Constantin Hirsch created LOG4J2-2939:
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Summary: NPE in MDCContextMap
Key: LOG4J2-2939
URL: https://issues.apache.org/jira/browse/LOG4J2-2939
Project: Log4j 2
Issue Type: Bug
Components: SLF4J Bridge
Affects Versions: 2.13.3
Environment: Empty fresh Spring Boot project on Windows 10 64Bit
Oracle JDK11
Reporter: Constantin Hirsch
When using the SLF4J adapter and you call ThreadContext.containsKey() before
putting anything into the ThreadContext, a NullPointerException is thrown:
{{ }}{{Exception in thread "main" +java.lang.NullPointerException+}}{{ at
org.apache.logging.slf4j.MDCContextMap.containsKey(+MDCContextMap.java:74+)}}{{
at
org.apache.logging.log4j.ThreadContext.containsKey(+ThreadContext.java:350+)}}{{
at
de.semvox.logtest.LogtestApplication.main(+LogtestApplication.java:15+)}}
This is not surprising, as the implementation looks like this
{{@Override}}
{{*public* *boolean* containsKey(*final* String key) {}}
{{ *return* MDC._getCopyOfContextMap_().containsKey(key);}}{{ }}}
And the Javadoc for getCopyOfContextMap explicitly states “May be null.”
This bug is also present in the isEmpty method of the same class.
Workaround: Before any tests are made, e.g. top of main, execute the following
{{ThreadContext.put(“foo”,”bar”);}}
{{ThreadContext.remove(“foo”);}}
I will create a pull request shortly.
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