1 /* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.net; 27 28 import java.io.Closeable; 29 import java.io.File; 30 import java.io.FilePermission; 31 import java.io.IOException; 32 import java.io.InputStream; 33 import java.security.AccessControlContext; 34 import java.security.AccessController; 35 import java.security.CodeSigner; 36 import java.security.CodeSource; 37 import java.security.Permission; 38 import java.security.PermissionCollection; 39 import java.security.PrivilegedAction; 40 import java.security.PrivilegedExceptionAction; 41 import java.security.SecureClassLoader; 42 import java.util.Enumeration; 43 import java.util.List; 44 import java.util.NoSuchElementException; 45 import java.util.Objects; 46 import java.util.Set; 47 import java.util.WeakHashMap; 48 import java.util.jar.Attributes; 49 import java.util.jar.Attributes.Name; 50 import java.util.jar.JarFile; 51 import java.util.jar.Manifest; 52 import sun.misc.Resource; 53 import sun.misc.URLClassPath; 54 import sun.net.www.ParseUtil; 55 import sun.security.util.SecurityConstants; 56 57 /** 58 * This class loader is used to load classes and resources from a search 59 * path of URLs referring to both JAR files and directories. Any URL that 60 * ends with a '/' is assumed to refer to a directory. Otherwise, the URL 61 * is assumed to refer to a JAR file which will be opened as needed. 62 * <p> 63 * The AccessControlContext of the thread that created the instance of 64 * URLClassLoader will be used when subsequently loading classes and 65 * resources. 66 * <p> 67 * The classes that are loaded are by default granted permission only to 68 * access the URLs specified when the URLClassLoader was created. 69 * 70 * @author David Connelly 71 * @since 1.2 72 */ 73 public class URLClassLoader extends SecureClassLoader implements Closeable { 74 /* The search path for classes and resources */ 75 private final URLClassPath ucp; 76 77 /* The context to be used when loading classes and resources */ 78 private final AccessControlContext acc; 79 80 /** 81 * Constructs a new URLClassLoader for the given URLs. The URLs will be 82 * searched in the order specified for classes and resources after first 83 * searching in the specified parent class loader. Any URL that ends with 84 * a '/' is assumed to refer to a directory. Otherwise, the URL is assumed 85 * to refer to a JAR file which will be downloaded and opened as needed. 86 * 87 * <p>If there is a security manager, this method first 88 * calls the security manager's {@code checkCreateClassLoader} method 89 * to ensure creation of a class loader is allowed. 90 * 91 * @param urls the URLs from which to load classes and resources 92 * @param parent the parent class loader for delegation 93 * @exception SecurityException if a security manager exists and its 94 * {@code checkCreateClassLoader} method doesn't allow 95 * creation of a class loader. 96 * @exception NullPointerException if {@code urls} is {@code null}. 97 * @see SecurityManager#checkCreateClassLoader 98 */ URLClassLoader(URL[] urls, ClassLoader parent)99 public URLClassLoader(URL[] urls, ClassLoader parent) { 100 super(parent); 101 // this is to make the stack depth consistent with 1.1 102 SecurityManager security = System.getSecurityManager(); 103 if (security != null) { 104 security.checkCreateClassLoader(); 105 } 106 ucp = new URLClassPath(urls); 107 this.acc = AccessController.getContext(); 108 } 109 URLClassLoader(URL[] urls, ClassLoader parent, AccessControlContext acc)110 URLClassLoader(URL[] urls, ClassLoader parent, 111 AccessControlContext acc) { 112 super(parent); 113 // this is to make the stack depth consistent with 1.1 114 SecurityManager security = System.getSecurityManager(); 115 if (security != null) { 116 security.checkCreateClassLoader(); 117 } 118 ucp = new URLClassPath(urls); 119 this.acc = acc; 120 } 121 122 /** 123 * Constructs a new URLClassLoader for the specified URLs using the 124 * default delegation parent {@code ClassLoader}. The URLs will 125 * be searched in the order specified for classes and resources after 126 * first searching in the parent class loader. Any URL that ends with 127 * a '/' is assumed to refer to a directory. Otherwise, the URL is 128 * assumed to refer to a JAR file which will be downloaded and opened 129 * as needed. 130 * 131 * <p>If there is a security manager, this method first 132 * calls the security manager's {@code checkCreateClassLoader} method 133 * to ensure creation of a class loader is allowed. 134 * 135 * @param urls the URLs from which to load classes and resources 136 * 137 * @exception SecurityException if a security manager exists and its 138 * {@code checkCreateClassLoader} method doesn't allow 139 * creation of a class loader. 140 * @exception NullPointerException if {@code urls} is {@code null}. 141 * @see SecurityManager#checkCreateClassLoader 142 */ URLClassLoader(URL[] urls)143 public URLClassLoader(URL[] urls) { 144 super(); 145 // this is to make the stack depth consistent with 1.1 146 SecurityManager security = System.getSecurityManager(); 147 if (security != null) { 148 security.checkCreateClassLoader(); 149 } 150 ucp = new URLClassPath(urls); 151 this.acc = AccessController.getContext(); 152 } 153 URLClassLoader(URL[] urls, AccessControlContext acc)154 URLClassLoader(URL[] urls, AccessControlContext acc) { 155 super(); 156 // this is to make the stack depth consistent with 1.1 157 SecurityManager security = System.getSecurityManager(); 158 if (security != null) { 159 security.checkCreateClassLoader(); 160 } 161 ucp = new URLClassPath(urls); 162 this.acc = acc; 163 } 164 165 /** 166 * Constructs a new URLClassLoader for the specified URLs, parent 167 * class loader, and URLStreamHandlerFactory. The parent argument 168 * will be used as the parent class loader for delegation. The 169 * factory argument will be used as the stream handler factory to 170 * obtain protocol handlers when creating new jar URLs. 171 * 172 * <p>If there is a security manager, this method first 173 * calls the security manager's {@code checkCreateClassLoader} method 174 * to ensure creation of a class loader is allowed. 175 * 176 * @param urls the URLs from which to load classes and resources 177 * @param parent the parent class loader for delegation 178 * @param factory the URLStreamHandlerFactory to use when creating URLs 179 * 180 * @exception SecurityException if a security manager exists and its 181 * {@code checkCreateClassLoader} method doesn't allow 182 * creation of a class loader. 183 * @see SecurityManager#checkCreateClassLoader 184 */ URLClassLoader(URL[] urls, ClassLoader parent, URLStreamHandlerFactory factory)185 public URLClassLoader(URL[] urls, ClassLoader parent, 186 URLStreamHandlerFactory factory) { 187 super(parent); 188 // this is to make the stack depth consistent with 1.1 189 SecurityManager security = System.getSecurityManager(); 190 if (security != null) { 191 security.checkCreateClassLoader(); 192 } 193 ucp = new URLClassPath(urls, factory); 194 acc = AccessController.getContext(); 195 } 196 197 /* A map (used as a set) to keep track of closeable local resources 198 * (either JarFiles or FileInputStreams). We don't care about 199 * Http resources since they don't need to be closed. 200 * 201 * If the resource is coming from a jar file 202 * we keep a (weak) reference to the JarFile object which can 203 * be closed if URLClassLoader.close() called. Due to jar file 204 * caching there will typically be only one JarFile object 205 * per underlying jar file. 206 * 207 * For file resources, which is probably a less common situation 208 * we have to keep a weak reference to each stream. 209 */ 210 211 private WeakHashMap<Closeable,Void> 212 closeables = new WeakHashMap<>(); 213 214 /** 215 * Returns an input stream for reading the specified resource. 216 * If this loader is closed, then any resources opened by this method 217 * will be closed. 218 * 219 * <p> The search order is described in the documentation for {@link 220 * #getResource(String)}. </p> 221 * 222 * @param name 223 * The resource name 224 * 225 * @return An input stream for reading the resource, or {@code null} 226 * if the resource could not be found 227 * 228 * @since 1.7 229 */ getResourceAsStream(String name)230 public InputStream getResourceAsStream(String name) { 231 URL url = getResource(name); 232 try { 233 if (url == null) { 234 return null; 235 } 236 URLConnection urlc = url.openConnection(); 237 InputStream is = urlc.getInputStream(); 238 if (urlc instanceof JarURLConnection) { 239 JarURLConnection juc = (JarURLConnection)urlc; 240 JarFile jar = juc.getJarFile(); 241 synchronized (closeables) { 242 if (!closeables.containsKey(jar)) { 243 closeables.put(jar, null); 244 } 245 } 246 } else if (urlc instanceof sun.net.www.protocol.file.FileURLConnection) { 247 synchronized (closeables) { 248 closeables.put(is, null); 249 } 250 } 251 return is; 252 } catch (IOException e) { 253 return null; 254 } 255 } 256 257 /** 258 * Closes this URLClassLoader, so that it can no longer be used to load 259 * new classes or resources that are defined by this loader. 260 * Classes and resources defined by any of this loader's parents in the 261 * delegation hierarchy are still accessible. Also, any classes or resources 262 * that are already loaded, are still accessible. 263 * <p> 264 * In the case of jar: and file: URLs, it also closes any files 265 * that were opened by it. If another thread is loading a 266 * class when the {@code close} method is invoked, then the result of 267 * that load is undefined. 268 * <p> 269 * The method makes a best effort attempt to close all opened files, 270 * by catching {@link IOException}s internally. Unchecked exceptions 271 * and errors are not caught. Calling close on an already closed 272 * loader has no effect. 273 * <p> 274 * @throws IOException if closing any file opened by this class loader 275 * resulted in an IOException. Any such exceptions are caught internally. 276 * If only one is caught, then it is re-thrown. If more than one exception 277 * is caught, then the second and following exceptions are added 278 * as suppressed exceptions of the first one caught, which is then re-thrown. 279 * 280 * @throws SecurityException if a security manager is set, and it denies 281 * {@link RuntimePermission}{@code ("closeClassLoader")} 282 * 283 * @since 1.7 284 */ close()285 public void close() throws IOException { 286 SecurityManager security = System.getSecurityManager(); 287 if (security != null) { 288 security.checkPermission(new RuntimePermission("closeClassLoader")); 289 } 290 List<IOException> errors = ucp.closeLoaders(); 291 292 // now close any remaining streams. 293 294 synchronized (closeables) { 295 Set<Closeable> keys = closeables.keySet(); 296 for (Closeable c : keys) { 297 try { 298 c.close(); 299 } catch (IOException ioex) { 300 errors.add(ioex); 301 } 302 } 303 closeables.clear(); 304 } 305 306 if (errors.isEmpty()) { 307 return; 308 } 309 310 IOException firstex = errors.remove(0); 311 312 // Suppress any remaining exceptions 313 314 for (IOException error: errors) { 315 firstex.addSuppressed(error); 316 } 317 throw firstex; 318 } 319 320 /** 321 * Appends the specified URL to the list of URLs to search for 322 * classes and resources. 323 * <p> 324 * If the URL specified is {@code null} or is already in the 325 * list of URLs, or if this loader is closed, then invoking this 326 * method has no effect. 327 * 328 * @param url the URL to be added to the search path of URLs 329 */ addURL(URL url)330 protected void addURL(URL url) { 331 ucp.addURL(url); 332 } 333 334 /** 335 * Returns the search path of URLs for loading classes and resources. 336 * This includes the original list of URLs specified to the constructor, 337 * along with any URLs subsequently appended by the addURL() method. 338 * @return the search path of URLs for loading classes and resources. 339 */ getURLs()340 public URL[] getURLs() { 341 return ucp.getURLs(); 342 } 343 344 /** 345 * Finds and loads the class with the specified name from the URL search 346 * path. Any URLs referring to JAR files are loaded and opened as needed 347 * until the class is found. 348 * 349 * @param name the name of the class 350 * @return the resulting class 351 * @exception ClassNotFoundException if the class could not be found, 352 * or if the loader is closed. 353 * @exception NullPointerException if {@code name} is {@code null}. 354 */ findClass(final String name)355 protected Class<?> findClass(final String name) 356 throws ClassNotFoundException 357 { 358 final Class<?> result; 359 try { 360 result = AccessController.doPrivileged( 361 new PrivilegedExceptionAction<Class<?>>() { 362 public Class<?> run() throws ClassNotFoundException { 363 String path = name.replace('.', '/').concat(".class"); 364 Resource res = ucp.getResource(path, false); 365 if (res != null) { 366 try { 367 return defineClass(name, res); 368 } catch (IOException e) { 369 throw new ClassNotFoundException(name, e); 370 } 371 } else { 372 return null; 373 } 374 } 375 }, acc); 376 } catch (java.security.PrivilegedActionException pae) { 377 throw (ClassNotFoundException) pae.getException(); 378 } 379 if (result == null) { 380 throw new ClassNotFoundException(name); 381 } 382 return result; 383 } 384 385 /* 386 * Retrieve the package using the specified package name. 387 * If non-null, verify the package using the specified code 388 * source and manifest. 389 */ getAndVerifyPackage(String pkgname, Manifest man, URL url)390 private Package getAndVerifyPackage(String pkgname, 391 Manifest man, URL url) { 392 Package pkg = getPackage(pkgname); 393 if (pkg != null) { 394 // Package found, so check package sealing. 395 if (pkg.isSealed()) { 396 // Verify that code source URL is the same. 397 if (!pkg.isSealed(url)) { 398 throw new SecurityException( 399 "sealing violation: package " + pkgname + " is sealed"); 400 } 401 } else { 402 // Make sure we are not attempting to seal the package 403 // at this code source URL. 404 if ((man != null) && isSealed(pkgname, man)) { 405 throw new SecurityException( 406 "sealing violation: can't seal package " + pkgname + 407 ": already loaded"); 408 } 409 } 410 } 411 return pkg; 412 } 413 414 // Also called by VM to define Package for classes loaded from the CDS 415 // archive definePackageInternal(String pkgname, Manifest man, URL url)416 private void definePackageInternal(String pkgname, Manifest man, URL url) 417 { 418 if (getAndVerifyPackage(pkgname, man, url) == null) { 419 try { 420 if (man != null) { 421 definePackage(pkgname, man, url); 422 } else { 423 definePackage(pkgname, null, null, null, null, null, null, null); 424 } 425 } catch (IllegalArgumentException iae) { 426 // parallel-capable class loaders: re-verify in case of a 427 // race condition 428 if (getAndVerifyPackage(pkgname, man, url) == null) { 429 // Should never happen 430 throw new AssertionError("Cannot find package " + 431 pkgname); 432 } 433 } 434 } 435 } 436 437 /* 438 * Defines a Class using the class bytes obtained from the specified 439 * Resource. The resulting Class must be resolved before it can be 440 * used. 441 */ defineClass(String name, Resource res)442 private Class<?> defineClass(String name, Resource res) throws IOException { 443 long t0 = System.nanoTime(); 444 int i = name.lastIndexOf('.'); 445 URL url = res.getCodeSourceURL(); 446 if (i != -1) { 447 String pkgname = name.substring(0, i); 448 // Check if package already loaded. 449 Manifest man = res.getManifest(); 450 definePackageInternal(pkgname, man, url); 451 } 452 // Now read the class bytes and define the class 453 java.nio.ByteBuffer bb = res.getByteBuffer(); 454 if (bb != null) { 455 // Use (direct) ByteBuffer: 456 CodeSigner[] signers = res.getCodeSigners(); 457 CodeSource cs = new CodeSource(url, signers); 458 return defineClass(name, bb, cs); 459 } else { 460 byte[] b = res.getBytes(); 461 // must read certificates AFTER reading bytes. 462 CodeSigner[] signers = res.getCodeSigners(); 463 CodeSource cs = new CodeSource(url, signers); 464 return defineClass(name, b, 0, b.length, cs); 465 } 466 } 467 468 /** 469 * Defines a new package by name in this ClassLoader. The attributes 470 * contained in the specified Manifest will be used to obtain package 471 * version and sealing information. For sealed packages, the additional 472 * URL specifies the code source URL from which the package was loaded. 473 * 474 * @param name the package name 475 * @param man the Manifest containing package version and sealing 476 * information 477 * @param url the code source url for the package, or null if none 478 * @exception IllegalArgumentException if the package name duplicates 479 * an existing package either in this class loader or one 480 * of its ancestors 481 * @return the newly defined Package object 482 */ definePackage(String name, Manifest man, URL url)483 protected Package definePackage(String name, Manifest man, URL url) 484 throws IllegalArgumentException 485 { 486 String path = name.replace('.', '/').concat("/"); 487 String specTitle = null, specVersion = null, specVendor = null; 488 String implTitle = null, implVersion = null, implVendor = null; 489 String sealed = null; 490 URL sealBase = null; 491 492 Attributes attr = man.getAttributes(path); 493 if (attr != null) { 494 specTitle = attr.getValue(Name.SPECIFICATION_TITLE); 495 specVersion = attr.getValue(Name.SPECIFICATION_VERSION); 496 specVendor = attr.getValue(Name.SPECIFICATION_VENDOR); 497 implTitle = attr.getValue(Name.IMPLEMENTATION_TITLE); 498 implVersion = attr.getValue(Name.IMPLEMENTATION_VERSION); 499 implVendor = attr.getValue(Name.IMPLEMENTATION_VENDOR); 500 sealed = attr.getValue(Name.SEALED); 501 } 502 attr = man.getMainAttributes(); 503 if (attr != null) { 504 if (specTitle == null) { 505 specTitle = attr.getValue(Name.SPECIFICATION_TITLE); 506 } 507 if (specVersion == null) { 508 specVersion = attr.getValue(Name.SPECIFICATION_VERSION); 509 } 510 if (specVendor == null) { 511 specVendor = attr.getValue(Name.SPECIFICATION_VENDOR); 512 } 513 if (implTitle == null) { 514 implTitle = attr.getValue(Name.IMPLEMENTATION_TITLE); 515 } 516 if (implVersion == null) { 517 implVersion = attr.getValue(Name.IMPLEMENTATION_VERSION); 518 } 519 if (implVendor == null) { 520 implVendor = attr.getValue(Name.IMPLEMENTATION_VENDOR); 521 } 522 if (sealed == null) { 523 sealed = attr.getValue(Name.SEALED); 524 } 525 } 526 if ("true".equalsIgnoreCase(sealed)) { 527 sealBase = url; 528 } 529 return definePackage(name, specTitle, specVersion, specVendor, 530 implTitle, implVersion, implVendor, sealBase); 531 } 532 533 /* 534 * Returns true if the specified package name is sealed according to the 535 * given manifest. 536 */ isSealed(String name, Manifest man)537 private boolean isSealed(String name, Manifest man) { 538 String path = name.replace('.', '/').concat("/"); 539 Attributes attr = man.getAttributes(path); 540 String sealed = null; 541 if (attr != null) { 542 sealed = attr.getValue(Name.SEALED); 543 } 544 if (sealed == null) { 545 if ((attr = man.getMainAttributes()) != null) { 546 sealed = attr.getValue(Name.SEALED); 547 } 548 } 549 return "true".equalsIgnoreCase(sealed); 550 } 551 552 /** 553 * Finds the resource with the specified name on the URL search path. 554 * 555 * @param name the name of the resource 556 * @return a {@code URL} for the resource, or {@code null} 557 * if the resource could not be found, or if the loader is closed. 558 */ findResource(final String name)559 public URL findResource(final String name) { 560 /* 561 * The same restriction to finding classes applies to resources 562 */ 563 URL url = AccessController.doPrivileged( 564 new PrivilegedAction<URL>() { 565 public URL run() { 566 return ucp.findResource(name, true); 567 } 568 }, acc); 569 570 return url != null ? ucp.checkURL(url) : null; 571 } 572 573 /** 574 * Returns an Enumeration of URLs representing all of the resources 575 * on the URL search path having the specified name. 576 * 577 * @param name the resource name 578 * @exception IOException if an I/O exception occurs 579 * @return an {@code Enumeration} of {@code URL}s 580 * If the loader is closed, the Enumeration will be empty. 581 */ findResources(final String name)582 public Enumeration<URL> findResources(final String name) 583 throws IOException 584 { 585 final Enumeration<URL> e = ucp.findResources(name, true); 586 587 return new Enumeration<URL>() { 588 private URL url = null; 589 590 private boolean next() { 591 if (url != null) { 592 return true; 593 } 594 do { 595 URL u = AccessController.doPrivileged( 596 new PrivilegedAction<URL>() { 597 public URL run() { 598 if (!e.hasMoreElements()) 599 return null; 600 return e.nextElement(); 601 } 602 }, acc); 603 if (u == null) 604 break; 605 url = ucp.checkURL(u); 606 } while (url == null); 607 return url != null; 608 } 609 610 public URL nextElement() { 611 if (!next()) { 612 throw new NoSuchElementException(); 613 } 614 URL u = url; 615 url = null; 616 return u; 617 } 618 619 public boolean hasMoreElements() { 620 return next(); 621 } 622 }; 623 } 624 625 /** 626 * Returns the permissions for the given codesource object. 627 * The implementation of this method first calls super.getPermissions 628 * and then adds permissions based on the URL of the codesource. 629 * <p> 630 * If the protocol of this URL is "jar", then the permission granted 631 * is based on the permission that is required by the URL of the Jar 632 * file. 633 * <p> 634 * If the protocol is "file" and there is an authority component, then 635 * permission to connect to and accept connections from that authority 636 * may be granted. If the protocol is "file" 637 * and the path specifies a file, then permission to read that 638 * file is granted. If protocol is "file" and the path is 639 * a directory, permission is granted to read all files 640 * and (recursively) all files and subdirectories contained in 641 * that directory. 642 * <p> 643 * If the protocol is not "file", then permission 644 * to connect to and accept connections from the URL's host is granted. 645 * @param codesource the codesource 646 * @exception NullPointerException if {@code codesource} is {@code null}. 647 * @return the permissions granted to the codesource 648 */ getPermissions(CodeSource codesource)649 protected PermissionCollection getPermissions(CodeSource codesource) 650 { 651 PermissionCollection perms = super.getPermissions(codesource); 652 653 URL url = codesource.getLocation(); 654 655 Permission p; 656 URLConnection urlConnection; 657 658 try { 659 urlConnection = url.openConnection(); 660 p = urlConnection.getPermission(); 661 } catch (java.io.IOException ioe) { 662 p = null; 663 urlConnection = null; 664 } 665 666 if (p instanceof FilePermission) { 667 // if the permission has a separator char on the end, 668 // it means the codebase is a directory, and we need 669 // to add an additional permission to read recursively 670 String path = p.getName(); 671 if (path.endsWith(File.separator)) { 672 path += "-"; 673 p = new FilePermission(path, SecurityConstants.FILE_READ_ACTION); 674 } 675 } else if ((p == null) && (url.getProtocol().equals("file"))) { 676 String path = url.getFile().replace('/', File.separatorChar); 677 path = ParseUtil.decode(path); 678 if (path.endsWith(File.separator)) 679 path += "-"; 680 p = new FilePermission(path, SecurityConstants.FILE_READ_ACTION); 681 } else { 682 /** 683 * Not loading from a 'file:' URL so we want to give the class 684 * permission to connect to and accept from the remote host 685 * after we've made sure the host is the correct one and is valid. 686 */ 687 URL locUrl = url; 688 if (urlConnection instanceof JarURLConnection) { 689 locUrl = ((JarURLConnection)urlConnection).getJarFileURL(); 690 } 691 String host = locUrl.getHost(); 692 if (host != null && (host.length() > 0)) 693 p = new SocketPermission(host, 694 SecurityConstants.SOCKET_CONNECT_ACCEPT_ACTION); 695 } 696 697 // make sure the person that created this class loader 698 // would have this permission 699 700 if (p != null) { 701 final SecurityManager sm = System.getSecurityManager(); 702 if (sm != null) { 703 final Permission fp = p; 704 AccessController.doPrivileged(new PrivilegedAction<Void>() { 705 public Void run() throws SecurityException { 706 sm.checkPermission(fp); 707 return null; 708 } 709 }, acc); 710 } 711 perms.add(p); 712 } 713 return perms; 714 } 715 716 /** 717 * Creates a new instance of URLClassLoader for the specified 718 * URLs and parent class loader. If a security manager is 719 * installed, the {@code loadClass} method of the URLClassLoader 720 * returned by this method will invoke the 721 * {@code SecurityManager.checkPackageAccess} method before 722 * loading the class. 723 * 724 * @param urls the URLs to search for classes and resources 725 * @param parent the parent class loader for delegation 726 * @exception NullPointerException if {@code urls} is {@code null}. 727 * @return the resulting class loader 728 */ newInstance(final URL[] urls, final ClassLoader parent)729 public static URLClassLoader newInstance(final URL[] urls, 730 final ClassLoader parent) { 731 // Save the caller's context 732 final AccessControlContext acc = AccessController.getContext(); 733 // Need a privileged block to create the class loader 734 URLClassLoader ucl = AccessController.doPrivileged( 735 new PrivilegedAction<URLClassLoader>() { 736 public URLClassLoader run() { 737 return new FactoryURLClassLoader(urls, parent, acc); 738 } 739 }); 740 return ucl; 741 } 742 743 /** 744 * Creates a new instance of URLClassLoader for the specified 745 * URLs and default parent class loader. If a security manager is 746 * installed, the {@code loadClass} method of the URLClassLoader 747 * returned by this method will invoke the 748 * {@code SecurityManager.checkPackageAccess} before 749 * loading the class. 750 * 751 * @param urls the URLs to search for classes and resources 752 * @exception NullPointerException if {@code urls} is {@code null}. 753 * @return the resulting class loader 754 */ newInstance(final URL[] urls)755 public static URLClassLoader newInstance(final URL[] urls) { 756 // Save the caller's context 757 final AccessControlContext acc = AccessController.getContext(); 758 // Need a privileged block to create the class loader 759 URLClassLoader ucl = AccessController.doPrivileged( 760 new PrivilegedAction<URLClassLoader>() { 761 public URLClassLoader run() { 762 return new FactoryURLClassLoader(urls, acc); 763 } 764 }); 765 return ucl; 766 } 767 768 static { 769 /*sun.misc.SharedSecrets.setJavaNetAccess ( 770 new sun.misc.JavaNetAccess() { 771 public URLClassPath getURLClassPath (URLClassLoader u) { 772 return u.ucp; 773 } 774 775 public String getOriginalHostName(InetAddress ia) { 776 return ia.holder.getOriginalHostName(); 777 } 778 } 779 );*/ ClassLoader.registerAsParallelCapable()780 ClassLoader.registerAsParallelCapable(); 781 } 782 } 783 784 final class FactoryURLClassLoader extends URLClassLoader { 785 786 static { 787 ClassLoader.registerAsParallelCapable(); 788 } 789 790 FactoryURLClassLoader(URL[] urls, ClassLoader parent, 791 AccessControlContext acc) { 792 super(urls, parent, acc); 793 } 794 795 FactoryURLClassLoader(URL[] urls, AccessControlContext acc) { 796 super(urls, acc); 797 } 798 799 public final Class<?> loadClass(String name, boolean resolve) 800 throws ClassNotFoundException 801 { 802 // First check if we have permission to access the package. This 803 // should go away once we've added support for exported packages. 804 SecurityManager sm = System.getSecurityManager(); 805 if (sm != null) { 806 int i = name.lastIndexOf('.'); 807 if (i != -1) { 808 sm.checkPackageAccess(name.substring(0, i)); 809 } 810 } 811 return super.loadClass(name, resolve); 812 } 813 } 814