Confluence Shows Unreadable CAPTCHA

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Symptoms

Users get a completely unreadable CAPTCHA, for instance when they failed to login to Confluence. Here is an example screenshot:

Cause

Unsupported version of Oracle JDK or  a non-standard JDK is used such as OpenJDK.

Resolution

  1. Download the standard and supported Oracle JDK according to supported platforms.
  2. Configure Confluence to use the standard JDK.

 

 

 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

Last modified on Nov 2, 2018

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