Program: 26536
Project: 26536
Buggy source:
@Override public Object[] callMethod(IComputerAccess computer,int methodId,Object[] arguments) throws Exception {
  boolean isCableCall=mySecurityManager.getCallerClassName(2) == "String_Node_Str";
  final DefinitionMethod methodDefinition=methods.get(methodId);
  if (methodDefinition != null) {
    if (methodDefinition.getCallType() == CallType.SCRIPT) {
      final TileEntity tile=worldObj.getBlockTileEntity(x,y,z);
      Object response=TypeConversionRegistry.toLua(methodDefinition.execute(tile,arguments));
      PostChangeRegistry.onPostChange(tile,methodDefinition,arguments);
      return new Object[]{response};
    }
    ArrayList<Object> args=new ArrayList(Arrays.asList(arguments));
    Class[] requiredParameters=methodDefinition.getRequiredParameters();
    HashMap<Integer,String> toReplace=methodDefinition.getReplacements();
    for (    Entry<Integer,String> replacement : toReplace.entrySet()) {
      String r=replacement.getValue();
      Object v=null;
      if (r.equals("String_Node_Str")) {
        v=x;
      }
 else       if (r.equals("String_Node_Str")) {
        v=y;
      }
 else       if (r.equals("String_Node_Str")) {
        v=z;
      }
 else       if (r.equals("String_Node_Str")) {
        v=worldObj;
      }
      if (v != null) {
        args.add(replacement.getKey(),v);
      }
    }
    if (args.size() != requiredParameters.length) {
      throw new Exception("String_Node_Str" + (requiredParameters.length - toReplace.size()));
    }
    for (int i=0; i < requiredParameters.length; i++) {
      Object converted=TypeConversionRegistry.fromLua(args.get(i),requiredParameters[i]);
      if (converted == null) {
        throw new Exception("String_Node_Str" + (i + 1));
      }
      args.set(i,converted);
    }
    for (int i=0; i < args.size(); i++) {
      ArrayList<IRestriction> restrictions=methodDefinition.getRestrictions(i);
      if (restrictions != null) {
        for (        IRestriction restriction : restrictions) {
          if (!restriction.isValid(args.get(i))) {
            throw new Exception(restriction.getErrorMessage(i + 1));
          }
        }
      }
    }
    final TileEntity tile=worldObj.getBlockTileEntity(x,y,z);
    final Object[] argsToUse=args.toArray(new Object[args.size()]);
    if (isCableCall) {
      Object response=TypeConversionRegistry.toLua(methodDefinition.execute(tile,argsToUse));
      PostChangeRegistry.onPostChange(tile,methodDefinition,argsToUse);
      return new Object[]{response};
    }
 else {
      Future callback=TickHandler.addTickCallback(tile.worldObj,new Callable(){
        @Override public Object call() throws Exception {
          Object response=TypeConversionRegistry.toLua(methodDefinition.execute(tile,argsToUse));
          PostChangeRegistry.onPostChange(tile,methodDefinition,argsToUse);
          return response;
        }
      }
);
      return new Object[]{callback.get()};
    }
  }
  return null;
}

Fixed version (ground truth):
@Override public Object[] callMethod(IComputerAccess computer,int methodId,Object[] arguments) throws Exception {
  boolean isCableCall=mySecurityManager.getCallerClassName(2) == "String_Node_Str";
  final DefinitionMethod methodDefinition=methods.get(methodId);
  if (methodDefinition != null) {
    if (methodDefinition.getCallType() == CallType.SCRIPT) {
      final TileEntity tile=worldObj.getBlockTileEntity(x,y,z);
      Object response=TypeConversionRegistry.toLua(methodDefinition.execute(tile,arguments));
      return new Object[]{response};
    }
    ArrayList<Object> args=new ArrayList(Arrays.asList(arguments));
    Class[] requiredParameters=methodDefinition.getRequiredParameters();
    HashMap<Integer,String> toReplace=methodDefinition.getReplacements();
    for (    Entry<Integer,String> replacement : toReplace.entrySet()) {
      String r=replacement.getValue();
      Object v=null;
      if (r.equals("String_Node_Str")) {
        v=x;
      }
 else       if (r.equals("String_Node_Str")) {
        v=y;
      }
 else       if (r.equals("String_Node_Str")) {
        v=z;
      }
 else       if (r.equals("String_Node_Str")) {
        v=worldObj;
      }
      if (v != null) {
        args.add(replacement.getKey(),v);
      }
    }
    if (args.size() != requiredParameters.length) {
      throw new Exception("String_Node_Str" + (requiredParameters.length - toReplace.size()));
    }
    for (int i=0; i < requiredParameters.length; i++) {
      Object converted=TypeConversionRegistry.fromLua(args.get(i),requiredParameters[i]);
      if (converted == null) {
        throw new Exception("String_Node_Str" + (i + 1));
      }
      args.set(i,converted);
    }
    for (int i=0; i < args.size(); i++) {
      ArrayList<IRestriction> restrictions=methodDefinition.getRestrictions(i);
      if (restrictions != null) {
        for (        IRestriction restriction : restrictions) {
          if (!restriction.isValid(args.get(i))) {
            throw new Exception(restriction.getErrorMessage(i + 1));
          }
        }
      }
    }
    final TileEntity tile=worldObj.getBlockTileEntity(x,y,z);
    final Object[] argsToUse=args.toArray(new Object[args.size()]);
    if (isCableCall) {
      Object response=TypeConversionRegistry.toLua(methodDefinition.execute(tile,argsToUse));
      PostChangeRegistry.onPostChange(tile,methodDefinition,argsToUse);
      return new Object[]{response};
    }
 else {
      Future callback=TickHandler.addTickCallback(tile.worldObj,new Callable(){
        @Override public Object call() throws Exception {
          Object response=TypeConversionRegistry.toLua(methodDefinition.execute(tile,argsToUse));
          PostChangeRegistry.onPostChange(tile,methodDefinition,argsToUse);
          return response;
        }
      }
);
      return new Object[]{callback.get()};
    }
  }
  return null;
}