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Exception loading sessions from persistent storage

田园风光 — Wed, 12 Aug 2009 15:37:00 GMT

做一个web��目�Q�启动tomcat旉��C��q�样一个错误：

严重: Exception loading sessions from persistent storage
java.io.WriteAbortedException: writing aborted�Q�java.io.NotSerializableException: ...

解决�Q�对象要必须实现java.io.Serializable接口;

田园风光 2009-08-12 23:37 发表评论

Illegal access: this web application instance has been stopped already .Could not load java.net.BindException

田园风光 — Sat, 25 Jul 2009 17:26:00 GMT

信息: Illegal access: this web application instance has been stopped already. Could not load java.net.BindException. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1244)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at com.mysql.jdbc.CommunicationsException.(CommunicationsException.java:155)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2723)

解决办法:
��tomcat的server.xml中的Context的reloadable设成false�?br /> 比如:

解决办法也容易，只要把tomcat的server.xml 中的reloadable="true" �Ҏ��false��p��了，不过�q�样做就失去了热部��v的优势了�Q�对于开发不是很方便�Q�干脆还是不改吧。这�U�错误不用理�?

报错原理�Q?/p>

原因是因为在tomcat重启的时候，因�ؓ之前的tomcat中的�U�程�q�没有完全关闭，新启动tomcat��׃��报这个异常，不过�q�个不媄响正�怋�用，只是跳个异常挺烦人的。��用过hibernate, spring或其他大型组�Ӟ��当一个WEB应用�pȝ��中有很多�c�L��Q�如果开启了Tomcat的reloadable=true,那么每当相关文�g改变�Ӟ�� Tomcat会停止web app�q��攑ֆ��?然后重新加蝲web app.�q�实在是个浩大的工程。所以我们��L��在想如果能有只重载某几个�cȝ��功能�Q�将极大的满��了我们的调试�?/p>

当response.sendRedirect("xxxx"); �?而客��L��关闭了浏览器,��׃��U�错.
�q��E�序错误.

引自�Q?/font>http://blog.csdn.net/m232341339/archive/2008/11/01/3201104.aspx

田园风光 2009-07-26 01:26 发表评论

Could not load java.net.BindException

田园风光 — Sat, 25 Jul 2009 17:11:00 GMT

出现了错误异常：
信息: Illegal access: this web application instance has been stopped already. Could not load java.net.BindException. The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1273)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at com.mysql.jdbc.SQLError.createLinkFailureMessageBasedOnHeuristics(SQLError.java:1220)
at com.mysql.jdbc.CommunicationsException.(CommunicationsException.java:51)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1070)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3270)
at com.mysql.jdbc.MysqlIO.quit(MysqlIO.java:1659)
at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4296)
at com.mysql.jdbc.ConnectionImpl.cleanup(ConnectionImpl.java:1265)
at com.mysql.jdbc.ConnectionImpl.finalize(ConnectionImpl.java:2667)
at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83)
at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)

在启�?/span> tomcat �Q��ƈ发布应用后没有问题，但是如果重新发布��出现如下异常：

this web application instance has been stopped already. Could not load java.net.BindException

this web application instance has been stopped already. Could not load com.mysql.jdbc

�q�是�׃�� MySQL �?/span> JDBC 驱动攑֜�应用�?/span> WEB-INF\lib 目录下，在重新发布时其加载了两次�Q�故只要��其拯��?/span> TOMCAT_HOME%\lib 中即可解册��问题�?/span>

解决�q�两个异常可以将 MySQL 的驱动文件从 WEB-INF\lib 文�g夹中�U�d��?/span> %TOMCAT_HOME%\lib 中�?/span>

引自�Q�http://m.tkk7.com/cmzy/archive/2009/03/25/261884.html

田园风光 2009-07-26 01:11 发表评论

java.lang.NoSuchMethodError

田园风光 — Sat, 25 Jul 2009 16:16:00 GMT

出现的错误异常：
严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.NoSuchMethodError: org.objectweb.asm.ClassVisitor.visit(IILjava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)V
Caused by: java.lang.NoSuchMethodError: org.objectweb.asm.ClassVisitor.visit(IILjava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)V

原因�Q�spring和hibernate的包不兼容，asm.jar(hibernate)和asm-2.2.3.jar(spring)

解决办法�Q�将asm-2.2.3.jar删除

田园风光 2009-07-26 00:16 发表评论

spring2.0+struts2.0+hibernate3.2整合�q�程中出现的错误

田园风光 — Fri, 24 Jul 2009 17:08:00 GMT

今天晚上把三个框架整合在一起出��C��一些异常：
log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).
log4j:WARN Please initialize the log4j system properly.
2009-7-25 0:31:38 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
[unknown location]
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:835)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadDocuments(XmlConfigurationProvider.java:131)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.init(XmlConfigurationProvider.java:100)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:130)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:205)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)
at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3709)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4363)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:926)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:889)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1149)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
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:585)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: Premature end of file. - [unknown location]
at com.opensymphony.xwork2.util.DomHelper.parse(DomHelper.java:123)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadConfigurationFiles(XmlConfigurationProvider.java:830)
... 34 more
Caused by: org.xml.sax.SAXParseException: Premature end of file.
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLScanner.reportFatalError(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:375)
at com.opensymphony.xwork2.util.DomHelper.parse(DomHelper.java:121)
... 35 more
2009-7-25 0:31:38 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2009-7-25 0:31:38 org.apache.catalina.core.StandardContext start
严重: Context [/ssh] startup failed due to previous errors
2009-7-25 0:31:38 org.apache.catalina.core.ApplicationContext log

使用log4j.properties 提示错误信息
2009-07-25 01:02:05 [org.springframework.web.context.ContextLoader]-[INFO] Root WebApplicationContext: initialization started
2009-07-25 01:02:05 [org.springframework.web.context.support.XmlWebApplicationContext]-[INFO] Refreshing org.springframework.web.context.support.XmlWebApplicationContext@19bd735: display name [Root WebApplicationContext]; startup date [Sat Jul 25 01:02:05 CST 2009]; root of context hierarchy
2009-07-25 01:02:05 [org.springframework.beans.factory.xml.XmlBeanDefinitionReader]-[INFO] Loading XML bean definitions from ServletContext resource [/WEB-INF/applicationContext.xml]
2009-07-25 01:02:06 [org.springframework.web.context.support.XmlWebApplicationContext]-[INFO] Bean factory for application context [org.springframework.web.context.support.XmlWebApplicationContext@19bd735]: org.springframework.beans.factory.support.DefaultListableBeanFactory@146df77
2009-07-25 01:02:06 [org.springframework.beans.factory.support.DefaultListableBeanFactory]-[INFO] Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@146df77: defining beans []; root of factory hierarchy
2009-07-25 01:02:06 [org.springframework.web.context.ContextLoader]-[INFO] Root WebApplicationContext: initialization completed in 1469 ms
2009-07-25 01:02:07 [com.opensymphony.xwork2.config.providers.XmlConfigurationProvider]-[INFO] Parsing configuration file [struts-default.xml]
2009-07-25 01:02:07 [com.opensymphony.xwork2.config.providers.XmlConfigurationProvider]-[INFO] Parsing configuration file [struts-plugin.xml]
2009-07-25 01:02:07 [com.opensymphony.xwork2.util.DomHelper]-[FATAL] Premature end of file. at (null:-1:-1)
org.xml.sax.SAXParseException: Premature end of file.
2009-07-25 01:02:07 [org.springframework.web.context.support.XmlWebApplicationContext]-[INFO] Closing org.springframework.web.context.support.XmlWebApplicationContext@19bd735: display name [Root WebApplicationContext]; startup date [Sat Jul 25 01:02:05 CST 2009]; root of context hierarchy
2009-07-25 01:02:07 [org.springframework.beans.factory.support.DefaultListableBeanFactory]-[INFO] Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@146df77: defining beans []; root of factory hierarchy

因�ؓ自己没有把struts.xml的文仉��|�好�Q�没有引入struts-default.xml的原因�?/p>

田园风光 2009-07-25 01:08 发表评论

用js获取FCKeditor的内容和判断内容是否为空

田园风光 — Thu, 23 Jul 2009 11:37:00 GMT

//取fck内容的长�?br /> function GetLength(str)
{
    var oEditor = FCKeditorAPI.GetInstance(str) ;
    var checkContent= oEditor.EditorDocument ;
    var contentLength ;

    if ( document.all )
    {
        contentLength= checkContent.body.innerText.trim().length ;
    }
    else
    {
        var r = checkContent.createRange() ;
        r.selectNodeContents( checkContent.body ) ;
        contentLength= r.toString().trim().length ;
    }
return contentLength
}

//判断是不是�ؓ�I?br /> function CheckPost(){
    if(GetLength("content")<=0)    //content为FCKeditor在页面所讄��名字
    {
      alert('误��入内�?);
        return false;
    }
}

//取fck内容
function GetContent(str)
{
     var oEditor = FCKeditorAPI.GetInstance(str) ;
     return oEditor.GetXHTML();
}

//��L��字符串的�I�格
String.prototype.trim = function()
{
             return this.replace(/(^[\s]*)|([\s]*$)/g, "");
}

田园风光 2009-07-23 19:37 发表评论

java.lang.NoSuchFieldError: deferredExpression

田园风光 — Sat, 18 Jul 2009 14:29:00 GMT

在��用jstl标签的出��C��q�样的异常：java.lang.NoSuchFieldError: deferredExpression
原因是：在lib目录下出��C��q�个不同版本的jstl标签�?br /> 解决�Ҏ��Q�把��q��本的jstl删除��可以了啊！

田园风光 2009-07-18 22:29 发表评论

退出登陆点后退�q�可以进�ȝ��解决办法

田园风光 — Fri, 10 Jul 2009 12:08:00 GMT

摘要: 阅读全文

田园风光 2009-07-10 20:08 发表评论

田园风光 — Sat, 04 Jul 2009 13:24:00 GMT

一、在��目中的配置�Q?br />              .在WebRoot/META-INF下徏context.xml文�g�Q�注意必��d��该目录下�Q?nbsp;


                                                                   name="jdbc/��目�? ---------------必须为项目名�Q�否则会有异�?br />                                    auth="Container"---------------------该项��Z��变项
                                   type="javax.sql.DataSource"---------该项��Z��变项
                                  driverClassName="com.mysql.jdbc.Driver"------------数据库驱动名
                                  url="jdbc:mysql://localhost:3306/haotian?autoReconnect=true"---url
                                  username="root"---------------------------------------用户�?br />                                   password="root"----------------------------------------密码
                                  maxActive="10"   ----------------------------最大连接数
                                  maxIdle="5"     -------------------------------最大空闲连接数
                                  maxWait="-1"/>   ------------------最大等待毫�U�数�Q?1为无限等�?br />
               在Tomcat6.0以后��׃��需要在web.xml中配�|�了�Q?br />
                                            DB Connection
                                             jdbc/blog
                                             javax.sql.DataSource
                                             Container


二、配�|�过�E�中遇到的异常及解决�Ҏ��Q?br />       (1)org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
        解决�Ҏ��Q�连接池的名字是name="jdbc/��目�?

      (2)org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'

        解决�Ҏ��Q�必��L��mysql的驱动包�Q�拷贝到tomcat/lib目录�?br />
     (3)javax.naming.NameNotFoundException: Name jdbc is not bound in this Context
         �q�个异常可能是��用tomcat6版本以下�Q�需要在��目的web.xml配置�Q?br />
                                            DB Connection
                                             jdbc/blog
                                             javax.sql.DataSource
                                             Container


以上是个人在开发过�E�中遇到的异常，在参考网友提供解军_��个�h实践�ȝ��所得�?br />

田园风光 2009-07-04 21:24 发表评论