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Error on @Entity

 
Ranch Hand
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Hello,
I work with JPA in a site drive project, I encounter a problem with the @Entity annotation that gives me an error that I do not understand.

here is my source code:




Error on @Entity : The Java class for mapped type "Article" must define a non-private zero-argument constructor

I tried several syntax but I do not see where is the error!

How to do ?
 
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The error says it all, an entity class must have a no-argument constructor, add this:

 
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You can make it protected or package-private, it doesn't need to be public. It can't be private though.
 
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