Package com.opensymphony.module.sitemesh.util

Class ClassLoaderUtil

java.lang.Object
com.opensymphony.module.sitemesh.util.ClassLoaderUtil
public class ClassLoaderUtil extends 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 Details

    • ClassLoaderUtil

      public ClassLoaderUtil()

  • Method Details

    • getResource

      public static URL getResource(String resourceName, 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
      Returns:
      the resource

    • getResourceAsStream

      public static InputStream getResourceAsStream(String resourceName, 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
      Returns:
      the resource as stream

    • loadClass

      public static Class<?> loadClass(String className, Class<?> callingClass) throws 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
      Returns:
      the class
      Throws:
      ClassNotFoundException - If the class cannot be found anywhere.