java.lang.IllegalAccessError: org.apache.commons.dbcp.DelegatingPreparedStatement.isClosed()Z

做spring和mybaits整合时出现的错误，让这个问题困扰了一早上，通过查资料终于把这个问题解决了

具体问题描述：

 java.lang.IllegalAccessError: org.apache.commons.dbcp.DelegatingPreparedStatement.isClosed()Z

     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:498)
     at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:78)
     at com.sun.proxy.$Proxy14.isClosed(Unknown Source)
     at org.apache.ibatis.executor.BaseExecutor.closeStatement(BaseExecutor.java:285)
     at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:65)
     at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)
     at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
     at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
     at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
     at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
     at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
     at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     at java.lang.reflect.Method.invoke(Method.java:498)
     at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
     at com.sun.proxy.$Proxy11.selectOne(Unknown Source)
     at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:166)
     at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:83)
     at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
     at com.sun.proxy.$Proxy12.queryUserById(Unknown Source)
     at com.shen.test.testMybaits.test1(testMybaits.java:16)
     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:498)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
     at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
     at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
     at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
     at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
     at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

问题的大概意思是：

简单来说就是mybatis出现了问题，而问题关键在于mybatis.jar包版本不符，试着用老一点的版本就可以运行了。对于这种问题得多看看jar包的官方文档

解决的方法：

把mybatis的jar的版本将低点