0

I'm trying to build a JSF application, but I'm having this error: 

java.lang.ClassNotFoundException: javax.servlet.descriptor.JspConfigDescriptor
java.lang.NoClassDefFoundError: javax/servlet/descriptor/JspConfigDescriptor

How is this caused and how can I solve it?

BalusC
  • 1,082,665
  • 372
  • 3,610
  • 3,555
user2739754
  • 1
  • 1
  • 1
  • When does this Exception occur? Which container do you use? How does your facelets code look like? – noone Sep 03 '13 at 09:32

1 Answers1

1

java.lang.ClassNotFoundException: javax.servlet.descriptor.JspConfigDescriptor

This class was introduced in Servlet 3.0. This error thus means that your webapp's runtime classpath is littered with arbitrarily downloaded JAR files from a completely different servletcontainer make/version which doesn't support Servlet 3.0, while the webapp is in turn deployed to a Servlet 3.0 compatible container. This would only result in classloading conflicts in all colors because multiple different versioned classes exist in the runtime classpath.

Littering /WEB-INF/lib folder with servletcontainer-specific JAR files is in turn a common starter's mistake in a wild attempt to "fix" compile errors they faced in their IDE. This should have been solved differently. See also How do I import the javax.servlet API in my Eclipse project?

In a nutshell: Never put arbitrarily downloaded servletcontainer-specific JARs in /WEB-INF/lib. Instead, configure your IDE project to set the desired target servletcontainer as "Target Runtime".

Community
  • 1
  • 1
BalusC
  • 1,082,665
  • 372
  • 3,610
  • 3,555