Spring boot JSP error: NoClassDefFoundError

Question

Everytime I try to run spring boot app configured with JSP I get this error:

java.lang.NoClassDefFoundError: javax/servlet/ServletContext
    at java.lang.Class.         


        

Answer 1

There's a bug in IntelliJ that means that provided dependencies aren't added to the classpath. Assuming you want to stick with IDEA, you have a few options:

• Manually configure the classpath in IDEA
• Run the samples on the command line using mvn spring-boot:run
• Remove all occurrences of provided from the pom. This will mean that app can't be deployed as a war to Tomcat or similar

EDIT: The bug is fixed and the server will start normally, as long as you tick the Include dependencies with "Provided" scope checkbox in the run configuration, below classpath.