at org.apache.ibatis.cache.decorators.SerializedCache.serialize(SerializedCache.java:102)

at org.apache.ibatis.cache.decorators.SerializedCache.putObject(SerializedCache.java:56)

at org.apache.ibatis.cache.decorators.LoggingCache.putObject(LoggingCache.java:51)

at org.apache.ibatis.cache.decorators.SynchronizedCache.putObject(SynchronizedCache.java:45)

at org.apache.ibatis.cache.decorators.TransactionalCache$AddEntry.commit(TransactionalCache.java:117)

at org.apache.ibatis.cache.decorators.TransactionalCache.commit(TransactionalCache.java:90)

at org.apache.ibatis.cache.TransactionalCacheManager.commit(TransactionalCacheManager.java:44)

at org.apache.ibatis.executor.CachingExecutor.close(CachingExecutor.java:58)

at org.apache.ibatis.session.defaults.DefaultSqlSession.close(DefaultSqlSession.java:210)

at cn.itcast.mybatis.mapper.OrdersMapperCustomTest.testCache2(OrdersMapperCustomTest.java:157)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)

at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:69)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)

at org.junit.runners.ParentRunner.run(ParentRunner.java:292)

at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:89)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)

Caused by: java.io.NotSerializableException: cn.itcast.mybatis.po.UserCustom

at java.io.ObjectOutputStream.writeObject0(Unknown Source)

at java.io.ObjectOutputStream.writeObject(Unknown Source)

at java.util.ArrayList.writeObject(Unknown Source)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)

at java.io.ObjectOutputStream.writeSerialData(Unknown Source)

at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)

at java.io.ObjectOutputStream.writeObject0(Unknown Source)

at java.io.ObjectOutputStream.writeObject(Unknown Source)

at org.apache.ibatis.cache.decorators.SerializedCache.serialize(SerializedCache.java:97)

... 33 more

查找发现错误提示的UserCustom实体类中缺少java.io.Serializable接口；

具体理由可参考https://blog.csdn.net/tony_java_2017/article/details/84372036。