| I am getting this ERROR, when my code going to use Hibernate Transaction.Sometime this error not occurs, but sometimes it occurs, on refresh the page it again works ...
 donot understand whats going on ...
 
 
 ERROR JDBCTransaction:91 - JDBC begin failed
 com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
 
 The last packet successfully received from the server was 3,593,553 milliseconds ago.  The last packet sent successfully to the server was 24 milliseconds ago.
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
 at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
 at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
 at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
 at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3052)
 at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2938)
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3481)
 at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1959)
 at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2109)
 at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2637)
 at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:5029)
 at com.mchange.v2.c3p0.impl.NewProxyConnection.setAutoCommit(NewProxyConnection.java:881)
 at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:87)
 at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)
 at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:555)
 at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371)
 at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:335)
 at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
 at com.sun.proxy.$Proxy31.addOrderDetails(Unknown Source)
 at com.jc.tagged.controller.PaymentController.makePayment(PaymentController.java:96)
 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:601)
 at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)
 at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
 at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
 at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
 at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
 at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
 at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:311)
 at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:776)
 at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:705)
 at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:898)
 at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
 at java.lang.Thread.run(Thread.java:722)
 Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
 at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2497)
 at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2949)
 ... 52 more
 4137016 [TP-Processor7] ERROR org.hibernate.transaction.JDBCTransaction  - JDBC begin failed
 com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
 
 The last packet successfully received from the server was 3,593,553 milliseconds ago.  The last packet sent successfully to the server was 24 milliseconds ago.
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
 at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
 at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
 at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
 at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3052)
 at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2938)
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3481)
 at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1959)
 at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2109)
 at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2637)
 at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:5029)
 at com.mchange.v2.c3p0.impl.NewProxyConnection.setAutoCommit(NewProxyConnection.java:881)
 at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:87)
 at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)
 at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:555)
 at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371)
 at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:335)
 at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
 at com.sun.proxy.$Proxy31.addOrderDetails(Unknown Source)
 at com.jc.tagged.controller.PaymentController.makePayment(PaymentController.java:96)
 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:601)
 at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)
 at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
 at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
 at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
 at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
 at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
 at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:311)
 at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:776)
 at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:705)
 at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:898)
 at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
 at java.lang.Thread.run(Thread.java:722)
 Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
 at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2497)
 at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2949)
 ... 52 more
 
 
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