springBoot使用pageHelper报空指针异常

今天药忘吃喽~ 2023-06-21 12:30 3阅读 0赞

项目中使用Mybatis+pagehelper正常运行没有问题，应需求要求需要配置多数据源，可是当我配置完后，新的数据源正常运行，原来查询的都出空指针异常了、   
错误如下：

2017-09-20 19:59:40.256 ERROR 17836 --- \[nio-1010-exec-1\] .p.s.c.m.e.GlobalDefaultExceptionHandler : -----------------------全局统一异常异常处理-----------------------  
2017-09-20 19:59:40.260 ERROR 17836 --- \[nio-1010-exec-1\] .p.s.c.m.e.GlobalDefaultExceptionHandler : org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:   
\#\#\# **Error querying database.  Cause: java.lang.NullPointerException  
\#\#\# The error may exist in com/paic/srvbot/change/dao/StepDao.java (best guess)  
\#\#\# The error may involve com.paic.srvbot.change.dao.StepDao.selectByExample\_COUNT  
\#\#\# The error occurred while handling results  
\#\#\# SQL: SELECT count(0) FROM srv\_change\_step LIMIT 10  
\#\#\# Cause: java.lang.NullPointerException**  
    at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:77)  
    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)  
    at com.sun.proxy.$Proxy123.selectList(Unknown Source)  
    at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)  
    at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:137)  
    at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:75)  
    at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)  
    at com.sun.proxy.$Proxy161.selectByExample(Unknown Source)  
    at com.paic.srvbot.change.service.impl.StepServiceImpl.findSteps(StepServiceImpl.java:64)  
    at com.paic.srvbot.change.service.impl.StepServiceImpl$$FastClassBySpringCGLIB$$a9da154a.invoke(<generated>)  
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)  
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)  
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)  
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)  
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)  
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)  
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)  
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:656)  
    at com.paic.srvbot.change.service.impl.StepServiceImpl$$EnhancerBySpringCGLIB$$f955a0c0.findSteps(<generated>)  
    at com.paic.srvbot.change.controller.StepController.find(StepController.java:46)  
    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:497)  
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)  
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)  
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116)  
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)  
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)  
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)  
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)  
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)  
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)  
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)  
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)  
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)  
    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:52)  
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)  
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)  
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:208)  
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)  
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)  
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)  
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)  
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)  
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)  
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)  
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)  
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)  
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)  
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)  
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)  
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)  
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)  
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)  
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)  
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)  
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)  
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)  
    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:198)  
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)  
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474)  
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)  
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)  
    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:783)  
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)  
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798)  
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434)  
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)  
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)  
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)  
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)  
    at java.lang.Thread.run(Thread.java:745)  
Caused by: org.apache.ibatis.exceptions.PersistenceException:   
\#\#\# Error querying database.  Cause: java.lang.NullPointerException  
\#\#\# The error may exist in com/paic/srvbot/change/dao/StepDao.java (best guess)  
\#\#\# The error may involve com.paic.srvbot.change.dao.StepDao.selectByExample\_COUNT  
\#\#\# The error occurred while handling results  
\#\#\# SQL: SELECT count(0) FROM srv\_change\_step LIMIT 10  
\#\#\# Cause: java.lang.NullPointerException  
    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)  
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)  
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)  
    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:497)  
    at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)  
    ... 78 more  
Caused by: java.lang.NullPointerException  
    at com.github.pagehelper.dialect.AbstractHelperDialect.afterCount(AbstractHelperDialect.java:71)  
    at com.github.pagehelper.PageHelper.afterCount(PageHelper.java:73)  
    at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:115)  
    at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)  
    at com.sun.proxy.$Proxy210.query(Unknown Source)  
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)  
    ... 84 more  
  
原因是依赖引得不对   
原来的

application.properties

pagehelper.helperDialect=PostgreSQL  
1  
重点内容

<dependency>  
            <groupId>com.github.pagehelper</groupId>  
            <artifactId>pagehelper-spring-boot-starter</artifactId>  
            <version>1.1.0</version>  
        </dependency>  
  
更改后的

<dependency>  
            <groupId>com.github.pagehelper</groupId>  
            <artifactId>pagehelper</artifactId>  
            <version>5.0.0</version>  
       </dependency>