Program: 44726
Project: 44726
Buggy source:
public synchronized void renameInstance(String oldName,String newName) throws Exception {
  if (instances.get(newName) != null) {
    throw new IllegalArgumentException("String_Node_Str" + newName + "String_Node_Str");
  }
  Instance instance=instances.get(oldName);
  if (instance == null) {
    throw new IllegalArgumentException("String_Node_Str" + oldName + "String_Node_Str");
  }
  if (instance.isRoot()) {
    throw new IllegalArgumentException("String_Node_Str");
  }
  if (instance.getPid() != 0) {
    throw new IllegalStateException("String_Node_Str");
  }
  println(Ansi.ansi().a("String_Node_Str").a(Ansi.Attribute.INTENSITY_BOLD).a(oldName).a(Ansi.Attribute.RESET).a("String_Node_Str").a(Ansi.Attribute.INTENSITY_BOLD).a(newName).toString());
  instances.remove(oldName);
  instance.setName(newName);
  String oldLocationPath=instance.getLocation();
  File oldLocation=new File(oldLocationPath);
  String basedir=oldLocation.getParent();
  File newLocation=new File(basedir,newName);
  oldLocation.renameTo(newLocation);
  instance.setLocation(newLocation.getPath());
  HashMap<String,String> props=new HashMap<String,String>();
  props.put(oldName,newName);
  props.put(oldLocationPath,newLocation.getPath());
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  instances.put(newName,instance);
  saveState();
}

Fixed version (ground truth):
public synchronized void renameInstance(String oldName,String newName) throws Exception {
  if (instances.get(newName) != null) {
    throw new IllegalArgumentException("String_Node_Str" + newName + "String_Node_Str");
  }
  Instance instance=instances.get(oldName);
  if (instance == null) {
    throw new IllegalArgumentException("String_Node_Str" + oldName + "String_Node_Str");
  }
  if (instance.isRoot()) {
    throw new IllegalArgumentException("String_Node_Str");
  }
  if (instance.getPid() != 0) {
    throw new IllegalStateException("String_Node_Str");
  }
  println(Ansi.ansi().a("String_Node_Str").a(Ansi.Attribute.INTENSITY_BOLD).a(oldName).a(Ansi.Attribute.RESET).a("String_Node_Str").a(Ansi.Attribute.INTENSITY_BOLD).a(newName).a(Ansi.Attribute.RESET).toString());
  instances.remove(oldName);
  instance.setName(newName);
  String oldLocationPath=instance.getLocation();
  File oldLocation=new File(oldLocationPath);
  String basedir=oldLocation.getParent();
  File newLocation=new File(basedir,newName);
  oldLocation.renameTo(newLocation);
  instance.setLocation(newLocation.getPath());
  HashMap<String,String> props=new HashMap<String,String>();
  props.put(oldName,newName);
  props.put(oldLocationPath,newLocation.getPath());
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  filterResource(newLocation,"String_Node_Str",props);
  instances.put(newName,instance);
  saveState();
}