UserException (Java Card API, Classic Edition)

java.lang.Object
- java.lang.Throwable
- - java.lang.Exception
  - - javacard.framework.CardException
    - - javacard.framework.UserException

```
public class UserException
extends CardException
```
UserException represents a User exception. This class also provides a resource-saving mechanism (the throwIt() method) for user exceptions by using a Java Card runtime environment-owned instance.
Java Card runtime environment-owned instances of exception classes are temporary Java Card runtime environment Entry Point Objects and can be accessed from any applet context. References to these temporary objects cannot be stored in class variables or instance variables or array components. See Runtime Environment Specification, Java Card Platform, Classic Edition, section 6.2.1 for details.

Constructor Summary

Constructors
Constructor Description

UserException()
Constructs a UserException with reason = 0.

UserException(short reason)
Constructs a UserException with the specified reason.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`throwIt(short reason)`	Throws the Java Card runtime environment-owned instance of `UserException` with the specified reason.

Methods inherited from class javacard.framework.CardException
getReason, setReason

Methods inherited from class java.lang.Object
equals

- Constructor Detail
  - UserException
```
public UserException()
```
    Constructs a UserException with reason = 0. To conserve on resources use throwIt() to use the Java Card runtime environment-owned instance of this class.
  - UserException
```
public UserException(short reason)
```
    Constructs a UserException with the specified reason. To conserve on resources use throwIt() to use the Java Card runtime environment-owned instance of this class.
    
    Parameters:
    
    reason - the reason for the exception
- Method Detail
  - throwIt
```
public static void throwIt(short reason)
                    throws UserException
```
    Throws the Java Card runtime environment-owned instance of UserException with the specified reason.
    Java Card runtime environment-owned instances of exception classes are temporary Java Card runtime environment Entry Point Objects and can be accessed from any applet context. References to these temporary objects cannot be stored in class variables or instance variables or array components. See Runtime Environment Specification, Java Card Platform, Classic Edition, section 6.2.1 for details.
    
    Parameters:
    
    reason - the reason for the exception
    
    Throws:
    
    UserException - always