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From: Craig L Russell <craig.russell@oracle.com>
To: "jdo-dev@db.apache.org project" <jdo-dev@db.apache.org>
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Subject: log4j class loader
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Date: Fri, 2 Mar 2012 10:25:52 -0800

It looks like log4j looks in the class loader that loads the log4j  
classes [1], so putting the configuration file directory in the class  
loader used to load log4j should work.

I looked in Enhance.java and couldn't quite figure out where the log4j  
jar file is being added to the class path.

             URL[] classPathURLs = new URL[2];
             ArrayList<URL> cpList = new ArrayList<URL>();
             ClassLoader loader = null;
             try {
                 cpList.add((new  
File(enhancedIdDirName)).toURI().toURL());
                 cpList.add((new File(fromDirName)).toURI().toURL());
                 String[] jars = {"jar"};
                 if (impl.equals("iut")) {
                     fi = FileUtils.iterateFiles(new  
File(iutLibsDirectory), jars, true);
                     while (fi.hasNext()) {
                         cpList.add(fi.next().toURI().toURL());
                     }
                 }
                 loader = new  
URLClassLoader(cpList.toArray(classPathURLs),
                         getClass().getClassLoader());
                 // Utilities.printClasspath(loader);
             } catch (MalformedURLException ex) {
                  
Logger.getLogger(Enhance.class.getName()).log(Level.SEVERE, null, ex);
             }

Actually, I can't figure out where DataNucleus and log4j are being  
added to the class path of the loader.

Craig

[1] sources from log4j
   /**
69
This method will search for <code>resource</code> in different
70
places. The search order is as follows:
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72
<ol>
73
74
<p><li>Search for <code>resource</code> using the thread context
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class loader under Java2. If that fails, search for
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<code>resource</code> using the class loader that loaded this
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class (<code>Loader</code>). Under JDK 1.1, only the the class
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loader that loaded this class (<code>Loader</code>) is used.
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<p><li>Try one last time with
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<code>ClassLoader.getSystemResource(resource)</code>, that is is
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using the system class loader in JDK 1.2 and virtual machine's
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built-in class loader in JDK 1.1.
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</ol>
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*/
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static public URL getResource(String resource) {
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ClassLoader classLoader = null;
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URL url = null;
90
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try {
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if(!java1 && !ignoreTCL) {
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classLoader = getTCL();
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if(classLoader != null) {
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LogLog.debug("Trying to find ["+resource+"] using context classloader "
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+classLoader+".");
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url = classLoader.getResource(resource);
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if(url != null) {
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return url;
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}
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}
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}
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// We could not find resource. Ler us now try with the
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// classloader that loaded this class.
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classLoader = Loader.class.getClassLoader();
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if(classLoader != null) {
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LogLog.debug("Trying to find ["+resource+"] using "+classLoader
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+" class loader.");
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url = classLoader.getResource(resource);
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if(url != null) {
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return url;
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}
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}
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} catch(IllegalAccessException t) {
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LogLog.warn(TSTR, t);
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} catch(InvocationTargetException t) {
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if (t.getTargetException() instanceof InterruptedException
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|| t.getTargetException() instanceof InterruptedIOException) {
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Thread.currentThread().interrupt();
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}
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LogLog.warn(TSTR, t);
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} catch(Throwable t) {
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//
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// can't be InterruptedException or InterruptedIOException
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// since not declared, must be error or RuntimeError.
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LogLog.warn(TSTR, t);
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}
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// Last ditch attempt: get the resource from the class path. It
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// may be the case that clazz was loaded by the Extentsion class
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// loader which the parent of the system class loader. Hence the
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// code below.
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LogLog.debug("Trying to find ["+resource+
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"] using ClassLoader.getSystemResource().");
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return ClassLoader.getSystemResource(resource);
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}
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13
Craig L Russell
Architect, Oracle
http://db.apache.org/jdo
408 276-5638 mailto:Craig.Russell@oracle.com
P.S. A good JDO? O, Gasp!