package javax.jnlp is declared in module java.jnlp, which is not in the module graph

Question

I have a project that uses Java webstart technology. I decided to upgrade the Java version from 8 to 9. However, I faced the following error on compiling:

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Answer 1

It looks like java.jnlp is not resolved by default for code on the class path (much like Java EE modules). The solution is to add it explicitly with --add-modules java.jnlp (both javac and java accepts that parameter).

This option is discussed in JEP 261: Module System or in this blog post.