# Upgrade from 8.1.27 to 8.1.37 and now cannot start JVM

**URL:** <https://forum.inductiveautomation.com/t/upgrade-from-8-1-27-to-8-1-37-and-now-cannot-start-jvm/87872>\
**Category:** Ignition\
**Created:** [March 25, 2024, 11:06pm UTC](https://forum.inductiveautomation.com/t/upgrade-from-8-1-27-to-8-1-37-and-now-cannot-start-jvm/87872 "2024-03-25T23:06:09Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![ematschke](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/ematschke/32/7544_2.png) [@ematschke](https://forum.inductiveautomation.com/u/ematschke)\
**Post date:** [March 25, 2024, 11:06pm UTC](https://forum.inductiveautomation.com/t/upgrade-from-8-1-27-to-8-1-37-and-now-cannot-start-jvm/87872/1 "2024-03-25T23:06:09Z")

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I have tried upgrading from Ignition 8.1.27 to 8.1.37 and when the gateway restarts, it just hangs. In the Wrapper.log, it has an error about cannot start the JVM.  
I uninstalled .37 and reinstalled .27 and it starts up OK. The wrapper.log is overwritten, so I don't know the exact code, but it definitely could not start the JVM.

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**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:** [March 25, 2024, 11:06pm UTC](https://forum.inductiveautomation.com/t/upgrade-from-8-1-27-to-8-1-37-and-now-cannot-start-jvm/87872/2 "2024-03-25T23:06:39Z")

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Can you zip and then upload your wrapper.log file(s)? Maybe the error is in an old one?

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**Author:** ![ematschke](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/ematschke/32/7544_2.png) [@ematschke](https://forum.inductiveautomation.com/u/ematschke)\
**Post date:** [March 25, 2024, 11:25pm UTC](https://forum.inductiveautomation.com/t/upgrade-from-8-1-27-to-8-1-37-and-now-cannot-start-jvm/87872/3 "2024-03-25T23:25:22Z")

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will try to upload the wrapper log here.  
[wrapper.zip](https://forum.inductiveautomation.com/uploads/short-url/65sBOVylMpTmETKmOyrh8TPwUNi.zip) (373.2 KB)

Looks like it had Unrecognized VM option 'Use ConcMarkSweepGC'  
and so could not create the Java Virtual Machine.

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**Author:** ![bschroeder](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bschroeder/32/13260_2.png) [@bschroeder](https://forum.inductiveautomation.com/u/bschroeder)\
**Post date:** [March 25, 2024, 11:27pm UTC](https://forum.inductiveautomation.com/t/upgrade-from-8-1-27-to-8-1-37-and-now-cannot-start-jvm/87872/4 "2024-03-25T23:27:30Z")

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> [@ematschke](#):
>
> ConcMarkSweepGC

Remove this from your ignition.conf file and try again.

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<div class="post-metadata">

**Author:** ![ematschke](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/ematschke/32/7544_2.png) [@ematschke](https://forum.inductiveautomation.com/u/ematschke)\
**Post date:** [March 25, 2024, 11:40pm UTC](https://forum.inductiveautomation.com/t/upgrade-from-8-1-27-to-8-1-37-and-now-cannot-start-jvm/87872/5 "2024-03-25T23:40:18Z")

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that appears to have worked. Thanks bschroeder

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**Author:** ![bschroeder](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bschroeder/32/13260_2.png) [@bschroeder](https://forum.inductiveautomation.com/u/bschroeder)\
**Post date:** [March 25, 2024, 11:50pm UTC](https://forum.inductiveautomation.com/t/upgrade-from-8-1-27-to-8-1-37-and-now-cannot-start-jvm/87872/6 "2024-03-25T23:50:33Z")

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Yep! Glad it worked.