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    <p>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:</p> <pre><code>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(), "|")); } } </code></pre> <p>this is my SearchRequestParams class:</p> <pre><code>package test; public class SearchRequestParams { private String[] fq; public String[] getFq() { return fq; } public void setFq(String[] fq) { this.fq = fq; } } </code></pre> <p>and this is my simple spring configuration:</p> <pre><code>&lt;bean id="urlMapping" class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" /&gt; &lt;bean class="test.MyController" /&gt; &lt;bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"&gt; &lt;property name="prefix"&gt; &lt;value&gt;/WEB-INF/jsp/&lt;/value&gt; &lt;/property&gt; &lt;property name="suffix"&gt; &lt;value&gt;.jsp&lt;/value&gt; &lt;/property&gt; &lt;/bean&gt; </code></pre> <p>I've tested my code within tomcat 7.0.8; when I type <code>http://localhost:8080/testweb/test/params.htm?fq=foo,bar</code> I'm able to read in my log file this line: <code>DEBUG fq = foo,bar</code>. 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.</p> <p><strong>UPDATE / SOLUTION</strong><br> With your code I've reproduced the issue; you have the tag <code>&lt;mvc:annotation-driven /&gt;</code> in your dispatcher servlet configuration, so you silently use a default conversion service, instance of <code>FormattingConversionService</code>, which contains a default converter from <code>String</code> to <code>String[]</code> that uses comma as separator. You have to use a different conversion service bean containing your own converter from <code>String</code> to <code>String[]</code>. 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"):</p> <pre><code>import org.springframework.core.convert.converter.Converter; import org.springframework.util.StringUtils; public class CustomStringToArrayConverter implements Converter&lt;String, String[]&gt;{ @Override public String[] convert(String source) { return StringUtils.delimitedListToStringArray(source, ";"); } } </code></pre> <p>Then you have to specify this conversion service bean in your configuration:</p> <pre><code>&lt;mvc:annotation-driven conversion-service="conversionService" /&gt; &lt;bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean"&gt; &lt;property name="converters"&gt; &lt;list&gt; &lt;bean class="au.org.ala.testspringbinding.CustomStringToArrayConverter" /&gt; &lt;/list&gt; &lt;/property&gt; &lt;/bean&gt; </code></pre> <p>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 <code>String</code> to <code>String[]</code> (with comma as separator). ;-) </p>
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    1. COThanks for that. The code you pasted is basically what I'm using. I've still got the controller method in my webapp and I just tried it again and still see the "foo|bar" in my version. I'm now wondering if I'm getting one of those strange maven dependency problems as I have a dependency on a project that uses an older version of Spring. I'll make a brand new "bare" Spring project and try it out and report back.
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    2. COI just created a new Maven webapp (JEE 6) with Spring MVC 3.0.5 support (using Netbeans). I modified the pom a bit and created two classes as per this answer. Ran the webapp in both Jetty and tomcat (6.0.20) and I still get the output fq = foo|bar (I have the output going to the browser now). I've put the code up on Google Code here: svn checkout http://ala-hubs.googlecode.com/svn/trunk/testSpringBinding - would love to get to the bottom of this...
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    3. COWell, I'm glad to help you, let me see your code. I will post some news in a few hours.
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