Program: 102266
Project: 102266
Buggy source:
/** 
 * Starts up the plugin framework located at the specified install path, and which uses the specified metadata path to store metadata.
 * @param installPath The path identifying the folder where the application is installed.
 * @param metadataPath The path identifying the folder under which the Eclipse metadata folder should be created.
 * @return An instance of ApplicationExtension, or null if no extension with the specified ID is found.
 * @throws ClassNotFoundException If the {@link BootLoader} class could not be found in the boot jar file.
 * @throws CoreException If the boot plugin folder could not be found.
 * @throws IllegalAccessException If one of the reflectively accessed BootLoader methods is not public.
 * @throws InvocationTargetException If one of the reflectively called BootLoader methods throws a {@link RuntimeException}.
 * @throws MalformedURLException If installPath contains an invalid path.
 * @throws NoSuchMethodException If one of the reflectively accessed BootLoader or ApplicationExtension methods does notexist.
 * @since 3.1
 */
public static void startup(String installPath,String metadataPath) throws ClassNotFoundException, CoreException, IllegalAccessException, InvocationTargetException, MalformedURLException, NoSuchMethodException {
  CoreArgCheck.isNotEmpty(installPath,CoreModelerPlugin.Util.getString("String_Node_Str"));
  if (PluginUtilities.bootLoader == null) {
    if (metadataPath == null) {
      metadataPath=TEMPORARY_METADATA_PATH;
    }
    final StringBuffer bootFolderPath=new StringBuffer(installPath);
    final char lastChr=bootFolderPath.charAt(bootFolderPath.length() - 1);
    if (lastChr != '/' && lastChr != '\\') {
      bootFolderPath.append('/');
    }
    bootFolderPath.append(PLUGINS_FOLDER);
    final File[] bootPluginFolders=new File(bootFolderPath.toString()).listFiles(new FileFilter(){
      @Override public boolean accept(      final File file){
        if (file.isDirectory() && file.getName().startsWith(BOOT_PLUGIN_FOLDER)) {
          return true;
        }
        return false;
      }
    }
);
    if (bootPluginFolders.length == 0) {
      final IStatus status=new Status(IStatus.ERROR,BOOT_PLUGIN_FOLDER,BOOT_PLUGIN_FOLDER_NOT_FOUND_CODE,BOOT_PLUGIN_FOLDER_NOT_FOUND_MESSAGE,null);
      throw new CoreException(status);
    }
    final String bootJarPath=new File(bootPluginFolders[0],BOOT_JAR).getAbsolutePath().replace(File.separatorChar,'/');
    final URL bootUrl=new URL(PROTOCOL,null,bootJarPath);
    final Class bootLoader=new URLClassLoader(new URL[]{bootUrl},null).loadClass(BOOT_LOADER);
    final Method startupMeth=bootLoader.getMethod(STARTUP_METHOD,new Class[]{URL.class,String.class,String[].class});
    startupMeth.invoke(bootLoader,new Object[]{null,metadataPath,PluginUtilities.startupArgs});
    PluginUtilities.bootLoader=bootLoader;
  }
}

Fixed version (ground truth):
/** 
 * Starts up the plugin framework located at the specified install path, and which uses the specified metadata path to store metadata.
 * @param installPath The path identifying the folder where the application is installed.
 * @param metadataPath The path identifying the folder under which the Eclipse metadata folder should be created.
 * @return An instance of ApplicationExtension, or null if no extension with the specified ID is found.
 * @throws ClassNotFoundException If the BootLoader class could not be found in the boot jar file.
 * @throws CoreException If the boot plugin folder could not be found.
 * @throws IllegalAccessException If one of the reflectively accessed BootLoader methods is not public.
 * @throws InvocationTargetException If one of the reflectively called BootLoader methods throws a {@link RuntimeException}.
 * @throws MalformedURLException If installPath contains an invalid path.
 * @throws NoSuchMethodException If one of the reflectively accessed BootLoader or ApplicationExtension methods does notexist.
 * @since 3.1
 */
public static void startup(String installPath,String metadataPath) throws ClassNotFoundException, CoreException, IllegalAccessException, InvocationTargetException, MalformedURLException, NoSuchMethodException {
  CoreArgCheck.isNotEmpty(installPath,CoreModelerPlugin.Util.getString("String_Node_Str"));
  if (PluginUtilities.bootLoader == null) {
    if (metadataPath == null) {
      metadataPath=TEMPORARY_METADATA_PATH;
    }
    final StringBuffer bootFolderPath=new StringBuffer(installPath);
    final char lastChr=bootFolderPath.charAt(bootFolderPath.length() - 1);
    if (lastChr != '/' && lastChr != '\\') {
      bootFolderPath.append('/');
    }
    bootFolderPath.append(PLUGINS_FOLDER);
    final File[] bootPluginFolders=new File(bootFolderPath.toString()).listFiles(new FileFilter(){
      @Override public boolean accept(      final File file){
        if (file.isDirectory() && file.getName().startsWith(BOOT_PLUGIN_FOLDER)) {
          return true;
        }
        return false;
      }
    }
);
    if (bootPluginFolders.length == 0) {
      final IStatus status=new Status(IStatus.ERROR,BOOT_PLUGIN_FOLDER,BOOT_PLUGIN_FOLDER_NOT_FOUND_CODE,BOOT_PLUGIN_FOLDER_NOT_FOUND_MESSAGE,null);
      throw new CoreException(status);
    }
    final String bootJarPath=new File(bootPluginFolders[0],BOOT_JAR).getAbsolutePath().replace(File.separatorChar,'/');
    final URL bootUrl=new URL(PROTOCOL,null,bootJarPath);
    final Class bootLoader=new URLClassLoader(new URL[]{bootUrl},null).loadClass(BOOT_LOADER);
    final Method startupMeth=bootLoader.getMethod(STARTUP_METHOD,new Class[]{URL.class,String.class,String[].class});
    startupMeth.invoke(bootLoader,new Object[]{null,metadataPath,PluginUtilities.startupArgs});
    PluginUtilities.bootLoader=bootLoader;
  }
}