Mybatis遇到的問題

問題：

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'unitId' in 'class java.lang.String'at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:75)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:371)at com.sun.proxy.$Proxy6.selectList(Unknown Source)at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:198)at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:119)at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:63)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52)at com.sun.proxy.$Proxy11.getUsersByUnitId(Unknown Source)at com.thinkPro.steap.db.base.sys.user.UserBase.getUsersByUnitId(UserBase.java:125)at com.thinkPro.steap.db.service.sys.user.UserService.getUsersByUnitId(UserService.java:188)at com.thinkPro.steap.test.TestUser.testGetUsersByUnitId(TestUser.java:184)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)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$2.evaluate(ParentRunner.java:268)at org.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'unitId' in 'class java.lang.String'at org.apache.ibatis.reflection.Reflector.getGetInvoker(Reflector.java:380)at org.apache.ibatis.reflection.MetaClass.getGetInvoker(MetaClass.java:170)at org.apache.ibatis.reflection.wrapper.BeanWrapper.getBeanProperty(BeanWrapper.java:152)at org.apache.ibatis.reflection.wrapper.BeanWrapper.get(BeanWrapper.java:48)at org.apache.ibatis.reflection.MetaObject.getValue(MetaObject.java:116)at org.apache.ibatis.scripting.xmltags.DynamicContext$ContextMap.get(DynamicContext.java:97)at org.apache.ibatis.scripting.xmltags.DynamicContext$ContextAccessor.getProperty(DynamicContext.java:116)at org.apache.ibatis.ognl.OgnlRuntime.getProperty(OgnlRuntime.java:1657)at org.apache.ibatis.ognl.ASTProperty.getValueBody(ASTProperty.java:92)at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:210)at org.apache.ibatis.ognl.ASTNotEq.getValueBody(ASTNotEq.java:49)at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:210)at org.apache.ibatis.ognl.ASTAnd.getValueBody(ASTAnd.java:56)at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:170)at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:210)at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:333)at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:310)at org.apache.ibatis.scripting.xmltags.OgnlCache.getValue(OgnlCache.java:45)at org.apache.ibatis.scripting.xmltags.ExpressionEvaluator.evaluateBoolean(ExpressionEvaluator.java:32)at org.apache.ibatis.scripting.xmltags.IfSqlNode.apply(IfSqlNode.java:33)at org.apache.ibatis.scripting.xmltags.MixedSqlNode.apply(MixedSqlNode.java:32)at org.apache.ibatis.scripting.xmltags.TrimSqlNode.apply(TrimSqlNode.java:54)at org.apache.ibatis.scripting.xmltags.MixedSqlNode.apply(MixedSqlNode.java:32)at org.apache.ibatis.scripting.xmltags.DynamicSqlSource.getBoundSql(DynamicSqlSource.java:40)at org.apache.ibatis.mapping.MappedStatement.getBoundSql(MappedStatement.java:278)at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:75)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)... 32 more

分析：

那么什么情況下會發生“There is no getter for property named in ‘class java.lang.String’”錯誤呢？

其實是在這種情況下：

<select id="getRiskMember" resultMap="BaseResultMap" parameterType="String"><include refid="selectMember"/>and safetylevel > 1and stauts = 1<if test="username != null">and username = #{username} </if></select>

注意看，是在if test=驗證的時候發生的 “There is no getter for property named in ‘class java.lang.String’”，

而并非是and username = #{username} 的時候發生的錯誤。

解決辦法：

<select id="getRiskMember" resultMap="BaseResultMap" parameterType="String"><include refid="selectMember"/>and safetylevel > 1and stauts = 1<if test="_parameter != null">and username = #{username} </if></select>

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