[antlr-interest] ClassCastException in Custom CommonTree

[AZIZ NANTHAAMORNPHONG]

Hi,

I have created tree grammar and I have following

 ASTLabelType=MyAst;

I created a Class MyAst extends CommonTree.


And I also uses this following in the main method:



*final* TreeAdaptor adaptor = *new* CommonTreeAdaptor(){

*public* Object create(Token payload){

*return* *new* MyAst(payload);

}


However, I found the ClassCastException when encountered to the *UP node*.
How solve this problem?

Thank,
Z.