MySQLSyntaxErrorException：在「字段列表」未知列

我開始使用Spring + MVC編碼，我得到了一個錯誤MySQLSyntaxErrorException：在「字段列表」未知列

這是回溯的最後一行：

com.mysql.jdbc.exceptions .jdbc4.MySQLSyntaxErrorException：在「字段列表」

未知列「task0_.category_name」我改變了表，所以常常但這種「CATEGORY_NAME」不會改變。

DROP TABLE IF EXISTS tasks_t; 

CREATE TABLE tasks_t (
    id int(11) NOT NULL AUTO_INCREMENT, 
    name varchar(45) DEFAULT NULL, 
    description varchar(45) DEFAULT NULL, 
    categoryName varchar(45) DEFAULT NULL, 
    date_created datetime DEFAULT NULL, 
    finished bit(1) DEFAULT b'0', 
    PRIMARY KEY (id) 
);

MY JSP代碼

<c:when test="${mode == 'MODE_TASKS'}"> 
 
\t \t \t <div class="container text-center" id="tasksDiv"> 
 
\t \t \t \t <h3>CATEGORY 1</h3> 
 
\t \t \t \t <hr> 
 
\t \t \t \t <div class="table-responsive"> 
 
\t \t \t \t \t <table class="table table-striped table-bordered text-left"> 
 
\t \t \t \t \t \t <thead> 
 
\t \t \t \t \t \t \t <tr> 
 
\t \t \t \t \t \t \t \t <th>Id</th> 
 
\t \t \t \t \t \t \t \t <th>Name</th> 
 
\t \t \t \t \t \t \t \t <th>Description</th> 
 
           <th>Category</th> 
 
\t \t \t \t \t \t \t \t <th>Date Created</th> 
 
\t \t \t \t \t \t \t \t <th>Finished</th> 
 
\t \t \t \t \t \t \t \t <th></th> 
 
\t \t \t \t \t \t \t \t <th></th> 
 
\t \t \t \t \t \t \t </tr> 
 
\t \t \t \t \t \t </thead> 
 
\t \t \t \t \t \t <tbody> 
 
\t \t \t \t \t \t \t <c:forEach var="task" items="${tasks}"> 
 
\t \t \t \t \t \t \t \t <tr> 
 
\t \t \t \t \t \t \t \t \t <td>${task.id}</td> 
 
\t \t \t \t \t \t \t \t \t <td>${task.name}</td> 
 
\t \t \t \t \t \t \t \t \t <td>${task.description}</td> 
 
\t \t \t \t \t \t \t \t \t <td>${task.categoryName}</td> 
 
\t \t \t \t \t \t \t \t \t <td><fmt:formatDate pattern="yyyy-MM-dd HH:mm:ss" value="${task.dateCreated}"/></td> 
 
\t \t \t \t \t \t \t \t \t <td>${task.finished}</td> 
 
\t \t \t \t \t \t \t \t \t <td><a href="update-task?id=${task.id}"><span class="glyphicon glyphicon-pencil"></span></a></td> 
 
\t \t \t \t \t \t \t \t \t <td><a href="delete-task?id=${task.id}"><span class="glyphicon glyphicon-trash"></span></a></td> 
 
\t \t \t \t \t \t \t \t </tr> 
 
\t \t \t \t \t \t \t </c:forEach> 
 
\t \t \t \t \t \t \t 
 
\t \t \t \t \t \t \t 
 
\t \t \t \t \t \t </tbody> 
 
\t \t \t \t \t </table> 
 
\t \t \t \t </div> 
 
\t \t \t </div> 
 
\t \t \t <hr> 
 
\t \t \t <center>${statistics}</center> 
 
\t \t \t <hr> 
 
\t \t </c:when>

堆棧跟蹤

2017-01-21 22:55:14.745 DEBUG 20288 --- [nio-8080-exec-3] org.hibernate.SQL      : select task0_.id as id1_0_, task0_.category_name as category2_0_, task0_.date_created as date_cre3_0_, task0_.description as descript4_0_, task0_.finished as finished5_0_, task0_.name as name6_0_ from tasks_t task0_ 
2017-01-21 22:55:14.745 WARN 20288 --- [nio-8080-exec-3] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 1054, SQLState: 42S22 
2017-01-21 22:55:14.746 ERROR 20288 --- [nio-8080-exec-3] o.h.engine.jdbc.spi.SqlExceptionHelper : Unknown column 'task0_.category_name' in 'field list' 
2017-01-21 22:55:14.751 ERROR 20288 --- [nio-8080-exec-3] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessResourceUsageException: could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet] with root cause 

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'task0_.category_name' in 'field list' 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_91] 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_91] 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_91] 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_91] 
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) ~[mysql-connector-java-5.1.39.jar:5.1.39] 
    at com.mysql.jdbc.Util.getInstance(Util.java:387) ~[mysql-connector-java-5.1.39.jar:5.1.39] 
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:942) ~[mysql-connector-java-5.1.39.jar:5.1.39] 
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3966) ~[mysql-connector-java-5.1.39.jar:5.1.39] 
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3902) ~[mysql-connector-java-5.1.39.jar:5.1.39] 
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2526) ~[mysql-connector-java-5.1.39.jar:5.1.39] 
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2673) ~[mysql-connector-java-5.1.39.jar:5.1.39] 
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2549) ~[mysql-connector-java-5.1.39.jar:5.1.39] 
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861) ~[mysql-connector-java-5.1.39.jar:5.1.39] 
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1962) ~[mysql-connector-java-5.1.39.jar:5.1.39] 
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:70) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.loader.Loader.getResultSet(Loader.java:2117) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1900) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1876) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.loader.Loader.doQuery(Loader.java:919) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.loader.Loader.doList(Loader.java:2617) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.loader.Loader.doList(Loader.java:2600) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2429) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.loader.Loader.list(Loader.java:2424) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:501) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:371) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1326) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.internal.QueryImpl.list(QueryImpl.java:87) ~[hibernate-core-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606) ~[hibernate-entitymanager-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:483) ~[hibernate-entitymanager-5.0.11.Final.jar:5.0.11.Final] 
    at org.hibernate.jpa.criteria.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:50) ~[hibernate-entitymanager-5.0.11.Final.jar:5.0.11.Final] 
    at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:327) ~[spring-data-jpa-1.10.3.RELEASE.jar:na] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_91] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_91] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_91] 
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_91] 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:503) ~[spring-data-commons-1.12.3.RELEASE.jar:na] 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:488) ~[spring-data-commons-1.12.3.RELEASE.jar:na] 
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:460) ~[spring-data-commons-1.12.3.RELEASE.jar:na] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:61) ~[spring-data-commons-1.12.3.RELEASE.jar:na] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:133) ~[spring-data-jpa-1.10.3.RELEASE.jar:na] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at com.sun.proxy.$Proxy82.findAll(Unknown Source) ~[na:na] 
    at clist.service.TaskService.findAll(TaskService.java:24) ~[classes/:na] 
    at clist.service.TaskService$$FastClassBySpringCGLIB$$6fb519aa.invoke(<generated>) ~[classes/:na] 
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655) ~[spring-aop-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at clist.service.TaskService$$EnhancerBySpringCGLIB$$9d75651c.findAll(<generated>) ~[classes/:na] 
    at clist.controller.MainController.allTasks(MainController.java:39) ~[classes/:na] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_91] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_91] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_91] 
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_91] 
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:89) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.3.RELEASE.jar:4.3.3.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:784) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:802) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1410) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_91] 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_91] 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.5.jar:8.5.5] 
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_91]

當我去http://localhost:8080/all-tasks 我總是

Whitelabel Error Page 

This application has no explicit mapping for /error, so you are seeing this as a fallback. 

Sat Jan 21 23:15:52 BRT 2017 
There was an unexpected error (type=Internal Server Error, status=500). 
could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet

package clist.model; 

import java.io.Serializable; 
import java.util.Date; 

import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
import javax.persistence.Temporal; 
import javax.persistence.TemporalType; 

@Entity(name = "tasks_t") 
public class Task implements Serializable { 

    private static final long serialVersionUID = 1L; 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    private int id; 
    private String name; 
    private String description; 
    private String categoryName; 
    @Temporal(TemporalType.TIMESTAMP) 
    private Date dateCreated; 
    private boolean finished; 

    public Task() { 
    } 

    public Task(String name, String description, String categoryName, Date dateCreated, boolean finished) { 
     super(); 
     this.name = name; 
     this.description = description; 
     this.categoryName = categoryName; 
     this.dateCreated = dateCreated; 
     this.finished = finished; 
    } 

    public int getId() { 
     return id; 
    } 

    public void setId(int id) { 
     this.id = id; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public String getDescription() { 
     return description; 
    } 

    public void setDescription(String description) { 
     this.description = description; 
    } 

    public Date getDateCreated() { 
     return dateCreated; 
    } 

    public void setDateCreated(Date dateCreated) { 
     this.dateCreated = dateCreated; 
    } 

    public boolean isFinished() { 
     return finished; 
    } 

    public void setFinished(boolean finished) { 
     this.finished = finished; 
    } 

    public String getCategoryName() { 
     return categoryName; 
    } 

    public void setCategoryName(String categoryName) { 
     this.categoryName = categoryName; 
    } 

    @Override 
    public String toString() { 
     return "id = " + id + ", name = " + name + ", description = " + description + ", dateCreated = " + dateCreated 
       + ", finished = " + finished + ", categoryName = " + categoryName; 
    } 
}

MainController

@GetMapping("/all-tasks") 
public String allTasks(HttpServletRequest request) { 
    request.setAttribute("tasks", taskService.findAll()); 
    request.setAttribute("mode", "MODE_TASKS"); 
    request.setAttribute("statistics", taskService.statistics()); 
    return "index"; 
} 

at

clist.service.TaskService $$ EnhancerBySpringCGLIB $$ 9d75651c.findAll（）〜[classes /：na] at clist.controller.MainController.allTasks（MainController.java:39）〜[classes /：na] at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）〜[na：1.8 .0_91]

當我點擊MainController它去了request.setAttribute（「任務」，taskService.findAll（））;

來源

2017-01-22 aabarbosa

是否否則，如果您沒有定義，也沒有在你的類並在頁面中使用'categoryName'工作？ –

如果您在表中將'categoryName'重命名爲'category_name'，它會起作用嗎？ –

嗨，是的，在類別名稱之前它工作。我在數據庫中重命名爲category_name，但仍然無法工作。 – aabarbosa

這是一個太初學者的錯誤。該數據庫沒有與新的參數配合我改變

我可以看到使用這個命令的問題：如果發生，它可能你的表不適合的參數

select column_name from information_schema.columns where table_name='tasks_t';

。

謝謝。

來源

2017-01-22 13:41:30 aabarbosa

刪除數據庫中的原始數據表關聯，然後重置兩個表之間的關係。我確實喜歡這個來解決問題。（com.mysql.jdbc.exceptions.jdbc4。mysqlsyntaxerrorexception：不詳列）

我認爲它可能是數據庫表的關係已經出現莫名其妙的問題導致Hibernate無法正確解析

來源

2017-05-22 10:01:03

你可以讓Hibernate加給你的屬性文件自動更新選擇查詢：

jpa.properties.hibernate.hbm2ddl.auto =更新

來源

2018-03-08 13:04:30

MySQLSyntaxErrorException：在「字段列表」未知列

回答

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