How to customize crystal_servlet_uri?

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JSP

CrystalReports

I am having a problem with Crystal Report in JSP.
The report is viewed 1st page successfully, but I could not be viewed the next page, or export.
I've used a tool to catch the error. I realize that the error cause by invalid request.
For example my project url: http://localhost:8080/myproject, but when we navigate to next page or export report, it request to http://localhost:8080/CrystalReportViewerHandler.
It should be http://localhost:8080/myproject/CrystalReportViewerHandler.

What I have tried is put crystal_servlet_uri in web.xml:

<context-param>
	<param-name>crystal_servlet_uri</param-name>
	<param-value>/myproject/CrystalReportViewerHandler</param-value>
</context-param>

However, the request is not change (still http://localhost:8080/CrystalReportViewerHandler).
Does any one know another solution for this problem?
Thanks!