In this contribution we analyze particle like soliton solutions of the two important models of classical nonlinear field theory the so named: j4 -and j6- model. These solutions are studied considering the trivial and condensate type of boundary conditions, that means the field is zero or is equal to a constant value at infinity. The phase trajectories of solitons are studied for both models. By using the virial theorem and considering the mechanical analogy of the nonlinear dynamics, upon the boundary condition of two types, we acquired some fundamental characteristics of these models
