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Nope, it could run any language that targeted JVM bytecode and HP-UX Vault already provided container like support for Java Application Servers.

> any language that targeted JVM bytecode

Any language similar to Java. Small subset of languages.

So IBM TIMI then, or dozens of other examples that I can pull out of the hat since 1961.

It is a big crufty old hat full of legacy papers and old scanned computer history.