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java.util.ConcurrentModificationException: 	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:448)	at java.util.AbstractList$Itr.next(AbstractList.java:419)	at java.util.Collections$1.next(Collections.java:996)	at org.springframework.transaction.support.AbstractPlatformTransactionManager.triggerBeforeCommit(AbstractPlatformTransactionManager.java:434)	at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:311)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:211)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:138)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:148)	at $Proxy43.setCV(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at org.springframework.aop.framework.AopProxyUtils.invokeJoinpointUsingReflection(AopProxyUtils.java:59)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:138)	at $Proxy43.setCV(Unknown Source)	at com.cashu.sample.test.UserDAOTest.testUserCV(UserDAOTest.java:73)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:324)	at junit.framework.TestCase.runTest(TestCase.java:154)	at junit.framework.TestCase.runBare(TestCase.java:127)	at org.apache.cactus.internal.AbstractCactusTestCase.runBareServer(AbstractCactusTestCase.java:149)	at org.apache.cactus.internal.server.AbstractWebTestCaller.doTest(AbstractWebTestCaller.java:119)	at org.apache.cactus.internal.server.AbstractWebTestController.handleRequest_aroundBody0(AbstractWebTestController.java:93)	at org.apache.cactus.internal.server.AbstractWebTestController.handleRequest_aroundBody1$advice(AbstractWebTestController.java:124)	at org.apache.cactus.internal.server.AbstractWebTestController.handleRequest(AbstractWebTestController.java)	at org.apache.cactus.server.ServletTestRedirector.doPost_aroundBody2(ServletTestRedirector.java:101)	at org.apache.cactus.server.ServletTestRedirector.doPost_aroundBody3$advice(ServletTestRedirector.java:124)	at org.apache.cactus.server.ServletTestRedirector.doPost(ServletTestRedirector.java)	at org.apache.cactus.server.ServletTestRedirector.doGet_aroundBody0(ServletTestRedirector.java:72)	at org.apache.cactus.server.ServletTestRedirector.doGet_aroundBody1$advice(ServletTestRedirector.java:124)	at org.apache.cactus.server.ServletTestRedirector.doGet(ServletTestRedirector.java)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:72)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)	at org.jboss.web.tomcat.security.JBossSecurityMgrRealm.invoke(JBossSecurityMgrRealm.java:275)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)	at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)	at java.lang.Thread.run(Thread.java:534)