java.net.URLClassLoader.getParent()方法的使用及代码示例

x33g5p2x  于2022-01-31 转载在 其他  
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本文整理了Java中java.net.URLClassLoader.getParent()方法的一些代码示例，展示了URLClassLoader.getParent()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。URLClassLoader.getParent()方法的具体详情如下：
包路径：java.net.URLClassLoader
类名称：URLClassLoader
方法名：getParent

URLClassLoader.getParent介绍

暂无

代码示例

代码示例来源：origin: org.glassfish.main.web/war-util

  1. @Override
  2.   public URLClassLoader run() {
  3.     return new URLClassLoader(urlArray, webAppCl.getParent());
  4.   }
  5. });

代码示例来源：origin: zhong-j-yu/bayou

  1. ClassLoaderFactory(URLClassLoader launcherClassLoader)
  2. {
  3.   this.parentCL = launcherClassLoader.getParent(); // could be null.
  4.   this.allUrls.addAll(Arrays.asList(launcherClassLoader.getURLs()));
  5. }

代码示例来源：origin: GeeQuery/ef-orm

  1. /**
  2.  * 得到虚拟机扩展的ClassLoader
  3.  */
  4. public static URLClassLoader getJvmExtClassLoader() {
  5.   return (URLClassLoader) getAppClassLoader().getParent();
  6. }

代码示例来源：origin: org.ow2.frascati/frascati-assembly-factory

  1. /**
  2.  * Debug output for given ClassLoader - print loaded URLs
  3.  *
  4.  * @param classLoader ClassLoader used
  5.  */
  6. protected final void debug(ClassLoader classLoader, PrintStream printStream)
  7. {
  8.  ClassLoader cl = (classLoader != null) ? classLoader : this.mainClassLoader;
  9.  PrintStream out = (printStream != null) ? printStream : System.err;
  10.  out.println("----- Debugging ClassLoader ----------");
  11.  out.println("List of URL loaded for ClassLoader : " + cl);
  12.  out.println("--------------------------------------");
  13.  while (cl instanceof URLClassLoader) {
  14.   URLClassLoader urlcl = (URLClassLoader) cl;
  15.   for (URL url : urlcl.getURLs()) {
  16.    out.println("> " + url);
  17.   }
  18.   cl = urlcl.getParent();
  19.  }
  20.  out.println("--------------------------------------");
  21. }

代码示例来源：origin: apache/twill

  1. /**
  2.  * Creates a {@link ClassLoader} to be used by this container that load classes from the given classpath.
  3.  */
  4. private static ClassLoader createContainerClassLoader(URL[] classpath) {
  5.  String containerClassLoaderName = System.getProperty(Constants.TWILL_CONTAINER_CLASSLOADER);
  6.  URLClassLoader classLoader = new URLClassLoader(classpath);
  7.  if (containerClassLoaderName == null) {
  8.   return classLoader;
  9.  }
  10.  try {
  11.   @SuppressWarnings("unchecked")
  12.   Class<? extends ClassLoader> cls = (Class<? extends ClassLoader>) classLoader.loadClass(containerClassLoaderName);
  13.   // Instantiate with constructor (URL[] classpath, ClassLoader parentClassLoader)
  14.   return cls.getConstructor(URL[].class, ClassLoader.class).newInstance(classpath, classLoader.getParent());
  15.  } catch (ClassNotFoundException e) {
  16.   throw new RuntimeException("Failed to load container class loader class " + containerClassLoaderName, e);
  17.  } catch (NoSuchMethodException e) {
  18.   throw new RuntimeException("Container class loader must have a public constructor with " +
  19.                  "parameters (URL[] classpath, ClassLoader parent)", e);
  20.  } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
  21.   throw new RuntimeException("Failed to create container class loader of class " + containerClassLoaderName, e);
  22.  }
  23. }

代码示例来源：origin: cdapio/cdap

  1. /**
  2.  * Creates a {@link ClassLoader} to be used by this container that load classes from the given classpath.
  3.  */
  4. private static ClassLoader createContainerClassLoader(URL[] classpath) {
  5.  String containerClassLoaderName = System.getProperty(Constants.TWILL_CONTAINER_CLASSLOADER);
  6.  URLClassLoader classLoader = new URLClassLoader(classpath);
  7.  if (containerClassLoaderName == null) {
  8.   return classLoader;
  9.  }
  10.  try {
  11.   @SuppressWarnings("unchecked")
  12.   Class<? extends ClassLoader> cls = (Class<? extends ClassLoader>) classLoader.loadClass(containerClassLoaderName);
  13.   // Instantiate with constructor (URL[] classpath, ClassLoader parentClassLoader)
  14.   return cls.getConstructor(URL[].class, ClassLoader.class).newInstance(classpath, classLoader.getParent());
  15.  } catch (ClassNotFoundException e) {
  16.   throw new RuntimeException("Failed to load container class loader class " + containerClassLoaderName, e);
  17.  } catch (NoSuchMethodException e) {
  18.   throw new RuntimeException("Container class loader must have a public constructor with " +
  19.                  "parameters (URL[] classpath, ClassLoader parent)", e);
  20.  } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
  21.   throw new RuntimeException("Failed to create container class loader of class " + containerClassLoaderName, e);
  22.  }
  23. }

代码示例来源：origin: org.apache.twill/twill-core

  1. /**
  2.  * Creates a {@link ClassLoader} to be used by this container that load classes from the given classpath.
  3.  */
  4. private static ClassLoader createContainerClassLoader(URL[] classpath) {
  5.  String containerClassLoaderName = System.getProperty(Constants.TWILL_CONTAINER_CLASSLOADER);
  6.  URLClassLoader classLoader = new URLClassLoader(classpath);
  7.  if (containerClassLoaderName == null) {
  8.   return classLoader;
  9.  }
  10.  try {
  11.   @SuppressWarnings("unchecked")
  12.   Class<? extends ClassLoader> cls = (Class<? extends ClassLoader>) classLoader.loadClass(containerClassLoaderName);
  13.   // Instantiate with constructor (URL[] classpath, ClassLoader parentClassLoader)
  14.   return cls.getConstructor(URL[].class, ClassLoader.class).newInstance(classpath, classLoader.getParent());
  15.  } catch (ClassNotFoundException e) {
  16.   throw new RuntimeException("Failed to load container class loader class " + containerClassLoaderName, e);
  17.  } catch (NoSuchMethodException e) {
  18.   throw new RuntimeException("Container class loader must have a public constructor with " +
  19.                  "parameters (URL[] classpath, ClassLoader parent)", e);
  20.  } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
  21.   throw new RuntimeException("Failed to create container class loader of class " + containerClassLoaderName, e);
  22.  }
  23. }

代码示例来源：origin: co.cask.cdap/cdap-app-fabric

  1. /**
  2.  * Creates a {@link ClassLoader} to be used by this container that load classes from the given classpath.
  3.  */
  4. private static ClassLoader createContainerClassLoader(URL[] classpath) {
  5.  String containerClassLoaderName = System.getProperty(Constants.TWILL_CONTAINER_CLASSLOADER);
  6.  URLClassLoader classLoader = new URLClassLoader(classpath);
  7.  if (containerClassLoaderName == null) {
  8.   return classLoader;
  9.  }
  10.  try {
  11.   @SuppressWarnings("unchecked")
  12.   Class<? extends ClassLoader> cls = (Class<? extends ClassLoader>) classLoader.loadClass(containerClassLoaderName);
  13.   // Instantiate with constructor (URL[] classpath, ClassLoader parentClassLoader)
  14.   return cls.getConstructor(URL[].class, ClassLoader.class).newInstance(classpath, classLoader.getParent());
  15.  } catch (ClassNotFoundException e) {
  16.   throw new RuntimeException("Failed to load container class loader class " + containerClassLoaderName, e);
  17.  } catch (NoSuchMethodException e) {
  18.   throw new RuntimeException("Container class loader must have a public constructor with " +
  19.                  "parameters (URL[] classpath, ClassLoader parent)", e);
  20.  } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
  21.   throw new RuntimeException("Failed to create container class loader of class " + containerClassLoaderName, e);
  22.  }
  23. }

代码示例来源：origin: gridkit/nanocloud

  1. public static Collection<URL> listCurrentClasspath(URLClassLoader classLoader) {
  2.   Set<URL> result = new LinkedHashSet<URL>();
  3.   while(true) {
  4.     for(URL url: classLoader.getURLs()) {
  5.       addEntriesFromManifest(result, url);
  6.     }        
  7.     ClassLoader cls = classLoader.getParent();
  8.     if (cls instanceof URLClassLoader) {
  9.       if (cls.getClass().getName().endsWith("$ExtClassLoader")) {
  10.         break;
  11.       }
  12.       classLoader = (URLClassLoader) cls;
  13.     }
  14.     else {
  15.       break;
  16.     }
  17.   }
  18.   return new ArrayList<URL>(result);
  19. }

代码示例来源：origin: org.dspace.dependencies.solr/dspace-solr-core

  1. private static URLClassLoader replaceClassLoader(final URLClassLoader oldLoader,
  2.                          final File base,
  3.                          final FileFilter filter) {
  4.  if (null != base && base.canRead() && base.isDirectory()) {
  5.   File[] files = base.listFiles(filter);
  6.   
  7.   if (null == files || 0 == files.length) return oldLoader;
  8.   
  9.   URL[] oldElements = oldLoader.getURLs();
  10.   URL[] elements = new URL[oldElements.length + files.length];
  11.   System.arraycopy(oldElements, 0, elements, 0, oldElements.length);
  12.   
  13.   for (int j = 0; j < files.length; j++) {
  14.    try {
  15.     URL element = files[j].toURI().normalize().toURL();
  16.     log.info("Adding '" + element.toString() + "' to classloader");
  17.     elements[oldElements.length + j] = element;
  18.    } catch (MalformedURLException e) {
  19.     SolrException.log(log, "Can't add element to classloader: " + files[j], e);
  20.    }
  21.   }
  22.   return URLClassLoader.newInstance(elements, oldLoader.getParent());
  23.  }
  24.  // are we still here?
  25.  return oldLoader;
  26. }

代码示例来源：origin: org.apache.geronimo.modules/geronimo-jaxws-builder

  1. public static void getClassLoaderClasspath(ClassLoader loader, LinkedHashSet<URL> classpath) {
  2.     if (loader == null || loader == ClassLoader.getSystemClassLoader()) {
  3.       return;
  4. //        } else if (loader instanceof MultiParentClassLoader) {
  5. //            MultiParentClassLoader cl = (MultiParentClassLoader)loader;
  6. //            for (ClassLoader parent : cl.getParents()) {
  7. //                getClassLoaderClasspath(parent, classpath);
  8. //            }
  9. //            for (URL u : cl.getURLs()) {
  10. //                classpath.add(u);
  11. //            }
  12.     } else if (loader instanceof URLClassLoader) {
  13.       URLClassLoader cl = (URLClassLoader)loader;
  14.       getClassLoaderClasspath(cl.getParent(), classpath);
  15.       for (URL u : cl.getURLs()) {
  16.         classpath.add(u);
  17.       }
  18.     } else {
  19.       getClassLoaderClasspath(loader.getParent(), classpath);
  20.     }
  21.   }

代码示例来源：origin: com.googlecode.fighting-layout-bugs/fighting-layout-bugs

  1. /**
  2.  * Constructs the class path of the {@link Thread#getContextClassLoader() current class loader}.
  3.  */
  4. public ClassPath() {
  5.   List<File> files = new ArrayList<File>();
  6.   URLClassLoader classLoader = (URLClassLoader) Thread.currentThread().getContextClassLoader();
  7.   do {
  8.     URL[] urls = classLoader.getURLs();
  9.     if (urls.length == 1 && "sun.misc.Launcher$AppClassLoader".equals(classLoader.getClass().getName())) {
  10.       File jarFile = toFile(urls[0]);
  11.       files.add(jarFile);
  12.       files.addAll(readClassPathFromManifestOf(jarFile));
  13.     } else {
  14.       for (URL url : urls) {
  15.         File file = toFile(url);
  16.         files.add(file);
  17.         if (SUREFIREBOOTER_JAR_FILE_NAME_PATTERN.matcher(file.getName()).matches()) {
  18.           files.addAll(readClassPathFromManifestOf(file));
  19.         }
  20.       }
  21.     }
  22.     ClassLoader parentClassLoader = classLoader.getParent();
  23.     // noinspection ObjectEquality
  24.     classLoader = (parentClassLoader instanceof URLClassLoader && parentClassLoader != classLoader ? (URLClassLoader) parentClassLoader : null);
  25.   } while (classLoader != null);
  26.   _files = Collections.unmodifiableList(files);
  27. }

代码示例来源：origin: org.robolectric/robolectric-sandbox

  1. public SandboxClassLoader(URLClassLoader systemClassLoader, InstrumentationConfiguration config, URL... urls) {
  2.  super(systemClassLoader.getURLs(), systemClassLoader.getParent());
  3.  this.systemClassLoader = systemClassLoader;
  4.  this.config = config;
  5.  this.urls = new URLClassLoader(urls, null);
  6.  classesToRemap = convertToSlashes(config.classNameTranslations());
  7.  methodsToIntercept = convertToSlashes(config.methodsToIntercept());
  8.  for (URL url : urls) {
  9.   Logger.debug("Loading classes from: %s", url);
  10.  }
  11. }

代码示例来源：origin: 8tory/SimpleWeibo

  1. /**
  2.  * Make a different ClassLoader that loads the same URLs as this one, and use it to compile
  3.  * an {@code @RetroWeibo} class. If Velocity loads its managers using the context class loader,
  4.  * and that loader is still the original one that loaded this test, then it will find the
  5.  * original copy of the Velocity classes rather than the one from the new loader, and fail.
  6.  *
  7.  * <p>This test assumes that the test class was loaded by a URLClassLoader and that that loader's
  8.  * URLs also include the Velocity classes.
  9.  */
  10. public void testClassLoaderHack() throws Exception {
  11.  URLClassLoader myLoader = (URLClassLoader) getClass().getClassLoader();
  12.  URLClassLoader newLoader = new URLClassLoader(myLoader.getURLs(), myLoader.getParent());
  13.  String velocityClassName = Velocity.class.getName();
  14.  Class<?> myVelocity = myLoader.loadClass(velocityClassName);
  15.  Class<?> newVelocity = newLoader.loadClass(velocityClassName);
  16.  assertThat(myVelocity).isNotEqualTo(newVelocity);
  17.  Runnable test = (Runnable) newLoader.loadClass(RunInClassLoader.class.getName()).newInstance();
  18.  assertThat(test.getClass()).isNotEqualTo(RunInClassLoader.class);
  19.  test.run();
  20. }

代码示例来源：origin: javapathfinder/jpf-core

  1. @Test 
  2. public void testConstructorEmptyURLs () {
  3.  if (verifyNoPropertyViolation()) {
  4.   URLClassLoader cl = new URLClassLoader(new URL[0]);
  5.   assertNotNull(cl.getParent());
  6.   assertEquals(cl.getParent(), ClassLoader.getSystemClassLoader());
  7.  }
  8. }

代码示例来源：origin: yongjhih/AutoJson

  1. /**
  2.  * Make a different ClassLoader that loads the same URLs as this one, and use it to compile
  3.  * an {@code @AutoJson} class. If Velocity loads its managers using the context class loader,
  4.  * and that loader is still the original one that loaded this test, then it will find the
  5.  * original copy of the Velocity classes rather than the one from the new loader, and fail.
  6.  *
  7.  * <p>This test assumes that the test class was loaded by a URLClassLoader and that that loader's
  8.  * URLs also include the Velocity classes.
  9.  */
  10. public void testClassLoaderHack() throws Exception {
  11.  URLClassLoader myLoader = (URLClassLoader) getClass().getClassLoader();
  12.  URLClassLoader newLoader = new URLClassLoader(myLoader.getURLs(), myLoader.getParent());
  13.  String velocityClassName = Velocity.class.getName();
  14.  Class<?> myVelocity = myLoader.loadClass(velocityClassName);
  15.  Class<?> newVelocity = newLoader.loadClass(velocityClassName);
  16.  assertThat(myVelocity).isNotEqualTo(newVelocity);
  17.  Runnable test = (Runnable) newLoader.loadClass(RunInClassLoader.class.getName()).newInstance();
  18.  assertThat(test.getClass()).isNotEqualTo(RunInClassLoader.class);
  19.  test.run();
  20. }

代码示例来源：origin: yongjhih/RetroFacebook

  1. /**
  2.  * Make a different ClassLoader that loads the same URLs as this one, and use it to compile
  3.  * an {@code @RetroFacebook} class. If Velocity loads its managers using the context class loader,
  4.  * and that loader is still the original one that loaded this test, then it will find the
  5.  * original copy of the Velocity classes rather than the one from the new loader, and fail.
  6.  *
  7.  * <p>This test assumes that the test class was loaded by a URLClassLoader and that that loader's
  8.  * URLs also include the Velocity classes.
  9.  */
  10. public void testClassLoaderHack() throws Exception {
  11.  URLClassLoader myLoader = (URLClassLoader) getClass().getClassLoader();
  12.  URLClassLoader newLoader = new URLClassLoader(myLoader.getURLs(), myLoader.getParent());
  13.  String velocityClassName = Velocity.class.getName();
  14.  Class<?> myVelocity = myLoader.loadClass(velocityClassName);
  15.  Class<?> newVelocity = newLoader.loadClass(velocityClassName);
  16.  assertThat(myVelocity).isNotEqualTo(newVelocity);
  17.  Runnable test = (Runnable) newLoader.loadClass(RunInClassLoader.class.getName()).newInstance();
  18.  assertThat(test.getClass()).isNotEqualTo(RunInClassLoader.class);
  19.  test.run();
  20. }

代码示例来源：origin: yongjhih/RetroFacebook

  1. /**
  2.  * Make a different ClassLoader that loads the same URLs as this one, and use it to compile
  3.  * an {@code @RetroFacebook} class. If Velocity loads its managers using the context class loader,
  4.  * and that loader is still the original one that loaded this test, then it will find the
  5.  * original copy of the Velocity classes rather than the one from the new loader, and fail.
  6.  *
  7.  * <p>This test assumes that the test class was loaded by a URLClassLoader and that that loader's
  8.  * URLs also include the Velocity classes.
  9.  */
  10. public void testClassLoaderHack() throws Exception {
  11.  URLClassLoader myLoader = (URLClassLoader) getClass().getClassLoader();
  12.  URLClassLoader newLoader = new URLClassLoader(myLoader.getURLs(), myLoader.getParent());
  13.  String velocityClassName = Velocity.class.getName();
  14.  Class<?> myVelocity = myLoader.loadClass(velocityClassName);
  15.  Class<?> newVelocity = newLoader.loadClass(velocityClassName);
  16.  assertThat(myVelocity).isNotEqualTo(newVelocity);
  17.  Runnable test = (Runnable) newLoader.loadClass(RunInClassLoader.class.getName()).newInstance();
  18.  assertThat(test.getClass()).isNotEqualTo(RunInClassLoader.class);
  19.  test.run();
  20. }

代码示例来源：origin: javapathfinder/jpf-core

  1. @Test
  2. public void testConstructorParent() {
  3.  if (verifyNoPropertyViolation()) {
  4.   URL[] urls = new URL[0];
  5.   ClassLoader parent = new TestClassLoader(urls);
  6.   URLClassLoader cl =  new URLClassLoader(urls, parent);
  7.   assertNotNull(parent.getParent());
  8.   assertEquals(parent.getParent(), ClassLoader.getSystemClassLoader());
  9.   assertNotNull(cl.getParent());
  10.   assertEquals(cl.getParent(), parent);
  11.  }
  12. }

代码示例来源：origin: javapathfinder/jpf-core

  1. @Test
  2. public void testNewInstance2() throws MalformedURLException, ClassNotFoundException {
  3.  movePkgOut();
  4.  if (verifyNoPropertyViolation()) {
  5.   URL[] urls = new URL[1];
  6.   urls[0] = new URL(dirUrl);
  7.   URLClassLoader parent =  URLClassLoader.newInstance(urls);
  8.   URLClassLoader cl =  URLClassLoader.newInstance(urls, parent);
  9.   assertSame(parent, cl.getParent());
  10.   Class<?> c = cl.loadClass(pkg + ".Class1");
  11.   assertNotNull(c);
  12.   assertSame(c.getClassLoader(), parent);
  13.   String resName = pkg + "/Interface1.class";
  14.   URL resource = cl.getResource(resName);
  15.   assertNotNull(resource);
  16.   resource = cl.getParent().getResource(resName);
  17.   assertNotNull(resource);
  18.  }
  19.  movePkgBack();
  20. }

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