The following exception happens when sending a NioMessage with a read-only ByteBuffer:

java.nio.ReadOnlyBufferException
    at java.base/java.nio.ByteBuffer.array(ByteBuffer.java:1507)
    at org.jgroups.NioMessage.writePayload(NioMessage.java:203)
    at org.jgroups.BaseMessage.writeTo(BaseMessage.java:277)
    at org.jgroups.util.Util.writeMessage(Util.java:1427)

To reproduce:

new NioMessage(null, ByteBuffer.allocate(1).asReadOnlyBuffer())
                .writePayload(new ByteArrayDataOutputStream());