Default methods in StandardJavaFileManager contain "Impl Requirements" spec block, for example:

https://docs.oracle.com/en/java/javase/16/docs/api/java.compiler/javax/tools/StandardJavaFileManager.html#asPath(javax.tools.FileObject)

This block is missed for https://docs.oracle.com/en/java/javase/16/docs/api/java.compiler/javax/tools/StandardJavaFileManager.html#setLocationForModule(javax.tools.JavaFileManager.Location,java.lang.String,java.util.Collection)

Spec for setLocationForModule should contain

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Implementation Requirements:
    The default implementation throws UnsupportedOperationException
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