Fix the 'Unable to restore the previous TimeZone' error in GWT

Author: zemna
Date: April 17, 2021
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You may have following error message when you start Google App Engine Server.

[note] Initializing App Engine server [ERROR] Unable to start App Engine server java.lang.RuntimeException: Unable to restore the previous TimeZone at at at at at at at Caused by: java.lang.NoSuchFieldException: defaultZoneTL at java.lang.Class.getDeclaredField( at ... 6 more [ERROR] shell failed in doStartupServer method [/note]

The solution is to add an extra parameter in your virtual machine run configuration.

[note] -Dappengine.user.timezone=UTC [/note]


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