Problem with Preview plugin

[Alexander]

Hello everyone!

I have some problem. I use confluence in docker. Version confluence 6.3.3

And find some problem with Addon 'plugin' confluence preview v.5.0.2

When i click on attachment to preview, it's loading and then nothing hepend in older version 6.0.1 everything good.

Error 

[http-nio-8090-exec-5] [common.error.jersey.ThrowableExceptionMapper] toResponse Uncaught exception thrown by REST service: Could not initialize class com.atlassian.plugins.$
| url: /rest/files/1.0/files/content/15761412/mi$
java.lang.NoClassDefFoundError: Could not initialize class com.atlassian.plugins.conversion.convert.image.ImagingConverter

Can any help?

Thank you

[Alexander]

Thank you, but i solved problem. Problem was be with that in docker need create image with oracle java 8 and dont use openjdk 8.

[AnnWorley]

I found an article (Unable to add attachments or view existing attachment after server migration) with similar symptoms, and the error: 

Could not initialize class com.atlassian.plugins.conversion.convert.image.ImagingConverter

• Please try clearing the plugin cache as described in: How to clear Confluence plugins cache.

If the attachment has fonts that are not installed on the server you should be able to find an entry in the log like:

FontFamily 'Font_Name' not found

 You will need to install the font on the OS level to resolve that.

[Jorg]

Thank you