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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 14439] New: - Can't locate classloader when creating a new LogFactory
Date Mon, 11 Nov 2002 10:26:33 GMT
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=14439

Can't locate classloader when creating a new LogFactory

           Summary: Can't locate classloader when creating a new LogFactory
           Product: Commons
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Logging
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: bargezi@csi.com


When running WebSphere 5.0 Early Adopters using the Sysdeo Tomcat plugin in 
debug mode I discovered that the LogFactory can't locate a classloader to 
create new Factories. A call to LogFactory.class.getClassLoader() 
returns 'null'. As of the SDK documentation this may be tha case if the 
bootstrap has loaded the class. I thus suggest the following code for the 
newFactory method taken from v1.0.2 of the common logging API:

    /**
     * Return a new instance of the specified <code>LogFactory</code>
     * implementation class, loaded by the specified class loader.
     * If that fails, try the class loader used to load this
     * (abstract) LogFactory.
     *
     * @param factoryClass Fully qualified name of the <code>LogFactory</code>
     *  implementation class
     * @param classLoader ClassLoader from which to load this class
     *
     * @exception LogConfigurationException if a suitable instance
     *  cannot be created
     */
    protected static LogFactory newFactory(String factoryClass,
                                           ClassLoader classLoader)
        throws LogConfigurationException
    {
        
        try {
            if (classLoader == null)
                classLoader = LogFactory.class.getClassLoader();
            Class clazz = null;
            try {
	            // #FIX: RBA
	            // may be null in case the classloader is the bootstrap 
loader
            	if(classLoader == null) {
            		// try general load
            		clazz = Class.forName(factoryClass);
            	} else {
	                // first the thread class loader
	                clazz = classLoader.loadClass(factoryClass);
            	}
            } catch (ClassNotFoundException ex) {
                // if this failed (i.e. no implementation is
                // found in the webapp), try the caller's loader
                // if we haven't already...
                if (classLoader != LogFactory.class.getClassLoader()) {
                    classLoader = LogFactory.class.getClassLoader();

                    if(classLoader == null) {
	            		// try general load
	            		clazz = Class.forName(factoryClass);
                    } else {
	                    clazz = classLoader.loadClass(factoryClass);
                    }
                }
            }
            
            LogFactory factory = (LogFactory)clazz.newInstance();
            
            return factory;
        } catch (Exception e) {
            throw new LogConfigurationException(e);
        }

    }

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