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Web Component Certification (OCEJWCD)

Doubt on HFSJ Final Mock Exam #22

Greenhorn

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posted 18 years ago

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Hi,
Here is the question for Q22 of the final Mock Exam:

Given that /segment/footer.html is a static page, which JSP code would you use to include static content in a JSP?

A. <%@ include file="/segment/footer.html" %>
B. <jsp:forward page="/segment/footer.html" />
C. <jsp:include page="/segment/footer.html"/>
D. RequestDispatcher dispatcher=request.getRequestDispatcher("/segments/footer.html");
dispatcher.include(request,response);

The answers given are A and C. I understand why A and C are right. But my question is why D is not right? I want to know the exact reason. Is it because they should be inside <% %>? Or because HTML files can not be the argument of getRequestDispatcher()? (I tried it and it didn't work, but I don't understand because the document says it can include html files, jsp files and Servlets.) Thank you.

SCJP 1.4<br />SCWCD 1.4

Chandra Sagi

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posted 18 years ago

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Is it because they should be inside <% %>

Yes. That could be the only reason.

Thanks
Chandu

Xiaoxiao Lam

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posted 18 years ago

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Thank you, Chandu. I supposed it would work if we put the code inside <% %>, but when I tried it using the exact code as choice D, it didn't work. I changed the file "footer.html" to "footer.jsp", it worked. Do you know why? Thank you.

SCJP 1.4<br />SCWCD 1.4

Chandra Sagi

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posted 18 years ago

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Originally posted by Xiaoxiao Lam:
but when I tried it using the exact code as choice D, it didn't work. I changed the file "footer.html" to "footer.jsp", it worked.

Thats interesting, might be .html is considered static page and cannot be used using RequestDispatcher. Please confirm whether you have a .html page or .jsp in the correct location. If its working only with .jsp extension then I guess using RequestDispatcher we cannot include or forward to a static page. I would like to know the result too.

Thanks
Chandu

Chandra Sagi

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posted 18 years ago

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I am wrong. API says

include(ServletRequest request, ServletResponse response)
Includes the content of a resource (servlet, JSP page, HTML file) in the response.

it includes the contect of a HTML file too. So make sure you have a .html file

Thanks
Chandu

Xiaoxiao Lam

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posted 18 years ago

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I am wrong. API says

it includes the contect of a HTML file too. So make sure you have a .html file

Yes, I had html file there when I used html file path and it didn't work. When I changed the html file to be a jsp file and used jsp file path, it worked.

Error Message when I used html file:

exception

org.apache.jasper.JasperException: getOutputStream() has already been called for this response
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802
[ March 14, 2006: Message edited by: Xiaoxiao Lam ]

SCJP 1.4<br />SCWCD 1.4

Chandra Sagi

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posted 18 years ago

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Try these two options

1) strip the <html> and <body> tags incase you have some in your html file

2) See whether it works for dispatcher.forward(...)

I don't think you flushed the buffer or written anything to the response before dispatching it.

Thanks
Chandu

Xiaoxiao Lam

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posted 18 years ago

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I didn't put any other content including "<html><body>" tags in the html file at all. Both include and forward method didn't work. And once I changed the file extension to be .jsp, both of the methods work.

SCJP 1.4<br />SCWCD 1.4

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