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annotate test/runtime/7158988/FieldMonitor.java @ 5995:19e197e2a1af

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7158988: jvm crashes while debugging on x86_32 and x86_64 Summary: Object pointer is pushed more than once on stack, where GC doesn't expect it. Reviewed-by: coleenp, kvn Contributed-by: axel.siebenborn@sap.com
author coleenp
date Thu, 05 Apr 2012 12:17:52 -0400
parents
children a7f9a1195d86
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5995
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1 /*
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2 * Copyright 2012 SAP AG. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /*
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25 * @test FieldMonitor.java
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26 * @bug 7158988
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27 * @summary verify jvm does not crash while debugging
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28 * @run shell TestFieldMonitor.sh
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29 * @author axel.siebenborn@sap.com
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30 */
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31 import java.io.BufferedReader;
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32 import java.io.IOException;
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33 import java.io.InputStream;
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34 import java.io.InputStreamReader;
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35 import java.io.OutputStream;
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36 import java.io.OutputStreamWriter;
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37 import java.io.Reader;
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38 import java.io.Writer;
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39 import java.util.Iterator;
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40 import java.util.List;
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41 import java.util.Map;
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42
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43 import com.sun.jdi.Bootstrap;
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44 import com.sun.jdi.Field;
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45 import com.sun.jdi.ReferenceType;
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46 import com.sun.jdi.VirtualMachine;
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47 import com.sun.jdi.connect.Connector;
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48 import com.sun.jdi.connect.IllegalConnectorArgumentsException;
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49 import com.sun.jdi.connect.LaunchingConnector;
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50 import com.sun.jdi.connect.VMStartException;
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51 import com.sun.jdi.event.ClassPrepareEvent;
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52 import com.sun.jdi.event.Event;
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53 import com.sun.jdi.event.EventQueue;
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54 import com.sun.jdi.event.EventSet;
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55 import com.sun.jdi.event.ModificationWatchpointEvent;
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56 import com.sun.jdi.event.VMDeathEvent;
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57 import com.sun.jdi.event.VMDisconnectEvent;
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58 import com.sun.jdi.request.ClassPrepareRequest;
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59 import com.sun.jdi.request.EventRequest;
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60 import com.sun.jdi.request.EventRequestManager;
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61 import com.sun.jdi.request.ModificationWatchpointRequest;
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62
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63 public class FieldMonitor {
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64
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65 public static final String CLASS_NAME = "TestPostFieldModification";
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66 public static final String FIELD_NAME = "value";
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67 public static final String ARGUMENTS = "-Xshare:off -XX:+PrintGC";
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68
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69 public static void main(String[] args)
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70 throws IOException, InterruptedException {
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71
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72 StringBuffer sb = new StringBuffer();
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73
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74 for (int i=0; i < args.length; i++) {
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75 sb.append(' ');
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76 sb.append(args[i]);
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77 }
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78 //VirtualMachine vm = launchTarget(sb.toString());
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79 VirtualMachine vm = launchTarget(CLASS_NAME);
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80
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81 System.out.println("Vm launched");
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82 // set watch field on already loaded classes
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83 List<ReferenceType> referenceTypes = vm
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84 .classesByName(CLASS_NAME);
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85 for (ReferenceType refType : referenceTypes) {
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86 addFieldWatch(vm, refType);
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87 }
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88 // watch for loaded classes
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89 addClassWatch(vm);
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90
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91 // process events
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92 EventQueue eventQueue = vm.eventQueue();
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93 // resume the vm
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94
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95 Process process = vm.process();
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96
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97
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98 // Copy target's output and error to our output and error.
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99 Thread outThread = new StreamRedirectThread("out reader", process.getInputStream());
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100 Thread errThread = new StreamRedirectThread("error reader", process.getErrorStream());
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101
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102 errThread.start();
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103 outThread.start();
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104
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105
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106 vm.resume();
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107 boolean connected = true;
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108 while (connected) {
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109 EventSet eventSet = eventQueue.remove();
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110 for (Event event : eventSet) {
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111 if (event instanceof VMDeathEvent
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112 || event instanceof VMDisconnectEvent) {
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113 // exit
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114 connected = false;
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115 } else if (event instanceof ClassPrepareEvent) {
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116 // watch field on loaded class
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117 System.out.println("ClassPrepareEvent");
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118 ClassPrepareEvent classPrepEvent = (ClassPrepareEvent) event;
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119 ReferenceType refType = classPrepEvent
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120 .referenceType();
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121 addFieldWatch(vm, refType);
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122 } else if (event instanceof ModificationWatchpointEvent) {
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123 System.out.println("sleep for 500 ms");
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124 Thread.sleep(500);
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125 System.out.println("resume...");
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126
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127 ModificationWatchpointEvent modEvent = (ModificationWatchpointEvent) event;
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128 System.out.println("old="
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129 + modEvent.valueCurrent());
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130 System.out.println("new=" + modEvent.valueToBe());
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131 System.out.println();
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132 }
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133 }
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134 eventSet.resume();
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135 }
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136 // Shutdown begins when event thread terminates
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137 try {
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138 errThread.join(); // Make sure output is forwarded
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139 outThread.join();
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140 } catch (InterruptedException exc) {
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141 // we don't interrupt
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142 }
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143 }
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144
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145 /**
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146 * Find a com.sun.jdi.CommandLineLaunch connector
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147 */
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148 static LaunchingConnector findLaunchingConnector() {
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149 List <Connector> connectors = Bootstrap.virtualMachineManager().allConnectors();
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150 Iterator <Connector> iter = connectors.iterator();
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151 while (iter.hasNext()) {
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152 Connector connector = iter.next();
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153 if (connector.name().equals("com.sun.jdi.CommandLineLaunch")) {
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154 return (LaunchingConnector)connector;
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155 }
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156 }
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157 throw new Error("No launching connector");
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158 }
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159 /**
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160 * Return the launching connector's arguments.
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161 */
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162 static Map <String,Connector.Argument> connectorArguments(LaunchingConnector connector, String mainArgs) {
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163 Map<String,Connector.Argument> arguments = connector.defaultArguments();
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164 for (String key : arguments.keySet()) {
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165 System.out.println(key);
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166 }
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167
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168 Connector.Argument mainArg = (Connector.Argument)arguments.get("main");
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169 if (mainArg == null) {
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170 throw new Error("Bad launching connector");
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171 }
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172 mainArg.setValue(mainArgs);
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173
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174 Connector.Argument optionsArg = (Connector.Argument)arguments.get("options");
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175 if (optionsArg == null) {
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176 throw new Error("Bad launching connector");
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177 }
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178 optionsArg.setValue(ARGUMENTS);
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179 return arguments;
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180 }
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181
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182 static VirtualMachine launchTarget(String mainArgs) {
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183 LaunchingConnector connector = findLaunchingConnector();
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184 Map arguments = connectorArguments(connector, mainArgs);
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185 try {
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186 return (VirtualMachine) connector.launch(arguments);
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187 } catch (IOException exc) {
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188 throw new Error("Unable to launch target VM: " + exc);
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189 } catch (IllegalConnectorArgumentsException exc) {
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190 throw new Error("Internal error: " + exc);
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191 } catch (VMStartException exc) {
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192 throw new Error("Target VM failed to initialize: " +
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193 exc.getMessage());
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194 }
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195 }
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196
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197
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198 private static void addClassWatch(VirtualMachine vm) {
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199 EventRequestManager erm = vm.eventRequestManager();
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200 ClassPrepareRequest classPrepareRequest = erm
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201 .createClassPrepareRequest();
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202 classPrepareRequest.addClassFilter(CLASS_NAME);
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203 classPrepareRequest.setEnabled(true);
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204 }
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205
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206
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207 private static void addFieldWatch(VirtualMachine vm,
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208 ReferenceType refType) {
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209 EventRequestManager erm = vm.eventRequestManager();
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210 Field field = refType.fieldByName(FIELD_NAME);
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211 ModificationWatchpointRequest modificationWatchpointRequest = erm
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212 .createModificationWatchpointRequest(field);
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213 modificationWatchpointRequest.setSuspendPolicy(EventRequest.SUSPEND_EVENT_THREAD);
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214 modificationWatchpointRequest.setEnabled(true);
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215 }
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216 }
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217
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218 class StreamRedirectThread extends Thread {
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219
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220 private final BufferedReader in;
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221
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222 private static final int BUFFER_SIZE = 2048;
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223
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224 /**
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225 * Set up for copy.
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226 * @param name Name of the thread
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227 * @param in Stream to copy from
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228 * @param out Stream to copy to
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229 */
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230 StreamRedirectThread(String name, InputStream in) {
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231 super(name);
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232 this.in = new BufferedReader(new InputStreamReader(in));
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233 }
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234
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235 /**
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236 * Copy.
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237 */
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238 public void run() {
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239 try {
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240 String line;
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241 while ((line = in.readLine ()) != null) {
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242 System.out.println ("testvm: " + line);
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243 }
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244 System.out.flush();
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245 } catch(IOException exc) {
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246 System.err.println("Child I/O Transfer - " + exc);
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247 }
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248 }
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249 }