Question

我正在尝试将Struts 2框架用于我的Google App Engine项目。我已正确配置了struts框架，并在 struts-config.xml 文件中创建了一个操作：

<package name="myproj" namespace="/myproj" extends="struts-default">
  <action name="login">
  <result>/login.jsp</result>
</action>

我正试图通过http://localhost:8080/myproj/login.action访问上述操作。但是我没有按预期获得我的login.jsp页面。相反，我收到以下错误。

HTTP ERROR 500

Problem accessing /myproj/login.action. Reason:

    java.lang.NoClassDefFoundError: javax.swing.tree.TreeNode is a restricted class. Please see the Google  App Engine developer's guide for more details.
Caused by:

javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax.swing.tree.TreeNode is a restricted class. Please see the Google  App Engine developer's guide for more details.
    at org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
    at org.apache.jasper.runtime.PageContextImpl.access$1100(PageContextImpl.java:64)
    at org.apache.jasper.runtime.PageContextImpl$12.run(PageContextImpl.java:745)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:743)
    at org.apache.jsp.getin_jsp._jspService(getin_jsp.java:102)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
    at com.google.appengine.tools.development.PrivilegedJspServlet.access$101(PrivilegedJspServlet.java:23)
    at com.google.appengine.tools.development.PrivilegedJspServlet$2.run(PrivilegedJspServlet.java:59)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.appengine.tools.development.PrivilegedJspServlet.service(PrivilegedJspServlet.java:57)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)

我是否需要配置一些东西来修复上述错误并使Struts 2框架在Google App Engine上运行？

Answer 1

我在Appengine Groups发现了这个问题：http://groups.google.com/group/google-appengine-java/browse_thread/thread/dd84e44f604498c4

当然，您必须关注Will it play on GAE

中的链接

Answer 2

您可以关注我的博客教程http://whyjava.wordpress.com/2009/08/30/creating-struts2-application-on-google-app-engine-gae/，其中包含您需要的所有信息。

Answer 3

在Struts 2.3.24中使用了最新版本的FreeMarker - 2.3.22，上述解决方案不再适用。相反，有一个专用的FreeMarker版本可以与AppEngine一起使用，可以添加到pom中，如下所示：

  <dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-core</artifactId>
    <version>${struts2.version}</version>
    <exclusions>
      <exclusion>
        <artifactId>freemarker</artifactId>
        <groupId>org.freemarker</groupId>
      </exclusion>
    </exclusions>
  </dependency>

  <dependency>
    <groupId>org.freemarker</groupId>
    <artifactId>freemarker-gae</artifactId>
    <version>2.3.22</version>
  </dependency>

Google App Engine（Java）上的Struts 2问题 - javax.swing.tree.TreeNode是一个受限制的类

3 个答案: