Error testing in JSP
This section illustrates you about the error testing in jsp.
In JSP, you can specify the error page to be invoked when any error or exception is encountered. Exception and error can be handled by using two page directives <%@ page errorPage="errorPage.jsp" %> and <%@ page isErrorPage="true" %>. The JSP page where the exception can occur specifies the error page name to be invoked and the error page also needs to specify its status whether it is error page. To test the error, you have to invoke the exception through statements. Here is an example which shows an error testing.
Here is the code of errorTesting.jsp
| <%@ page errorPage="errorPage.jsp" %> <html> <head><title>Error testing Example </title> </head> <body> <%! String text = null; %> The length of the text is <%= text.length() %> </body> </html> |
Here is the code of errorPage.jsp
| <%@ page isErrorPage="true" %> <html><HEAD><TITLE>Error testingExample </TITLE> </HEAD><body> <h2>Exception:</h2> <%= exception %> has been encountered! </body></html> |
In the above example, we are invoking an exception by setting a variable text of string type to null. <%=text.length()%> invokes an exception that would be shown on the "errorPage.jsp" .
Here is the output
