第一个SSH的guestbook遇到的问题多多 (2)

1.
[ERROR] 2009-09-01 19:30:11 org.hibernate.proxy.BasicLazyInitializer - CGLIB Enhancement failed: com.zhao.model.User
net.sf.cglib.core.CodeGenerationException: java.lang.reflect.InvocationTargetException-->null
原因：
映射文件无
<hibernate-mapping>
    <class name="com.zhao.model.User" table="user" catalog="guestbook" lazy="false">
中的lazy="false"

2.
javax.servlet.ServletException: ids for this class must be manually assigned before calling save(): com.zhao.model.User; nested exception is org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): com.zhao.model.User
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

原因:id属性设成了  <property ~~~
要设成生成器的~~~
<id name="id" type="string" unsaved-value="null">
            <column name="id" sql-type="char(32)" />
            <generator class="uuid.hex"/>
</id>

3.
javax.servlet.ServletException: Request[/userLogin] does not contain handler parameter named 'method'.  This may be caused by whitespace in the label text.
org.apache.struts.actions.DispatchAction.unspecified(DispatchAction.java:222)
org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:256)

原因：是动态的action的form.jsp无method去指定方法

4.
javax.servlet.ServletException: Admin is not mapped. [from Admin where username=? and password=?]; nested exception is org.hibernate.hql.ast.QuerySyntaxException: Admin is not mapped. [from Admin where username=? and password=?]
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

原因：admin的hbm.xml未加入到配置中

5.
javax.servlet.ServletException: The given object has a null identifier:
org.springframework.dao.InvalidDataAccessApiUsageException: The given objec

原因：添加记录是应该用save(),而用了update()修改就会出现这个错误~~

6.
【错误】 This absolute uri http://java.sun.com/jsp/jstl/core) cannot be resolved in either web.xml or the jar files deployed with this application

原因：只是jstl相关的两个包无放入去lib~~~

7.
username: ${item.username} 时间：${item.datetime} 主题：${item.title}
内容：${item.content}
email: ${item.email} homepage: ${item.homepage} 
el表达式不显示
这并不与你的 EL 表达式相关，而是你的 JSTL 版本的问题。
解决方法有2个
1、将 <%@taglib prefix="c" uri="http://java.sun.com/jstl/core"%>
      更改为
        <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
2、使用JSTL的备用库，
      将 <%@taglib prefix="c" uri="http://java.sun.com/jstl/core"%>
      更改为
        <%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt"%>
或
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core_rt"%>
几种换下试一下

8.
[ERROR] 2009-09-02 10:29:08 org.apache.struts.actions.DispatchAction - Request[/guestbook] does not contain handler parameter named 'method'.  This may be caused by whitespace in the label text.
[ERROR] 2009-09-02 10:29:08 org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/guestbook2].[action] - Servlet.service() for servlet action threw exception
javax.servlet.ServletException: Request[/guestbook] does not contain handler parameter named 'method'.  This may be caused by whitespace in the label text.
at org.apache.struts.actions.DispatchAction.unspecified(DispatchAction.java:222)

http://127.0.0.1:8080/guestbook2/guestbook.do?userView 这样去调用
http://127.0.0.1:8080/guestbook2/guestbook.do?method=userView 应该这样

9.
<c:out value="${sessionScope['user.username']}"/>
会打印出 ap0406708
而单单是 ${sessionScope['user.username']} 就不能打印出ap0406708
记得在jsp中可打印出的
是加了struts标签的问题？？？？？？？？？？？？？？？？？？？？？

10.
Attribute value request.getParameter("id") is quoted with " which must be escaped when used within the value

<%@ page import =java.xxx.*; %>
java.xxx没有用"";上面是错误的写法.如下是正确的写法:
<%@ page import ="java.sql.*"; %>
xxx.jsp(X,Y) quote symbol expected 问题

当 <%@taglib prefix="s" uri=/struts-tags" %>这样写时会报一个quote symbol expected 异常。
这的问题主要是少写一个冒号了"”"
正确写法是:<%@taglib prefix="s" uri="/struts-tags" %>
注意第一个指令是没有写“的

引号出现的问题~~~这太烦了

11.
java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool

原因：无发现类~~~多数是包无加入~~

12.
org.apache.jasper.JasperException: /index.jsp(31,0) Unterminated &lt;c:url tag
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)

<a href="<c:url value="/form/adminLogin.jsp" />" >管理员登录</a><br/>
写成了
<a href="<c:url value="/form/adminLogin.jsp" >" >管理员登录</a><br/>
这样就会报错，标签无闭口。

13.
[ERROR] 2009-09-03 09:53:43 org.springframework.web.context.ContextLoader - Context initialization failed
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.SecurityException: class "org.apache.commons.collections.SequencedHashMap"'s signer information does not match signer information of other classes in the same package
Caused by:
java.lang.SecurityException: class "org.apache.commons.collections.SequencedHashMap"'s signer information does not match signer information of other classes in the same package
at java.lang.ClassLoader.checkCerts(Unknown Source)
at java.lang.ClassLoader.preDefineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1880)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:889)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1353)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1232)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at org.hibernate.mapping.Table.<init>(Table.java:33)
at org.hibernate.cfg.Mappings.addTable(Mappings.java:165)
at org.hibernate.cfg.HbmBinder.bindRootPersistentClassCommonValues(HbmBinder.java:299)
at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:282)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:153)
at org.hibernate.cfg.Configuration.add(Configuration.java:386)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:427)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:656)
at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:134)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1202)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1172)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:428)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:284)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:244)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:187)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3795)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4252)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:927)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:890)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1150)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:448)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
[ERROR] 2009-09-03 09:53:43 org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/guestbook2] - 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.SecurityException: class "org.apache.commons.collections.SequencedHashMap"'s signer information does not match signer information of other classes in the same package
Caused by:
java.lang.SecurityException: class "org.apache.commons.collections.SequencedHashMap"'s signer information does not match signer information of other classes in the same package
at java.lang.ClassLoader.checkCerts(Unknown Source)
at java.lang.ClassLoader.preDefineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1880)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:889)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1353)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1232)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at org.hibernate.mapping.Table.<init>(Table.java:33)
at org.hibernate.cfg.Mappings.addTable(Mappings.java:165)
at org.hibernate.cfg.HbmBinder.bindRootPersistentClassCommonValues(HbmBinder.java:299)
at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:282)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:153)
at org.hibernate.cfg.Configuration.add(Configuration.java:386)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:427)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:656)
at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:134)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1202)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1172)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:428)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:156)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:284)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:244)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:187)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3795)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4252)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:927)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:890)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1150)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:448)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)

原因：主要是commons-collections.jar包冲突
这里是因为把commons-collections.jar拉到了lib,直接删除lib中的commons-collections.jar(因为之前加入到lib中)就OK了

14.
数据库库添加时乱码~~~~
加了fitter，还是乱码，之后用System加到相关的处理方法中去看，发现是入数据库时乱码~~~
忘了为mysql的连接设编码方式~~~
<property name="url">
<value>jdbc:mysql://127.0.0.1:3306/guestbook?characterEncoding=UTF-8&amp;useUnicode=true</value>
</property>

15.
java.lang.NoSuchMethodException: com.zhao.action.GuestbookAction.guestView(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
at java.lang.Class.getMethod(Unknown Source)

原因：动态action中无方法 guestView

16.
String viewType=request.getParameter("viewType");
System.out.println(viewType);
System.out.println(viewType=="guestView");
System.out.println(viewType.equals("guestView"));

guestView
false
true

老问题了，字符串比较