> On 11 Jun 2019, at 10:04, Tommy Stendahl <tommy.stend...@ericsson.com> wrote:
>
> Hi,
>
> I can't find a way to build 4.0 artifacts so I can run Cassandra using Java8.
> Building the artifacts ("ant artifacts" or "ant mvn-install") requires
> building with Java11 but since CASSANDRA-15108 the result is not Java8
> compatible anymore, is this intentional or was this done by mistake?
This was unintentional, it looks like we just missed removing the
“unless=java.version.8” from the artifacts & _artifacts-init targets in
build.xml.
I’ve tested that with those removed, it’s just a matter of having the
appropriate target jdk specified in $JAVA_HOME (and using -Duse.jdk11=true or
$CASSANDRA_USE_JDK11=true if building with jdk11).
We’ll fix this in trunk, but in the meantime removing those conditions should
unblock you.
Thanks,
Sam
>
> I also tried to change this back and force Java11 to build Java8 compatible
> code but it seams that there are some changes in the ByetBuffer
> implementation in Java11 that breaks when execution in a Java8 jvm, when I
> started Cassandra it throws a NoSuchMethodError when trying to open the
> sstables.
>
> 2019-05-28T16:20:24.506+0200 [SSTableBatchOpen:4] ERROR
> o.a.c.i.s.format.SSTableReader$2:576 run Corrupt sstable
> /var/lib/cassandra/data/system/sstable_activity-5a1ff267ace03f128563cfae6103c65e/mc-2202-big=[CompressionInfo.db,
> TOC.txt, Statistics.db, Summary.db, Index.db, Data.db, Filter.db,
> Digest.crc32]; skipping table
> org.apache.cassandra.io.sstable.CorruptSSTableException: Corrupted:
> /var/lib/cassandra/data/system/sstable_activity-5a1ff267ace03f128563cfae6103c65e/mc-2202-big-Statistics.db
> at
> org.apache.cassandra.io.sstable.format.SSTableReader.open(SSTableReader.java:504)
> at
> org.apache.cassandra.io.sstable.format.SSTableReader.open(SSTableReader.java:375)
> at
> org.apache.cassandra.io.sstable.format.SSTableReader$2.run(SSTableReader.java:571)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.NoSuchMethodError:
> java.nio.ByteBuffer.position(I)Ljava/nio/ByteBuffer;
> at
> org.apache.cassandra.utils.memory.BufferPool.allocateDirectAligned(BufferPool.java:528)
> at
> org.apache.cassandra.utils.memory.BufferPool.access$600(BufferPool.java:46)
> at
> org.apache.cassandra.utils.memory.BufferPool$GlobalPool.allocateMoreChunks(BufferPool.java:279)
> at
> org.apache.cassandra.utils.memory.BufferPool$GlobalPool.get(BufferPool.java:248)
> at
> org.apache.cassandra.utils.memory.BufferPool$LocalPool.addChunkFromGlobalPool(BufferPool.java:354)
> at
> org.apache.cassandra.utils.memory.BufferPool$LocalPool.get(BufferPool.java:397)
> at
> org.apache.cassandra.utils.memory.BufferPool.maybeTakeFromPool(BufferPool.java:143)
> at
> org.apache.cassandra.utils.memory.BufferPool.takeFromPool(BufferPool.java:115)
> at org.apache.cassandra.utils.memory.BufferPool.get(BufferPool.java:94)
> at
> org.apache.cassandra.io.util.BufferManagingRebufferer.<init>(BufferManagingRebufferer.java:45)
> at
> org.apache.cassandra.io.util.BufferManagingRebufferer$Unaligned.<init>(BufferManagingRebufferer.java:117)
> at
> org.apache.cassandra.io.util.SimpleChunkReader.instantiateRebufferer(SimpleChunkReader.java:60)
> at
> org.apache.cassandra.io.util.RandomAccessReader.open(RandomAccessReader.java:319)
> at
> org.apache.cassandra.io.sstable.metadata.MetadataSerializer.deserialize(MetadataSerializer.java:126)
> at
> org.apache.cassandra.io.sstable.format.SSTableReader.open(SSTableReader.java:500)
> ... 8 common frames omitted
>
> The reason for this is that some methods in the ByteBuffer implementation in
> Java11 returns a Bytebuffer but in Java8 and before they returned a Buffer. I
> found a bit of information on Stackoverflow
> (https://stackoverflow.com/questions/48693695/java-nio-buffer-not-loading-clear-method-on-runtime)
> so there seams to be a way to fix this even if the resulting code looks ugly
> to me.
>
> My question is, are we intentionally giving up Java8 comparability in 4.0 or
> do we still want to support Java8?
>
> Regards,
> Tommy
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