Artifact com.google.code.findbugs:annotations:2.0.0 contains invalid header in it's MANIFEST.MF and OSGI runtime reports this problem:
276 INSTALLED findbugsAnnotations_2.0.0
osgi> diag 276
Missing Constraint: Bundle-RequiredExecutionEnvironment: JavaSE-1.5
Header Bundle-RequiredExecutionEnvironment should have J2SE-1.5 as it's value not JavaSE-1.5.
See http://wiki.osgi.org/wiki/Execution_Environment for valid values.
p.s. also please consider adding valid OSGI manifest to other findbugs artifacts (e.g. com.google.code.findbugs:jsr305).
p.p.s. findbugs 2.0.1 was released bug i still don't see it on maven central.