[LOG4J2-3564] NPE in JULLogger.getLevel()

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.17.2
• Fix Version/s: 2.19.0
• Component/s: Log4j-to-JUL
• Assignee: Unassigned
• Reporter: Piotr Karwasz
• Created: 28/Jul/22 20:15
• Updated: 23/Sep/22 04:08
• Resolved: 28/Jul/22 20:22

Description

JULLogger.getLevel() fails with a NullPointerException if the JUL root logger has a null level. This is a common situation in JDK 8+, since LogManager$RootLogger does not set the log level any more in its constructor.

A practical example where it fails is Tomcat's ClassLoaderLogManager: cf. BZ 66184.