Program: 8146
Project: 8146
Buggy source:
private void populateTopicsConfig(final Ini conf){
  final Set<String> set=conf.keySet();
  final Set<String> newStatTopics=new TreeSet<String>();
  final List<String> newTopics=new ArrayList<String>();
  final Map<String,TopicConfig> newTopicConfigMap=new CopyOnWriteMap<String,TopicConfig>();
  for (  final String name : set) {
    if (name != null && name.startsWith("String_Node_Str")) {
      final Section section=conf.get(name);
      final String topic=name.substring("String_Node_Str".length());
      final TopicConfig topicConfig=new TopicConfig(topic,this);
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setNumPartitions(this.getInt(section,"String_Node_Str"));
      }
      boolean stat=false;
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        stat=Boolean.valueOf(section.get("String_Node_Str"));
        if (stat) {
          newStatTopics.add(topic);
        }
      }
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setDeletePolicy(section.get("String_Node_Str"));
      }
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setDeleteWhen(section.get("String_Node_Str"));
      }
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setDataPath(section.get("String_Node_Str"));
      }
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setUnflushInterval(this.getInt(section,"String_Node_Str"));
      }
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setUnflushThreshold(this.getInt(section,"String_Node_Str"));
      }
      if (!StringUtils.isBlank(section.get("String_Node_Str"))) {
        topicConfig.setAcceptSubscribe(this.getBoolean(section,"String_Node_Str"));
      }
      if (!StringUtils.isBlank(section.get("String_Node_Str"))) {
        topicConfig.setAcceptPublish(this.getBoolean(section,"String_Node_Str"));
      }
      newTopicConfigMap.put(topic,topicConfig);
      newTopics.add(topic);
    }
  }
  Collections.sort(newTopics);
  if (!newStatTopics.equals(this.statTopicSet)) {
    this.statTopicSet=newStatTopics;
    this.propertyChangeSupport.firePropertyChange("String_Node_Str",null,null);
  }
  if (!newTopicConfigMap.equals(this.topicConfigMap)) {
    this.topics=newTopics;
    this.topicConfigMap=newTopicConfigMap;
    this.propertyChangeSupport.firePropertyChange("String_Node_Str",null,null);
  }
  this.propertyChangeSupport.firePropertyChange("String_Node_Str",null,null);
}

Fixed version (ground truth):
private void populateTopicsConfig(final Ini conf){
  final Set<String> set=conf.keySet();
  final List<String> newTopics=new ArrayList<String>();
  final ConcurrentHashMap<String,TopicConfig> newTopicConfigMap=new ConcurrentHashMap<String,TopicConfig>();
  for (  final String name : set) {
    if (name != null && name.startsWith("String_Node_Str")) {
      final Section section=conf.get(name);
      final String topic=name.substring("String_Node_Str".length());
      final TopicConfig topicConfig=new TopicConfig(topic,this);
      Set<String> validKeySet=topicConfig.getFieldSet();
      Set<String> configKeySet=section.keySet();
      this.checkConfigKeys(configKeySet,validKeySet);
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setNumPartitions(this.getInt(section,"String_Node_Str"));
      }
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setStat(Boolean.valueOf(section.get("String_Node_Str")));
      }
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setDeletePolicy(section.get("String_Node_Str"));
      }
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setDeleteWhen(section.get("String_Node_Str"));
      }
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setDataPath(section.get("String_Node_Str"));
      }
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setUnflushInterval(this.getInt(section,"String_Node_Str"));
      }
      if (StringUtils.isNotBlank(section.get("String_Node_Str"))) {
        topicConfig.setUnflushThreshold(this.getInt(section,"String_Node_Str"));
      }
      if (!StringUtils.isBlank(section.get("String_Node_Str"))) {
        topicConfig.setAcceptSubscribe(this.getBoolean(section,"String_Node_Str"));
      }
      if (!StringUtils.isBlank(section.get("String_Node_Str"))) {
        topicConfig.setAcceptPublish(this.getBoolean(section,"String_Node_Str"));
      }
      newTopicConfigMap.put(topic,topicConfig);
      newTopics.add(topic);
    }
  }
  Collections.sort(newTopics);
  if (!newTopicConfigMap.equals(this.topicConfigMap)) {
    this.topics=newTopics;
    this.topicConfigMap=newTopicConfigMap;
    this.propertyChangeSupport.firePropertyChange("String_Node_Str",null,null);
    this.propertyChangeSupport.firePropertyChange("String_Node_Str",null,null);
  }
  this.propertyChangeSupport.firePropertyChange("String_Node_Str",null,null);
}