[Bug 54964] New: Class loading issue of "TagPlugin" in TagPluginManager

[bugzilla]

https://issues.apache.org/bugzilla/show_bug.cgi?id=54964

            Bug ID: 54964
           Summary: Class loading issue of "TagPlugin" in TagPluginManager
           Product: Tomcat 7
           Version: 7.0.40
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Jasper
          Assignee: dev@tomcat.apache.org
          Reporter: xs...@ebay.com
    Classification: Unclassified

Created attachment 30281
  --> https://issues.apache.org/bugzilla/attachment.cgi?id=30281&action=edit
Patch for TagPluginManager.java

TagPluginManager is using "Class.forName" to load extensions of TagPlugin.
It can't work when these extensions are put under the WEB-INF/lib.

Here is the code,

            String pluginClassStr = pluginClassNode.getBody();
            TagPlugin tagPlugin = null;
            try {
                Class<?> pluginClass = Class.forName(pluginClassStr);
                tagPlugin = (TagPlugin) pluginClass.newInstance();
            } catch (Exception e) {
                throw new JasperException(e);
            }

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