/usr/bin/jlint.sh is in jlint 3.0-4.4ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/bash
find . -name '*.class' | xargs jlint -not_overridden \
-redundant -weak_cmp -bounds -zero_operand -string_cmp -shadow_local | \
grep -v 'Field .class\$' | grep -v 'can be .*ed from different threads' | \
grep -v 'Method.*Runnable.*synch'
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