javax.validation.ValidationException: Unable to find default provider

Question

I am currently working on Spring MVC web app and trying to hook up validation using the @Valid annotation. When I fire up the application I\'m getting the following exceptio

Answer 1

See this answer : https://stackoverflow.com/a/3989936/325742

To fix, Add this maven dependency Hibernate Validator Annotation Processor.

  org.hibernate
  hibernate-validator-annotation-processor
  4.1.0.Final

That's the latest stable version of that artifact, as seen from here

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Generic way of finding a dependency

Let's say that you got a a NoClassDefFoundError stating that the class org.postgresql.Driver was not found.

1. Use Jarvana to search for a dependency that can provide org.postgresql.Driver like so : http://www.jarvana.com/jarvana/search?search_type=class&java_class=org.postgresql.Driver which gives

2. Translate the above dependency into maven dependency format :

   
       postgresql
      postgresql
      9.1-901.jdbc4
    
   

3. Confirm that the above is available at Maven Central by searching like this :
   g:"postgresql" AND a:"postgresql"
   (where g stands for GroupID and a stands for artifactID)

4. Finally, add it to your pom.xml

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Finding Dependencies using m2e

If you have an approximate idea of the dependency needed or can figure out the one you need given a list, then m2e's dependency search can be the quickest way of adding a dependency to your pom.xml

Steps :

1. Click on the Dependencies tab (A) in your pom.xml
2. Click on Add (B)
3. Search for the dependency by groupId/artifactId (C)
4. Double click the required one from the search results to have it added directly to your pom.xml (D)

A-D marked in the following snapshot :

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Finding dependencies in IntelliJ Idea

In IntelliJ, looking up a dependency is much easier. All you need to do, is to make sure that the maven central repo has been indexed by IntelliJ like so:

And then, go into the pom, do a dep+Tab (or an Alt+Insert as shown here), and this is what you get:

If you are in a class which has an unresolved import, then the quick fix gives you an option of searching and adding the corresponding maven repo by doing an Alt+Enter on the missing Class/Package:

Awesome I say !

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