SSM之Mybatis框架报错：It was either not specified and/or could not be found for the javaType (xxx) :

org.apache.ibatis.exceptions.PersistenceException: 
### Error updating database.  Cause: java.lang.IllegalStateException: Type handler was null on parameter mapping for property '__frch_user_0.uClass'. It was either not specified and/or could not be found for the javaType (com.example.pojo.Class) : jdbcType (null) combination.
### The error may exist in com/example/dao/DynamicSqlDao.xml
### The error may involve com.example.dao.DynamicSqlDao.insertMoreByArray
### The error occurred while executing an update
### Cause: java.lang.IllegalStateException: Type handler was null on parameter mapping for property '__frch_user_0.uClass'. It was either not specified and/or could not be found for the javaType (com.example.pojo.Class) : jdbcType (null) combination.

    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:199)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:184)
    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:62)
    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:58)
    at com.sun.proxy.$Proxy4.insertMoreByArray(Unknown Source)
    at com.exmple.test.MainTest.testInsertMoreByArray(MainTest.java:100)
    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:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
Caused by: java.lang.IllegalStateException: Type handler was null on parameter mapping for property '__frch_user_0.uClass'. It was either not specified and/or could not be found for the javaType (com.example.pojo.Class) : jdbcType (null) combination.
    at org.apache.ibatis.mapping.ParameterMapping$Builder.validate(ParameterMapping.java:119)
    at org.apache.ibatis.mapping.ParameterMapping$Builder.build(ParameterMapping.java:104)
    at org.apache.ibatis.builder.SqlSourceBuilder$ParameterMappingTokenHandler.buildParameterMapping(SqlSourceBuilder.java:123)
    at org.apache.ibatis.builder.SqlSourceBuilder$ParameterMappingTokenHandler.handleToken(SqlSourceBuilder.java:67)
    at org.apache.ibatis.parsing.GenericTokenParser.parse(GenericTokenParser.java:78)
    at org.apache.ibatis.builder.SqlSourceBuilder.parse(SqlSourceBuilder.java:45)
    at org.apache.ibatis.scripting.xmltags.DynamicSqlSource.getBoundSql(DynamicSqlSource.java:42)
    at org.apache.ibatis.mapping.MappedStatement.getBoundSql(MappedStatement.java:297)
    at org.apache.ibatis.executor.statement.BaseStatementHandler.<init>(BaseStatementHandler.java:64)
    at org.apache.ibatis.executor.statement.PreparedStatementHandler.<init>(PreparedStatementHandler.java:41)
    at org.apache.ibatis.executor.statement.RoutingStatementHandler.<init>(RoutingStatementHandler.java:46)
    at org.apache.ibatis.session.Configuration.newStatementHandler(Configuration.java:576)
    at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:48)
    at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)
    at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:197)
    ... 27 more

Process finished with exit code -1
 

在使用foreach实现批量插入的时候 ，出现了上面的报错，

后来经过测试发现，将

 这条语句中的#{user.uClass}改为null便不再报错，

 然后测试又发现，user.uClass 本就为 null

将语句中的#{user.uClass}改为null 和 user.uClass本就为null，

然后再执行数据库批量插入操作，为什么结果会不同？？？

后来我查询数据库的时候发现，

t_user表里的最后一个字段为cid是个int类型，而不是sql语句中的 user.uclass（Class类）

虽然同为null，但类型不对应，故出现了下面的报错……

It was either not specified and/could not be found for the javaType (com.example.pojo.Class) : jdbcType (null) combination.

虽然改为null就可以解决问题，但里边的含义却不是那么简单……

最后

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