Program: 2817
Project: 2817
Buggy source:
protected void processCommand(String cmd){
  boolean bp;
  if (cmd.endsWith("String_Node_Str"))   cmd=cmd.substring(0,cmd.length() - 1);
  if (cmd.compareTo("String_Node_Str") == 0) {
    this.state=DebugState.CONNECTED;
    debugServer.send("String_Node_Str");
    debugCallback.connected();
  }
 else   if (cmd.compareTo("String_Node_Str") == 0) {
    this.state=DebugState.RUNNING;
    debugCallback.resumed();
  }
 else   if (cmd.compareTo("String_Node_Str") == 0) {
    this.state=DebugState.EXITED;
    debugCallback.exited();
  }
 else   if ((bp=cmd.startsWith("String_Node_Str")) || cmd.startsWith("String_Node_Str")) {
    this.state=bp ? DebugState.BREAKPOINT : DebugState.STEP;
    String[] brp=cmd.split("String_Node_Str");
    this.filePosition=brp[1].replace('|',':').replace('\\','/');
    this.linePosition=Integer.parseInt(brp[2]);
    this.classPosition=brp[3].replace('#',':');
    this.methodPosition=brp[4];
    if (bp)     debugCallback.breakpoint(this.filePosition,this.linePosition,this.classPosition,this.methodPosition);
 else     debugCallback.step(this.filePosition,this.linePosition,this.classPosition,this.methodPosition);
  }
 else   if (cmd.startsWith("String_Node_Str")) {
    debugCallback.evaluation(cmd.substring(3).replace("String_Node_Str","String_Node_Str"));
  }
 else   if (cmd.startsWith("String_Node_Str")) {
    String var=cmd.substring(4);
    String val="String_Node_Str";
    int val_idx=var.indexOf(':');
    if (val_idx >= 0) {
      val=var.substring(val_idx + 1).replace("String_Node_Str","String_Node_Str");
      try {
        var=URLDecoder.decode(var.substring(0,val_idx),"String_Node_Str");
      }
 catch (      UnsupportedEncodingException e) {
        var=var.substring(0,val_idx);
      }
    }
    debugCallback.evaluation(var,val);
  }
 else   if (cmd.startsWith("String_Node_Str")) {
    DebugVariableType vt=DebugVariableType.variableTypeById(cmd.charAt(2));
    String var=cmd.substring(4);
    String val="String_Node_Str";
    int val_idx=var.indexOf(':');
    if (val_idx >= 0) {
      val=var.substring(val_idx + 1).replace("String_Node_Str","String_Node_Str");
      var=var.substring(0,val_idx);
    }
    debugCallback.watch(vt,var,val);
  }
 else   if (cmd.startsWith("String_Node_Str")) {
    debugCallback.watchBOL(DebugVariableType.variableTypeById(cmd.charAt(7)));
  }
 else   if (cmd.startsWith("String_Node_Str")) {
    debugCallback.watchEOL(DebugVariableType.variableTypeById(cmd.charAt(5)));
  }
 else {
    debugCallback.unknown(cmd);
  }
}

Fixed version (ground truth):
protected void processCommand(String cmd){
  boolean bp;
  if (cmd.endsWith("String_Node_Str"))   cmd=cmd.substring(0,cmd.length() - 1);
  if (cmd.compareTo("String_Node_Str") == 0) {
    this.state=DebugState.CONNECTED;
    debugServer.send("String_Node_Str");
    debugCallback.connected();
  }
 else   if (cmd.compareTo("String_Node_Str") == 0) {
    this.state=DebugState.RUNNING;
    debugCallback.resumed();
  }
 else   if (cmd.compareTo("String_Node_Str") == 0) {
    this.state=DebugState.EXITED;
    debugCallback.exited();
  }
 else   if ((bp=cmd.startsWith("String_Node_Str")) || cmd.startsWith("String_Node_Str")) {
    this.state=bp ? DebugState.BREAKPOINT : DebugState.STEP;
    String[] brp=cmd.split("String_Node_Str");
    this.filePosition=brp[1].replace('|',':').replace('\\','/');
    this.linePosition=Integer.parseInt(brp[2]);
    this.classPosition=brp[3].replace('#',':');
    this.methodPosition=brp[4];
    if (bp)     debugCallback.breakpoint(this.filePosition,this.linePosition,this.classPosition,this.methodPosition);
 else     debugCallback.step(this.filePosition,this.linePosition,this.classPosition,this.methodPosition);
  }
 else   if (cmd.startsWith("String_Node_Str")) {
    boolean valid=cmd.charAt(4) == '0';
    String var=cmd.substring(6);
    String val="String_Node_Str";
    int val_idx=var.indexOf(':');
    if (val_idx >= 0) {
      val=var.substring(val_idx + 1);
      try {
        var=URLDecoder.decode(var.substring(0,val_idx),"String_Node_Str");
      }
 catch (      UnsupportedEncodingException e) {
        var=var.substring(0,val_idx);
      }
    }
    debugCallback.evaluation(valid,var,val);
  }
 else   if (cmd.startsWith("String_Node_Str")) {
    DebugVariableType vt=DebugVariableType.variableTypeById(cmd.charAt(2));
    String var=cmd.substring(4);
    String val="String_Node_Str";
    int val_idx=var.indexOf(':');
    if (val_idx >= 0) {
      val=var.substring(val_idx + 1).replace("String_Node_Str","String_Node_Str");
      var=var.substring(0,val_idx);
    }
    debugCallback.watch(vt,var,val);
  }
 else   if (cmd.startsWith("String_Node_Str")) {
    debugCallback.watchBOL(DebugVariableType.variableTypeById(cmd.charAt(7)));
  }
 else   if (cmd.startsWith("String_Node_Str")) {
    debugCallback.watchEOL(DebugVariableType.variableTypeById(cmd.charAt(5)));
  }
 else {
    debugCallback.unknown(cmd);
  }
}