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java.lang.NullPointerException: 	at javax.persistence.Persistence$1.isLoaded(Persistence.java:78)	at org.hibernate.validator.engine.resolver.JPATraversableResolver.isReachable(JPATraversableResolver.java:62)	at org.hibernate.validator.engine.resolver.DefaultTraversableResolver.isReachable(DefaultTraversableResolver.java:94)	at org.hibernate.validator.engine.resolver.SingleThreadCachedTraversableResolver.isReachable(SingleThreadCachedTraversableResolver.java:47)	at org.hibernate.validator.engine.ValidatorImpl.isValidationRequired(ValidatorImpl.java:757)	at org.hibernate.validator.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:324)	at org.hibernate.validator.engine.ValidatorImpl.validateConstraintsForRedefinedDefaultGroup(ValidatorImpl.java:273)	at org.hibernate.validator.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:256)	at org.hibernate.validator.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:210)	at org.hibernate.validator.engine.ValidatorImpl.validate(ValidatorImpl.java:119)	at Foo.main(Foo.java:23)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:616)	at org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:217)	at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:152)	at org.apache.tools.ant.taskdefs.Java.run(Java.java:764)	at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:218)	at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:132)	at org.apache.tools.ant.taskdefs.Java.execute(Java.java:105)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:616)	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)	at org.apache.tools.ant.Task.perform(Task.java:348)	at org.apache.tools.ant.Target.execute(Target.java:357)	at org.apache.tools.ant.Target.performTasks(Target.java:385)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)	at org.apache.tools.ant.Project.executeTarget(Project.java:1306)	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)	at org.apache.tools.ant.Project.executeTargets(Project.java:1189)	at org.apache.tools.ant.Main.runBuild(Main.java:758)	at org.apache.tools.ant.Main.startAnt(Main.java:217)	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)