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Web Component Certification (OCEJWCD)

Confused regarding isErrorPage

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posted 14 years ago

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Guys,

I read page directive specification and it says:

isErrorPage="true | false"
Whether the JSP file displays an error page. If set to true, you can use the exception object in the JSP file. If set to false (the default value), you cannot use the exception object in the JSP file.

However I prepared error page without isErrorPage directive and I still can use exception object in it.
I tried both ways of configuring it as error page (in DD and using errorPage page directive in 'faulty' jsp). I also tried setting isErrorPage implicitly to "false".
It still works!

Is it a matter of Container? I use Tomcat 6.0

Regards,
Radek Sztando

Ankit Garg

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posted 14 years ago

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I prepared error page without isErrorPage directive and I still can use exception object in it.

How did you use the exception object basically?? I saw the source code of one of the servlet file generated by tomcat 6 for a JSP page, and the exception object was not created by tomcat in the .java file...

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Radoslaw Sztando

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posted 14 years ago

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I used EL:

Regards,
Radek Sztando

Chinmaya Chowdary

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Hi, Radoslaw.

Here exception object is accessing through EL implicit 'pageContext' Object. PageContext has getException() method. It is possible to access exception object through EL syntatx like,

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raj malhotra

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posted 14 years ago

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Hi
I also verified that if i remove isErrorPage="true" from the error page and i use jsp expression

to access the exception object i am getting jsp compilation error.

But i can use

to access the exception object.

This looks confusing .

Christophe Verré

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posted 14 years ago

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This looks confusing .

Not really. If isErrorPage="true" is not set, the implicit "exception" variable is not set by the container. You'll have an error if you try to access it. ${pageContext.exception} or <%=pageContext.getException()%> is calling the getException() method of the PageContext class. It's just like calling any kind of method.

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