primefaces 推送服务报Uncaught SyntaxError: Unexpected token < in JSON at position 0

package com.sgpmss.myapp.core.beans;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;

public class COSRFilter implements Filter {

@Override
public void destroy() {

}

@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
((HttpServletResponse) response).setHeader("Access-Control-Allow-Origin", "*");
((HttpServletResponse) response).setHeader("Access-Control-Allow-Methods", "POST,GET,OPTIONS,PUT,DELETE");
filterChain.doFilter(request, response);
}

@Override
public void init(FilterConfig arg0) throws ServletException {
}

}