Using JSP Tags in Grace

Grace Version

• Grace 2022.2.6

Tip

If you want to use JSP tags in Grace 2023.0.0, please checkout branch 2023.0.x.

Using JSP Tag Libraries

In order to use JSP support you must ensure you have the grace-web-jsp dependency on your classpath by adding it to your build.gradle file:

dependencies {

    // Using JSP tags
    runtimeOnly "org.graceframework:grace-web-jsp"
    // JSTL standard library is no longer added as a dependency by default
    runtimeOnly "jakarta.servlet.jsp:jakarta.servlet.jsp-api:2.3.6"
    runtimeOnly "jakarta.servlet.jsp.jstl:jakarta.servlet.jsp.jstl-api:1.2.7"
    runtimeOnly "org.glassfish.web:jakarta.servlet.jsp.jstl:1.2.6"

}

First you shoud configure Grace to scan for the JSP tld files,

grails:
    gsp:
        tldScanPattern: 'classpath*:/META-INF/*.tld'

Declare the JSP taglib to use with the taglib directive at the top of your GSP file:

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>

Now you can use JSP tags like any other tag:

<fmt:formatNumber value="10" pattern=".00" />

<c:set var="balance" value="12100.2509" />
<fmt:formatNumber value="${balance}" type ="currency" />

<c:set var="salary" scope="page" value="${2000 * 2}" />
<c:if test="${salary > 2000}">
    My salary is:  <c:out value="${salary}"/>
</c:if>

Links

• Grace Framework
• Grace Plugins
• Grace Guides