Solving Circular Dependencies in CDI

If you are using CDI in your project and if you are using it in such a way that there are circular dependencies:

 @Singleton @AC  
 class A {  
   @Inject @DC D d;  
 }   

 @Singleton @DC  
 class D {  
   @Inject @AC A a;  
 }
   

You are likely to end up with issues like:

 org.jboss.weld.exceptions.DeploymentException: WELD-001443: Pseudo scoped bean has circular dependencies. Dependency path:  

You can go ahead and use the javax.inject.Provider to resolve these issues in such a way.

 
 @Singleton @AC  
 class A {  
   @Inject @DC D d;  
 }   

 @Singleton @DC  
 class D {  
   @Provider Provider<A> a;  
 }
   

 
Then you may get the instance of Class A within any method of D as follows: 

 A aInstance = a.get();  

This way you can solve circular dependency issues of such nature.

Data Structure - Interview Questions

Continuing on the quick revision of important questions for my Interviews. These are good puzzles or questions related to Data Structures. (All are in Java)

Reverse a Linked List
Circular Linked List
Dijkstra's Algorithm
Self-Balancing Tree

Enjoy!