mybatis。 java.lang.UnsupportedOperationException

为什么在这段代码中发生错误？我不明白，请帮助我。mybatis。 java.lang.UnsupportedOperationException

我测试过了：doSave()，getListCount()，doDelete()，getDetails()都不错。

但是，在getList()方法中发生错误！

为什么？该方法没有参数，只有一个查询。

select * from tb_board_data

我的配置：这里的MyBatis 3.2.2/MyBatis的弹簧1.2.0/3.2.2春季

package kr.co.goodwilldd.board.mapper; 

import java.util.ArrayList; 

import org.apache.ibatis.annotations.Delete; 
import org.apache.ibatis.annotations.Insert; 
import org.apache.ibatis.annotations.Select; 
import org.apache.ibatis.annotations.SelectKey; 
import org.apache.ibatis.mapping.StatementType; 
import org.springframework.stereotype.Repository; 

@Repository 
public interface CommonBoardMapper<T> { 

    @Select(value = "SELECT COUNT(*) FROM TB_BOARD_DATA") 
    public long getListCount(); 

    @Select(value = "SELECT * FROM TB_BOARD_DATA") 
    public ArrayList<T> getList(); 

    @Select(value = "SELECT * FROM TB_BOARD_DATA WHERE bseq = #{_seq}") 
    public T getDetails(long _seq); 

    @SelectKey(before=true, keyProperty="bseq", statementType=StatementType.PREPARED, statement="SELECT (IFNULL(MAX(BSEQ),0)+1) as bseq FROM TB_BOARD_DATA", resultType=Long.class) 
    @Insert(value = "INSERT INTO TB_BOARD_DATA(bseq, boardName, register, subject, content, reStep, reLevel, regdate) SELECT #{bseq}, #{boardName}, #{register}, #{subject}, #{content}, ifnull(((floor(max(reStep)/100))+1)*100+99, 199) , 0, CURRENT_DATE() FROM TB_BOARD_DATA") 
    public int doSave(T t); 

    @Delete(value = "DELETE FROM TB_BOARD_DATA WHERE bseq = #{_seq}") 
    public int doDelete(long _seq); 
}

错误日志：

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database. Cause: java.lang.UnsupportedOperationException 
### The error may exist in kr/co/goodwilldd/board/mapper/CommonBoardMapper.java (best guess) 
### The error may involve defaultParameterMap 
### The error occurred while setting parameters 
### SQL: SELECT * FROM TB_BOARD_DATA 
### Cause: java.lang.UnsupportedOperationException 
    at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73) 
    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:364) 
    at com.sun.proxy.$Proxy13.selectList(Unknown Source) 
    at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:194) 
    at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:114) 
    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:58) 
    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:43) 
    at com.sun.proxy.$Proxy25.getList(Unknown Source) 
    at kr.co.goodwilldd.board.CommonBoardTest.getListByMapper(CommonBoardTest.java:31) 
    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.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74) 
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83) 
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) 
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) 
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88) 
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) 
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) 
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) 
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) 
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) 
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) 
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236) 
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) 
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 
Caused by: org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database. Cause: java.lang.UnsupportedOperationException 
### The error may exist in kr/co/goodwilldd/board/mapper/CommonBoardMapper.java (best guess) 
### The error may involve defaultParameterMap 
### The error occurred while setting parameters 
### SQL: SELECT * FROM TB_BOARD_DATA 
### Cause: java.lang.UnsupportedOperationException 
    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:23) 
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:107) 
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:98) 
    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.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:354) 
    ... 36 more 
Caused by: java.lang.UnsupportedOperationException 
    at org.apache.ibatis.reflection.wrapper.CollectionWrapper.findProperty(CollectionWrapper.java:42) 
    at org.apache.ibatis.reflection.MetaObject.findProperty(MetaObject.java:76) 
    at org.apache.ibatis.executor.resultset.FastResultSetHandler.applyAutomaticMappings(FastResultSetHandler.java:342) 
    at org.apache.ibatis.executor.resultset.FastResultSetHandler.getRowValue(FastResultSetHandler.java:267) 
    at org.apache.ibatis.executor.resultset.FastResultSetHandler.handleRowValues(FastResultSetHandler.java:216) 
    at org.apache.ibatis.executor.resultset.FastResultSetHandler.handleResultSet(FastResultSetHandler.java:188) 
    at org.apache.ibatis.executor.resultset.FastResultSetHandler.handleResultSets(FastResultSetHandler.java:154) 
    at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:57) 
    at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:70) 
    at org.apache.ibatis.executor.ReuseExecutor.doQuery(ReuseExecutor.java:54) 
    at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:259) 
    at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:132) 
    at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:105) 
    at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81) 
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:104) 
    ... 42 more

来源

2013-05-14 GoodwillDD

您应该指定一个具体类型作为退货类型，如

List<Customer> getList();

，但没有通用型

List<T> getList();

或

List getList();

因为如果你指定类型，MyBatis会使用BeanWrapper的每一行转换的类型。但是，如果没有特定的类型，mybatis会将每一行视为List，并使用CollectionWrapper，而不支持findProperty。

来源

2013-05-15 15:11:38 duanjfeng

试试这个：

@Select(value = "SELECT * FROM TB_BOARD_DATA") 
public List<T> getList();

来源

2014-02-02 05:52:57 user3262100

始终遵循代码接口:)

要么使用通用

@Select(value = "SELECT * FROM TB_BOARD_DATA") 
public List<T> getList();

或非通用

@Select(value = "SELECT * FROM TB_BOARD_DATA") 
    public List<String> getList();

来源

2015-03-13 04:08:30

如果你看到OOPS的设计原则说，总是“编程接口不实施”。我们应该遵循这种做法，它会避免许多不希望的例外。

来源

2016-04-20 06:49:56 Mukesh

你的错误是

getList(Unknown Source)

请提供相同的返回类型，同时调用该方法也。 List是指列表或ArrayList表示ArrayList

来源

2017-09-06 22:22:05

mybatis。 java.lang.UnsupportedOperationException

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