Class ClassNotFoundException
- 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
forNamemethod in classClass. - The
findSystemClassmethod in classClassLoader. - The
loadClassmethod 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 aClassNotFoundExceptionwith no detail message.ClassNotFoundException(String s)Constructs aClassNotFoundExceptionwith the specified detail message.ClassNotFoundException(String s, Throwable ex)Constructs aClassNotFoundExceptionwith the specified detail message and optional exception that was raised while loading the class.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method and Description ThrowablegetCause()Returns the cause of this exception (the exception that was raised if an error occurred while attempting to load the class; otherwise null).ThrowablegetException()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
ClassNotFoundException
public ClassNotFoundException()
Constructs aClassNotFoundExceptionwith no detail message.
ClassNotFoundException
public ClassNotFoundException(String s)
Constructs aClassNotFoundExceptionwith the specified detail message.- Parameters:
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s- the detail message.
ClassNotFoundException
public ClassNotFoundException(String s, Throwable ex)
Constructs aClassNotFoundExceptionwith the specified detail message and optional exception that was raised while loading the class.- Parameters:
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s- the detail message -
ex- 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:
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the
Exceptionthat was raised while loading a class - Since:
- 1.2
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