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  1. Guacamole
  2. GUACAMOLE-855

Authentification - Illegal reflective access

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Minor
    • Resolution: Invalid
    • Affects Version/s: 1.0.0
    • Fix Version/s: None
    • Component/s: guacamole-auth-ldap
    • Labels:
      None
    • Environment:
      Microsoft AD DS: Windows Server 2019 Standard (1809), x64
      Guacamole: 1.0.0 (Ubuntu 18.04.2 LTS, x64)

      Description

      I installed guacamole in a test environment. There also exist a virtual Machine with Microsoft Active Directory Domain Service (AD DS). For Guacamole i configure the extenstion guacamole-auth-ldap for authentication to the AD DS.

      Now unser Username schema is "surname.givenname. When a user successfully logged on to guacamole, it logs follow messages to /var/log/tomcat8/catalina.out:

       

      20:30:34.840 [http-nio-8080-exec-2] INFO  o.a.g.r.auth.AuthenticationService - User "mueller.hans" successfully authenticated from [192.168.123.2, 127.0.0.1].
      WARNING: An illegal reflective access operation has occurred
      WARNING: Illegal reflective access by org.apache.ibatis.ognl.OgnlRuntime (file:/etc/guacamole/extensions/guacamole-auth-jdbc-mysql-1.0.0.jar) to method java.util.Collections$UnmodifiableCollection.isEmpty()
      WARNING: Please consider reporting this to the maintainers of org.apache.ibatis.ognl.OgnlRuntime
      WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
      WARNING: All illegal access operations will be denied in a future release
      

      I have done some tests with other username schemas, e.g. "-" or without any character between it. The warnings were no longer logged.

       

      I do not know what is it mean with "An illegal reflective access operation has occurred".

      Can the warning ignored?!

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            • Assignee:
              Unassigned
              Reporter:
              Whitemoon Whitemoon
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              • Created:
                Updated:
                Resolved: