SAP Knowledge Base Article - Preview

2425712 - Blank portal screen due to ClassNotFoundException:


  • After NetWeaver upgrade or patching you receive a blank screen
  • Checking the developer/Default Trace log files you see an error similar to the below:
    "Error in starting application [].
    [EXCEPTION] Error in starting application [].
    Caused by: Error occurred when invoking start methods of web container extensions for [] application.
    Caused by: java.lang.NoClassDefFoundError: com/sap/ui/theming/engine/util/logging/ILoggerFactory
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forNameFW(
    at java.lang.Class.forName("



  • SAP NetWeaver Application Server for Java 7.3x and higher releases
  • Enterprise Portal


SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP enhancement package 1 for SAP NetWeaver 7.3


blank, update, upgrade, patch, chrome, firefox, ie, msie, chrome 56, empty, white, portalthemespersistence , KBA , EP-PIN-PRT , Portal Runtime , EP-PIN-TOL , Themes / Portal UI Theme Designer / Theme Editor , Problem

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