William Ferguson created LOG4J2-2041:
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Summary: 2.9.0 contains classes built to class version 53
Key: LOG4J2-2041
URL: https://issues.apache.org/jira/browse/LOG4J2-2041
Project: Log4j 2
Issue Type: Bug
Affects Versions: 2.9.0
Reporter: William Ferguson
2.9.0 is built to class version 53, presumably because it includes attempts at
support for JDK9.
But JDK has not been released yet, so build tools that introspect class files
(such as Proguard) do not yet support consuming version 53 classes.
Can I suggest that an appropriate forward path is to build using and against
JDK9 but to build to class version 52 until some time after JDK9 has been
released so as to not break existing tooling.
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