Some developers try and change the Java compiler setting within Eclipse from Java 1.5 to Java 1.8, but that only works temporarily. As soon as a new Maven build takes place, the JDK version reverts ...

With the latest release of the JDK, Oracle has embarked upon a new Java versioning scheme. There has always been a disconnect between the branding of the Java product and the version of the underlying ...

HAPI FHIR now requires Java 11 or newer in order to build (JDK 8 is still supported to use the library however, the JDK 11 requirement is only for actually compiling HAPI FHIR itself).

I guess you're not using any build tool. For the standalone Java files, the extension will use the language level from the default JDK runtime you configured in user setting. If you use maven or ...