GeezerVison is showing github.com — Illegal reflective access by org.msgpack.core.buffer.DirectBufferAccess · Issue #605 · msgpack/msgpack-java
Illegal reflective access by org.msgpack.core.buffer.DirectBufferAccess #605
Description
When I run my program, I get a warning message with the title. The message also said "Please consider reporting this to the maintainers of org.msgpack.core.buffer.DirectBufferAccess", so I will report it here.
A simple reproduction program (named ReproduceCase.java) is below.
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.msgpack.core.MessagePack;
import org.msgpack.core.MessagePacker;
import org.msgpack.core.MessageUnpacker;
import org.msgpack.core.buffer.ByteBufferInput;
public final class ReproduceCase {
class ByteBufferBackedInput extends ByteBufferInput {
ByteBufferBackedInput(ByteBuffer byteBuffer) {
super(byteBuffer);
}
}
ReproduceCase() {
}
ByteBufferInput encode() throws IOException {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
MessagePacker packer = org.msgpack.core.MessagePack.newDefaultPacker(outputStream);
packer.packLong((long) 123456789);
packer.flush();
byte[] ba = outputStream.toByteArray();
var length = ba.length;
var directByteBuffer = ByteBuffer.allocateDirect(length);
directByteBuffer.put(ba, 0, length);
directByteBuffer.rewind();
return new ByteBufferBackedInput(directByteBuffer);
}
void decode(ByteBufferInput buffer) throws IOException {
var unpacker = org.msgpack.core.MessagePack.newDefaultUnpacker(buffer);
System.out.println(unpacker.unpackLong());
}
public static void main(String[] args) {
try {
var reproduce = new ReproduceCase();
var buffer = reproduce.encode();
reproduce.decode(buffer);
} catch (IOException e) {
System.out.println(e);
}
}
}
The warning message is output when the following line is executed.
var unpacker = org.msgpack.core.MessagePack.newDefaultUnpacker(buffer);
The following is supplementary information.
- This happens with both msgpack-core-0.8.24 and 0.9.0.
- unpacker.unpackLong() works fine, as you can see when you run the program.
- If you used ByteBuffer.allocate(length) instead of ByteBuffer.allocateDirect(length), you will not get that warning. However, that is not a solution for me because my program needs to use direct byte buffer.
Activity
xerial commented on Jun 28, 2022
I think this is a JDK17-specific issue, which will be fixed in #660.
Adding two JVM options would be necessary:
--add-opens=java.base/java.nio=ALL-UNNAMED
--add-opens=java.base/sun.nio.ch=ALL-UNNAMED
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