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NullPointerException when JPQL UPDATE assignment operation omits optional identification variable

Internal Exception: java.lang.NullPointerException: Cannot invoke "org.eclipse.persistence.internal.jpa.jpql.Declaration.getDescriptor ()" because the return value of "org.eclipse.persistence.internal ...
GitHub

Bunch of errors after adding field to kotlin class - InvocationTargetException, classReload() exception, java.lang.NullPointerException: Cannot invoke "java.net.URL.getFile()"

I quicky tried the HotswapAgent on my kotlin project, but simply adding a field to a class resulted in this log: HOTSWAP AGENT: 10:30:11.003 ERROR ...