findbugs: byte[].toString -> Arrays.toString(byte[])(cherry picked from commit 23a3d99fc0836839a88584d7aa6a978d99c5d126)

Signed-off-by: Daan Hoogland <dhoogland@schubergphilis.com>
findbugs: removed fields injected in parent(cherry picked from commit 866a539b067663b346bd8d087c578987a86fe834)

Signed-off-by: Daan Hoogland <dhoogland@schubergphilis.com>
Findbugs: different issues solved(cherry picked from commit
0b13f8e59db1e681e1dff0baa828bb0711842e9f)
findbugs: assign result of string manipulations(cherry picked from
commit 20127e09dc0e341a2f790a8a52cded4c5f1f0cc1)
findbugs: nullpointer guards and wrappertype comparisons(cherry picked
from commit 791b7f8f7fe8f7d342e46fbb61a3f421e87fca59)