TestController.java

package org.springframework.issues;

import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class TestController {

	@RequestMapping(value = "/test", method = RequestMethod.GET)
	@ResponseBody
	public String test(@RequestParam(value = "fq", required = false) String[] filterQuery) {
	    return "fq = " + StringUtils.arrayToDelimitedString(filterQuery, "|");
	}

}