I have experienced this issue with several code bases. Yes, it appears to be a bug in Java 7. But it may be years before it will be fixed. I fixed it in Log4j 2 as you can see in https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk/core/src/main/java/org/apache/logging/log4j/core/helpers/NetUtils.java.

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