Eclipse-CVS中的ClassNotFoundException

Question

我命名的Liferay工程Project A依赖于从CVS repossitory另一个项目命名为Project B ，

每次我在Project B这是CVS的项目）中使用类时，都会得到此ClassNotFoundException 。 我不明白为什么，我还包括了Project B在我的项目的构建路径，但不起作用。

请帮助我，如何使用资源库中的项目内部的类？ 这是引发的exception的Stack Trace ：

05:28:44,714 ERROR [jsp:154] java.lang.ClassNotFoundException: com.fluxion.profileservice.DAOImpl.EnrolledCustomerDAOImpl
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
    at com.fluxion.myaccounts.service.EnrolledCustomerService.getCustomerIDList(EnrolledCustomerService.java:10)
    at com.fluxion.myaccounts.portlet.OrderTaggingPortlet.doView(OrderTaggingPortlet.java:43)
    at javax.portlet.GenericPortlet.doDispatch(GenericPortlet.java:328)
    at javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
    at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:101)
    at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:64)
    at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:92)
    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 org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
    at com.liferay.portlet.InvokerPortletImpl.invoke(InvokerPortletImpl.java:638)
    at com.liferay.portlet.InvokerPortletImpl.invokeRender(InvokerPortletImpl.java:723)
    at com.liferay.portlet.InvokerPortletImpl.render(InvokerPortletImpl.java:425)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

05:28:49,669 ERROR [jsp:154] java.lang.NoClassDefFoundError: com/fluxion/profileservice/DAOImpl/EnrolledCustomerDAOImpl
    at com.fluxion.myaccounts.service.EnrolledCustomerService.getCustomerIDList(EnrolledCustomerService.java:10)
    at com.fluxion.myaccounts.portlet.OrderTaggingPortlet.doView(OrderTaggingPortlet.java:43)
    at javax.portlet.GenericPortlet.doDispatch(GenericPortlet.java:328)
    at javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
    at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:101)
    at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:64)
    at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:92)
    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 org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
    at com.liferay.portlet.InvokerPortletImpl.invoke(InvokerPortletImpl.java:638)
    at com.liferay.portlet.InvokerPortletImpl.invokeRender(InvokerPortletImpl.java:723)
    at com.liferay.portlet.InvokerPortletImpl.render(InvokerPortletImpl.java:425)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)

Loading file:/C:/liferay-portal-tomcat-6.0.6-20110225/liferay-portal-6.0.6/tomcat-6.0.29/webapps/chat-portlet/WEB-INF/classes/portlet.properties
05:28:49,777 INFO  [PluginPackageUtil:1230] Checking for available updates
05:28:49,780 INFO  [PluginPackageUtil:1274] Finished checking for available updates in 2 ms
05:32:02,296 ERROR [jsp:154] java.lang.NoClassDefFoundError: com/fluxion/profileservice/DAOImpl/EnrolledCustomerDAOImpl
    at com.fluxion.myaccounts.service.EnrolledCustomerService.getCustomerIDList(EnrolledCustomerService.java:10)
    at com.fluxion.myaccounts.portlet.OrderTaggingPortlet.doView(OrderTaggingPortlet.java:43)
    at javax.portlet.GenericPortlet.doDispatch(GenericPortlet.java:328)
    at javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
    at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:101)
    at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:64)
    at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:92)
    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 org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
    at com.liferay.portlet.InvokerPortletImpl.invoke(InvokerPortletImpl.java:638)
    at com.liferay.portlet.InvokerPortletImpl.invokeRender(InvokerPortletImpl.java:723)
    at com.liferay.portlet.InvokerPortletImpl.render(InvokerPortletImpl.java:425)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)

Answer 1

问题在于，项目B中的类在编译期间可访问，但在运行时无法访问。 要使此工作正常，您可以采用以下几种方法：

1. Simpy：将两个项目放到一个项目中。 这是最简单的方法，您可以在一个项目中放置多个portlet和钩子。 一个类加载器将比您加载的所有类都要多。

2. 如果需要共享类，则将由多个项目加载-创建一个仅包含Java类的项目（不包含portlet.xml等门户配置）。 将此共享项目导出到jar文件，然后将jar文件放在docroot/WEB-INF/lib文件夹中的其他项目中（例如Project A）。 如果共享类具有共享状态，则将jar文件唯一地放置到tomcat共享文件夹中，例如tomcat/lib/ext/