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Showing content from https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ClassNotFoundException.html below:

ClassNotFoundException (Java SE 17 & JDK 17)

All Implemented Interfaces:

Serializable

Thrown when an application tries to load in a class through its string name using:

• The forName method in class Class.
• The findSystemClass method in class ClassLoader .
• The loadClass method in class ClassLoader.

but no definition for the class with the specified name could be found.

Since:

1.0

See Also:

• Class.forName(java.lang.String)
• ClassLoader.findSystemClass(java.lang.String)
• ClassLoader.loadClass(java.lang.String, boolean)
• Serialized Form

• Constructor Summary

  Constructors

  Constructs a ClassNotFoundException with no detail message.

  Constructs a ClassNotFoundException with the specified detail message.

  Constructs a ClassNotFoundException with the specified detail message and optional exception that was raised while loading the class.

• Method Summary

  Returns the exception that was raised if an error occurred while attempting to load the class.

  Methods declared in class java.lang.ThrowableaddSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

• Constructor Details
  • ClassNotFoundException

    public ClassNotFoundException()

    Constructs a ClassNotFoundException with no detail message.

  • ClassNotFoundException public ClassNotFoundException(String s)

    Constructs a ClassNotFoundException with the specified detail message.

    Parameters:

    s - the detail message.

  • ClassNotFoundException

    Constructs a ClassNotFoundException with the specified detail message and optional exception that was raised while loading the class.

    Parameters:

    s - the detail message

    ex - the exception that was raised while loading the class

    Since:

    1.2

• Method Details
  • getException

    Returns the exception that was raised if an error occurred while attempting to load the class. Otherwise, returns null.

    API Note:

    This method predates the general-purpose exception chaining facility. The Throwable.getCause() method is now the preferred means of obtaining this information.

    Returns:

    the Exception that was raised while loading a class

    Since:

    1.2

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