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# 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.

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 the `Throwable.getCause()` method, as well as the aforementioned "legacy method."

See also:

- `Class.forName(java.lang.String)`
- `ClassLoader.findSystemClass(java.lang.String)`
- `ClassLoader.loadClass(java.lang.String, boolean)`

## 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` | `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.

### Inherited methods
From class `java.lang.Throwable`
`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.
From class `java.lang.Object`
`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 timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Public constructors

### 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` | `String`: 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` | `String`: the detail message
`ex` | `Throwable`: the exception that was raised while loading the class

## Public methods

### getCause

    public 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`).

Returns
`Throwable` | the cause of this exception.

### 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
`Throwable` | the `Exception` that was raised while loading a class

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