@SuppressWarnings("all") public static void replace(Debugger debugger, File classFile, String className) { VirtualMachine vm = debugger.getVm(); if (vm == null) return; if (!vm.canRedefineClasses()) return; byte[] classBytes = loadClassFile(classFile); if (classBytes == null) return; List classes = vm.classesByName(className); if (classes == null || classes.size() == 0) return; for (int i = 0; i < classes.size(); i++) { ReferenceType refType = (ReferenceType) classes.get(i); HashMap map = new HashMap(); map.put(refType, classBytes); vm.redefineClasses(map); } }
@Override public boolean canRedefineClasses() { return virtualMachine.canRedefineClasses(); }
/** * Perform the 'hotswap' command. * * @param session JSwat session on which to operate. * @param args Tokenized string of command arguments. * @param out Output to write messages to. */ public void perform(Session session, CommandArguments args, Log out) { if (!session.isActive()) { throw new CommandException(Bundle.getString("noActiveSession")); } if (!args.hasMoreTokens()) { throw new MissingArgumentsException(); } // Name of class is required; name of .class file is optional. String cname = args.nextToken(); String cfile = null; if (args.hasMoreTokens()) { cfile = args.nextToken(); } // Find the ReferenceType for this class. VirtualMachine vm = session.getConnection().getVM(); List classes = vm.classesByName(cname); if (classes.size() == 0) { throw new CommandException(Bundle.getString("hotswap.noSuchClass")); } ReferenceType clazz = (ReferenceType) classes.get(0); // Did the user give us a .class file? InputStream is = null; if (cfile == null) { // Try to find the .class file. PathManager pathman = (PathManager) session.getManager(PathManager.class); SourceSource src = pathman.mapClass(clazz); if (src == null) { throw new CommandException(Bundle.getString("hotswap.fileNotFound")); } is = src.getInputStream(); } else { // A filename was given, just open it. try { is = new FileInputStream(cfile); } catch (FileNotFoundException fnfe) { throw new CommandException(Bundle.getString("hotswap.fileNotFound")); } } // Do the actual hotswap operation. try { Classes.hotswap(clazz, is, vm); out.writeln(Bundle.getString("hotswap.success")); } catch (UnsupportedOperationException uoe) { if (!vm.canRedefineClasses()) { throw new CommandException(Bundle.getString("hotswap.noHotSwap")); } else if (!vm.canAddMethod()) { throw new CommandException(Bundle.getString("hotswap.noAddMethod")); } else if (!vm.canUnrestrictedlyRedefineClasses()) { throw new CommandException(Bundle.getString("hotswap.noUnrestricted")); } else { throw new CommandException(Bundle.getString("hotswap.unsupported")); } } catch (IOException ioe) { throw new CommandException(Bundle.getString("hotswap.errorReadingFile") + ' ' + ioe); } catch (NoClassDefFoundError ncdfe) { throw new CommandException(Bundle.getString("hotswap.wrongClass")); } catch (VerifyError ve) { throw new CommandException(Bundle.getString("hotswap.verifyError") + ' ' + ve); } catch (UnsupportedClassVersionError ucve) { throw new CommandException(Bundle.getString("hotswap.versionError") + ' ' + ucve); } catch (ClassFormatError cfe) { throw new CommandException(Bundle.getString("hotswap.formatError") + ' ' + cfe); } catch (ClassCircularityError cce) { throw new CommandException(Bundle.getString("hotswap.circularity") + ' ' + cce); } finally { if (is != null) { try { is.close(); } catch (IOException ioe) { } } } } // perform
protected boolean calcValue() { return myVersionHigher_14 && myVirtualMachine.canRedefineClasses(); }