Troubleshooting
Problem
This document addresses a cause of the message "Error 500: java.lang.NoClassDefFoundError: sun/misc/BASE64Decoder", which is received from IBM i Access for Web.
Resolving The Problem
When you connect to the IBM i OS with IBM i Access for Web, the error message "Error 500: java.lang.NoClassDefFoundError: sun/misc/BASE64Decoder" is shown in the browser session.
It was found that the application server used for IBM i Access for Web had Java home set to /QOpenSys/QIBM/ProdData/JavaVM/jdk11/64bit (Java 11).
This setting can be found by going into IBM Web Administration (http://hostname:2001/HTTPAdmin) and follow the steps:
- Select "Application Servers" Tab
- Use the pull-down at "Server:" to select the IBM i Access for Web Application Server
- At the left pane, select "Properties"
- At the right pane, select "JRE" tab
Changing this Java home to Java 8 (/QOpenSys/QIBM/ProdData/JavaVM/jdk80/64bit) and restart of the application server resolved the problem.
The following example screen capture shows the correct parameter:
IBM i Access for Web does not support Java 11 and with its withdrawal from support on September 30, 2023 it will never support Java 11.
Document Location
Worldwide
[{"Type":"MASTER","Line of Business":{"code":"LOB57","label":"Power"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSB2FY","label":"IBM i Access Family"},"ARM Category":[{"code":"a8m0z0000000CU4AAM","label":"IBM i Access-\u003EAccess for Web"}],"ARM Case Number":"","Platform":[{"code":"PF012","label":"IBM i"}],"Version":"All Versions"}]
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Document Information
Modified date:
15 February 2023
UID
ibm16856967