Generate Error in JSP
In software engineering, the term refers to an
incorrect action or calculation performed by software. In general we can say
that the error results from a combination of a defect and a fault. If, as a
result of the error, the system performs an undesired actions or fails to
perform a desired action, then this is referred as a failure.
An error may be detected by the software which can be
handled by raising an exception. eg. 404 or Not found error message is an Http
standard response code indicating that the server either could not find what was
requested. These errors messages are generated by the browsers. In HTTP error
500, the web server encountered an unexpected condition that prevented it from fulfilling
the request by the client. There are many more Http errors codes available. They
are not discussed in this example.
The code of the program is given below:
<HTML>
<HEAD><TITLE>Generate Error in jsp</TITLE></HEAD>
<BODY>
This page generates an error when you click the button.<P>
<FORM METHOD="POST" ACTION="ErrorPagr.jsp">
<INPUT TYPE="HIDDEN" NAME="errorValue" VALUE="error">
<INPUT TYPE="SUBMIT" VALUE="Generate exception!">
</FORM>
</BODY>
</HTML>
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<%
String hiddenvalue = request.getParameter("errorValue");
if ( hiddenvalue.equals("error"))
throw new java.lang.NullPointerException();
%>
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Output of the Program:
Download this example.
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