  We use the light front ``machinery'' to study the behavior of a relativistic
free particle and obtain the quantum commutation relations from the classical
Poisson brackets. We argue that their usual projection onto the light-front
coordinates from the covariant commutation relations show that there is an
inconsistency in the expected correlation between canonically conjugate
variables ``time'' and ``energy''. Moreover we show that this incompatibility
originates from the very definition of the Poisson brackets that is employed
and present a simple remedy to this problem and envisages a profound physical
implication on the whole process of quantization.
