https://bz.apache.org/bugzilla/show_bug.cgi?id=69382
Bug ID: 69382
Summary: Inefficient code generated for <jsp:include>
Product: Tomcat 9
Version: 9.0.x
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Jasper
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: -----
This JSP fragment:
<jsp:include page="${feature.template}">
<jsp:param name="featureName" value="${feature.featureName}"/>
</jsp:include>
translates into a single, very long line of Java:
org.apache.jasper.runtime.JspRuntimeLibrary.include(request, response,
(java.lang.String)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate("${feature.template}",
java.lang.String.class, (javax.servlet.jsp.PageContext)_jspx_page_context,
null) + (((java.lang.String)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate("${feature.template}",
java.lang.String.class, (javax.servlet.jsp.PageContext)_jspx_page_context,
null)).indexOf('?')>0? '&': '?') +
org.apache.jasper.runtime.JspRuntimeLibrary.URLEncode("featureName",
request.getCharacterEncoding())+ "=" +
org.apache.jasper.runtime.JspRuntimeLibrary.URLEncode((java.lang.String)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate("${feature.featureName}",
java.lang.String.class, (javax.servlet.jsp.PageContext)_jspx_page_context,
null), request.getCharacterEncoding()), out, false);
Formatting is unhelpful, however there's a problem buried in there:
"${feature.template}" is evaluated twice, presumably with the same output both
times. The JSP snippet clearly does not intend two evaluations so it should be
possible to execute once and reuse the value.
In addition, there are two calls to request.getCharacterEncoding()... which
seems simple until our application wraps that value multiple layers deep:
ServletRequestWrapper
ServletRequestWrapper
ApplicationHttpRequest
ApplicationHttpRequest
ApplicationHttpRequest
ApplicationHttpRequest
RequestFacade
Request
Reusing this value would also be helpful.
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