netty: Illegal reflective access warnings when running Netty with Java 9
Expected behavior
No warnings.
Actual behavior
Warnings when starting netty with java 9:
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by io.netty.util.internal.ReflectionUtil (file:/home/doom369/.m2/repository/io/netty/netty-common/4.1.16.Final/netty-common-4.1.16.Final.jar) to constructor java.nio.DirectByteBuffer(long,int)
WARNING: Please consider reporting this to the maintainers of io.netty.util.internal.ReflectionUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
with --illegal-access=warn enabled :
WARNING: Illegal reflective access by io.netty.util.internal.ReflectionUtil (file:/home/doom369/.m2/repository/io/netty/netty-common/4.1.16.Final/netty-common-4.1.16.Final.jar) to constructor java.nio.DirectByteBuffer(long,int)
WARNING: Illegal reflective access by io.netty.util.internal.ReflectionUtil (file:/home/doom369/.m2/repository/io/netty/netty-common/4.1.16.Final/netty-common-4.1.16.Final.jar) to method java.nio.Bits.unaligned()
Steps to reproduce
Run any netty server with Java 9.
Netty version
4.1.16.Final
JVM version (e.g. java -version)
java version "9"
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)
Maybe it would be better to do not access above classes in case of java 9 to avoid warning?
About this issue
- Original URL
- State: closed
- Created 7 years ago
- Comments: 22 (14 by maintainers)
Commits related to this issue
- Reflective setAccessible(true) will produce scary warnings on the console when using java9+, dont do it Motivation: Reflective setAccessible(true) will produce scary warnings on the console when usi... — committed to netty/netty by normanmaurer 6 years ago
- Reflective setAccessible(true) will produce scary warnings on the console when using java9+, dont do it Motivation: Reflective setAccessible(true) will produce scary warnings on the console when usi... — committed to netty/netty by normanmaurer 6 years ago
- Reflective setAccessible(true) will produce scary warnings on the console when using java9+, dont do it Motivation: Reflective setAccessible(true) will produce scary warnings on the console when usi... — committed to netty/netty by normanmaurer 6 years ago
- Reflective setAccessible(true) will produce scary warnings on the console when using java9+, dont do it Motivation: Reflective setAccessible(true) will produce scary warnings on the console when usi... — committed to netty/netty by normanmaurer 6 years ago
- Reflective setAccessible(true) will produce scary warnings on the console when using java9+, dont do it Motivation: Reflective setAccessible(true) will produce scary warnings on the console when usi... — committed to kiril-me/netty by normanmaurer 6 years ago
- Update Netty jars to 4.1.24. Contributes to #2656. Eliminates warning messages about illegal reflective access. See also https://github.com/netty/netty/issues/7254 — committed to jython/frozen-mirror by jeff5 6 years ago
- Update Netty jars to 4.1.24. Contributes to #2656. Eliminates warning messages about illegal reflective access. See also https://github.com/netty/netty/issues/7254 — committed to jeff5/jython-nightjar by jeff5 6 years ago
- Update Netty jars to 4.1.24. Contributes to #2656. Eliminates warning messages about illegal reflective access. See also https://github.com/netty/netty/issues/7254 — committed to jeff5/jython-nightjar by jeff5 6 years ago
- Reflective setAccessible(true) will produce scary warnings on the console when using java9+, dont do it Motivation: Reflective setAccessible(true) will produce scary warnings on the console when usi... — committed to pulllock/netty by normanmaurer 6 years ago
Can we re-open this to actually solve the issue, I’d hate for things to break later on because this never got fixed?
The warning is quite clear this will break later on.
The error still occurs with netty 5.0.0.Alpha2. Please reopen the issue.
I think we could add a system property that tells netty to not even try to access this stuff when running on java9. Let me reopen
@johanneshiry You are seeing the warning because you have
-Dio.netty.tryReflectionSetAccessible=truewhich overrides the default, which isfalsefor Java 9 and above.@rockwotj Actually when reflection access will be removed from Java 9 - netty will be ready. As fixed was already applied.
Netty was tested on EA builds were reflective access was removed and right now netty handles this case. So you don’t need to worry here.