Maybe need to add more detailed metadata for io.netty:netty-*

[linghengqian]

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• I'm not sure if Add Netty 4.1 metadata #10 is missing some metadata about Netty.

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• When I'm using GraalVM 23.0 CE Dev For JDK17 and NBT 0.9.16 to build a GraalVM Native Image related to Netty 4.1.84.Final, https://github.com/apache/shardingsphere/actions/runs/3303870293/jobs/5452309095 's logs have been seen some Netty related logs, I'm not sure if that means I need to add some extra GraalVM reachability metadata.

Warning: Properties file at 'jar:file:///home/runner/.m2/repository/io/netty/netty-codec-http2/4.1.84.Final/netty-codec-http2-4.1.84.Final.jar!/META-INF/native-image/io.netty/codec-http2/native-image.properties' does not match the recommended 'META-INF/native-image/io.netty/netty-codec-http2/native-image.properties' layout.
Warning:  Properties file at 'jar:file:///home/runner/.m2/repository/io/netty/netty-resolver-dns/4.1.84.Final/netty-resolver-dns-4.1.84.Final.jar!/META-INF/native-image/io.netty/resolver-dns/native-image.properties' does not match the recommended 'META-INF/native-image/io.netty/netty-resolver-dns/native-image.properties' layout.
Warning:  Properties file at 'jar:file:///home/runner/.m2/repository/io/netty/netty-transport/4.1.84.Final/netty-transport-4.1.84.Final.jar!/META-INF/native-image/io.netty/transport/native-image.properties' does not match the recommended 'META-INF/native-image/io.netty/netty-transport/native-image.properties' layout.
Warning: Properties file at 'jar:file:///home/runner/.m2/repository/io/netty/netty-common/4.1.84.Final/netty-common-4.1.84.Final.jar!/META-INF/native-image/io.netty/common/native-image.properties' does not match the recommended 'META-INF/native-image/io.netty/netty-common/native-image.properties' layout.
Warning:  Properties file at 'jar:file:///home/runner/.m2/repository/io/netty/netty-codec/4.1.84.Final/netty-codec-4.1.84.Final.jar!/META-INF/native-image/codec-handlers/native-image.properties' does not match the recommended 'META-INF/native-image/io.netty/netty-codec/native-image.properties' layout.
Warning:  Properties file at 'jar:file:///home/runner/.m2/repository/io/netty/netty-handler/4.1.84.Final/netty-handler-4.1.84.Final.jar!/META-INF/native-image/io.netty/handler/native-image.properties' does not match the recommended 'META-INF/native-image/io.netty/netty-handler/native-image.properties' layout.
Warning:  Properties file at 'jar:file:///home/runner/.m2/repository/io/netty/netty-codec-http/4.1.84.Final/netty-codec-http-4.1.84.Final.jar!/META-INF/native-image/io.netty/codec-http/native-image.properties' does not match the recommended 'META-INF/native-image/io.netty/netty-codec-http/native-image.properties' layout.
Warning:  Properties file at 'jar:file:///home/runner/.m2/repository/io/netty/netty-buffer/4.1.84.Final/netty-buffer-4.1.84.Final.jar!/META-INF/native-image/io.netty/buffer/native-image.properties' does not match the recommended 'META-INF/native-image/io.netty/netty-buffer/native-image.properties' layout.
Warning: Could not register io.netty.handler.codec.compression.Lz4FrameDecoder: queryAllPublicMethods for reflection. Reason: java.lang.NoClassDefFoundError: net/jpountz/lz4/LZ4Exception.
Warning: Could not register io.netty.handler.codec.compression.Lz4FrameEncoder: queryAllPublicMethods for reflection. Reason: java.lang.NoClassDefFoundError: net/jpountz/lz4/LZ4Exception.
Warning: Could not register io.netty.handler.codec.marshalling.CompatibleMarshallingDecoder: queryAllPublicMethods for reflection. Reason: java.lang.NoClassDefFoundError: org/jboss/marshalling/ByteInput.
Warning: Could not register io.netty.handler.codec.marshalling.CompatibleMarshallingEncoder: queryAllPublicMethods for reflection. Reason: java.lang.NoClassDefFoundError: org/jboss/marshalling/ByteOutput.
Warning: Could not register io.netty.handler.codec.marshalling.MarshallingDecoder: queryAllPublicMethods for reflection. Reason: java.lang.NoClassDefFoundError: org/jboss/marshalling/ByteInput.
Warning: Could not register io.netty.handler.codec.marshalling.MarshallingEncoder: queryAllPublicMethods for reflection. Reason: java.lang.NoClassDefFoundError: org/jboss/marshalling/ByteOutput.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

• I noticed https://github.com/oracle/graalvm-reachability-metadata/tree/master/metadata%2Fio.netty%2Fnetty-handler and https://github.com/oracle/graalvm-reachability-metadata/tree/master/metadata%2Fio.netty%2Fnetty-codec-http2 , such metadata is actually empty. Should this mean waiting for more metadata to be added?

Additional context
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• Some early context is at Make ShardingSphere Proxy in GraalVM Native Image form available apache/shardingsphere#21347 (comment) .

[sdeleuze]

I think the empty metadata are ok because those entries are just here to specify the exclude flag on metadata side and should not translate to concrete native-image.properties visible by the native image compiler. Maybe the builtin Netty files in https://github.com/netty/netty should be moved to proper io.netty/netty-* directories to not print those warnings.

Also native-image should not print those warnings on excluded dependencies.

@gradinac Any thoughts?

[gradinac]

I think you are right, we should create the recommended metadata directory structure in Netty and move the metadata there, I'll create a Netty PR for that

[linghengqian]

• Looks like nothing needs to be done in this repository, I will close this issue.