Package com.sun.jini.start

Class ClassLoaderUtil

java.lang.Object
com.sun.jini.start.ClassLoaderUtil
public class ClassLoaderUtil extends Object
This class provides useful utilities for creating and manipulating class loaders.
Author:
Sun Microsystems, Inc.

  • Method Details

    • getClasspathURLs

      public static URL[] getClasspathURLs(String classpath) throws IOException, MalformedURLException
      Utility method that converts the components of a String representing a classpath into file URL(s).
      Parameters:
      classpath - String containing components separated by path separators that represent the components making up a classpath
      Returns:
      a URL[] where each element of the array corresponds to one of the components in the classpath parameter. The path components are (potentially) expanded via File.getCanonicalFile() before converting to a URL format.
      Throws:
      MalformedURLException - If the path cannot be parsed as a URL
      java.net.IOException - If an I/O error occurs, which is possible because the construction of the canonical pathname may require filesystem queries
      IOException

    • getCodebaseURLs

      public static URL[] getCodebaseURLs(String codebase) throws MalformedURLException
      Utility method that converts the components of a String representing a codebase into standard URL(s).
      Parameters:
      codebase - String containing components separated by spaces in which each component is in URL format.
      Returns:
      a URL[] where each element of the array corresponds to one of the components in the codebase parameter
      Throws:
      MalformedURLException

    • getImportCodebaseURLs

      public static URL[] getImportCodebaseURLs(String importCodebase) throws IOException, MalformedURLException
      Utility method that converts the components of a String representing a codebase or classpath into URL(s).
      Parameters:
      importCodebase - String assumed (in order) to be either 1) a space delimited set of URL(s) representing a codebase or 2) a File.pathSeparator delimited set of class paths.
      Returns:
      a URL[] where each element of the array corresponds to one of the components in the importCodebase parameter
      Throws:
      MalformedURLException - If the path cannot be parsed as a URL
      java.net.IOException - If an I/O error occurs, which is possible because the construction of the canonical pathname may require filesystem queries
      IOException

    • displayContextClassLoaderTree

      public static void displayContextClassLoaderTree()
      Utility method that displays the class loader delegation tree for the current context class loader. For each class loader in the tree, this method displays the locations from which that class loader will retrieve and load requested classes.

      This method can be useful when debugging problems related to the receipt of exceptions such as ClassNotFoundException.

    • displayClassLoaderTree

      public static void displayClassLoaderTree(ClassLoader classloader)
      Utility method that displays the class loader delegation tree for the given class loader. For each class loader in the tree, this method displays the locations from which that class loader will retrieve and load requested classes.

      This method can be useful when debugging problems related to the receipt of exceptions such as ClassNotFoundException.

      Parameters:
      classloader - ClassLoader instance whose delegation tree is to be displayed