Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via GitHub by kjayashankar
, 1 year ago
via GitHub by roastnewt
, 1 year ago
This exception has no message.
via GitHub by HollishKid
, 1 year ago
This exception has no message.
via Eclipse Bugzilla by loskutov, 4 months ago
java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)	at java.util.HashMap$KeyIterator.next(HashMap.java:1461)	at io.moquette.spi.persistence.MapDBSessionsStore.max(MapDBSessionsStore.java:179)	at io.moquette.spi.persistence.MapDBSessionsStore.nextPacketID(MapDBSessionsStore.java:168)	at io.moquette.spi.ClientSession.nextPacketId(ClientSession.java:170)	at io.moquette.spi.impl.ProtocolProcessor.route2Subscribers(ProtocolProcessor.java:555)	at io.moquette.spi.impl.ProtocolProcessor.processPublish(ProtocolProcessor.java:418)	at io.moquette.server.netty.NettyMQTTHandler.channelRead(NettyMQTTHandler.java:61)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)	at io.moquette.server.netty.metrics.MessageMetricsHandler.channelRead(MessageMetricsHandler.java:46)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:276)	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:263)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)	at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)	at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)	at io.moquette.server.netty.metrics.BytesMetricsHandler.channelRead(BytesMetricsHandler.java:47)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)	at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:266)	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318)	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304)	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:846)	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)	at java.lang.Thread.run(Thread.java:745)