  Phase engineering techniques are used to control the dynamics of
long-bosonic-Josephson-junction arrays built by linearly coupling Bose-Einstein
condensates. Just at the middle point of the underlying discrete energy band of
the system, unlocked-relative-phase states are shown to be stationary along
with the locked-relative-phase Bloch waves. In finite, experimentally-feasible
systems, such states find ranges of dynamical stability that depend on the
ratio of coupling to interaction energy. The same ratio determines different
decay regimes, which include the recurrence of staggered-soliton trains in the
condensates around Josephson loop currents at the junctions. These transient
solitons are also found in their stationary configurations, which provide
striped-density states by means of either dark-soliton or bright-soliton
trains. Additionally, the preparation of maximally out-of-phase (or splay)
states is demonstrated to evolve into an oscillation of the uniform density of
the condensates that keeps constant the total density of the system and robust
against noise at low coupling.
