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springjspjsp-tags

Spring JSP variable not assigned

I have in my JSP page code like this:

<spring:url value="" var="url"/>
<a href="<c:url value="/change_locale?locale=EN&current=${url}" />">EN</a>

And issue is that parameter url in link is always set to empty String.I would expect that if I type url like localhost:8080/test the url variable will hold this value and it will be replaced in link so it would look like /change_locale?locale=EN&current=test. However it is always generated like /change_locale?locale=EN&current=.What I am doing wrong? Best regards

Solution

  • In

    <spring:url value="" var="url"/>

    Your value value is the empty String. Because of this, the URL is relative.

    Spring uses UrlTag to construct the value from a <url> tag. You'll want to take a look at its createUrl method in the source code if you're curious.

    In this case, it will generate a value that is the empty String and store it in a page scope attribute named url. That's what you get when rendering

    ${url}