Gunnar Morling created FLINK-30478:
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Summary: Don't depend on IPAddressUtil
Key: FLINK-30478
URL: https://issues.apache.org/jira/browse/FLINK-30478
Project: Flink
Issue Type: Sub-task
Components: API / Core
Reporter: Gunnar Morling
The class \{{org.apache.flink.util.NetUtils}} uses the JDK-internal class
\{{sun.net.util.IPAddressUtil}}. On current JDKs (16+), this causes issues as
access to this class is prevented by default and would require an additional
\{{--add-opens}} clause. That's undesirable in particular in cases where we
don't control the JVM start-up arguments, e.g. when using Flink embedded into a
custom Java application.
I suggest to replace this logic using the
[IPAddress|https://github.com/seancfoley/IPAddress/] library (Apache License
v2), which implements everything we need without relying on internal classes. I
have a patch for that ready and will submit it for discussion.
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