[antlr-interest] i have a problem with multiplexing.Can anyone help me?

[=?gb2312?B?us6zrA==?=]

i've realized two separate grammars, one for java code analyse, the other for javadoc embedded in the java file.  Then i try to link them together using the 
technology multiplexing. The critical parts are as follows:
---------- in java.g ------------------
...

JAVADOC_OPEN:   "/**" 
               {
                    selector.select("javadocLexer");
                    
                    // create a parser to handle the javadoc comment
                    JavadocParser jdocparser = new JavadocParser(selector);
                    jdocparser.comment(); 
               };

...
---------- in javadoc.g ------------------
...

javadoc_comment
         : (options{greedy=true;}:STAR)*
           (  (AT)=>AT  javadoc_tag  |  description )
           javadoc_tags
           JAVADOC_CLOSE     //here without EOF, and i believe no need
           ;
...
...

JAVADOC_CLOSE: "*/" {selector.select("javaLexer");};
...

----------------------- Test.java---------------------------------

import java.io.*;
import antlr.CommonAST;
import antlr.collections.AST;
import antlr.debug.misc.ASTFrame;
import java.util.*;
import antlr.TokenStreamSelector;


class Test{
        
	public static void main(String[] args)
	{
		try {
	             TokenStreamSelector selector = new TokenStreamSelector();
			
		    JavaLexer mainLexer = new JavaLexer(
                                        new FileInputStream(args[0]));
		    mainLexer.selector = selector;
			
		    JavadocLexer docLexer = 
                             new JavadocLexer  (mainLexer.getInputState());
	             docLexer.selector = selector;
	                
	             selector.addInputStream(mainLexer, "javaLexer");
	             selector.addInputStream(docLexer, "javadocLexer");
	             selector.select("javaLexer");
	                
	             JavaParser parser = new JavaParser(selector);
		    parser.compilationUnit();
						
                }catch(Exception e) {
                	System.err.println("exception: "+e);
                }
         }
}
---------- java file for testing-------------------------------------------
package com;

import java.io.*;

//single-line comment

/*multi-line comment*/

public class A
{
    public A()
    {
    }
    
    /** 
     * javadoc comment
     *
     * @author hc
     * @version 1.0
     * @param i the first number
     * @param j the second number
     * @return the sum of two numbers
     * @cml my own defined javadoc tag for some special purpose
     */
    public int add(int i,int j)
    {
        return i+j;
    }
}
-----------------------------------------------------------------------------
Then i got the error message:
exception: line 24:5: expecting EOF, found 'public'


i've been bewildered by this problem for quite a few days and look forward to help.

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