[jira] Resolved: (JSPWIKI-465) JSP classloading does not work because of package name collision org.apache.jsp <=> org.apache.jspwiki

["Janne Jalkanen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JSPWIKI-465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Janne Jalkanen resolved JSPWIKI-465.
------------------------------------

    Resolution: Fixed

So we've now done the naming to "org.apache.wiki" as per JSPWIKI-38, so this one can be closed.

> JSP classloading does not work because of package name collision org.apache.jsp <=> org.apache.jspwiki
> ------------------------------------------------------------------------------------------------------
>
>                 Key: JSPWIKI-465
>                 URL: https://issues.apache.org/jira/browse/JSPWIKI-465
>             Project: JSPWiki
>          Issue Type: Bug
>          Components: Servlet Container/Java compatibility
>    Affects Versions: 3.0
>         Environment: JSPWiki 3.0.0-svn-41
>            Reporter: Harry Metske
>            Assignee: Harry Metske
>            Priority: Blocker
>             Fix For: 3.0
>
>
> JSPWiki is an incubating project in ASF, one of the required steps here is to move the java package naming from com.ecyrd.jspwiki to org.apache.jspwiki.
> After moving several classes to this new package we are seeing NoClassDeffoundErrors when classes are imported from JSP's
> "Normal"  servlets/classes work fine.
> After digging for a couple of days we found that the problem is caused by a bug in the JasperLoader classloader:
> http://svn.eu.apache.org/viewvc/tomcat/jasper/tc6.0.x/src/share/org/apache/jasper/servlet/JasperLoader.java?view=markup
> The following code snippet shows the failure :
> {noformat}
> 	if( !name.startsWith(Constants.JSP_PACKAGE_NAME) ) {
>             // Class is not in org.apache.jsp, therefore, have our
>             // parent load it
>             clazz = parent.loadClass(name);            
> 	    if( resolve )
> 		resolveClass(clazz);
> 	    return clazz;
> 	}
> {noformat}
> The constant Constants.JSP_PACKAGE_NAME is loaded as follows:
> {noformat}
>     /**
>      * The default package name for compiled jsp pages.
>      */
>     public static final String JSP_PACKAGE_NAME = 
>         System.getProperty("org.apache.jasper.Constants.JSP_PACKAGE_NAME", "org.apache.jsp");
> {noformat}
> Note the missing trailing dot !
> So there is a workaround by specifying the Java System Property  org.apache.jasper.Constants.TAG_FILE_PACKAGE_NAME=org.apache.somethingelse
> However, this workaround is only available since revision 441109 of Tomcat 6.
> ( http://svn.eu.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/jasper/Constants.java?r1=423920&r2=441109&diff_format=h )
> A bug has been filed for the Tomcat team at : https://issues.apache.org/bugzilla/show_bug.cgi?id=46462

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