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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 33358] New: - jasper2 bug because classloader-problems
Date Wed, 02 Feb 2005 14:44:32 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=33358

           Summary: jasper2 bug because classloader-problems
           Product: Tomcat 5
           Version: 5.0.30
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Jasper
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: marco@morca.de


hi there, 
 
i think the patch of bugreport 
http://issues.apache.org/bugzilla/show_bug.cgi?id=32330 is not correct. 
jspc get an error if i compile jsp's with struts-el tags like 
<html-el:option>. 
following stacktrace is coming: 
  [jasper2] SCHWERWIEGEND: MessageResourcesFactory.createFactory 
  [jasper2] java.lang.ClassNotFoundException: 
org.apache.struts.util.PropertyMessageResourcesFactory 
  [jasper2]     at java.net.URLClassLoader$1.run(URLClassLoader.java:199) 
  [jasper2]     at java.security.AccessController.doPrivileged(Native Method) 
  [jasper2]     at java.net.URLClassLoader.findClass(URLClassLoader.java:187) 
  [jasper2]     at java.lang.ClassLoader.loadClass(ClassLoader.java:289) 
  [jasper2]     at java.lang.ClassLoader.loadClass(ClassLoader.java:235) 
  [jasper2]     at 
org.apache.struts.util.RequestUtils.applicationClass(RequestUtils.java:117) 
  [jasper2]     at 
org.apache.struts.util.MessageResourcesFactory.createFactory(MessageResourcesFactory.java:148)

  [jasper2]     at 
org.apache.struts.util.MessageResources.getMessageResources(MessageResources.java:493) 
  [jasper2]     at 
org.apache.struts.taglib.html.BaseHandlerTag.<clinit>(BaseHandlerTag.java:64) 
  [jasper2]     at java.lang.Class.forName0(Native Method) 
  [jasper2]     at java.lang.Class.forName(Class.java:141) 
  [jasper2]     at 
org.apache.strutsel.taglib.html.ELLinkTagBeanInfo.class$(ELLinkTagBeanInfo.java:46) 
  [jasper2]     at 
org.apache.strutsel.taglib.html.ELLinkTagBeanInfo.getPropertyDescriptors(ELLinkTagBeanInfo.java:46)

  [jasper2]     at 
java.beans.Introspector.getTargetPropertyInfo(Introspector.java:459) 
  [jasper2]     at java.beans.Introspector.getBeanInfo(Introspector.java:372) 
  [jasper2]     at java.beans.Introspector.getBeanInfo(Introspector.java:144) 
  [jasper2]     at 
org.apache.jasper.compiler.Generator$TagHandlerInfo.<init>(Generator.java:3684) 
  [jasper2]     at 
org.apache.jasper.compiler.Generator$GenerateVisitor.getTagHandlerInfo(Generator.java:2102)

  [jasper2]     at 
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1583) 
  [jasper2]     at 
org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1441) 
  [jasper2]     at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163) 
  [jasper2]     at 
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213) 
  [jasper2]     at 
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1689) 
  [jasper2]     at 
org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1441) 
  [jasper2]     at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163) 
  [jasper2]     at 
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213) 
  [jasper2]     at 
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219) 
  [jasper2]     at org.apache.jasper.compiler.Node$Root.accept(Node.java:456) 
  [jasper2]     at org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163) 
  [jasper2]     at 
org.apache.jasper.compiler.Generator.generate(Generator.java:3272) 
  [jasper2]     at 
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:244) 
  [jasper2]     at 
org.apache.jasper.compiler.Compiler.compile(Compiler.java:470) 
  [jasper2]     at org.apache.jasper.JspC.processFile(JspC.java:805) 
  [jasper2]     at org.apache.jasper.JspC.execute(JspC.java:938) 
... 
in the source code of Jspc.java the finaly-block in the processFile method for 
resetting the classloader is wrong there. because 
it resets the classloader after the first file was processed. and any other 
jsp's, that uses 
the struts-el-tags (for example <html-el:option...) can not be compiled. i 
think the finaly-block belongs 
to the end of the execute-method with following change: 
        } finally { 
            if(originalClassLoader != null) { 
                Thread.currentThread().setContextClassLoader(originalClassLoader); 
                loader = null; // set to null!! 
            } 
        } 
where originalClassLoader is declared as instance variable as: 
private ClassLoader originalClassLoader = null; 
 
what's your opinion? 
 
marco

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