Returning a runtime type loaded from an archive in a module system

A system, comprising:

• at least one hardware processor including a process;
• and
• the system configured to perform operations comprising:
• identifying, by a class loader implemented in a first runtime environment, an archived runtime type loaded into an archive from a module source;
• identifying a particular package associated with the archived runtime type;
• determining whether the particular package is defined to any runtime module, of a module system, that is defined to (i) the class loader or (ii) any class loader in a class loader hierarchy to which the class loader delegates, in the first runtime environment;
• responsive at least to determining that the particular package is defined to a runtime module that is defined to (i) the class loader or (ii) any class loader in the class loader hierarchy to which the class loader delegates, in the first runtime environment:
• returning directly or indirectly, by the class loader, a runtime type loaded based on the archived runtime type from the archive;
• and
• wherein runtime type visibility is enforced by the module system based at least in part on readability of one or more runtime modules as defined in the module system.

A non-transitory computer readable medium comprising instructions which, when executed by one or more hardware processors, cause performance of operations comprising:

• identifying, by a class loader implemented in a runtime environment, an archived runtime type loaded into an archive from a namespace;
• determining whether the archived runtime type is associated with any package that is defined to any runtime module, of a module system, that is defined to (i) the class loader or (ii) any class loader in a class loader hierarchy to which the class loader delegates;
• and
• responsive at least to determining that the archived runtime type is not associated with any package that is defined to any runtime module that is defined to (i) the class loader or (ii) any class loader in the class loader hierarchy to which the class loader delegates:
• returning directly or indirectly, by the class loader, a runtime type loaded based on the archived runtime type from the archive;
• and
• wherein runtime type visibility is enforced by the module system based at least in part on readability of one or more runtime modules as defined in the module system.