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java.lang.NullPointerException: null	at org.hibernate.engine.internal.StatefulPersistenceContext.clear(StatefulPersistenceContext.java:235)	at org.hibernate.internal.SessionImpl.internalClear(SessionImpl.java:395)	at org.hibernate.internal.SessionImpl.clear(SessionImpl.java:391)	at com.ric.bill.ChrgServ.save(ChrgServ.java:227)	at com.ric.bill.ChrgServ$$FastClassBySpringCGLIB$$67dcba28.invoke()	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655)	at com.ric.bill.ChrgServ$$EnhancerBySpringCGLIB$$b101e62c.save()	at com.ric.bill.BillServ.chrgHouse(BillServ.java:121)	at com.ric.bill.BillServ.chrgAll(BillServ.java:88)	at com.ric.web.GreetingController.greeting(GreetingController.java:81)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)