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List:       jboss-cvs-commits
Subject:    [jboss-cvs] jmx/src/main/org/jboss/mx/loading ClassLoaderUtils.java
From:       Scott M Stark <starksm () users ! sourceforge ! net>
Date:       2002-10-31 7:49:44
[Download RAW message or body]

  User: starksm 
  Date: 02/10/30 23:49:44

  Modified:    src/main/org/jboss/mx/loading Tag: Branch_3_0
                        ClassLoaderUtils.java
  Log:
  - Add a displayClassInfo utility method that prints a complete description
  of a class, its interfaces, code source and class loader heirarchy.
  - Log any package for which more than one class loader exists as this
  may indicate a problem with duplicate classes
  
  Revision  Changes    Path
  No                   revision
  
  
  No                   revision
  
  
  1.1.2.5   +81 -2     jmx/src/main/org/jboss/mx/loading/ClassLoaderUtils.java
  
  Index: ClassLoaderUtils.java
  ===================================================================
  RCS file: /cvsroot/jboss/jmx/src/main/org/jboss/mx/loading/ClassLoaderUtils.java,v
  retrieving revision 1.1.2.4
  retrieving revision 1.1.2.5
  diff -u -r1.1.2.4 -r1.1.2.5
  --- ClassLoaderUtils.java	20 Oct 2002 08:49:27 -0000	1.1.2.4
  +++ ClassLoaderUtils.java	31 Oct 2002 07:49:44 -0000	1.1.2.5
  @@ -13,7 +13,10 @@
   import java.io.InputStream;
   import java.io.InputStreamReader;
   import java.io.IOException;
  +import java.lang.reflect.Method;
   import java.net.URL;
  +import java.security.CodeSource;
  +import java.security.ProtectionDomain;
   import java.util.HashMap;
   import java.util.HashSet;
   import java.util.LinkedList;
  @@ -25,13 +28,84 @@
   /** Utility methods for class loader to package names, etc.
    *
    * @author Scott.Stark@jboss.org
  - * @version $Revision: 1.1.2.4 $
  + * @version $Revision: 1.1.2.5 $
    */
   public class ClassLoaderUtils
   {
      private static Logger log = Logger.getLogger(ClassLoaderUtils.class);
   
   
  +   /** Format a string buffer containing the Class, Interfaces, CodeSource,
  +    and ClassLoader information for the given object clazz.
  +
  +    @param clazz the Class
  +    @param results, the buffer to write the info to
  +    */
  +   public static void displayClassInfo(Class clazz, StringBuffer results)
  +   {
  +      // Print out some codebase info for the ProbeHome
  +      ClassLoader cl = clazz.getClassLoader();
  +      results.append("\n"+clazz.getName()+"("+Integer.toHexString(clazz.hashCode())+").ClassLoader="+cl);
  +      ClassLoader parent = cl;
  +      while( parent != null )
  +      {
  +         results.append("\n.."+parent);
  +         URL[] urls = getClassLoaderURLs(parent);
  +         int length = urls != null ? urls.length : 0;
  +         for(int u = 0; u < length; u ++)
  +         {
  +            results.append("\n...."+urls[u]);
  +         }
  +         if( parent != null )
  +            parent = parent.getParent();
  +      }
  +      CodeSource clazzCS = clazz.getProtectionDomain().getCodeSource();
  +      if( clazzCS != null )
  +         results.append("\n++++CodeSource: "+clazzCS);
  +      else
  +         results.append("\n++++Null CodeSource");
  +
  +      results.append("\nImplemented Interfaces:");
  +      Class[] ifaces = clazz.getInterfaces();
  +      for(int i = 0; i < ifaces.length; i ++)
  +      {
  +         Class iface = ifaces[i];
  +         results.append("\n++"+iface+"("+Integer.toHexString(iface.hashCode())+")");
  +         ClassLoader loader = ifaces[i].getClassLoader();
  +         results.append("\n++++ClassLoader: "+loader);
  +         ProtectionDomain pd = ifaces[i].getProtectionDomain();
  +         CodeSource cs = pd.getCodeSource();
  +         if( cs != null )
  +            results.append("\n++++CodeSource: "+cs);
  +         else
  +            results.append("\n++++Null CodeSource");
  +      }
  +   }
  +
  +   /** Use reflection to access a URL[] getURLs or ULR[] getAllURLs method so
  +    that non-URLClassLoader class loaders, or class loaders that override
  +    getURLs to return null or empty, can provide the true classpath info.
  +    */
  +   public static URL[] getClassLoaderURLs(ClassLoader cl)
  +   {
  +      URL[] urls = {};
  +      try
  +      {
  +         Class returnType = urls.getClass();
  +         Class[] parameterTypes = {};
  +         Method getURLs = cl.getClass().getMethod("getURLs", parameterTypes);
  +         if( returnType.isAssignableFrom(getURLs.getReturnType()) )
  +         {
  +            Object[] args = {};
  +            urls = (URL[]) getURLs.invoke(cl, args);
  +         }
  +      }
  +      catch(Exception ignore)
  +      {
  +      }
  +      return urls;
  +   }
  +
      /** Parse a class name into its package prefix. This has to handle
         array classes whose name is prefixed with [L.
       */
  @@ -145,8 +219,13 @@
         {
            pkgSet.add(cl);
            pkgNameSet.add(pkgName);
  +         // Anytime more than one class loader exists this may indicate a problem
  +         if( pkgSet.size() > 1 )
  +         {
  +            log.debug("Multiple class loaders found for pkg: "+pkgName);
  +         }
            if( trace )
  -            log.trace(" Indexed pkg: "+pkgName);
  +            log.trace("Indexed pkg: "+pkgName+", UCL: "+cl);
         }
      }
   
  
  
  


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