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From "Harry Metske (JIRA)" <j...@apache.org>
Subject [jira] Created: (JSPWIKI-447) InstantiationException in PluginManager
Date Sun, 30 Nov 2008 13:31:44 GMT
InstantiationException in PluginManager
---------------------------------------

                 Key: JSPWIKI-447
                 URL: https://issues.apache.org/jira/browse/JSPWIKI-447
             Project: JSPWiki
          Issue Type: Bug
          Components: Plugins
    Affects Versions: 2.8.1, 2.8, 2.8.2, 3.0
         Environment: N/A
            Reporter: Harry Metske
            Assignee: Harry Metske
            Priority: Minor
             Fix For: 3.0


During startup the PluginManager throws the following Exceptions :

2008-11-30 13:33:23,443 [main] INFO com.ecyrd.jspwiki.plugin.PluginManager  - Cannot initialize
plugin com.ecyrd.jspwiki.forms.FormElement
java.lang.InstantiationException
       at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:30)
       at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
       at java.lang.Class.newInstance0(Class.java:355)
       at java.lang.Class.newInstance(Class.java:308)
       at com.ecyrd.jspwiki.plugin.PluginManager$WikiPluginInfo.newPluginInstance(PluginManager.java:798)
       at com.ecyrd.jspwiki.plugin.PluginManager$WikiPluginInfo.initializePlugin(PluginManager.java:897)
       at com.ecyrd.jspwiki.plugin.PluginManager.registerPlugin(PluginManager.java:692)
       at com.ecyrd.jspwiki.plugin.PluginManager.registerAllPlugins(PluginManager.java:718)
       at com.ecyrd.jspwiki.plugin.PluginManager.<init>(PluginManager.java:199)
       at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
       at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
       at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
       at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
       at com.ecyrd.jspwiki.util.ClassUtil.getMappedObject(ClassUtil.java:277)
       at com.ecyrd.jspwiki.util.ClassUtil.getMappedObject(ClassUtil.java:229)
       at com.ecyrd.jspwiki.WikiEngine.initialize(WikiEngine.java:531)
       at com.ecyrd.jspwiki.WikiEngine.<init>(WikiEngine.java:400)
       at com.ecyrd.jspwiki.WikiEngine.getInstance(WikiEngine.java:341)
       at com.ecyrd.jspwiki.ui.WikiServletFilter.init(WikiServletFilter.java:80)
       at com.ecyrd.jspwiki.ui.WikiJSPFilter.init(WikiJSPFilter.java:76)
       at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)
       at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)
       at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
       at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3709)
       at org.apache.catalina.core.StandardContext.start(StandardContext.java:4356)
       at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
       at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
       at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
       at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:924)
       at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:887)
       at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
       at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1147)
       at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
       at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
       at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
       at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
       at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
       at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
       at org.apache.catalina.core.StandardService.start(StandardService.java:516)
       at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
       at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:597)
       at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
       at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

This is done for :


metskem@blackpearl:/var/jspwiki/log$ grep 'Cannot initialize plugin' jspwiki.log 
2008-11-28 20:20:37,433 [main] INFO com.ecyrd.jspwiki.plugin.PluginManager  - Cannot initialize
plugin com.ecyrd.jspwiki.plugin.AbstractReferralPlugin
2008-11-28 20:20:37,621 [main] INFO com.ecyrd.jspwiki.plugin.PluginManager  - Cannot initialize
plugin com.ecyrd.jspwiki.forms.FormElement
2008-11-28 20:20:37,631 [main] INFO com.ecyrd.jspwiki.plugin.PluginManager  - Cannot initialize
plugin com.ecyrd.jspwiki.plugin.WikiPlugin


The PluginManager user the Stripes Resolver Utility to find implementations of WikiPlugin:

resolver.findImplementations( WikiPlugin.class, paths );

This list also includes Interfaces and abstract classes, those should be excluded from registering.

Fix is being worked on

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