Re: [isabelle] Plugin error with Isabelle-2016

I experience this type of failure on the next start up after having
terminated Isabelle abnormally (e.g. by killing the process).  When the
failure occurs, exiting JEdit and restarting Isabelle results in a normal
startup.  There is evidently some state information that is used on startup
that is not left in the proper condition on an abnormal shutdown.
(I use Isabelle on Ubuntu 14.04LTS using the default Unity window manager.)

Could it be that the failures you are seeing are the result of abnormal
shutdowns of the immediately preceding sessions?

							- Gene Stark

On 07/25/2016 05:56 AM, Makarius wrote:
> On 25/07/16 09:35, Dominic Mulligan via Cl-isabelle-users wrote:
>> Intermittently when starting Isabelle 2016 there is some failure
>> starting isabelle.jedit.Plugin.  I get a popup containing the
>> following information:
>> /auto/homes/dpm36/LocalInstalls/Isabelle2016/src/Tools/jEdit/dist/jars/Isabelle-jEdit.jar:
>> Cannot start: java.lang.NoClassDefFoundError: scala/Function0
>> Try updating to a newer version of the plugin.
> Does "intermittently" mean that the failure happens every time you start
> Isabelle/jEdit, or only sometimes?
> Technically, it means that the JVM cannot access certain jars, notably
> the ones of Scala itself. Without that, Isabelle does not work at all.
>> Strangely, after quitting and restarting Isabelle/jEdit after seeing
>> this error, all mathematical symbols in the file I was originally
>> trying to open when the error occurred are no longer rendered.
> You need to make sure that files are loaded with the encoding
> UTF-8-Isabelle (see the menu File / Reload with Encoding).
> This encoding is provided by the Isabelle plugin of jEdit, so without
> the plugin editor falls back on something else and makes that persistent
> for next time.
> 	Makarius

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