UnknownTreeException

java.lang.Object
- java.lang.Throwable
- - java.lang.Exception
  - - java.lang.RuntimeException
    - - jdk.nashorn.api.tree.UnknownTreeException

All Implemented Interfaces:

Serializable
```
public class UnknownTreeException
extends RuntimeException
```
Indicates that an unknown kind of Tree was encountered. This can occur if the language evolves and new kinds of Trees are added to the Tree hierarchy. May be thrown by a tree visitor to indicate that the visitor was created for a prior version of the language.

Since:

9

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

UnknownTreeException(Tree t, Object p)
Creates a new UnknownTreeException.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`getArgument()`	Returns the additional argument.
`Tree`	`getUnknownTree()`	Returns the unknown tree.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from class java.lang.Throwable
addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

- Constructor Detail
  - UnknownTreeException
```
public UnknownTreeException(Tree t,
                            Object p)
```
    Creates a new UnknownTreeException. The p parameter may be used to pass in an additional argument with information about the context in which the unknown element was encountered; for example, the visit methods of TreeVisitor may pass in their additional parameter.
    
    Parameters:
    
    t - the unknown tree, may be null
    
    p - an additional parameter, may be null
- Method Detail
  - getUnknownTree
```
public Tree getUnknownTree()
```
    Returns the unknown tree. The value may be unavailable if this exception has been serialized and then read back in.
    
    Returns:
    
    the unknown element, or null if unavailable
  - getArgument
```
public Object getArgument()
```
    Returns the additional argument. The value may be unavailable if this exception has been serialized and then read back in.
    
    Returns:
    
    the additional argument