Program: 10253
Project: 10253
Buggy source:
public boolean execute(ScriptEntry scriptEntry){
  Matcher m;
  StringBuffer sb;
  if (scriptEntry.getCommandName().indexOf('%') != -1) {
    m=definition_pattern.matcher(scriptEntry.getCommandName());
    sb=new StringBuffer();
    while (m.find()) {
      String definition=scriptEntry.getResidingQueue().getDefinition(m.group(1));
      if (definition == null)       definition="String_Node_Str";
      m.appendReplacement(sb,definition.replace("String_Node_Str","String_Node_Str"));
    }
    m.appendTail(sb);
    scriptEntry.setCommandName(sb.toString());
  }
  AbstractCommand command=plugin.getCommandRegistry().get(scriptEntry.getCommandName());
  if (command == null) {
    dB.echoDebug(scriptEntry,DebugElement.Header,"String_Node_Str" + scriptEntry.getCommandName());
    dB.echoError(scriptEntry.getCommandName() + "String_Node_Str");
    dB.echoDebug(scriptEntry,DebugElement.Footer);
    return false;
  }
  if (scriptEntry.getPlayer() != null)   dB.echoDebug(scriptEntry,DebugElement.Header,"String_Node_Str" + scriptEntry.getCommandName() + "String_Node_Str"+ scriptEntry.getPlayer().getName());
 else   dB.echoDebug(scriptEntry,DebugElement.Header,"String_Node_Str" + scriptEntry.getCommandName() + (scriptEntry.getNPC() != null ? "String_Node_Str" + scriptEntry.getNPC().getName() : "String_Node_Str"));
  boolean keepGoing=true;
  try {
    if (command.getOptions().REQUIRED_ARGS > scriptEntry.getArguments().size())     throw new InvalidArgumentsException("String_Node_Str");
    if (scriptEntry.has_tags)     scriptEntry.setArguments(TagManager.fillArguments(scriptEntry.getArguments(),scriptEntry,true));
    List<String> newArgs=new ArrayList<String>();
    int nested_depth=0;
    boolean if_ignore=false;
    for (    aH.Argument arg : aH.interpret(scriptEntry.getArguments())) {
      if (arg.getValue().equals("String_Node_Str"))       nested_depth++;
      if (arg.getValue().equals("String_Node_Str"))       nested_depth--;
      if (nested_depth > 0) {
        newArgs.add(arg.raw_value);
        continue;
      }
      if (arg.raw_value.indexOf('%') != -1) {
        m=definition_pattern.matcher(arg.raw_value);
        sb=new StringBuffer();
        while (m.find()) {
          String definition=TagManager.EscapeOutput(scriptEntry.getResidingQueue().getDefinition(m.group(1)));
          if (definition == null)           definition="String_Node_Str";
          m.appendReplacement(sb,definition.replace("String_Node_Str","String_Node_Str"));
        }
        m.appendTail(sb);
        arg=aH.Argument.valueOf(sb.toString());
      }
      if (command.getName().equalsIgnoreCase("String_Node_Str") && DenizenAPI.getCurrentInstance().getCommandRegistry().get(arg.getValue()) != null)       if_ignore=true;
      if (arg.matchesPrefix("String_Node_Str") && !if_ignore) {
        dB.echoDebug(scriptEntry,"String_Node_Str" + arg.getValue());
        String value=TagManager.tag(scriptEntry.getPlayer(),scriptEntry.getNPC(),arg.getValue(),false,scriptEntry);
        dPlayer player=dPlayer.valueOf(value);
        if (player == null || !player.isValid()) {
          dB.echoError(value + "String_Node_Str");
          return false;
        }
        scriptEntry.setPlayer(player);
      }
 else       if (arg.matchesPrefix("String_Node_Str") && !if_ignore) {
        dB.echoDebug(scriptEntry,"String_Node_Str" + arg.getValue());
        String value=TagManager.tag(scriptEntry.getPlayer(),scriptEntry.getNPC(),arg.getValue(),false,scriptEntry);
        dNPC npc=dNPC.valueOf(value);
        if (npc == null || !npc.isValid()) {
          dB.echoError(value + "String_Node_Str");
          return false;
        }
        scriptEntry.setNPC(npc);
      }
 else       if (arg.matchesPrefix("String_Node_Str") && !if_ignore) {
        String saveName=TagManager.tag(scriptEntry.getPlayer(),scriptEntry.getNPC(),arg.getValue(),false,scriptEntry);
        dB.echoDebug(scriptEntry,"String_Node_Str" + saveName + "String_Node_Str");
        scriptEntry.getResidingQueue().holdScriptEntry(saveName,scriptEntry);
      }
 else       newArgs.add(arg.raw_value);
    }
    scriptEntry.setArguments(newArgs);
    scriptEntry.setArguments(TagManager.fillArguments(scriptEntry.getArguments(),scriptEntry,false));
    command.parseArgs(scriptEntry);
  }
 catch (  InvalidArgumentsException e) {
    keepGoing=false;
    dB.echoError("String_Node_Str");
    if (e.getMessage() != null && e.getMessage().length() > 0)     dB.log(ChatColor.YELLOW + "String_Node_Str" + ChatColor.WHITE+ "String_Node_Str"+ e.getMessage()+ "String_Node_Str");
    dB.log("String_Node_Str" + command.getUsageHint());
    dB.echoDebug(scriptEntry,DebugElement.Footer);
    scriptEntry.setFinished(true);
  }
catch (  Exception e) {
    keepGoing=false;
    dB.echoError("String_Node_Str");
    dB.echoError(e);
    dB.echoDebug(scriptEntry,DebugElement.Footer);
    scriptEntry.setFinished(true);
  }
 finally {
    if (keepGoing)     try {
      command.execute(scriptEntry);
    }
 catch (    Exception e) {
      dB.echoError("String_Node_Str");
      dB.echoError(e);
      scriptEntry.setFinished(true);
    }
  }
  return true;
}

Fixed version (ground truth):
public boolean execute(ScriptEntry scriptEntry){
  Matcher m;
  StringBuffer sb;
  if (scriptEntry.getCommandName().indexOf('%') != -1) {
    m=definition_pattern.matcher(scriptEntry.getCommandName());
    sb=new StringBuffer();
    while (m.find()) {
      String definition=scriptEntry.getResidingQueue().getDefinition(m.group(1));
      if (definition == null)       definition="String_Node_Str";
      m.appendReplacement(sb,definition.replace("String_Node_Str","String_Node_Str"));
    }
    m.appendTail(sb);
    scriptEntry.setCommandName(sb.toString());
  }
  AbstractCommand command=plugin.getCommandRegistry().get(scriptEntry.getCommandName());
  if (command == null) {
    dB.echoDebug(scriptEntry,DebugElement.Header,"String_Node_Str" + scriptEntry.getCommandName());
    dB.echoError(scriptEntry.getCommandName() + "String_Node_Str");
    dB.echoDebug(scriptEntry,DebugElement.Footer);
    return false;
  }
  if (scriptEntry.hasNPC() && scriptEntry.getNPC().getCitizen() == null)   scriptEntry.setNPC(null);
  if (scriptEntry.getPlayer() != null)   dB.echoDebug(scriptEntry,DebugElement.Header,"String_Node_Str" + scriptEntry.getCommandName() + "String_Node_Str"+ scriptEntry.getPlayer().getName());
 else   dB.echoDebug(scriptEntry,DebugElement.Header,"String_Node_Str" + scriptEntry.getCommandName() + (scriptEntry.getNPC() != null ? "String_Node_Str" + scriptEntry.getNPC().getName() : "String_Node_Str"));
  boolean keepGoing=true;
  try {
    if (command.getOptions().REQUIRED_ARGS > scriptEntry.getArguments().size())     throw new InvalidArgumentsException("String_Node_Str");
    if (scriptEntry.has_tags)     scriptEntry.setArguments(TagManager.fillArguments(scriptEntry.getArguments(),scriptEntry,true));
    List<String> newArgs=new ArrayList<String>();
    int nested_depth=0;
    boolean if_ignore=false;
    for (    aH.Argument arg : aH.interpret(scriptEntry.getArguments())) {
      if (arg.getValue().equals("String_Node_Str"))       nested_depth++;
      if (arg.getValue().equals("String_Node_Str"))       nested_depth--;
      if (nested_depth > 0) {
        newArgs.add(arg.raw_value);
        continue;
      }
      if (arg.raw_value.indexOf('%') != -1) {
        m=definition_pattern.matcher(arg.raw_value);
        sb=new StringBuffer();
        while (m.find()) {
          String definition=TagManager.EscapeOutput(scriptEntry.getResidingQueue().getDefinition(m.group(1)));
          if (definition == null)           definition="String_Node_Str";
          m.appendReplacement(sb,definition.replace("String_Node_Str","String_Node_Str"));
        }
        m.appendTail(sb);
        arg=aH.Argument.valueOf(sb.toString());
      }
      if (command.getName().equalsIgnoreCase("String_Node_Str") && DenizenAPI.getCurrentInstance().getCommandRegistry().get(arg.getValue()) != null)       if_ignore=true;
      if (arg.matchesPrefix("String_Node_Str") && !if_ignore) {
        dB.echoDebug(scriptEntry,"String_Node_Str" + arg.getValue());
        String value=TagManager.tag(scriptEntry.getPlayer(),scriptEntry.getNPC(),arg.getValue(),false,scriptEntry);
        dPlayer player=dPlayer.valueOf(value);
        if (player == null || !player.isValid()) {
          dB.echoError(value + "String_Node_Str");
          return false;
        }
        scriptEntry.setPlayer(player);
      }
 else       if (arg.matchesPrefix("String_Node_Str") && !if_ignore) {
        dB.echoDebug(scriptEntry,"String_Node_Str" + arg.getValue());
        String value=TagManager.tag(scriptEntry.getPlayer(),scriptEntry.getNPC(),arg.getValue(),false,scriptEntry);
        dNPC npc=dNPC.valueOf(value);
        if (npc == null || !npc.isValid()) {
          dB.echoError(value + "String_Node_Str");
          return false;
        }
        scriptEntry.setNPC(npc);
      }
 else       if (arg.matchesPrefix("String_Node_Str") && !if_ignore) {
        String saveName=TagManager.tag(scriptEntry.getPlayer(),scriptEntry.getNPC(),arg.getValue(),false,scriptEntry);
        dB.echoDebug(scriptEntry,"String_Node_Str" + saveName + "String_Node_Str");
        scriptEntry.getResidingQueue().holdScriptEntry(saveName,scriptEntry);
      }
 else       newArgs.add(arg.raw_value);
    }
    scriptEntry.setArguments(newArgs);
    scriptEntry.setArguments(TagManager.fillArguments(scriptEntry.getArguments(),scriptEntry,false));
    command.parseArgs(scriptEntry);
  }
 catch (  InvalidArgumentsException e) {
    keepGoing=false;
    dB.echoError("String_Node_Str");
    if (e.getMessage() != null && e.getMessage().length() > 0)     dB.log(ChatColor.YELLOW + "String_Node_Str" + ChatColor.WHITE+ "String_Node_Str"+ e.getMessage()+ "String_Node_Str");
    dB.log("String_Node_Str" + command.getUsageHint());
    dB.echoDebug(scriptEntry,DebugElement.Footer);
    scriptEntry.setFinished(true);
  }
catch (  Exception e) {
    keepGoing=false;
    dB.echoError("String_Node_Str");
    dB.echoError(e);
    dB.echoDebug(scriptEntry,DebugElement.Footer);
    scriptEntry.setFinished(true);
  }
 finally {
    if (keepGoing)     try {
      command.execute(scriptEntry);
    }
 catch (    Exception e) {
      dB.echoError("String_Node_Str");
      dB.echoError(e);
      scriptEntry.setFinished(true);
    }
  }
  return true;
}