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https://issues.apache.org/jira/browse/WW-4194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13777188#comment-13777188
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Lukasz Lenart commented on WW-4194:
-----------------------------------
I have got that: {{NULL NOT NULL}} - on Jetty
> Using findValue() for value stack to retrieve component parameters always
> returns not-null object for any parameter name
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: WW-4194
> URL: https://issues.apache.org/jira/browse/WW-4194
> Project: Struts 2
> Issue Type: Bug
> Affects Versions: 2.3.15.1
> Reporter: Sergey Tychina
> Assignee: Bruce Phillips
> Fix For: 2.3.17
>
> Attachments: Component_Tag_Struts2_Mvn.zip
>
>
> Calling valueStack.findValue("parameter.ANY_STRING") in a component returns
> not-null value even if there were no parameters passed to the component.
> Example:
> {code:title=TestAction.java|borderStyle=solid}
> import com.opensymphony.xwork2.ActionSupport;
> import org.apache.struts2.interceptor.ServletRequestAware;
> import javax.servlet.http.HttpServletRequest;
> /**
> * @author Sergey Tychina
> */
> public class TestAction extends ActionSupport implements ServletRequestAware {
> private HttpServletRequest request;
> public String execute() {
> return SUCCESS;
> }
> @Override
> public void setServletRequest(HttpServletRequest request) {
> this.request = request;
> }
> }
> {code}
> {code:title=testaction.jsp (mapped for success result for the
> TestAction)|borderStyle=solid}
> <%@ taglib prefix="s" uri="/struts-tags" %>
> <s:component template="/testcomponent.jsp">
> <s:param name="testval" value="1"/>
> </s:component>
> {code}
> {code:title=testcomponent.jsp|borderStyle=solid}
> <%@ page import="com.opensymphony.xwork2.util.ValueStack" %>
> <%@ page import="org.apache.struts2.ServletActionContext" %>
> <%
> ValueStack valueStack = (ValueStack)
> request.getAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY);
> Object foundValue = valueStack.findValue("parameters.ANY_PARAM_NAME");
> %>
> <%=foundValue == null ? "NULL" : "NOT NULL"%>
> {code}
> This component will always print "NOT NULL" to the screen.
> Thanks,
> Sergey.
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