UnitOfWork Filter for Ninja - allows lightweight JPA usage ins resource-local mode. Annotate your classes / methods with @FilterWith(DatabaseAccess.class) to use JPA without explicit transactions.

gistfile1.txt

public class DatabaseAccess implements Filter {
    
    @Inject
    private UnitOfWork unitOfWork;

    @Override
    public Result filter(FilterChain filterChain, Context context) {
        
        Result result;
                
        try {
            
            unitOfWork.begin();
          
            result = filterChain.next(context);
            
        } finally {
            
            unitOfWork.end();
            
        }
        
        return result;
     }
 
}