  Jets produced in the pseudo-rapidity range, $-1.0 < \eta < 1.0$, from $pp$
collisions at RHIC kinematics are dominated by quark-gluon and gluon-gluon
scattering processes. Therefore the longitudinal double spin asymmetry $A_{LL}$
for jets is an effective channel to explore the longitudinal gluon polarization
in the proton. At STAR, jets are reconstructed in full azimuth, from the
charged-particle tracks seen by the Time Projection Chamber and
electro-magnetic energy deposited in the Barrel and Endcap electro-magnetic
calorimeters at both $\sqrt{s} = $ 200 and 510 GeV. Early STAR inclusive jet
$A_{LL}$ results at $\sqrt{s} = $ 200 GeV provided the first evidence of the
non-zero gluon polarization at $x > $ 0.05. At $\sqrt{s} = $ 510 GeV, the
inclusive jet $A_{LL}$ is sensitive to the gluon polarization as low as $x \sim
$ 0.015. In this talk, we will discuss recent STAR inclusive jet and dijet
$A_{LL}$ results at $\sqrt{s} = $ 510 GeV and highlight the new techniques
designed for this analysis, for example the underlying event correction to the
jet transverse energy and its effect on the jet $A_{LL}$. Dijet $A_{LL}$
results are shown for four topologies in regions of pseudo-rapidity,
effectively scanning the $x$-dependence of the gluon polarization.
