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Move all projects from classpath to module path at once, when working with top down migration,why?

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Im studying for 1Z0-819 certificate and I saw that you must movel all projects from classpath to module path at once, please tell me if i got it right why.

The reason is, named modules cannot access unnamed modules.Using top down strategy, all projects that are not named modules(high-level) are automatic modules(low-level), cause named can access automatic modules. In this scenario, if the automatic modules(low-level) were unnamed, high-level modules that reference this low-level module, would have problems since the named module cannot access unnamed.

Working with bottom up, you dont need move everything at once, cause the projects that have been migrated are named modules(low-level) and the projects that have not been migrated are unnamed modules(high-level).In this scenario, high-level projects are unnamed modules and they can access your dependencies that are named modules already migrated.

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