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GeezerVison is showing docs.oracle.com — NullPointerException (Java SE 26 & JDK 26)

Class NullPointerException

java.lang.Object
java.lang.Throwable
java.lang.Exception
java.lang.RuntimeException
java.lang.NullPointerException
All Implemented Interfaces:
Serializable
public class NullPointerException extends RuntimeException
Thrown when an application attempts to use null in a case where an object is required. These include:
  • Calling the instance method of a null object.
  • Accessing or modifying the field of a null object.
  • Taking the length of null as if it were an array.
  • Accessing or modifying the slots of null as if it were an array.
  • Throwing null as if it were a Throwable value.

Applications should throw instances of this class to indicate other illegal uses of the null object. NullPointerException objects may be constructed by the virtual machine as if suppression were disabled and/or the stack trace was not writable.

Since:
1.0
See Also:
  • Serialized Form

  • Constructor Summary

    Constructors
    Constructor
    Description
    NullPointerException()
    Constructs a NullPointerException with no detail message.
    NullPointerException(String s)
    Constructs a NullPointerException with the specified detail message.

  • Method Summary

    Modifier and Type
    Method
    Description
    String
    getMessage()
    Returns the detail message string of this throwable.

    Methods declared in class Throwable

    addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString
    Modifier and Type
    Method
    Description
    final void
    addSuppressed(Throwable exception)
    Appends the specified exception to the exceptions that were suppressed in order to deliver this exception.
    Throwable
    fillInStackTrace()
    Fills in the execution stack trace.
    Throwable
    getCause()
    Returns the cause of this throwable or null if the cause is nonexistent or unknown.
    String
    getLocalizedMessage()
    Creates a localized description of this throwable.
    StackTraceElement[]
    getStackTrace()
    Provides programmatic access to the stack trace information printed by Throwable.printStackTrace().
    final Throwable[]
    getSuppressed()
    Returns an array containing all of the exceptions that were suppressed, typically by the try-with-resources statement, in order to deliver this exception.
    Throwable
    initCause(Throwable cause)
    Initializes the cause of this throwable to the specified value.
    void
    printStackTrace()
    Prints this throwable and its backtrace to the standard error stream.
    void
    printStackTrace(PrintStream s)
    Prints this throwable and its backtrace to the specified print stream.
    void
    printStackTrace(PrintWriter s)
    Prints this throwable and its backtrace to the specified print writer.
    void
    setStackTrace(StackTraceElement[] stackTrace)
    Sets the stack trace elements that will be returned by Throwable.getStackTrace() and printed by Throwable.printStackTrace() and related methods.
    String
    toString()
    Returns a short description of this throwable.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Creates and returns a copy of this object.
    boolean
    equals(Object obj)
    Indicates whether some other object is "equal to" this one.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    Finalization is deprecated and subject to removal in a future release.
    final Class<?>
    getClass()
    Returns the runtime class of this Object.
    int
    hashCode()
    Returns a hash code value for this object.
    final void
    notify()
    Wakes up a single thread that is waiting on this object's monitor.
    final void
    notifyAll()
    Wakes up all threads that are waiting on this object's monitor.
    final void
    wait()
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
    final void
    wait(long timeoutMillis)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
    final void
    wait(long timeoutMillis, int nanos)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

  • Constructor Details

    • NullPointerException

      public NullPointerException()
      Constructs a NullPointerException with no detail message.

    • NullPointerException

      public NullPointerException(String s)
      Constructs a NullPointerException with the specified detail message.
      Parameters:
      s - the detail message.

  • Method Details

    • getMessage

      public String getMessage()
      Returns the detail message string of this throwable.

      If a non-null message was supplied in a constructor it is returned. Otherwise, an implementation specific message or null is returned.

      Overrides:
      getMessage in class Throwable
      Implementation Note:
      If no explicit message was passed to the constructor, and as long as certain internal information is available, a verbose description of the null reference is returned. The internal information is not available in deserialized NullPointerExceptions.
      Returns:
      the detail message string, which may be null.
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