- java.lang.Object
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- java.lang.Throwable
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- java.lang.Exception
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- java.lang.ReflectiveOperationException
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- java.lang.ClassNotFoundException
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- 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 classClass
. - The
findSystemClass
method in classClassLoader
. - The
loadClass
method in classClassLoader
.
but no definition for the class with the specified name could be found.
As of release 1.4, this exception has been retrofitted to conform to the general purpose exception-chaining mechanism. The "optional exception that was raised while loading the class" that may be provided at construction time and accessed via the
getException()
method is now known as the cause, and may be accessed via theThrowable.getCause()
method, as well as the aforementioned "legacy method."
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Constructor Summary
Constructors Constructor and Description ClassNotFoundException()
Constructs aClassNotFoundException
with no detail message.ClassNotFoundException(String s)
Constructs aClassNotFoundException
with the specified detail message.ClassNotFoundException(String s, Throwable ex)
Constructs aClassNotFoundException
with the specified detail message and optional exception that was raised while loading the class.
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Method Summary
Methods Modifier and Type Method and Description Throwable
getCause()
Returns the cause of this exception (the exception that was raised if an error occurred while attempting to load the class; otherwise null).Throwable
getException()
Returns the exception that was raised if an error occurred while attempting to load the class.-
Methods inherited from class java.lang.Throwable
addSuppressed, fillInStackTrace, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString
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Constructor Detail
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ClassNotFoundException
public ClassNotFoundException()
Constructs aClassNotFoundException
with no detail message.
-
ClassNotFoundException
public ClassNotFoundException(String s)
Constructs aClassNotFoundException
with the specified detail message.- Parameters:
s
- the detail message.
-
ClassNotFoundException
public ClassNotFoundException(String s, Throwable ex)
Constructs aClassNotFoundException
with the specified detail message and optional exception that was raised while loading the class.- Parameters:
s
- the detail messageex
- the exception that was raised while loading the class- Since:
- 1.2
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Method Detail
-
getException
public Throwable getException()
Returns the exception that was raised if an error occurred while attempting to load the class. Otherwise, returns null.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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