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Error in Java Import statement “The import javax.validation.constraints.NotNull cannot be resolved”

Iam new to Java and Spring Framework. After developing Spring roo project, I found following errors in class :

The import javax.validation.constraints.NotNull cannot be resolved

NotNull cannot be resolved to a type

Iam using STS 3.1.0.RELEASE

Can some one guide me what Iam doing and how it can be rectified.

Thanks in advance

Answer

The jar containing this class must be added to the build path of your project: http://mvnrepository.com/artifact/javax.validation/validation-api/1.0.0.GA