olamy commented on PR #58:
URL:
https://github.com/apache/maven-build-cache-extension/pull/58#issuecomment-1589018110
> @olamy
>
> > maybe would be good to add a comment regarding usage of `*-MM`
implementations which need some extra setup with jdk17+
> > In top directory create a file `.mvn/jvm.config` with a line
`--add-opens java.base/sun.nio.ch=ALL-UNNAMED`
>
> Do you recall why you indicate some requirements on jdk17+ ? The tests
seem to run fine without this flag, so I'm not sure it's actually required. On
a side note, I just noticed the build is broken on jdk >= 20, not sure why...
but that seems completely unrelated to this issue.
it's not requirement on jdk17. I'm just saying with 1.0.1 using
`<hashAlgorithm>XXMM</hashAlgorithm>` and jdk 17 without this flag give me this
error:
```
Exception in thread "main" java.lang.IllegalAccessError: class
net.openhft.hashing.LongHashFunction (in unnamed module @0x3e3861d7) cannot
access class sun.nio.ch.DirectBuffer (in module java.base) because module
java.base does not export sun.nio.ch to unnamed module @0x3e3861d7
at
net.openhft.hashing.LongHashFunction.hashByteBuffer(LongHashFunction.java:536)
at
net.openhft.hashing.LongHashFunction.hashBytes(LongHashFunction.java:530)
at org.apache.maven.buildcache.hash.XX$Checksum.digest(XX.java:83)
at
org.apache.maven.buildcache.hash.HashChecksum.digest(HashChecksum.java:58)
```
```
olamy@pop-os:~/dev/sources/jetty/jetty.project$ mvn -v
Apache Maven 3.9.2 (c9616018c7a021c1c39be70fb2843d6f5f9b8a1c)
Maven home: /home/olamy/.sdkman/candidates/maven/current
Java version: 17.0.7, vendor: Eclipse Adoptium, runtime:
/home/olamy/.sdkman/candidates/java/17.0.7-tem
Default locale: en_AU, platform encoding: UTF-8
OS name: "linux", version: "6.2.6-76060206-generic", arch: "amd64", family:
"unix"
```
I'm using https://github.com/eclipse/jetty.project.git branch
`jetty-12.0.x-build-cache` just remove the last entry from `.mvn/jvm.config`
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