自己项目中出现的错误总结：-优快云博客

本文汇总了Java Web开发中常见的错误及其解决方案，包括数据库连接、Struts框架配置、Servlet加载等问题，为开发者提供实用的排错指南。

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自己项目中出现的错误总结：

错误代码：

java.lang.ClassNotFoundException: com.microsoft.jdbc.sqlserver.SQLServerDriver

解决方法：

需要把 sql 数据库的三个（ mssqlserver.jar 、 msutil.jar 、 msbase.jar ） jar 包拷贝到 tomcat 的 lib 下或自己项目的 lib 下，并重启 tomcat 。

错误代码：

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet execution threw an exception

root cause

java.lang.Error: Unresolved compilation problem:

 
The method setAttribute(String, Object) in the type ServletRequest is not applicable for the arguments (String, int)

 
com.haofa.struts.CalAction.execute(CalAction.java:32)

 
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)

 
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)

 
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)

 
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)

 
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)

 
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

解决方法：

重新修改此方法 ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

3. 错误代码：

org.apache.jasper.JasperException: /admin/adminUser/../incs/checkPurview.jsp(1,1) Page directive: illegal to have

multiple occurrences of contentType with different values (old: text/html; charset=utf-8, new: text/html;charset=utf-8)

org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)

org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)

org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:236)

org.apache.jasper.compiler.Validator$DirectiveVisitor.visit(Validator.java:133)

org.apache.jasper.compiler.Node$PageDirective.accept(Node.java:590)

org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2343)

org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2393)

org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2399)

org.apache.jasper.compiler.Node$Root.accept(Node.java:489)

org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2343)

org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2393)

org.apache.jasper.compiler.Validator$DirectiveVisitor.visit(Validator.java:100)

org.apache.jasper.compiler.Node$IncludeDirective.accept(Node.java:638)

org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2343)

org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2393)

org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2399)

org.apache.jasper.compiler.Node$Root.accept(Node.java:489)

org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2343)

org.apache.jasper.compiler.Validator.validate(Validator.java:1700)

org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:165)

org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)

org.apache.jasper.compiler.Compiler.compile(Compiler.java:294)

org.apache.jasper.compiler.Compiler.compile(Compiler.java:281)

org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)

javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

该文章转载自 IT 学习网： http://www.itstudy.cn/www/articleContent.asp?id=92

解决方法：

checkPurview.jsp 代码是没有错的，因为在其它页面调用没有出错过。那么是主文件出错了，看了一下刚写的页面全是静态内容，没什

么的？

仔细阅读错误信息：

Page directive: illegal to have multiple occurrences of contentType with different values (old: text/html; charset=utf-8,

new: text/html;charset=utf-8)

中文大致意思：多个不同的 ContentType 值是非法的。

我英文不好，意思是理解了：包含页面与被包含页面的 @page 指令里面的 contentType 不一致，仔细检查两个文件第一行的 @page ，

包含页面的是：

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>

被包含页面：

<%@ page language="java" contentType="text/html;charset=utf-8" pageEncoding="utf-8"%>

果然 contentType="text/html; 和 charset=utf-8" 之间多了一个空格，删除空格，使得两个文件的 @page 内容一致，再执行程序，运行通过。

我曾经尝试着在一个里面加上一个空格再次出现了同样的错误。

总结：被包含页面和包含页面必须都加上 @page 头内容这个 asp 正好相反的，而且值要一致。一个很小的错误，让我调了 2 分钟，网上信手搜索了一下居然很多人也犯这样的错误，而且居然无从下手，想来大家只要英文稍微好些就看懂错误提示了，看来还是我们的基本功不扎实了，不扎实 -- 沙上盖楼，终不会高 ......

该文章转载自 IT 学习网： http://www.itstudy.cn/www/articleContent.asp?id=92

4. 错误代码：

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

There is no Action mapped for namespace / and action name upload. - [unknown location]

 
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:186)

 
org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:41)

 
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:497)

 
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:421)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.

Apache Tomcat/6.0.18

no Action mapped for namespace / and action name

问题异常如下：

警告 :Couldnotfindactionorresult
ThereisnoActionmappedfor namespace/andactionnamelogin.-[unknownlocation]
atcom.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:177 )
atorg.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61 )
atorg.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39 )
atcom.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:47 ) 警告 : Could not find action or result

There is no Action mapped for namespace / and action name login. - [unknown location]

 
at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:177)

 
at org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)

 
at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)

 
at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:47)

 
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:458)

 
at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)

 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)

 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)

 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)

 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)

 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)

 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)

 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)

 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)

 
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)

 
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)

 
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)

 
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)

 
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)

 
at java.lang.Thread.run(Thread.java:595)

解决方法：

There is no Action mapped for namespace / and action name login. - [unknown location]

有经验的就知道，这个是因为没有找到映射的 action 空间名或者没有找到匹配的 action 名。
出现这样的问题，一般是因为没有加载配置文件引起的。

果然。在布署的工程目录 classes 下，没有找到 struts.xml 。

一般而言，对于没有经验的程序员来说，习惯用于集成 IDE 。以为在 IDE 里面的文件，理所当然的会把各种文件布署在对应的目录下。但往往有些时候，它也偶尔会发发脾气，不听使唤的。 ^-^
在其他的时候，也会因为使用 IDE 造成这样或者那样的错误。所以还是要自己明白，整个运行流程。然后一步一步的去排查。

3. 错误代码：

严重 : Allocate exception for servlet ServletText

java.lang.NoClassDefFoundError: IllegalName: football.model.domain/ServletText

at java.lang.ClassLoader.preDefineClass( ClassLoader.java:477 )

at java.lang.ClassLoader.defineClass( ClassLoader.java:615 )

at java.security.SecureClassLoader.defineClass( SecureClassLoader.java:124 )

at org.apache.catalina.loader.WebappClassLoader.findClassInternal( WebappClassLoader.java:1817 )

at org.apache.catalina.loader.WebappClassLoader.findClass( WebappClassLoader.java:872 )

at org.apache.catalina.loader.WebappClassLoader.loadClass( WebappClassLoader.java:1325 )

at org.apache.catalina.loader.WebappClassLoader.loadClass( WebappClassLoader.java:1204 )

at org.apache.catalina.core.StandardWrapper.loadServlet( StandardWrapper.java:1083 )

at org.apache.catalina.core.StandardWrapper.allocate( StandardWrapper.java:806 )

解决方法：

解决：

Web.xml

< servlet >

< servlet-name > ServletText </ servlet-name >

<servlet-class>football.model.domain.ServletText</servlet-class>

</ servlet >

< servlet-mapping >

3. 错误代码：

严重 : Servlet.service() for servlet LoginServlet threw exception

java.lang.NullPointerException

at football.model.domain.LoginServlet.doPost( LoginServlet.java:24 )

at javax.servlet.http.HttpServlet.service( HttpServlet.java:710 )

at javax.servlet.http.HttpServlet.service( HttpServlet.java:803 )

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:290 )

at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:206 )

at org.apache.catalina.core.StandardWrapperValve.invoke( StandardWrapperValve.java:233 )

at org.apache.catalina.core.StandardContextValve.invoke( StandardContextValve.java:175 )

at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:128 )

at org.apache.catalina.valves.ErrorReportValve.invoke( ErrorReportValve.java:102 )

at org.apache.catalina.core.StandardEngineValve.invoke( StandardEngineValve.java:109 )

at org.apache.catalina.connector.CoyoteAdapter.service( CoyoteAdapter.java:263 )

at org.apache.coyote.http11.Http11Processor.process( Http11Processor.java:844 )

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process( Http11Protocol.java:584 )

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run( JIoEndpoint.java:447 )

at java.lang.Thread.run( Thread.java:619 )

解决方法：

表单提交的数据为空

3. 错误代码：

严重 : Servlet.service() for servlet jsp threw exception

org.hibernate.MappingException : Could not determine type for: bit, for columns: [org.hibernate.mapping.Column(is_show)]

at org.hibernate.mapping.SimpleValue.getType( SimpleValue.java:266 )

at org.hibernate.mapping.SimpleValue.isValid( SimpleValue.java:253 )

at org.hibernate.mapping.Property.isValid( Property.java:185 )

at org.hibernate.mapping.PersistentClass.validate( PersistentClass.java:440 )

at org.hibernate.mapping.RootClass.validate( RootClass.java:192 )

at org.hibernate.cfg.Configuration.validate( Configuration.java:1102 )

at org.hibernate.cfg.Configuration.buildSessionFactory( Configuration.java:1287 )

at com.taobao.dao.HibernateUtil.<clinit>( HibernateUtil.java:22 )

at com.taobao.sys.HibernateFilter.doFilter( HibernateFilter.java:32 )

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:235 )

at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:206 )

at org.apache.catalina.core.StandardWrapperValve.invoke( StandardWrapperValve.java:233 )

at org.apache.catalina.core.StandardContextValve.invoke( StandardContextValve.java:191 )

at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:128 )

at org.apache.catalina.valves.ErrorReportValve.invoke( ErrorReportValve.java:102 )

at org.apache.catalina.core.StandardEngineValve.invoke( StandardEngineValve.java:109 )

at org.apache.catalina.connector.CoyoteAdapter.service( CoyoteAdapter.java:286 )

at org.apache.coyote.http11.Http11Processor.process( Http11Processor.java:845 )

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process( Http11Protocol.java:583 )

at org.apache.tomcat.util.net.JIoEndpoint$Worker.run( JIoEndpoint.java:447 )

at java.lang.Thread.run( Thread.java:619 )

错误分析： Hibernate 配置映射文件的对应字段类型和数据库类型不一致

解决方法：

对应的配置文件里的数据类型

3. 错误代码：

2009-7-1 10:56:42 org.apache.catalina.core.StandardWrapperValve invoke

严重 : Servlet.service() for servlet struts threw exception

java.lang.IllegalArgumentException : argument type mismatch

at sun.reflect.NativeMethodAccessorImpl.invoke0( Native Method )

at sun.reflect.NativeMethodAccessorImpl.invoke( NativeMethodAccessorImpl.java:39 )

at sun.reflect.DelegatingMethodAccessorImpl.invoke( DelegatingMethodAccessorImpl.java:25 )

at java.lang.reflect.Method.invoke( Method.java:597 )

at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set( BasicPropertyAccessor.java:42 )

at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues( AbstractEntityTuplizer.java:337 )

at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues( PojoEntityTuplizer.java:200 )

at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues( AbstractEntityPersister.java:3566 )

at org.hibernate.engine.TwoPhaseLoad.initializeEntity( TwoPhaseLoad.java:129 )

at org.hibernate.loader.Loader.initializeEntitiesAndCollections( Loader.java:854 )

at org.hibernate.loader.Loader.doQuery( Loader.java:729 )

at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections( Loader.java:236 )

at org.hibernate.loader.Loader.doList( Loader.java:2220 )

at org.hibernate.loader.Loader.listIgnoreQueryCache( Loader.java:2104 )

at org.hibernate.loader.Loader.list( Loader.java:2099 )

at org.hibernate.loader.hql.QueryLoader.list( QueryLoader.java:378 )

at org.hibernate.hql.ast.QueryTranslatorImpl.list( QueryTranslatorImpl.java:338 )

at org.hibernate.engine.query.HQLQueryPlan.performList( HQLQueryPlan.java:172 )

at org.hibernate.impl.SessionImpl.list( SessionImpl.java:1121 )

at org.hibernate.impl.QueryImpl.list( QueryImpl.java:79 )

at com.taobao.dao.ConsumerDao.getBynameAndPassword( ConsumerDao.java:30 )

at com.taobao.service.ConsumerService.login( ConsumerService.java:16 )

at com.taobao.action.LoginAction.execute( LoginAction.java:33 )

at org.apache.struts.chain.commands.servlet.ExecuteAction.execute( ExecuteAction.java:58 )

at org.apache.struts.chain.commands.AbstractExecuteAction.execute( AbstractExecuteAction.java:67 )

at org.apache.struts.chain.commands.ActionCommandBase.execute( ActionCommandBase.java:51 )

at org.apache.commons.chain.impl.ChainBase.execute( ChainBase.java:190 )

at org.apache.commons.chain.generic.LookupCommand.execute( LookupCommand.java:304 )

at org.apache.commons.chain.impl.ChainBase.execute( ChainBase.java:190 )

at org.apache.struts.chain.ComposableRequestProcessor.process( ComposableRequestProcessor.java:283 )

at org.apache.struts.action.ActionServlet.process( ActionServlet.java:1913 )

at org.apache.struts.action.ActionServlet.doPost( ActionServlet.java:462 )

at javax.servlet.http.HttpServlet.service( HttpServlet.java:637 )

at javax.servlet.http.HttpServlet.service( HttpServlet.java:717 )

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:290 )

at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:206 )

at com.taobao.sys.HibernateFilter.doFilter( HibernateFilter.java:31 )