There are a couple different ways to install Java with WebSphere. The most common way is to simply use the bundled Java SDK. Even with this, sometimes you need to update the Java SDK outside of a Fix Pack. To do that, you need to download an update specifically for the bundled Java SDK. Those can be found here:
https://www.ibm.com/support/pages/node/6209712#Java8B
You can download the appropriate version, unzip it, add it as a repository to Installation Manager, and then click "Update" to update the WAS bundled JVM.
An example scenario is this:
I have a customer with WAS 8.5.5.11 installed in a secure and regulated environment. They were told they needed to install WAS 8.5.5 FP 23 (FP24 is available, but it has not yet been approved for installation in this environment) and Java 8.0.8.5. WAS 8.5.5.23 comes bundled with Java 8.0.7.20. So we needed to apply the 8.5.5.23 Update via Installation Manager, and then apply the Bundled Java SDK 8.0.8.5 Update via Installation Manager, and all was good.
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