【日常Exception】第三十四回：mybatis-plus插入insert时null值导致报错，ExpressionSyntaxException: Malformed OGNL expressi

亦凉 2024-03-31 08:35 26阅读 0赞

## 1、问题 ##

今天使用mybatis-plus的insert方法时，显示插入报错，报错信息如下。

主要报错信息：

> **ExceptionDescription:org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.builder.BuilderException: Error evaluating expression 'lt != null'. Cause: org.apache.ibatis.ognl.ExpressionSyntaxException: Malformed OGNL expression: lt != null \[org.apache.ibatis.ognl.ParseException: Encountered " "lt" "lt "" at line 1, column 1.  
> Was expecting one of:**

全部异常信息如下：

ExceptionDescription:org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.builder.BuilderException: Error evaluating expression 'lt != null'. Cause: org.apache.ibatis.ognl.ExpressionSyntaxException: Malformed OGNL expression: lt != null [org.apache.ibatis.ognl.ParseException: Encountered " "lt" "lt "" at line 1, column 1.
    Was expecting one of:
        ":" ...
        "not" ...
        "+" ...
        "-" ...
        "~" ...
        "!" ...
        "(" ...
        "true" ...
        "false" ...
        "null" ...
        "#this" ...
        "#root" ...
        "#" ...
        "[" ...
        "{" ...
        "@" ...
        "new" ...
        <IDENT> ...
        <DYNAMIC_SUBSCRIPT> ...
        "\'" ...
        "`" ...
        "\"" ...
        <INT_LITERAL> ...
        <FLT_LITERAL> ...
        ]
    	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:92)
    	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:440)
    	at com.sun.proxy.$Proxy137.insert(null:-1)
    	at org.mybatis.spring.SqlSessionTemplate.insert(SqlSessionTemplate.java:271)
    	at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:60)
    	at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:96)
    	at com.sun.proxy.$Proxy160.insert(null:-1)
    	at xxx.xxx.xxx.report(xxxController.java:60)
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-2)
    	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.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
    	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
    	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
    	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879)
    	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
    	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
    	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
    	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
    	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
    	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
    	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    	at xxx.xxx.xxxFilter.doFilter(xxxFilter.java:47)
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    	at xxx.xxx.xxx.doFilter(xxxFilter.java:66)
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    	at xxx.xxx.xxx.doFilter(xxxFilter.java:33)
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:109)
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
    	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
    	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
    	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
    	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
    	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1639)
    	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    	at java.util.concurrent.ThreadPoolExecutor$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)

--------------------

## 2、解决方式 ##

在插入的字段上，加上注解**insertStrategy = FieldStrategy.IGNORED**：

@TableField(value = "et",insertStrategy = FieldStrategy.IGNORED)
    private LocalDateTime et;

如此，便可解决啦。插入策略有多种，可以按需设置。