Program: 32037
Project: 32037
Buggy source:
/** 
 * Returns the first notifiable bing rule which fulfills its condition with this event.
 * @param event the event
 * @return the first matched bing rule, null if none
 */
public BingRule fulfilledBingRule(Event event){
  if (null == event) {
    return null;
  }
  if (!mIsInitialized) {
    return null;
  }
  if ((null != event.getSender()) && TextUtils.equals(event.getSender(),mMyUserId)) {
    return null;
  }
  if (mRules != null) {
    for (    BingRule bingRule : mRules) {
      if (bingRule.isEnabled) {
        boolean isFullfilled=false;
        if (BingRule.RULE_ID_CONTAIN_USER_NAME.equals(bingRule.ruleId) || BingRule.RULE_ID_CONTAIN_DISPLAY_NAME.equals(bingRule.ruleId)) {
          if (Event.EVENT_TYPE_MESSAGE.equals(event.getType())) {
            Message message=JsonUtils.toMessage(event.getContent());
            MyUser myUser=mSession.getMyUser();
            String pattern=myUser.displayname;
            if (BingRule.RULE_ID_CONTAIN_USER_NAME.equals(bingRule.ruleId)) {
              if (mMyUserId.indexOf("String_Node_Str") >= 0) {
                pattern=mMyUserId.substring(1,mMyUserId.indexOf("String_Node_Str"));
              }
 else {
                pattern=mMyUserId;
              }
            }
            if (!TextUtils.isEmpty(pattern)) {
              isFullfilled=caseInsensitiveFind(pattern,message.body);
            }
          }
        }
 else         if (BingRule.RULE_ID_FALLBACK.equals(bingRule.ruleId)) {
          isFullfilled=true;
        }
 else {
          isFullfilled=eventMatchesConditions(event,bingRule.conditions);
        }
        if (isFullfilled) {
          return bingRule;
        }
      }
    }
    return null;
  }
 else {
    return mDefaultBingRule;
  }
}

Fixed version (ground truth):
/** 
 * Returns the first notifiable bing rule which fulfills its condition with this event.
 * @param event the event
 * @return the first matched bing rule, null if none
 */
public BingRule fulfilledBingRule(Event event){
  if (null == event) {
    return null;
  }
  if (!mIsInitialized) {
    return null;
  }
  if ((null != event.getSender()) && TextUtils.equals(event.getSender(),mMyUserId)) {
    return null;
  }
  if (mRules != null) {
    final ArrayList<BingRule> rules;
synchronized (this) {
      rules=new ArrayList<>(mRules);
    }
    for (    BingRule bingRule : rules) {
      if (bingRule.isEnabled) {
        boolean isFullfilled=false;
        if (BingRule.RULE_ID_CONTAIN_USER_NAME.equals(bingRule.ruleId) || BingRule.RULE_ID_CONTAIN_DISPLAY_NAME.equals(bingRule.ruleId)) {
          if (Event.EVENT_TYPE_MESSAGE.equals(event.getType())) {
            Message message=JsonUtils.toMessage(event.getContent());
            MyUser myUser=mSession.getMyUser();
            String pattern=myUser.displayname;
            if (BingRule.RULE_ID_CONTAIN_USER_NAME.equals(bingRule.ruleId)) {
              if (mMyUserId.indexOf("String_Node_Str") >= 0) {
                pattern=mMyUserId.substring(1,mMyUserId.indexOf("String_Node_Str"));
              }
 else {
                pattern=mMyUserId;
              }
            }
            if (!TextUtils.isEmpty(pattern)) {
              isFullfilled=caseInsensitiveFind(pattern,message.body);
            }
          }
        }
 else         if (BingRule.RULE_ID_FALLBACK.equals(bingRule.ruleId)) {
          isFullfilled=true;
        }
 else {
          isFullfilled=eventMatchesConditions(event,bingRule.conditions);
        }
        if (isFullfilled) {
          return bingRule;
        }
      }
    }
    return null;
  }
 else {
    return mDefaultBingRule;
  }
}