Summary: detect_application.h|detect_application.cc: add support for java.

Test Plan: Existing tests.

Reviewers: #stirling, oazizi

Reviewed By: #stirling, oazizi

JIRA Issues: PP-2982
Signed-off-by: Pete Stevenson <jps@pixielabs.ai>

Differential Revision: https://phab.corp.pixielabs.ai/D9902

GitOrigin-RevId: babdb2497f6776e75d11ef70b96ab4124ce5aeb6