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From "Adrian Crum (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OFBIZ-5710) Running OFBIZ with jsvc (Commons Daemon) Breaks JobPoller
Date Thu, 14 Aug 2014 12:53:12 GMT

    [ https://issues.apache.org/jira/browse/OFBIZ-5710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14096929#comment-14096929

Adrian Crum commented on OFBIZ-5710:

My patch guarantees that only the Start instance created by Commons Daemon will be used. Why
will that not work?

> Running OFBIZ with jsvc (Commons Daemon) Breaks JobPoller
> ---------------------------------------------------------
>                 Key: OFBIZ-5710
>                 URL: https://issues.apache.org/jira/browse/OFBIZ-5710
>             Project: OFBiz
>          Issue Type: Bug
>          Components: framework
>    Affects Versions: Release Branch 13.07, Trunk
>            Reporter: Justen Walker
>              Labels: jsvc
>         Attachments: R13_Start.java.patch, daemon-start.png, static-start.png
> h2. Symptoms
> All jobs in JobSandbox are stuck in SERVICE_PENDING even though they should be run.
> h2. Root Cause
> {{org.ofbiz.base.start.Start}} implements a Singleton pattern but Commons Daemon breaks
the singleton contract by instantiating it through reflection.  This means that there are
2 instances of {{Start}} in a running application using {{jsvc}}
> When running a heap dump of an OFBiz server running with {{jsvc}}; I noticed two instances
of {{Start}} are present: *#1* (which was created by {{DaemonLoader}}) and *#2* (created during
static init)
> From the attached screenshots, you can see that the static {{instance}} variable points
to *#2* instead of *#1*.
> h3. Daemon Start
> !daemon-start.png|width=900,height=500!
> h3. Static Start
> !static-start.png|width=900,height=500!
> This is a problem because *#1* actually contains the correct application state, but anyone
using {{Start.getInstance()}} will get *#2* which has not been initialized.  
> At least one service suffering from this is the {{JobPoller}} which has a few lines in
the polling code:
> {code:java}
> while (Start.getInstance().getCurrentState() != Start.ServerState.RUNNING) {
>   Thread.sleep(1000);
> }
> {code}
> Which will never be able to exit - thus all scheduled jobs will never be run.
> I noticed this in 13.07 but it could affect other versions - I have not checked them.

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