This requires Kotlin 1.2 versions of core and serialization (core-1.2 and serialization-1.2 respectively), which are just "shell" modules and which compile the existing source code with Kotlin 1.2. The 1.2 plugin does not work with the current version of Gradle and so the 1.2 compiler has to be called directly.
Now with two versions of Kotlin in the code base, each module needs to have its version manually specified to ensure a clean separation. Otherwise, the default Kotlin version can override 1.2 when needed.
Some of the code was tidied-up or improved to enable it to be cross-compiled. For post-1.2 APIs being used, they have been copied into core-1.2 with the same method signatures. OpenTelemetryComponent was moved to node-api, along with the dependency, to avoid also having a 1.2 version for the opentelemetry module.
Major changes due to JDK 17:
1. JDK17 JCE Provider now has built-in support for eddsas, corda uses
the bouncycastle (i2p) implementation. This PR removes the conflicting
algorithms from the built-in JCE provider.
2. JavaScript scripting has been removed from the JDK, the corda log4j config was using
scripting to conditionally output additional diagnostic info if the MDC
was populated. This PR has removed the scripting.
3. The artifactory plug-ins used are now deprecated, this PR has removed them
and uses the same code as Corda 5 for publishing to artifactory.
4. Javadoc generation has been modified to use the latest dokka plug-ins.
5. Gradle 7.6 has implemented an incredibly annoying change where transitive
dependencies are not put on the compile classpath, so that they have to be
explicitly added as dependencies to projects.
6. Mockito has been updated, which sadly meant that quite a few source files
have to changes to use the new (org.mockito.kotlin) package name. This makes
this PR appear much larger than it is.
7. A number of tests have been marked as ignored to get a green, broadly they fall
into 3 classes.
The first is related to crypto keypair tests, it appears some logic
in the JDK prefers to use the SunJCE implementation and we prefer to use
bouncycastle. I believe this issue can be fixed with better test setup.
The second group is related to our use of a method called "uncheckedCast(..)",
the purpose of this method was to get rid of the annoying unchecked cast compiler
warning that would otherwise exist. It looks like the Kotlin 1.9 compiler type
inference differs and at runtime sometimes the type it infers is "Void" which causes
an exception at runtime. The simplest solution is to use an explicit cast instead of
unchecked cast, Corda 5 have removed unchecked cast from their codebase.
The third class are a number of ActiveMQ tests which appear to have a memory leak somewhere.
