are trying to register an identical plugin located at URL "file:/home/zakaria/springsource/sts-2.3.3.M2/plugins/com.google.appengine.eclipse.sdkbundle.1.3.5_1.3.5.v201007021040/appengine-java-sdk-1.3.5/lib/user/orm/datanucleus-core-1.1.5.jar." at org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:434) at org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:340) at org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensions(NonManagedPluginRegistry.java:222) at org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensionPoints(NonManagedPluginRegistry.java:153) at org.datanucleus.plugin.PluginManager.registerExtensionPoints(PluginManager.java:82) at org.datanucleus.OMFContext.(OMFContext.java:160) at org.datanucleus.enhancer.DataNucleusEnhancer.(DataNucleusEnhancer.java:172) at org.datanucleus.enhancer.DataNucleusEnhancer.(DataNucleusEnhancer.java:150) at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1157)

Can you help me please? I tried to re-enter the following command in the built-in Roo Shell but no way:

persistence setup --provider DATANUCLEUS --database HYPERSONIC_IN_MEMORY 

Thanks,

Regards.

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As the message says, you have two "datanucleus-core" jars in the CLASSPATH, so check your CLASSPATH