We do keep a singleton ClientRequestor around forever. Perhaps this is just wrong? Is ClientRequestor cheap to make each time?
One of my colleagues found that occasionally closing and re-creating the ClientRequestor avoids this problem, but I’d like to know why. I think you can see that image here: https://drive.google.com/file/d/1gKDrg4-tRs7WSPbsqQ7Bu-UfhBPu4Fdj/view?usp=sharing john [rg] <https://www.redpointglobal.com/> John Lilley Data Management Chief Architect, Redpoint Global Inc. 888 Worcester Street, Suite 200 Wellesley, MA 02482 M: +1 7209385761<tel:+1%207209385761> | john.lil...@redpointglobal.com<mailto:john.lil...@redpointglobal.com> From: Justin Bertram <jbert...@apache.org> Sent: Monday, January 16, 2023 9:48 AM To: users@activemq.apache.org Subject: Re: Messages accumulating in management queue *** [Caution] This email is from an external source. Please use caution responding, opening attachments or clicking embedded links. *** > I don’t know if that image comes through the mailing list... I can't see your image. For what it's worth, attachments don't usually make it through the list. Could you upload the image to another location and provide a link? Also, could you provide the full stack-trace of the NPE? I don't see in your code where you're actually closing the ClientRequestor so that might be a problem. Without more details it's impossible to say. Justin On Mon, Jan 16, 2023 at 10:31 AM John Lilley <john.lil...@redpointglobal.com.invalid<mailto:john.lil...@redpointglobal.com.invalid>> wrote: Greetings! We are using the Artemis queue-based management APIs, and noticed that one of the two management queues that appears in the console starts to grow without bound: I don’t know if that image comes through the mailing list, but it shows two of the xn--activemq-2p3d.management<https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fxn--activemq-2p3d.management&c=E,1,yM5VuqjniGEfl7K4rM70Xa-2jC5pkpu2WMCuv2o_9ssgUAyqDzgAfPDtdn-xMCHxrbyaUxPnF2oUZkGoCF_o-vv_o42p3PRnI9YguDv7nT8RO5syVzebSQ,,&typo=1&ancr_add=1><UUID>” queues, and one of the counts is in the 100s. It just keeps growing and growing by about 300 per minute. I’ve tried to browse this queue on the management console, but the browse() operation shows an NPE: java.lang.NullPointerException : Cannot invoke "org.apache.activemq.artemis.core.paging.cursor.PageSubscription.iterator(boolean)" because "this.this$0.pageSubscription" is null The calls we are making are like: String resourceName = ResourceNames.QUEUE + queueName; ClientRequestor client = getClient(); ClientSession clientSession = … ClientMessage request = clientSession.createMessage(false); ManagementHelper.putAttribute(request, resourceName, attributeName); ClientMessage reply = client.request(request); Or ClientRequestor client = getClient(); ClientMessage request = clientSession.createMessage(false); ManagementHelper.putAttribute(request, resourceName, attributeName); ClientMessage reply = client.request(request); if (ManagementHelper.hasOperationSucceeded(reply)) { for (var value : (Object[])ManagementHelper.getResult(reply, Object.class)) { result.add(value.toString()); } Any idea what we are doing wrong? This happens on windows or linux Artemis version 2.27.0. java –version openjdk 17.0.3 2022-04-19 OpenJDK Runtime Environment Temurin-17.0.3+7 (build 17.0.3+7) OpenJDK 64-Bit Server VM Temurin-17.0.3+7 (build 17.0.3+7, mixed mode, sharing) Thanks john [rg]<https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fwww.redpointglobal.com%2f&c=E,1,y0ymtXAc9XiBAplLMyDSTkbZPAR64gUyHhSGTjs8RK2_en31lUYrNYUf9Da_DM9WCm4_pRY8h4_s7PAUvD5SJfK1UCvi3Clxrot9XAr38A,,&typo=1> John Lilley Data Management Chief Architect, Redpoint Global Inc. 888 Worcester Street, Suite 200 Wellesley, MA 02482 M: +1 7209385761<tel:+1%207209385761> | john.lil...@redpointglobal.com<mailto:john.lil...@redpointglobal.com> PLEASE NOTE: This e-mail from Redpoint Global Inc. (“Redpoint”) is confidential and is intended solely for the use of the individual(s) to whom it is addressed. If you believe you received this e-mail in error, please notify the sender immediately, delete the e-mail from your computer and do not copy, print or disclose it to anyone else. If you properly received this e-mail as a customer, partner or vendor of Redpoint, you should maintain its contents in confidence subject to the terms and conditions of your agreement(s) with Redpoint. PLEASE NOTE: This e-mail from Redpoint Global Inc. (“Redpoint”) is confidential and is intended solely for the use of the individual(s) to whom it is addressed. If you believe you received this e-mail in error, please notify the sender immediately, delete the e-mail from your computer and do not copy, print or disclose it to anyone else. If you properly received this e-mail as a customer, partner or vendor of Redpoint, you should maintain its contents in confidence subject to the terms and conditions of your agreement(s) with Redpoint.
