Monday, March 23, 2015

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.

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