apache/hadoop · error · IllegalArgumentException

Collection<Key> may not be null

Error message

Collection<Key> may not be null

What it means

Error "Collection<Key> may not be null" thrown in apache/hadoop.

Source

Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/bloom/Filter.java:174

   * @param keys The list of keys.
   */
  public void add(List<Key> keys){
    if(keys == null) {
      throw new IllegalArgumentException("ArrayList<Key> may not be null");
    }

    for(Key key: keys) {
      add(key);
    }
  }//end add()

  /**
   * Adds a collection of keys to <i>this</i> filter.
   * @param keys The collection of keys.
   */
  public void add(Collection<Key> keys){
    if(keys == null) {
      throw new IllegalArgumentException("Collection<Key> may not be null");
    }
    for(Key key: keys) {
      add(key);
    }
  }//end add()

  /**
   * Adds an array of keys to <i>this</i> filter.
   * @param keys The array of keys.
   */
  public void add(Key[] keys){
    if(keys == null) {
      throw new IllegalArgumentException("Key[] may not be null");
    }
    for(int i = 0; i < keys.length; i++) {
      add(keys[i]);
    }
  }//end add()

View on GitHub (pinned to 2add963021)

Solutions

1. The Collection<Key> argument is null. Pass a non-null collection of keys.

When it happens

Trigger: Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/bloom/Filter.java:174 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/71c0fa51b06d1b4a. Report an issue: GitHub.