Program: 55503
Project: 55503
Buggy source:
public void afterPropertiesSet() throws Exception {
  String currentInstanceId=this.instanceIdProvider.getCurrentInstanceId();
  if (this.resolveUserDataForInstance) {
    this.instanceUserAttributes=new HashMap<String,String>();
    DescribeInstanceAttributeResult attributes=this.getAmazonEC2().describeInstanceAttribute(new DescribeInstanceAttributeRequest(currentInstanceId,USER_DATA_ATTRIBUTE_NAME));
    String encodedUserData=attributes.getInstanceAttribute().getUserData();
    if (StringUtils.hasText(encodedUserData)) {
      byte[] bytes=Base64.decodeBase64(encodedUserData);
      String userData=new String(bytes,this.userDataAttributeEncoding);
      String[] userDataAttributes=userData.split(this.userDataAttributeSeparator);
      for (      String userDataAttribute : userDataAttributes) {
        String[] userDataAttributesParts=StringUtils.split(userDataAttribute,this.valueSeparator);
        String key=userDataAttributesParts[0];
        String value=userDataAttributesParts[1];
        this.instanceUserAttributes.put(key,value);
      }
    }
  }
  if (this.resolveUserTagsForInstance) {
    this.instanceUserTags=new HashMap<String,String>();
    DescribeInstancesResult describeInstancesResult=this.getAmazonEC2().describeInstances(new DescribeInstancesRequest().withInstanceIds(currentInstanceId));
    for (    Reservation reservation : describeInstancesResult.getReservations()) {
      for (      Instance instance : reservation.getInstances()) {
        if (instance.getInstanceId().equals(currentInstanceId)) {
          for (          Tag tag : instance.getTags()) {
            this.instanceUserTags.put(tag.getKey(),tag.getValue());
          }
          break;
        }
      }
    }
  }
}

Fixed version (ground truth):
public void afterPropertiesSet() throws Exception {
  String currentInstanceId=this.instanceIdProvider.getCurrentInstanceId();
  if (this.resolveUserDataForInstance) {
    this.instanceUserAttributes=new HashMap<String,String>();
    DescribeInstanceAttributeResult attributes=this.getAmazonEC2().describeInstanceAttribute(new DescribeInstanceAttributeRequest(currentInstanceId,USER_DATA_ATTRIBUTE_NAME));
    if (attributes != null) {
      String encodedUserData=attributes.getInstanceAttribute().getUserData();
      if (StringUtils.hasText(encodedUserData)) {
        byte[] bytes=Base64.decodeBase64(encodedUserData);
        String userData=new String(bytes,this.userDataAttributeEncoding);
        String[] userDataAttributes=userData.split(this.userDataAttributeSeparator);
        for (        String userDataAttribute : userDataAttributes) {
          String[] userDataAttributesParts=StringUtils.split(userDataAttribute,this.valueSeparator);
          String key=userDataAttributesParts[0];
          String value=userDataAttributesParts[1];
          this.instanceUserAttributes.put(key,value);
        }
      }
    }
  }
  if (this.resolveUserTagsForInstance) {
    this.instanceUserTags=new HashMap<String,String>();
    DescribeInstancesResult describeInstancesResult=this.getAmazonEC2().describeInstances(new DescribeInstancesRequest().withInstanceIds(currentInstanceId));
    for (    Reservation reservation : describeInstancesResult.getReservations()) {
      for (      Instance instance : reservation.getInstances()) {
        if (instance.getInstanceId().equals(currentInstanceId)) {
          for (          Tag tag : instance.getTags()) {
            this.instanceUserTags.put(tag.getKey(),tag.getValue());
          }
          break;
        }
      }
    }
  }
}