NoClassDefFoundError: Could not initialize class （sqlSession文件）

事情是这样的：

在跟着网上项目，利用myBatis做增删改查时，在xml文件里添加了一个update语句之后，发现web项目的登录操作没有反应，在idea上查看报错，第一次点击登录没有反应时控制台报错内容如下：

14-Apr-2022 09:32:00.958 SEVERE [http-nio-8080-exec-5] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [UserController] in context with path [/crm] threw exception [Servlet execution threw an exception] with root causejava.lang.StringIndexOutOfBoundsException: String index out of range: 13at java.lang.String.charAt(String.java:658)at org.apache.ibatis.builder.ParameterExpression.trimmedStr(ParameterExpression.java:131)at org.apache.ibatis.builder.ParameterExpression.option(ParameterExpression.java:124)at org.apache.ibatis.builder.ParameterExpression.jdbcTypeOpt(ParameterExpression.java:99)at org.apache.ibatis.builder.ParameterExpression.property(ParameterExpression.java:70)at org.apache.ibatis.builder.ParameterExpression.parse(ParameterExpression.java:47)at org.apache.ibatis.builder.ParameterExpression.<init>(ParameterExpression.java:39)at org.apache.ibatis.builder.SqlSourceBuilder$ParameterMappingTokenHandler.parseParameterMapping(SqlSourceBuilder.java:128)at org.apache.ibatis.builder.SqlSourceBuilder$ParameterMappingTokenHandler.buildParameterMapping(SqlSourceBuilder.java:72)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.defaults.RawSqlSource.<init>(RawSqlSource.java:46)at org.apache.ibatis.scripting.defaults.RawSqlSource.<init>(RawSqlSource.java:40)at org.apache.ibatis.scripting.xmltags.XMLScriptBuilder.parseScriptNode(XMLScriptBuilder.java:58)at org.apache.ibatis.scripting.xmltags.XMLLanguageDriver.createSqlSource(XMLLanguageDriver.java:44)at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:94)at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:135)at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:128)at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:118)at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:92)at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.loadXmlResource(MapperAnnotationBuilder.java:173)at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.parse(MapperAnnotationBuilder.java:124)at org.apache.ibatis.binding.MapperRegistry.addMapper(MapperRegistry.java:72)at org.apache.ibatis.binding.MapperRegistry.addMappers(MapperRegistry.java:97)at org.apache.ibatis.binding.MapperRegistry.addMappers(MapperRegistry.java:105)at org.apache.ibatis.session.Configuration.addMappers(Configuration.java:737)at org.apache.ibatis.builder.xml.XMLConfigBuilder.mapperElement(XMLConfigBuilder.java:364)at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:119)at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java:99)at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:78)at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:64)at com.bjpowernode.crm.utils.SqlSessionUtil.<clinit>(SqlSessionUtil.java:26)at com.bjpowernode.crm.settings.service.impl.UserServiceImpl.<init>(UserServiceImpl.java:21)at com.bjpowernode.crm.settings.web.controller.UserController.login(UserController.java:46)at com.bjpowernode.crm.settings.web.controller.UserController.service(UserController.java:28)at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)at com.bjpowernode.crm.web.filter.LoginFilter.doFilter(LoginFilter.java:25)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)at com.bjpowernode.crm.web.filter.EncodingFilter.doFilter(EncodingFilter.java:19)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:784)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:802)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1452)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:748)

在多次点击登录之后，都会出现一致的下面报错：

java.lang.NoClassDefFoundError: Could not initialize class com.bjpowernode.crm.utils.SqlSessionUtilat com.bjpowernode.crm.settings.service.impl.UserServiceImpl.<init>(UserServiceImpl.java:21)

于是，开始查找NoClassDefFoundError错误的解决方案，结果没有收获。后来发现把update语句注释之后就可以正常运行了，问题出在 sql语法上，但是idea没有出现语法错误的报错，我的错误是这样的：

 <update id="update" >update tbl_activity setowner=#{owner},name=#{name},startDate=#{startDate},endDate=#{endDate}cost=#{cost},description=#{descri,ption}editTime=#{editTime},editBy=#{editBy}where id=#{id}</update>

可以看到，错误是，#｛endDate｝后面没有逗号， #｛description｝后面也没有逗号，且里面也多打了逗号。但是，sql语法错误在控制台并没有提示。

当我把错误改成，只有忘记写逗号时，才会有sql语法错误的提示，即，#｛endDate｝后面没有逗号， #｛description｝后面也没有逗号。控制台信息如下：
### The error may involve defaultParameterMap
### The error occurred while setting parameters

后来我单单把错误改成： #｛descri，ption｝又出现了NoClassDefFoundError的错误。

结论：在mybatis的xml文件中，赋值属性出现错误的话，控制台不会提示sql语法错误，而是NoClassDefFoundError错误

解决：传参时，一定要仔细、仔细、再仔细！

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