How to prevent parameter binding from interpreting commas in Spring 3.0.5?

I’ve tested your code: it’s unbelievable, but I can’t reproduce your issue. I’ve downloaded the latest version of spring (3.0.5), this is my controller:

package test;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/test/**")
public class MyController {

    private static final Logger logger = Logger.getLogger(MyController.class);

    @RequestMapping(value = "/test/params", method = RequestMethod.GET)
    public void test(SearchRequestParams requestParams, BindingResult result) {
    logger.debug("fq = " + StringUtils.join(requestParams.getFq(), "|"));
    }
}

this is my SearchRequestParams class:

package test;

public class SearchRequestParams {
    private String[] fq;

    public String[] getFq() {
    return fq;
    }

    public void setFq(String[] fq) {
    this.fq = fq;
    }
}

and this is my simple spring configuration:

<bean id="urlMapping" class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />

<bean class="test.MyController" />

<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix">
        <value>/WEB-INF/jsp/</value>
    </property>
    <property name="suffix">
        <value>.jsp</value>
    </property>
</bean>

I’ve tested my code within tomcat 7.0.8; when I type http://localhost:8080/testweb/test/params.htm?fq=foo,bar I’m able to read in my log file this line: DEBUG fq = foo,bar.
What are the the differences from my code to yours? Am I doing something wrong?
I’d like to help you, so if you have any doubts or if I can do some other tests for you, it will be a pleasure.

UPDATE / SOLUTION
With your code I’ve reproduced the issue; you have the tag <mvc:annotation-driven /> in your dispatcher servlet configuration, so you silently use a default conversion service, instance of FormattingConversionService, which contains a default converter from String to String[] that uses comma as separator.
You have to use a different conversion service bean containing your own converter from String to String[]. You should use a different separator, I’ve choosed to use “;” because it’s the separator commonly used into query string (“?first=1;second=2;third=3”):

import org.springframework.core.convert.converter.Converter;
import org.springframework.util.StringUtils;

public class CustomStringToArrayConverter implements Converter<String, String[]>{
   @Override
    public String[] convert(String source) {
        return StringUtils.delimitedListToStringArray(source, ";");
    }
}

Then you have to specify this conversion service bean in your configuration:

<mvc:annotation-driven conversion-service="conversionService" />

<bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
    <property name="converters">
        <list>
            <bean class="au.org.ala.testspringbinding.CustomStringToArrayConverter" />
        </list>
    </property>
</bean>

The issue has fixed, now you should check for any side effects. I hope you don’t need in your application the original conversion from String to String[] (with comma as separator). 😉

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