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DOI support is disabled by default. So even with our code your have to configure DSpace to use it. In dspace.cfg you'll have to configure the properties identifier.doi.user, identifier.doi.password, identifier.doi.prefix and identifier.doi.namespaceseparator. The namespaceseparator will be prefixed to every suffix DSpace generates. If you use 10.0128 as prefix, "abc-" as namespaceseparator the DOIs generated by DSpace will look like 10.0128/abc-1, 10.0128/abc-2, ..., 10.0128/abc-1024, ... The namespace separator is usefull if different software or multiple DSpace installations use the same prefix. For testing please use something you think it's unique as namespace separator (f.e. your name, your login, ...). In dspace.cfg you have to remove the comments from event.consumer.doi class and event.consumer.doi.filters and add doi to event.dispatcher.default.consumers. The second file you have to configure is dspace/config/spring/api/identifier-service.xml. In this file you have to remove to comments around the bean for the DOIIdentifier and around the bean for the DataCiteConnector. The properties for the DataCiteConnector has to be set as following:
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