Not working in 17 JDK

[AcumenDev]

Hello, when i use any unpack* metod ( example messageUnpacker.unpackInt()) i recive error

Unable to make private java.nio.DirectByteBuffer(long,int) accessible: module java.base does not "opens java.nio" to unnamed module @5c30a9b0

Probmlem in org.msgpack.core.buffer.DirectBufferAccess and what does he use java.nio.DirectByteBuffer which is closed

Fast decision by add this when you start the JVM : --add-opens java.base/java.nio=ALL-UNNAMED
but it's a crutch(

I use:

'org.msgpack:msgpack-core:0.9.0'

java -version
openjdk version "17" 2021-09-14
OpenJDK Runtime Environment (build 17+35-Ubuntu-120.04)
OpenJDK 64-Bit Server VM (build 17+35-Ubuntu-120.04, mixed mode, sharing)

full stack trace

2021-10-05 16:17:13.717  WARN 36305 --- [ntLoopGroup-3-1] io.netty.channel.DefaultChannelPipeline  : An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.

java.lang.ExceptionInInitializerError: null
	at org.msgpack.core.buffer.MessageBuffer.<init>(MessageBuffer.java:389) ~[msgpack-core-0.9.0.jar:0.9.0]
	at org.msgpack.core.buffer.MessageBuffer.newMessageBuffer(MessageBuffer.java:305) ~[msgpack-core-0.9.0.jar:0.9.0]
	at org.msgpack.core.buffer.MessageBuffer.wrap(MessageBuffer.java:275) ~[msgpack-core-0.9.0.jar:0.9.0]
	at org.msgpack.core.buffer.ByteBufferInput.next(ByteBufferInput.java:57) ~[msgpack-core-0.9.0.jar:0.9.0]
	at org.msgpack.core.MessageUnpacker.getNextBuffer(MessageUnpacker.java:273) ~[msgpack-core-0.9.0.jar:0.9.0]
	at org.msgpack.core.MessageUnpacker.nextBuffer(MessageUnpacker.java:285) ~[msgpack-core-0.9.0.jar:0.9.0]
	at org.msgpack.core.MessageUnpacker.readByte(MessageUnpacker.java:413) ~[msgpack-core-0.9.0.jar:0.9.0]
	at org.msgpack.core.MessageUnpacker.unpackInt(MessageUnpacker.java:939) ~[msgpack-core-0.9.0.jar:0.9.0]
	at com.acumendev.gribcontrol.protocol.msgpack.netty.MsgPackDecoder.findStartPacket(MsgPackDecoder.java:69) ~[main/:na]
	at com.acumendev.gribcontrol.protocol.msgpack.netty.MsgPackDecoder.decode(MsgPackDecoder.java:38) ~[main/:na]
	at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1372) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1235) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1284) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:280) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-all-4.1.68.Final.jar:4.1.68.Final]
	at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
Caused by: java.lang.RuntimeException: java.lang.reflect.InaccessibleObjectException: Unable to make private java.nio.DirectByteBuffer(long,int) accessible: module java.base does not "opens java.nio" to unnamed module @5c30a9b0
	at org.msgpack.core.buffer.DirectBufferAccess.<clinit>(DirectBufferAccess.java:111) ~[msgpack-core-0.9.0.jar:0.9.0]
	... 42 common frames omitted
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make private java.nio.DirectByteBuffer(long,int) accessible: module java.base does not "opens java.nio" to unnamed module @5c30a9b0
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354) ~[na:na]
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[na:na]
	at java.base/java.lang.reflect.Constructor.checkCanSetAccessible(Constructor.java:188) ~[na:na]
	at java.base/java.lang.reflect.Constructor.setAccessible(Constructor.java:181) ~[na:na]
	at org.msgpack.core.buffer.DirectBufferAccess.<clinit>(DirectBufferAccess.java:98) ~[msgpack-core-0.9.0.jar:0.9.0]
	... 42 common frames omitted

`

[xerial]

The cause is that creating a new DirectBuffer requires a different implementation for JDK17:

Caused by: java.lang.RuntimeException: java.lang.reflect.InaccessibleObjectException: Unable to make private java.nio.DirectByteBuffer(long,int) accessible: module java.base does not "opens java.nio" to unnamed module @1c3d5e76
	at org.msgpack.core.buffer.DirectBufferAccess.<clinit>(DirectBufferAccess.java:111)
	... 10 more

[xerial]

To use DirectByteBuffer in JDK17, two JVM options must be set:

--add-opens=java.base/java.nio=ALL-UNNAMED
--add-opens=java.base/sun.nio.ch=ALL-UNNAMED

If DirectByteBuffer is not used, msgpack-java 0.9.3 will work even if these two options are not set.