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jsp include file problem  RSS feed

 
tushar panda
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i wrote a code to dynamically generate a page :



but got errors :













i have 1 big doubt , can jsp include action be used in a conditional statement .. because there where i got all errors .

looking forward for answer
 
Sebastian Janisch
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i have 1 big doubt , can jsp include action be used in a conditional statement .. because there where i got all errors .


The JSP standard action can take part in conditional statements, loops etc. The include directive however, cannot. So your approach is okay.
Try to reference the file using the path from the web application root (start the path with /).
 
Sagar Rohankar
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Look carefully, is it JSP tag is allowed inside scriptlet enclosed Java code ?
 
Sebastian Janisch
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Sagar Rohankar wrote:
Look carefully, is it JSP tag is allowed inside scriptlet enclosed Java code ?


Yes it is ... that's totally fine. You can mix HTML, Tags (as long as these are not SimpleTags), and scriptlets freely.
 
Bear Bibeault
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Sebastian Janisch wrote:Yes it is ... that's totally fine.

Hogwash. You can't embed JSP actions inside scriptlets.
 
David Newton
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Sebastian Janisch wrote:Yes it is ... that's totally fine. You can mix HTML, Tags (as long as these are not SimpleTags), and scriptlets freely.

No you can't:Not legal, the same thing for custom tags. Text between scriptlet tags must be Java.
 
Sebastian Janisch
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Sorry, I didn't see that the scriptlet is not closed. That's what I meant when I said it's okay to mix them.

tushar panda, your code should look like this..


However, it is bad practice to put Java in JSP. Try to avoid that.
 
tushar panda
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sorry for late reply .

yeah now got it right , i missed out the (click!=null) condition .

but why shall i need it when i know "click" will never be null , because either of the three values(tenth,twelth,engg) will be submitted . (i need a bit explanation here)

--TUSHAR
 
Sebastian Janisch
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The problem wasn't the null check but rather the problem that you did not close and reopen your scriptlet tags and hence your JSP standard action is embedded in a scriptlet which is illegal .
 
tushar panda
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Sebastian Janisch wrote:The problem wasn't the null check but rather the problem that you did not close and reopen your scriptlet tags and hence your JSP standard action is embedded in a scriptlet which is illegal .


No no , once again i remove the (check!=null) condition and closed the scriplet tags (which i didn't before) but it gave error ,
it means the condition is needed here , but again , why shall , the click is nebver going to be null .

please clarify me because if i remove the check!=null it gives error ..a bit confused and exicited ..
 
Bear Bibeault
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Please show the new code, with code tags. Making us guess what your code looks like is not going to get you far.
 
Sebastian Janisch
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The check for null is not mandatory and it should not raise any exceptions if you omit the check...

What exception is thrown ?
 
tushar panda
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Bear Bibeault wrote:Please show the new code, with code tags. Making us guess what your code looks like is not going to get you far.


here is the new one :



and the error :

org.apache.jasper.JasperException: An exception occurred processing JSP page /form-data/test.jsp at line 3

1: <HTML>
2: <% String click = request.getParameter("click"); %>
3: <% if(click.trim().equals("tenth")) { %>
4: <jsp:include page="data/tenth.jsp" />
5: <% } %>
6:


Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.NullPointerException
org.apache.jsp.form_002ddata.test_jsp._jspService(test_jsp.java:57)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.20 logs.
 
Sebastian Janisch
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Well, that means that 'click' is null.

Please put code between the code tags.
 
tushar panda
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and this give no error :

 
Sebastian Janisch
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Check my post above.
 
tushar panda
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Sebastian Janisch wrote:Well, that means that 'click' is null.

Please put code between the code tags.



oops you are right , the first time i run the code click=null ,, ,, sorry for asking a dumb question ..
 
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