Class 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 Detail

      • ClassLoaderUtil

        public ClassLoaderUtil()
    • Method Detail

      • 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
      • 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
      • 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
        Throws:
        ClassNotFoundException - If the class cannot be found anywhere.