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Java 9 removes access to various unsupported JDK-internal APIs by default.
Examine the use of unsupported JDK-internal APIs and consider replacing them with supported APIs as recommended in the references.
Oracle JDK Documentation: Oracle JDK 9 Migration Guide.
OpenJDK Documentation: Java Dependency Analysis Tool, JEP 260: Encapsulate Most Internal APIs, JEP 261: Module System.