Help about the error

What is the reason for this error in the openfire log?

2024.06.08 16:35:19.209 ERROR [TaskEngine-pool-7]: org.jivesoftware.openfire.pubsub.DefaultPubSubPersistenceProvider - An exception occurred while creating a node (UniqueIdentifier{serviceId='user2@openfirechat.net', nodeId='eu.siacs.conversations.axolotl.bundles:1526173104'}) in the database.
java.sql.SQLIntegrityConstraintViolationException: Duplicate entry 'user2@openfirechat.net-eu.siacs.conversations.axolotl.bundles:1526173104' for key 'PRIMARY'
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:118) ~[mysql-connector-j-8.2.0.jar:8.2.0]
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122) ~[mysql-connector-j-8.2.0.jar:8.2.0]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:912) ~[mysql-connector-j-8.2.0.jar:8.2.0]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1054) ~[mysql-connector-j-8.2.0.jar:8.2.0]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1003) ~[mysql-connector-j-8.2.0.jar:8.2.0]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeLargeUpdate(ClientPreparedStatement.java:1312) ~[mysql-connector-j-8.2.0.jar:8.2.0]
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdate(ClientPreparedStatement.java:988) ~[mysql-connector-j-8.2.0.jar:8.2.0]
    at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:136) ~[commons-dbcp2-2.9.0.jar:2.9.0]
    at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:136) ~[commons-dbcp2-2.9.0.jar:2.9.0]
    at org.jivesoftware.openfire.pubsub.DefaultPubSubPersistenceProvider.createNode(DefaultPubSubPersistenceProvider.java:322) ~[xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.pubsub.CachingPubsubPersistenceProvider.process(CachingPubsubPersistenceProvider.java:387) ~[xmppserver-4.8.1.jar:4.8.1]
    at java.util.ArrayList.forEach(ArrayList.java:1541) [?:?]
    at org.jivesoftware.openfire.pubsub.CachingPubsubPersistenceProvider.flushPendingNodes(CachingPubsubPersistenceProvider.java:159) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.pubsub.CachingPubsubPersistenceProvider.flushPendingChanges(CachingPubsubPersistenceProvider.java:556) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.pubsub.CachingPubsubPersistenceProvider$1.run(CachingPubsubPersistenceProvider.java:110) [xmppserver-4.8.1.jar:4.8.1]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
    at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
    at java.lang.Thread.run(Thread.java:829) [?:?]
2024.06.08 16:36:08.539 ERROR [socket_c2s_ssl-thread-17]: org.jivesoftware.openfire.nio.NettyConnection - Problem during connection close or cleanup
io.netty.handler.ssl.SslClosedEngineException: SSLEngine closed already
    at io.netty.handler.ssl.SslHandler.wrap(SslHandler.java:905) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.handler.ssl.SslHandler.wrapAndFlush(SslHandler.java:821) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.handler.ssl.SslHandler.flush(SslHandler.java:802) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:925) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:907) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:125) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:925) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:941) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:966) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:934) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at org.jivesoftware.openfire.nio.NettyConnection.close(NettyConnection.java:215) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.Connection.close(Connection.java:177) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.nio.NettyConnectionHandler.channelUnregistered(NettyConnectionHandler.java:163) [xmppserver-4.8.1.jar:4.8.1]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:219) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:195) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelUnregistered(AbstractChannelHandlerContext.java:188) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelUnregistered(DefaultChannelPipeline.java:1388) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:215) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:195) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.DefaultChannelPipeline.fireChannelUnregistered(DefaultChannelPipeline.java:821) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:821) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:566) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at java.lang.Thread.run(Thread.java:829) [?:?]
2024.06.08 16:36:15.245 ERROR [socket_c2s_ssl-thread-2]: org.jivesoftware.openfire.nio.NettyConnection - Problem during connection close or cleanup
io.netty.handler.ssl.SslClosedEngineException: SSLEngine closed already
    at io.netty.handler.ssl.SslHandler.wrap(SslHandler.java:905) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.handler.ssl.SslHandler.wrapAndFlush(SslHandler.java:821) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.handler.ssl.SslHandler.flush(SslHandler.java:802) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:925) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:907) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:125) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:925) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:941) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:966) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:934) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at org.jivesoftware.openfire.nio.NettyConnection.close(NettyConnection.java:215) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.Connection.close(Connection.java:177) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.nio.NettyConnectionHandler.channelUnregistered(NettyConnectionHandler.java:163) [xmppserver-4.8.1.jar:4.8.1]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:219) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:195) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelUnregistered(AbstractChannelHandlerContext.java:188) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelUnregistered(DefaultChannelPipeline.java:1388) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:215) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:195) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.DefaultChannelPipeline.fireChannelUnregistered(DefaultChannelPipeline.java:821) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:821) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:566) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at java.lang.Thread.run(Thread.java:829) [?:?]
2024.06.08 16:37:03.256 ERROR [socket_c2s_ssl-thread-3]: org.jivesoftware.openfire.nio.NettyConnection - Problem during connection close or cleanup
io.netty.handler.ssl.SslClosedEngineException: SSLEngine closed already
    at io.netty.handler.ssl.SslHandler.wrap(SslHandler.java:905) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.handler.ssl.SslHandler.wrapAndFlush(SslHandler.java:821) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.handler.ssl.SslHandler.flush(SslHandler.java:802) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:925) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:907) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:125) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:925) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:941) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:966) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:934) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at org.jivesoftware.openfire.nio.NettyConnection.close(NettyConnection.java:215) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.Connection.close(Connection.java:177) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.nio.NettyConnectionHandler.channelUnregistered(NettyConnectionHandler.java:163) [xmppserver-4.8.1.jar:4.8.1]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:219) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:195) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelUnregistered(AbstractChannelHandlerContext.java:188) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelUnregistered(DefaultChannelPipeline.java:1388) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:215) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:195) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.DefaultChannelPipeline.fireChannelUnregistered(DefaultChannelPipeline.java:821) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:821) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:566) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at java.lang.Thread.run(Thread.java:829) [?:?]
2024.06.08 16:38:14.848 ERROR [socket_c2s_ssl-thread-4]: org.jivesoftware.openfire.nio.NettyConnection - Problem during connection close or cleanup
io.netty.handler.ssl.SslClosedEngineException: SSLEngine closed already
    at io.netty.handler.ssl.SslHandler.wrap(SslHandler.java:905) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.handler.ssl.SslHandler.wrapAndFlush(SslHandler.java:821) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.handler.ssl.SslHandler.flush(SslHandler.java:802) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:925) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:907) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:125) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:925) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:941) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:966) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:934) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at org.jivesoftware.openfire.nio.NettyConnection.close(NettyConnection.java:215) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.Connection.close(Connection.java:177) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.nio.NettyConnectionHandler.channelUnregistered(NettyConnectionHandler.java:163) [xmppserver-4.8.1.jar:4.8.1]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:219) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:195) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelUnregistered(AbstractChannelHandlerContext.java:188) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelUnregistered(DefaultChannelPipeline.java:1388) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:215) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:195) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.DefaultChannelPipeline.fireChannelUnregistered(DefaultChannelPipeline.java:821) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:821) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:566) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at java.lang.Thread.run(Thread.java:829) [?:?]
2024.06.08 16:40:26.265 ERROR [socket_c2s_ssl-thread-6]: org.jivesoftware.openfire.nio.NettyConnection - Problem during connection close or cleanup
io.netty.handler.ssl.SslClosedEngineException: SSLEngine closed already
    at io.netty.handler.ssl.SslHandler.wrap(SslHandler.java:905) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.handler.ssl.SslHandler.wrapAndFlush(SslHandler.java:821) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.handler.ssl.SslHandler.flush(SslHandler.java:802) ~[netty-handler-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:925) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:907) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:125) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:925) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:941) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:966) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:934) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at org.jivesoftware.openfire.nio.NettyConnection.close(NettyConnection.java:215) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.Connection.close(Connection.java:177) [xmppserver-4.8.1.jar:4.8.1]
    at org.jivesoftware.openfire.nio.NettyConnectionHandler.channelUnregistered(NettyConnectionHandler.java:163) [xmppserver-4.8.1.jar:4.8.1]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:219) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:195) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelUnregistered(AbstractChannelHandlerContext.java:188) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelUnregistered(DefaultChannelPipeline.java:1388) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:215) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelUnregistered(AbstractChannelHandlerContext.java:195) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.DefaultChannelPipeline.fireChannelUnregistered(DefaultChannelPipeline.java:821) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:821) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:566) [netty-transport-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.100.Final.jar:4.1.100.Final]
    at java.lang.Thread.run(Thread.java:829) [?:?] 

Hello
I also faced this problem. But I did not find a solution for it