如何让Spring与Wicket玩得很好？ （ContextLoaderListener问题）

时间：2011-06-28 10:19:04

标签： java spring tomcat wicket

据我所知，根据我发现的说明（如this和this too），我需要在web.xml中为Spring工作：

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

在我的Wicket应用程序类中，我有：

public class MyApplication extends WebApplication {

    @Override
    protected void init() {
        super.init();    
        addComponentInstantiationListener(new SpringComponentInjector(this));
    }

    @Override
    public Class<? extends Page> getHomePage() {
        return HelloWorldPage.class;
    }
}

问题是，每当我在web.xml中使用ContextLoaderListener时，Wicket都无法启动。我只得到404错误（或空白页面），以及控制台输出如：

SEVERE: Error listenerStart
Jun 28, 2011 12:49:04 PM org.apache.catalina.util.SessionIdGenerator createSecureRandom
INFO: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [1,973] milliseconds.
Jun 28, 2011 12:49:04 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [] startup failed due to previous errors
Jun 28, 2011 12:49:04 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [] registered the JDBC driver [org.hsqldb.jdbc.JDBCDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Jun 28, 2011 12:49:04 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Jun 28, 2011 12:49:04 PM org.apache.catalina.startup.HostConfig deployDirectory

我正在使用这两个框架的最新版本（Wicket 1.4.17和Spring 3.0.5）和Tomcat 7来运行它们（Tomcat 6也是如此）。另外，我在WEB-INF / lib中有以下jar。什么遗失或太多了？

antlr-2.7.6.jar                        log4j-1.2.16.jar              spring-web-3.0.5.jar
commons-collections-3.1.jar            mysql-connector-5.1.10.jar    slf4j-api-1.6.1.jar
dom4j-1.6.1.jar                        spring-beans-3.0.5.jar        slf4j-log4j12-1.6.1.jar
guava-r09.jar                          spring-context-3.0.5.jar      wicket-1.4.17.jar
hibernate-3.6.5.jar                    spring-core-3.0.5.jar         wicket-auth-roles-1.4.17.jar
hibernate-jpa-2.0-api-1.0.0.Final.jar  spring-jdbc-3.0.5.jar         wicket-datetime-1.4.17.jar
hsqldb.jar                             spring-orm-3.0.5.jar          wicket-ioc-1.4.17.jar
javassist-3.12.0.GA.jar                spring-test-3.0.5.jar         wicket-spring-1.4.17.jar
jta-1.1.jar                            spring-transaction-3.0.5.jar  wicketstuff-annotation-1.4.17.2.jar

web.xml的其余部分（我尝试使用servlet和filter设置Wicket;没有区别）：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">

    <display-name>My App</display-name>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

    <context-param>
        <param-name>configuration</param-name>
        <param-value>development</param-value>
    </context-param>

    <filter>
        <filter-name>MyApp</filter-name>
        <filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>
        <init-param>
            <param-name>applicationClassName</param-name>
            <param-value>com.acme.MyApplication</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>MyApp</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

     <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

</web-app>

谷歌搜索我发现someone with the same problem，但没有解决方案。

有趣的是，我之前有过很好的Spring和Wicket合作，设置非常相似。有什么想法吗？

3 个答案:

答案 0 :(得分：0)

这是我项目的配置：

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">

    <!-- Spring context config location(s) -->
    <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
        /WEB-INF/applicationContext.xml
    </param-value>
    </context-param>  

    <display-name>afrodite</display-name>

    <!-- used by Log4jConfigListener -->
    <context-param>
    <param-name>webAppRootKey</param-name>
    <param-value>afrodite.root</param-value>
    </context-param>     

    <context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>/WEB-INF/log4j.properties</param-value>
    </context-param>   

    <filter>
    <filter-name>openSessionInView</filter-name>
    <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
    </filter>

    <filter>
    <filter-name>afrodite-app</filter-name>
    <filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>
    <init-param>
        <param-name>applicationClassName</param-name>
        <param-value>info.afrodite.wicket.AfroditeApplication</param-value>
    </init-param>
    <init-param>
        <param-name>configuration</param-name>
        <param-value>DEPLOYMENT</param-value>
    </init-param>
    </filter>    

    <!-- open session should be above the wicket filter -->
    <filter-mapping>
    <filter-name>openSessionInView</filter-name>
    <url-pattern>/app/*</url-pattern>
    </filter-mapping>     

    <filter-mapping>
    <filter-name>afrodite-app</filter-name>
    <url-pattern>/app/*</url-pattern>
    </filter-mapping>           

    <listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>

    <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <servlet>
    <servlet-name>afrodite-api</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>2</load-on-startup>
    </servlet>

    <servlet-mapping>
    <servlet-name>afrodite-api</servlet-name>
    <url-pattern>/api/*</url-pattern>
    </servlet-mapping>    

    <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    </welcome-file-list>

</web-app>

希望这会有所帮助。

答案 1 :(得分：0)

请检查 contextConfigLocation 。 param-value 应为 classpath *：applicationContext.xml 。请在我的示例中检查侦听器配置。希望我帮忙！

这是我的web.xml配置很好用：

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
     version="2.4">

    <display-name>mywebapp</display-name>

    <filter>
        <filter-name>springRequestContextFilter</filter-name>
        <filter-class>org.springframework.web.filter.RequestContextFilter</filter-class>
    </filter>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            classpath*:applicationContext.xml
        </param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <listener>
        <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
    </listener>

    <filter>
        <filter-name>wicket.mywebapp</filter-name>
        <filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>
        <init-param>
            <param-name>applicationClassName</param-name>
            <param-value>com.company.example.web.MyApplication</param-value>
        </init-param>
    </filter>

        <!-- Enables Spring Security -->
    <filter>
        <filter-name>filterChainProxy</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    </filter>

    <filter-mapping>
      <filter-name>filterChainProxy</filter-name>
      <url-pattern>/*</url-pattern>
    </filter-mapping>

 <filter-mapping>
  <filter-name>wicket.mywebapp</filter-name>
    <url-pattern>/*</url-pattern>
 </filter-mapping>

</web-app>

答案 2 :(得分：0)

编辑：稍后我意识到根本问题很可能是缺少日志配置。在我们的例子中（使用带有log4j的SLF4J），在log4j.properties中添加适当的配置后，各种警告＆amp;即使使用Tomcat，库记录的错误也变得可见。

我尝试了 Jetty 而不是 Tomcat ，并开始获得更好的错误消息。事实证明，有几个库缺失 - 我已经使用过的一些库所需的东西。

2011-06-28 15:57:01.879:WARN::Unable to reach node goal: started
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:184)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
    at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:640)

一些libs显然需要commons-logging，我补充说。下一个：

java.lang.NoClassDefFoundError: org/springframework/asm/ClassVisitor
    at org.springframework.context.support.AbstractRefreshableApplicationContext.customizeBeanFactory(AbstractRefreshableApplicationContext.java:218)

添加了spring-asm。下一个：

org.springframework.beans.factory.BeanDefinitionStoreException: 
  Unexpected exception parsing XML document from class path resource [applicationContext.xml]; 
  nested exception is java.lang.NoClassDefFoundError: org/springframework/aop/config/AopNamespaceUtils

添加了spring-aop。接下来的事情不那么直截了当：

org.springframework.beans.factory.BeanDefinitionStoreException: 
  Unexpected exception parsing XML document from class path resource [applicationContext.xml]; 
  nested exception is java.lang.NoClassDefFoundError: org/aopalliance/intercept/MethodInterceptor

在Spring blog comments中找到关于缺失aopalliance的讨论。显然它已从spring-aop中完全删除，你需要获得aopalliance.jar from sourceforge。

（我认为这种沼泽最糟糕的是Java EE：我不知道spring-asm或spring-aop更不用说aopalliance了，但显然我需要它们。 -P）

所以，添加了aopalliance.jar。后来我仍然需要添加spring-expression和cglib-2.2（它带有Hibernate）。

之后，我的Spring / Hibernate持久层配置存在一些问题，但它们超出了这个问题的范围。否则Wicket＆amp; Spring现在可以很好地工作（例如，在Wicket页面上注入服务层对象）。

我认为这样做的一个道理是，在某些情况下，Tomcat会播放有用的错误消息，而Jetty可能更适合调试。另外，使用Maven可能有点帮助了依赖地狱（但它也没有问题）。

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