UnknownTreeException (Java SE 12 & JDK 12 )

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

All Implemented Interfaces:

Serializable
```
@Deprecated(since="11",
            forRemoval=true)
public class UnknownTreeException
extends RuntimeException
```
Deprecated, for removal: This API element is subject to removal in a future version.
Nashorn JavaScript script engine and APIs, and the jjs tool are deprecated with the intent to remove them in a future release.

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)`	Deprecated, for removal: This API element is subject to removal in a future version. Creates a new `UnknownTreeException`.

Method Summary

Modifier and Type	Method	Description
`Object`	`getArgument()`	Deprecated, for removal: This API element is subject to removal in a future version. Returns the additional argument.
`Tree`	`getUnknownTree()`	Deprecated, for removal: This API element is subject to removal in a future version. Returns the unknown tree.

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

Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - UnknownTreeException
```
public UnknownTreeException(Tree t,
                            Object p)
```
    Deprecated, for removal: This API element is subject to removal in a future version.
    
    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()
```
    Deprecated, for removal: This API element is subject to removal in a future version.
    
    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()
```
    Deprecated, for removal: This API element is subject to removal in a future version.
    
    Returns the additional argument. The value may be unavailable if this exception has been serialized and then read back in.
    
    Returns:
    
    the additional argument