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org.apache.openjpa.persistence.PersistenceException: null	at org.apache.openejb.client.EJBInvocationHandler.convertException(	at org.apache.openejb.client.EJBObjectHandler._invoke(	at org.apache.openejb.client.EJBInvocationHandler.invoke(	at org.apache.openejb.client.proxy.Jdk13InvocationHandler.invoke(	at $Proxy0.testMaterialType(Unknown Source)	at