Added in API level 1

ClassNotFoundException

public class ClassNotFoundException
extends ReflectiveOperationException

java.lang.Object
   ↳ java.lang.Throwable
     ↳ java.lang.Exception
       ↳ java.lang.ReflectiveOperationException
         ↳ java.lang.ClassNotFoundException


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.

Summary

Public constructors

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.

Public methods

Throwable getException()

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

Inherited methods

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.

String getMessage()

Returns the detail message string of this throwable.

StackTraceElement[] getStackTrace()

Provides programmatic access to the stack trace information printed by 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(PrintWriter s)

Prints this throwable and its backtrace to the specified print writer.

void printStackTrace(PrintStream s)

Prints this throwable and its backtrace to the specified print stream.

void setStackTrace(StackTraceElement[] stackTrace)

Sets the stack trace elements that will be returned by getStackTrace() and printed by printStackTrace() and related methods.

String toString()

Returns a short description of this throwable.

Object clone()

Creates and returns a copy of this object.

boolean equals(Object obj)

Indicates whether some other object is "equal to" this one.

void finalize()

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

final Class<?> getClass()

Returns the runtime class of this Object.

int hashCode()

Returns a hash code value for the 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.

String toString()

Returns a string representation of the object.

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.

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()

Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public constructors

ClassNotFoundException

Added in API level 1
public ClassNotFoundException ()

Constructs a ClassNotFoundException with no detail message.

ClassNotFoundException

Added in API level 1
public ClassNotFoundException (String s)

Constructs a ClassNotFoundException with the specified detail message.

Parameters
s String: the detail message.

ClassNotFoundException

Added in API level 1
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 String: the detail message

ex Throwable: the exception that was raised while loading the class

Public methods

getException

Added in API level 1
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
Throwable the Exception that was raised while loading a class