HeadlessException (Java Platform SE 8 )
Keywords: java.awt.HeadlessException class
Date: 2026-06-25

java.awt

## Class HeadlessException

- java.lang.Object
- - java.lang.Throwable
  - - java.lang.Exception
    - - java.lang.RuntimeException
      - - java.lang.UnsupportedOperationException
        - - java.awt.HeadlessException

- All Implemented Interfaces:
    Serializable

      public class HeadlessException
      extends UnsupportedOperationException

  Thrown when code that is dependent on a keyboard, display, or mouse is called in an environment that does not support a keyboard, display, or mouse.
  Since:
    1.4
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `HeadlessException()`
    `HeadlessException(String msg)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `String` | `getMessage()` Returns the detail message string of this throwable.

    - ### Methods inherited from class java.lang.Throwable

      `addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### HeadlessException

          public HeadlessException()

    - #### HeadlessException

          public HeadlessException(String msg)

  - ### Method Detail

    - #### getMessage

          public String getMessage()

      Description copied from class: `Throwable`
      Returns the detail message string of this throwable.
      Overrides:
        `getMessage` in class `Throwable`
      Returns:
        the detail message string of this `Throwable` instance (which may be `null`).

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2026, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.