When Notes 14 FP2 came out, I made a blog post detailing a change that HCL made to the JRE classpaths that Designer uses for compilation. Specifically, since jvm/lib/ext is not present in newer Java versions, people had found that they manually had to add JARs from ndext to the JRE to get the same sort of "local JAR" behavior from previous versions. HCL "fixed" this by making it so that Designer adds all of the JARs in ndext to the compiling JRE, which sort of fixed the problem. It had the unfortunate side effect, though, of adding the various contaminants present in the Notes JVM to the classpath, particularly Poi and (in that post's case) the ancient Servlet spec.
This is a companion discussion topic for the original entry at https://frostillic.us/blog/posts/2026/2/4/quick-tip-stable-ndext-classpaths-in-designer-14-