I am using Jenkins LTS 1.609.2. My app heavily depends on Jenkins remote
APIs to run new job then fetch the job result later.

I noticed the Jenkins server throws 404 not found error when fetching the
detail job information via queue item API.

The Jenkins server was not restarted and always runs well.

>From the log of my app, I could see the 404 responses few times, it does
not always happens. However it occurred again in few queue number.

I know there is a known bug JENKINS-27256 that had been fixed in 1.603.
Looks like they are different issues. Does Jenkins only store queue item
records in memory? I observed the queue number reseted after restarting
Jenkins server. And is Jenkins using weak or soft reference to keep the
queue item records? So they might lost if GC happens.

*Failed to fetch job status from       queue url
'http://127.0.0.1:8888/queue/item/378/
<http://127.0.0.1:8888/queue/item/378/>', received code '404' and message
'<html>*

*63736 <head>*

*63737 <meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1"/>*

*63738 <title>Error 404 Not Found</title>*

*63739 </head>*

*63740 <body><h2>HTTP ERROR 404</h2>*

*63741 <p>Problem accessing /queue/item/378/api/json. Reason:*

*63742 <pre>    Not Found</pre></p><hr /><i><small>Powered by
Jetty://</small></i><br/>*

*...*

*<body><h2>HTTP ERROR 404</h2>*

*63830 <p>Problem accessing /queue/item/382/api/json. Reason:*
*...*

*64224 <body><h2>HTTP ERROR 404</h2>*

*64225 <p>Problem accessing /queue/item/389/api/json. Reason:*

Kane

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