Review

Map.get() may return null.

• missing/condition/null_check

org/apache/jackrabbit/webdav/jcr/JcrDavException.java

JcrDavException(RepositoryException)

class JcrDavException {
    /**
     * Same as {@link JcrDavException#JcrDavException(Throwable, int)} where the
     * error code is retrieved from an internal mapping.
     *
     * @param cause Cause of this DavException
     * @throws NullPointerException if the given exception is <code>null</code>.
     * @see JcrDavException#JcrDavException(Throwable, int)
     */
    public JcrDavException(RepositoryException cause) {
        this(cause, ((Integer)codeMap.get(cause.getClass())).intValue());
    }

}

class CheckMapGetNotNull {
  void pattern(HashMap codeMap, Class exceptionClass) {
    Integer code = (Integer) codeMap.get(exceptionClass);
    if (code != null) {
      code.intValue();
    }
  }
}