ClassNotFoundException (Java SE 17 & JDK 17)

java.lang.Object

java.lang.Throwable

java.lang.Exception

java.lang.ReflectiveOperationException

java.lang.ClassNotFoundException

All Implemented Interfaces:: Serializable

public class ClassNotFoundException extends ReflectiveOperationException

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:

Constructor Summary

Constructors

Constructor

Description

ClassNotFoundException()

Constructs a ClassNotFoundException with no detail message.

ClassNotFoundException(String s)

Constructs a ClassNotFoundException with the specified detail message.

ClassNotFoundException(String s, Throwable ex)

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

Modifier and Type

Method

Description

Throwable

getException()

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

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

Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

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
  
  public ClassNotFoundException(String s, Throwable ex)
  
  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
  
  public Throwable 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