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https://issues.apache.org/jira/browse/LOG4J2-1359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16000740#comment-16000740
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Ralph Goers commented on LOG4J2-1359:
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Please see the instructions in src/site/markdown/build.md and in BUILDING.md.
master requires both Java 9 and Java 7 to build.
> Add support for Java 9 StackWalker API in ReflectionUtil
> --------------------------------------------------------
>
> Key: LOG4J2-1359
> URL: https://issues.apache.org/jira/browse/LOG4J2-1359
> Project: Log4j 2
> Issue Type: Improvement
> Components: API
> Environment: Java 1.9+
> Reporter: Matt Sicker
> Assignee: Ralph Goers
> Labels: jdk9
>
> [StackWalker|http://download.java.net/jdk9/docs/api/java/lang/StackWalker.html]
> Based on the functional nature of this API, supporting it may require
> compiling at least one class using javac 1.9 and reflectively loading it in
> ReflectionUtil similar to how Spring supports newer JDK APIs.
> Without support for StackWalker, ReflectionUtil will fall back to using a
> slower API in Java 1.9. This is because the Reflection class is a
> sun-internal class which are no longer exported to non-JDK code without
> setting special command line flags.
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