In John 15:7-11 we see that Obedience and Fruitfulness are the evidence of our Love for Jesus and our receiving His love for us. Our love for Jesus is not a mystical, nor only an emotional manifestation; it’s intensely practical just as Jesus’ love manifested to us is immensely practical seen in His death upon the cross.
Furthermore the lack of joy can be traced to our not abiding in His love. Ah but our abiding in His love will bring the fullness of joy. Friend, there is nothing more miserable in this world than a Christian who is not abiding in God’s love as he will have too much of Christ to be happy in this world and too much of the world to be happy in Christ. He doesn’t love sin enough to enjoy its temporary pleasures, and does not love Christ enough to relish in His holiness.
The joy Jesus speaks of here is a far cry from how the world defines it in the pleasures of a life of ease. The joy He speaks of is to be found in the exhilaration of being right with God, and the conscious walking in His love and care.