Re: Plugin ClassCastException

Sun, 21 Sep 2008 04:33:29 -0700
In that case my guess is that your classpath contains two copies of JSPWiki.jar with different versions... Or, that Eclipse is using a different version of JSPWiki.jar than your actual instance of JSPWiki. 

/Janne

On 21 Sep 2008, at 14:25, Benedikt Mohrmann wrote:


Hi,

I already do so.
As a test, I just tried the following class:


import com.ecyrd.jspwiki.WikiContext;
import com.ecyrd.jspwiki.plugin.PluginException;
import com.ecyrd.jspwiki.plugin.WikiPlugin;


public class ReadRoomStructurePlugin implements WikiPlugin {

   public String execute(WikiContext context, Map params)
           throws PluginException {
       // TODO Auto-generated method stub
       return "x";
   }

}


Same error as before!

Regards
Benedikt


Janne Jalkanen schrieb:


You must implement the WikiPlugin interface.

public class ReadRoomStructurePlugin implements WikiPlugin
{
...
}

/Janne

On 21 Sep 2008, at 14:07, Benedikt Mohrmann wrote:


Hi,

I already developed a plugin, which works quite well.

Now I tried to develope a new one, export it via Eclipse as  
a .jar file, but when I visit the page, where it should be  
inserted I get the error:
"Instanziierung des Plugins 'ReadRoomStructurePlugin'  
fehlgeschlagen."

English: "Instantiation of Plugin 'ReadRoomStructurePlugin' failed.

The Stacktrace says:


2008-09-21 12:48:18,421 [http-localhost%2F127.0.0.1-8080-1] INFO  
com.ecyrd.jspwiki.plugin.PluginManager JSPWiki:/JSPWiki/  
JSPWiki:http://localhost:8080/JSPWiki/ - Cannot initialize plugin  
ReadRoomStructurePlugin
java.lang.ClassCastException: ReadRoomStructurePlugin cannot be  
cast to com.ecyrd.jspwiki.plugin.WikiPlugin
   at com.ecyrd.jspwiki.plugin.PluginManager 
$WikiPluginInfo.newPluginInstance(PluginManager.java:868)
   at com.ecyrd.jspwiki.plugin.PluginManager 
$WikiPluginInfo.initializePlugin(PluginManager.java:794)
   at com.ecyrd.jspwiki.plugin.PluginManager.registerPlugin 
(PluginManager.java:683)
   at com.ecyrd.jspwiki.plugin.PluginManager.execute 
(PluginManager.java:348)
   at com.ecyrd.jspwiki.forms.FormOutput.execute(FormOutput.java: 
127)
   at com.ecyrd.jspwiki.plugin.PluginManager.execute 
(PluginManager.java:383)
   at com.ecyrd.jspwiki.parser.PluginContent.getText 
(PluginContent.java:158)
   at org.jdom.output.XMLOutputter.printTextRange 
(XMLOutputter.java:1054)
   at org.jdom.output.XMLOutputter.printElement(XMLOutputter.java: 
934)
   at org.jdom.output.XMLOutputter.printContentRange 
(XMLOutputter.java:1007)
   at org.jdom.output.XMLOutputter.outputElementContent 
(XMLOutputter.java:445)
   at com.ecyrd.jspwiki.render.XHTMLRenderer.getString 
(XHTMLRenderer.java:63)
   at com.ecyrd.jspwiki.render.RenderingManager.getHTML 
(RenderingManager.java:258)
   at com.ecyrd.jspwiki.render.RenderingManager.getHTML 
(RenderingManager.java:299)

   at com.ecyrd.jspwiki.WikiEngine.textToHTML(WikiEngine.java:1469)
   at com.ecyrd.jspwiki.WikiEngine.getHTML(WikiEngine.java:1411)

   at com.ecyrd.jspwiki.tags.InsertPageTag.doWikiStartTag 
(InsertPageTag.java:128)
   at com.ecyrd.jspwiki.tags.WikiTagBase.doStartTag 
(WikiTagBase.java:89)
   at  
org.apache.jsp.templates.default_.PageTab_jsp._jspx_meth_wiki_005fIn 
sertPage_005f0(PageTab_jsp.java:677)
   at org.apache.jsp.templates.default_.PageTab_jsp._jspService 
(PageTab_jsp.java:277)
   at org.apache.jasper.runtime.HttpJspBase.service 
(HttpJspBase.java:70)

   at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

   at org.apache.jasper.servlet.JspServletWrapper.service 
(JspServletWrapper.java:373)
   at org.apache.jasper.servlet.JspServlet.serviceJspFile 
(JspServlet.java:336)
   at org.apache.jasper.servlet.JspServlet.service 
(JspServlet.java:265)

   at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

   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:654)
   at org.apache.catalina.core.ApplicationDispatcher.doInclude 
(ApplicationDispatcher.java:557)
   at org.apache.catalina.core.ApplicationDispatcher.include 
(ApplicationDispatcher.java:481)
   at org.apache.jasper.runtime.JspRuntimeLibrary.include 
(JspRuntimeLibrary.java:968)
   at org.apache.jasper.runtime.PageContextImpl.include 
(PageContextImpl.java:609)

   at com.ecyrd.jspwiki.tags.IncludeTag.doEndTag(IncludeTag.java:84)

   at  
org.apache.jsp.templates.default_.PageContent_jsp._jspx_meth_wiki_00 
5fInclude_005f0(PageContent_jsp.java:442)
   at  
org.apache.jsp.templates.default_.PageContent_jsp._jspService 
(PageContent_jsp.java:148)
   at org.apache.jasper.runtime.HttpJspBase.service 
(HttpJspBase.java:70)

   at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

   at org.apache.jasper.servlet.JspServletWrapper.service 
(JspServletWrapper.java:373)
   at org.apache.jasper.servlet.JspServlet.serviceJspFile 
(JspServlet.java:336)
   at org.apache.jasper.servlet.JspServlet.service 
(JspServlet.java:265)

   at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

   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:654)
   at org.apache.catalina.core.ApplicationDispatcher.doInclude 
(ApplicationDispatcher.java:557)
   at org.apache.catalina.core.ApplicationDispatcher.include 
(ApplicationDispatcher.java:481)
   at org.apache.jasper.runtime.JspRuntimeLibrary.include 
(JspRuntimeLibrary.java:968)
   at org.apache.jasper.runtime.PageContextImpl.include 
(PageContextImpl.java:609)
   at com.ecyrd.jspwiki.tags.ContentTag.doEndTag(ContentTag.java: 
126)
   at  
org.apache.jsp.templates.default_.ViewTemplate_jsp._jspx_meth_wiki_0 
05fContent_005f0(ViewTemplate_jsp.java:566)
   at  
org.apache.jsp.templates.default_.ViewTemplate_jsp._jspService 
(ViewTemplate_jsp.java:142)
   at org.apache.jasper.runtime.HttpJspBase.service 
(HttpJspBase.java:70)

   at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

   at org.apache.jasper.servlet.JspServletWrapper.service 
(JspServletWrapper.java:373)
   at org.apache.jasper.servlet.JspServlet.serviceJspFile 
(JspServlet.java:336)
   at org.apache.jasper.servlet.JspServlet.service 
(JspServlet.java:265)

   at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

   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:654)
   at org.apache.catalina.core.ApplicationDispatcher.doInclude 
(ApplicationDispatcher.java:557)
   at org.apache.catalina.core.ApplicationDispatcher.include 
(ApplicationDispatcher.java:481)
   at org.apache.jasper.runtime.JspRuntimeLibrary.include 
(JspRuntimeLibrary.java:968)
   at org.apache.jasper.runtime.PageContextImpl.include 
(PageContextImpl.java:609)

   at com.ecyrd.jspwiki.tags.IncludeTag.doEndTag(IncludeTag.java:84)
   at org.apache.jsp.Wiki_jsp._jspService(Wiki_jsp.java:114)

   at org.apache.jasper.runtime.HttpJspBase.service 
(HttpJspBase.java:70)

   at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

   at org.apache.jasper.servlet.JspServletWrapper.service 
(JspServletWrapper.java:373)
   at org.apache.jasper.servlet.JspServlet.serviceJspFile 
(JspServlet.java:336)
   at org.apache.jasper.servlet.JspServlet.service 
(JspServlet.java:265)

   at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

   at  
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter 
(ApplicationFilterChain.java:290)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter 
(ApplicationFilterChain.java:206)
   at com.ecyrd.jspwiki.ui.WikiServletFilter.doFilter 
(WikiServletFilter.java:99)
   at com.ecyrd.jspwiki.ui.WikiJSPFilter.doFilter 
(WikiJSPFilter.java:91)
   at  
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter 
(ApplicationFilterChain.java:235)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter 
(ApplicationFilterChain.java:206)
   at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter 
(ReplyHeaderFilter.java:96)
   at  
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter 
(ApplicationFilterChain.java:235)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter 
(ApplicationFilterChain.java:206)
   at org.apache.catalina.core.StandardWrapperValve.invoke 
(StandardWrapperValve.java:230)
   at org.apache.catalina.core.StandardContextValve.invoke 
(StandardContextValve.java:175)
   at  
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke 
(SecurityAssociationValve.java:182)
   at org.jboss.web.tomcat.security.JaccContextValve.invoke 
(JaccContextValve.java:84)
   at org.apache.catalina.core.StandardHostValve.invoke 
(StandardHostValve.java:127)
   at org.apache.catalina.valves.ErrorReportValve.invoke 
(ErrorReportValve.java:102)
   at  
org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke 
(CachedConnectionValve.java:157)
   at org.apache.catalina.core.StandardEngineValve.invoke 
(StandardEngineValve.java:109)
   at org.apache.catalina.connector.CoyoteAdapter.service 
(CoyoteAdapter.java:262)
   at org.apache.coyote.http11.Http11Processor.process 
(Http11Processor.java:844)
   at org.apache.coyote.http11.Http11Protocol 
$Http11ConnectionHandler.process(Http11Protocol.java:583)
   at org.apache.tomcat.util.net.JIoEndpoint$Worker.run 
(JIoEndpoint.java:446)

   at java.lang.Thread.run(Unknown Source)


Any idea, why it is not able to cast ?

Regards
Benedikt


























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