JSP throw NullPointException error in the line

Question

Today I found JSP throw NullPointException error in the following line

_el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory()

I found delete

jsp-api-2.1.jar

can fix the issue, but don't know why. Anyone knows the reason for this error.

I am using Tomcat 6.0.33

Related: How do I import the javax.servlet API in my Eclipse project? — BalusC
– BalusC, Commented Apr 13, 2013 at 17:25

Arjan Tijms · Accepted Answer · 2013-04-13 08:45:20Z

1

Web apps must not provide their own Java EE libraries; they will conflict with the server's versions. It can create a variety of errors like this.

edited Apr 13, 2013 at 8:45

Arjan Tijms

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answered Nov 10, 2011 at 8:22

Dave Newton

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2 Comments

user705414 Over a year ago

still don't understand why. it is very hard to associate this kind of error to the cause.

Dave Newton Over a year ago

@user705414 Yes, it can be--and the error thrown can vary. It's just one of those things you learn to check when you get an unexplainable error that looks related to the servlet or JSP APIs :)

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