Serious OGNL Performance Issues
-------------------------------
Key: WW-2998
URL: https://issues.apache.org/struts/browse/WW-2998
Project: Struts 2
Issue Type: Improvement
Components: Expression Language
Affects Versions: 2.0.11
Environment: Windows XP 5.1 (2Gb, dual-core 1.8GHz), Java 1.5.0_08,
Tomcat 5.5
Reporter: Matthew Seaborn
I am currently running Struts 2.0.11 (planning to upgrade soon) with OGNL
2.6.11 and am having significant trouble with the appalling performance of
OGNL.
The following XML using Struts 2 Tags and OGNL takes (using the s2 profiling)
2328ms to render
<%@ page contentType="text/xml" %><%--
--%><%@ taglib prefix="s" uri="/struts-tags" %><%--
--%><%@ taglib uri="http://java.sun.com/jsp/jstl/core"; prefix="c" %><%--
--%><?xml version="1.0" ?>
<response>
<entities>
<s:iterator value="entities" id="entity">
<entity <%--
--%>id="<s:property value="id"/>" <%--
--%>name="<s:property value="name"/>" <%--
--%>externalId="<s:property value="externalId"/>" <%--
--%>color="<s:property value="renderColor"/>" <%--
--%>image="<s:property value="image.path"/>" <%--
--%>includeInKey="<s:property value="includeInKey"/>" <%--
--%>orderRank="<s:property value="orderRank"/>" <%--
--%> />
</s:iterator>
</entities>
</response>
The exact same functionality, using JSTL tags and EL, takes 15ms
<%@ page contentType="text/xml" %><%--
--%><%@ taglib prefix="s" uri="/struts-tags" %><%--
--%><%@ taglib uri="http://java.sun.com/jsp/jstl/core"; prefix="c" %><%--
--%><?xml version="1.0" ?>
<response>
<entities>
<c:forEach items="${entities}" var="entity">
<entity <%--
--%>id="<c:out value="${entity.id}"/>" <%--
--%>name="<c:out value="${entity.name}"/>" <%--
--%>externalId="<c:out value="${entity.externalId}"/>" <%--
--%>color="<c:out value="${entity.renderColor}"/>" <%--
--%>image="<c:out value="${entity.image.path}"/>" <%--
--%>includeInKey="<c:out value="${entity.includeInKey}"/>"
<%--
--%>orderRank="<c:out value="${entity.orderRank}"/>" <%--
--%> />
</c:forEach>
</entities>
</response>
In this case the S2/OGNL is 150x (!!!!!) slower than the JSTL/EL approach. Now
clearly in this case I can simply use the JSTL/EL approach to get decent
performance, but when using S2's Freemarker based tags I don't get that option.
Is this really as fast as OGNL can go, or there some optimisation/option I am
missing?
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