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If you have downloaded the 'dspace-src-release' (or checked out the latest DSpace Code via Subversion GitHub), there are two main build options that are available to you:

1. Full Build: Running mvn package from the root [dspace-source]directory
   
   • This option will rebuild all DSpace modules from their Java Source code, then apply any Maven WAR Overlays. In other words, all subdirectories of [dspace-source] are recompiled/rebuilt.
2. Quick Build: Running mvn package from the [dspace-source]/dspace/directory
   
   • This option performs a "quick build". It does not recompile/rebuild all DSpace modules. All it does is rebuild and re-apply any Maven WAR Overlays to the previously compiled source code. In other words, the ONLY code that will be recompiled/rebuilt is code that exists in [dspace-source]/dspace/modules/* (the Maven WAR Overlay directories)

Which build option you need to use will depend on your local development practices. If you have been careful to utilize Maven WAR Overlays for your local code/changes (putting everything under [dspace-source]/dspace/modules/*), then the Quick Build option may be the best way for you to recompile & reapply your local modifications. However, if you have made direct changes to code within a subdirectory of [dspace-source] (e.g. /dspace-api, /dspace-xmlui, /dspace-jspui, etc.) then you will need to utilize the Full Build option in order to ensure those modifications are included in the final WAR files.