8370334: javadoc NPE with "import module" statement

[lahodaj]

Modules.enter completes all root modules, but in case of additional modules being added to the module graph via Modules.addExtraAddModules (either from javadoc, or using the CompilationTask.addModules, these extra modules may not be completed at this time. Normally, they are completed eventually, but if their module-infos contain import module, an NPE will appear while checking the import, before the complete happens.

The proposal herein is to consistently complete all modules in the module graph when the module graphs is setup.

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 ⚠️ Found leading lowercase letter in issue title for 8370334: javadoc NPE with "import module" statement

Issue

• JDK-8370334: javadoc NPE with "import module" statement (Bug - P4)

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