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Thank you for taking the time to raise this enhancement request. Support for later JDK levels with traditional WebSphere is something we are constantly evaluating. However, at present, the majority of WebSphere clients want their traditional WebSphere applications to be stable, with low investment. Oracle introduced a number of breaking changes in Java 9+ and so adding Java 11 to traditional WebSphere would force all applications to go through a costly migration with little to no benefit. This is why it is our intention to support traditional WebSphere 8.5.5 and 9.0.5 on Java 8 for a long time - see https://www.ibm.com/blog/announcement/ibm-websphere-application-server-support/
Given moving from Java 8 to Java 11 requires a costly migration, we believe it better to do that with additional business benefits. This is why we support later Java version with WebSphere Liberty and provide migration tools to help. WebSphere Liberty is a modern, lightweight runtime that can run traditional monolithic applications with high scale with high performance, in VMs, as well as being optimized to run modern lightweight cloud-native applications in containers. Our recommendation is therefore to run FileNet on Liberty when a later JDK level is required.