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java.lang.NullPointerException: null at org.hibernate.engine.internal.StatefulPersistenceContext.clear(StatefulPersistenceContext.java:235)[hibernate-core-5.1.0.Final.jar:5.1.0.Final] at org.hibernate.internal.SessionImpl.internalClear(SessionImpl.java:395)[hibernate-core-5.1.0.Final.jar:5.1.0.Final] at org.hibernate.internal.SessionImpl.clear(SessionImpl.java:391)[hibernate-core-5.1.0.Final.jar:5.1.0.Final] at com.ric.bill.ChrgServ.save(ChrgServ.java:227)[classes/:na] at com.ric.bill.ChrgServ$$FastClassBySpringCGLIB$$67dcba28.invoke(<generated>)[classes/:na] at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)[spring-core-4.3.2.RELEASE.jar:4.3.2.RELEASE] at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720)[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE] at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)[spring-tx-4.2.5.RELEASE.jar:4.2.5.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE] at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655)[spring-aop-4.3.2.RELEASE.jar:4.3.2.RELEASE] at com.ric.bill.ChrgServ$$EnhancerBySpringCGLIB$$b101e62c.save(<generated>)[classes/:na] at com.ric.bill.BillServ.chrgHouse(BillServ.java:121)[classes/:na] at com.ric.bill.BillServ.chrgAll(BillServ.java:88)[classes/:na] at com.ric.web.GreetingController.greeting(GreetingController.java:81)[classes/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[na:1.8.0_60] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[na:1.8.0_60] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[na:1.8.0_60] at java.lang.reflect.Method.invoke(Method.java:497)[na:1.8.0_60]