com.opensymphony.module.sitemesh.util

Class ClassLoaderUtil

java.lang.Object

com.opensymphony.module.sitemesh.util.ClassLoaderUtil

public class ClassLoaderUtil
extends java.lang.Object

This class is extremely useful for loading resources and classes in a fault tolerant manner that works across different applications servers. It has come out of many months of frustrating use of multiple application servers at Atlassian, please don't change things unless you're sure they're not going to break in one server or another!

Constructor Summary

Constructors

Constructor and Description
ClassLoaderUtil()

Method Summary

Modifier and Type	Method and Description
static java.net.URL	getResource(java.lang.String resourceName, java.lang.Class callingClass) Load a given resource.
static java.io.InputStream	getResourceAsStream(java.lang.String resourceName, java.lang.Class callingClass) This is a convenience method to load a resource as a stream.
static java.lang.Class	loadClass(java.lang.String className, java.lang.Class callingClass) Load a class with a given name.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ClassLoaderUtil

public ClassLoaderUtil()

Method Detail

getResource

public static java.net.URL getResource(java.lang.String resourceName,
                                       java.lang.Class callingClass)

Load a given resource. This method will try to load the resource using the following methods (in order):

• From Thread.currentThread().getContextClassLoader()
• From ClassLoaderUtil.class.getClassLoader()
• callingClass.getClassLoader()

Parameters:

resourceName - The name of the resource to load

callingClass - The Class object of the calling object

getResourceAsStream

public static java.io.InputStream getResourceAsStream(java.lang.String resourceName,
                                                      java.lang.Class callingClass)

This is a convenience method to load a resource as a stream. The algorithm used to find the resource is given in getResource()

Parameters:

resourceName - The name of the resource to load

callingClass - The Class object of the calling object

loadClass

public static java.lang.Class loadClass(java.lang.String className,
                                        java.lang.Class callingClass)
                                 throws java.lang.ClassNotFoundException

Load a class with a given name. It will try to load the class in the following order:

• From Thread.currentThread().getContextClassLoader()
• Using the basic Class.forName()
• From ClassLoaderUtil.class.getClassLoader()
• From the callingClass.getClassLoader()

Parameters:

className - The name of the class to load

callingClass - The Class object of the calling object

Throws:

java.lang.ClassNotFoundException - If the class cannot be found anywhere.