# Uncaught throwable while processing chunk **URL:** \ **Category:** Ignition\ **Created:** [January 29, 2019, 1:35pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-while-processing-chunk/22184 "2019-01-29T13:35:36Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![mcgheeiv](https://avatars.discourse-cdn.com/v4/letter/m/71c47a/32.png) [@mcgheeiv](https://forum.inductiveautomation.com/u/mcgheeiv)\ **Post date:** [January 29, 2019, 1:35pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-while-processing-chunk/22184/1 "2019-01-29T13:35:36Z")
Ignition version 7.8.3 The following are flooding the gateway console immediately prior to Ignition “locking up.” I am not sure where to even start looking for the cause, any help is greatly appreciated. ```auto INFO | jvm 2 | 2019/01/25 06:05:41 | ERROR [TCPServerChannel UAChannel] [06:05:41,012]: Uncaught throwable while processing chunk. INFO | jvm 2 | 2019/01/25 06:05:41 | java.lang.ArrayIndexOutOfBoundsException: 2 INFO | jvm 2 | 2019/01/25 06:05:41 | at com.inductiveautomation.xopc.common.stack.UAChannel.getMessageType(UAChannel.java:758) INFO | jvm 2 | 2019/01/25 06:05:41 | at com.inductiveautomation.xopc.common.stack.UAChannel.processChunk(UAChannel.java:764) INFO | jvm 2 | 2019/01/25 06:05:41 | at com.inductiveautomation.xopc.common.stack.UAChannel.access$000(UAChannel.java:62) INFO | jvm 2 | 2019/01/25 06:05:41 | at com.inductiveautomation.xopc.common.stack.UAChannel$ProcessChunk.run(UAChannel.java:1581) INFO | jvm 2 | 2019/01/25 06:05:41 | at com.inductiveautomation.xopc.client.stack.SerialExecutionQueue$RunnableExecutor.execute(SerialExecutionQueue.java:100) INFO | jvm 2 | 2019/01/25 06:05:41 | at com.inductiveautomation.xopc.client.stack.SerialExecutionQueue$RunnableExecutor.execute(SerialExecutionQueue.java:97) INFO | jvm 2 | 2019/01/25 06:05:41 | at com.inductiveautomation.xopc.client.stack.SerialExecutionQueue$PollAndExecute.run(SerialExecutionQueue.java:75) INFO | jvm 2 | 2019/01/25 06:05:41 | at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) INFO | jvm 2 | 2019/01/25 06:05:41 | at java.util.concurrent.FutureTask.run(Unknown Source) INFO | jvm 2 | 2019/01/25 06:05:41 | at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source) INFO | jvm 2 | 2019/01/25 06:05:41 | at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) INFO | jvm 2 | 2019/01/25 06:05:41 | at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) INFO | jvm 2 | 2019/01/25 06:05:41 | at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) INFO | jvm 2 | 2019/01/25 06:05:41 | at java.lang.Thread.run(Unknown Source) ``` ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [January 29, 2019, 1:54pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-while-processing-chunk/22184/2 "2019-01-29T13:54:04Z")
We’ve seen this occur in 2 scenarios: 1. the gateway is already running out of memory for another reason and this is a side effect 2. IT is running a network/security scanner that has found the open OPC UA port and started sending it test data You might need to call support and work with them to figure out which is going on. They’ll need to look a look at the rest of your logs and your system in general. ---
**Author:** ![mcgheeiv](https://avatars.discourse-cdn.com/v4/letter/m/71c47a/32.png) [@mcgheeiv](https://forum.inductiveautomation.com/u/mcgheeiv)\ **Post date:** [January 29, 2019, 2:08pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-while-processing-chunk/22184/3 "2019-01-29T14:08:14Z")
Thanks for the quick reply Kevin! ---
**Author:** ![mcgheeiv](https://avatars.discourse-cdn.com/v4/letter/m/71c47a/32.png) [@mcgheeiv](https://forum.inductiveautomation.com/u/mcgheeiv)\ **Post date:** [January 30, 2019, 1:24pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-while-processing-chunk/22184/4 "2019-01-30T13:24:12Z")
The error below shows up periodically… Could it be part of the problem? How do I find the tag involved? ```auto 8:19:15 AM TagPropertyRecord Error deserializing value. java.lang.ClassCastException: Cannot coerce value 'null' into type: class java.lang.Integer at com.inductiveautomation.ignition.common.TypeUtilities.coerce(TypeUtilities.java:1293) at com.inductiveautomation.ignition.common.TypeUtilities.datasetFromJSON(TypeUtilities.java:2026) at com.inductiveautomation.ignition.gateway.sqltags.tagproviders.internal.config.TagPropertyRecord.getValue(TagPropertyRecord.java:136) at com.inductiveautomation.ignition.gateway.sqltags.tagproviders.internal.InternalTagStore._loadTags(InternalTagStore.java:1887) at com.inductiveautomation.ignition.gateway.sqltags.tagproviders.internal.InternalTagStore.loadTags(InternalTagStore.java:1709) at com.inductiveautomation.ignition.gateway.sqltags.tagproviders.internal.InternalTagStore$6.load(InternalTagStore.java:2095) at com.inductiveautomation.ignition.gateway.sqltags.tagproviders.internal.InternalTagStore$6.load(InternalTagStore.java:2088) at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527) at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2319) at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2282) at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2197) at com.google.common.cache.LocalCache.get(LocalCache.java:3937) at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3941) at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4824) at com.inductiveautomation.ignition.gateway.sqltags.tagproviders.internal.InternalTagStore.getDefinition(InternalTagStore.java:2111) at com.inductiveautomation.ignition.gateway.sqltags.tagproviders.internal.InternalTagStore.getProperty(InternalTagStore.java:2184) at com.inductiveautomation.ignition.gateway.sqltags.execution.tags.AbstractGatewayTag.getAttribute(AbstractGatewayTag.java:140) at com.inductiveautomation.ignition.gateway.sqltags.execution.tags.AbstractExecutableTag.getAttribute(AbstractExecutableTag.java:500) at com.inductiveautomation.ignition.common.sqltags.TagDefinition.getAttributesFrom(TagDefinition.java:598) at com.inductiveautomation.ignition.common.sqltags.TagDefinition.(TagDefinition.java:330) at com.inductiveautomation.ignition.common.sqltags.TagDefinition.(TagDefinition.java:321) at com.inductiveautomation.ignition.gateway.servlets.gateway.functions.SQLTags.wrap(SQLTags.java:436) at com.inductiveautomation.ignition.gateway.servlets.gateway.functions.SQLTags.getTag(SQLTags.java:184) at sun.reflect.GeneratedMethodAccessor115.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.inductiveautomation.ignition.gateway.servlets.gateway.AbstractGatewayFunction.invoke(AbstractGatewayFunction.java:209) at com.inductiveautomation.ignition.gateway.servlets.Gateway.doPost(Gateway.java:345) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at com.inductiveautomation.ignition.gateway.bootstrap.MapServlet.service(MapServlet.java:85) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:837) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1160) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1092) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) at org.eclipse.jetty.server.Server.handle(Server.java:518) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:308) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:244) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95) at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:246) at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:156) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572) at java.lang.Thread.run(Unknown Source) ``` ---
**Author:** ![GreggCavazos](https://avatars.discourse-cdn.com/v4/letter/g/90db22/32.png) [@GreggCavazos](https://forum.inductiveautomation.com/u/GreggCavazos)\ **Post date:** [May 3, 2019, 6:03pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-while-processing-chunk/22184/5 "2019-05-03T18:03:23Z")
> [@Kevin.Herron](#): > > - the gateway is already running out of memory for another reason and this is a side effect > - IT is running a network/security scanner that has found the open OPC UA port and started sending it test data We had an issue exactly like the described, it turned out to be scenario 2, we were not notified on time of the pen-testing in place, our IGN logs were flooded with logs like the above and took us a few minutes to realize the problem, we had to restart the gateway v7.8.4. Would a later version be more resilient to attacks without manual intervention? ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [May 3, 2019, 6:47pm UTC](https://forum.inductiveautomation.com/t/uncaught-throwable-while-processing-chunk/22184/6 "2019-05-03T18:47:30Z")
Yes, fixed for 7.9.11. Should be released this month…