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1. Download DSpace 4.0: Either download DSpace 4.0 from DSpace.org or check it out directly from the Github repository. If you downloaded DSpace do not unpack it on top of your existing installation. Refer to Installation Instructions, Step 3 for unpacking directives.
2. Merge any customizations (if needed).  If you have made any local customizations to your DSpace installation they may need to be migrated over to the new DSpace. For minor upgrades, there are often fewer changes, but it is still worth checking to see if any effect your customizations. Customizations are typically housed in one of the following places:
   
   • JSPUI modifications: [dspace-source]/dspace/modules/jspui/src/main/webapp/
   • XMLUI modifications: [dspace-source]/dspace/modules/xmlui/src/main/webapp/
   • Config modifications: [dspace]/config
3. Edi t the build.properties file (if needed) ([dspace-source]/build.properties).  Any settings changed in this build.properties file are automatically copied over to the final dspace.cfg file during the "Build DSpace" process (in the next step).  For more information on the build.properties file, see "The build.properties Configuration Properties File" section of the Configuration Reference documentation.

4. Build DSpace. Run the following commands to compile DSpace:

   Code Block
   cd [dspace-source]/dspace/ mvn -U clean package

   You will find the result in [dspace-source]/dspace/target/dspace-[version]-build.dir . Inside this directory is the compiled binary distribution of DSpace. Before rebuilding DSpace ('package'), the above command will clean out any previously compiled code ('clean') and ensure that your local DSpace JAR files are updated from the remote maven repository.

5. Stop Tomcat. Take down your servlet container. For Tomcat, use the $CATALINA_HOME/shutdown.sh script. (Many Unix-based installations will have a startup/shutdown script in the /etc/init.d or /etc/rc.d directories.)
6. Update DSpace.
   

   1. Update the DSpace installed directory with the new code and libraries. Issue the following commands:

      Code Block
      cd [dspace-source]/dspace/target/dspace-[version]-build.dir ant update

   2. The database schema has changed in 4.0.  So, you will need to update your existing DSpace 3.x database. Please run one of the following scripts to update your database:
      
      • PostgreSQL: [dspace-source]/dspace/etc/postgres/database_schema_3-4.sql
      • Oracle: [dspace-source]/dspace/etc/oracle/database_schema_3-4.sql
7. Update your DSpace Configurations. You should review your configuration for new and changed configurations in DSpace 4.0.   TBS: how to.

   Refresh Browse and Search Indexes. It is a good policy to rebuild your search and browse indexes when upgrading to a new release.  To do this, run the following command from your DSpace install directory (as the dspace user):

   Code Block
   [dspace]/bin/dspace index-init

   Refresh Discovery: If you are using Discovery (Solr) for search/browse, you will also need to refresh Discovery indexes by running the following command:

   code

   [dspace]/bin/dspace index-discovery -f

8. Deploy Web Applications. If necessary, copy the web applications files from your [dspace]/webapps directory to the subdirectory of your servlet container (e.g. Tomcat):

   Code Block
   cp -R [dspace]/webapps/* [tomcat]/webapps/

   See the installation guide for full details.

9. Restart servlet container. Now restart your Tomcat/Jetty/Resin server program and test out the upgrade.

10. Upgrade Solr Indexes. After upgrading DSpace, you should optimize your Solr indexes to ensure that they are in the current format.  Solr can upgrade recent formats to its current one.  Doing this whenever you upgrade DSpace should keep the index formats current.  You can optimize your indexes with a command line tool such as <code>wget</code>:

    Code Block
    language bash title Optimizing Solr indexes
    wget http://www.example.com/solr/<core>/update?optimize=true

     

    If you have been through several DSpace upgrades and have not done this, there is a chance that your indexes are in a format too old for the most recent Solr to convert:

    Info
    title Format error
    Caused by: org.apache.lucene.index.IndexFormatTooOldException: Format version is not supported (resource: segment _386q in resource ChecksumIndexInput(MMapIndexInput(path="/space/dspace/solr/statistics/data/index/segments_37m6"))): 2.x. This version of Lucene only supports indexes created with release 3.0 and later.

    You may be able to use your older DSpace installation before upgrading it, to upgrade your indexes enough that a second optimization after upgrading DSpace will succeed.  You can also use an external tool with its own version of the required libraries, such as Luke.  You will need a version of Lucene (the indexing library used by Solr) which can convert the earlier version into the later one.  So, for example, you could use the Solr webapp. in DSpace 1.8.x or 3.x, or Luke 3.5, to upgrade version 2 indexes to version 3.  Once you have version 3 index files, you should be able to upgrade to DSpace 4.x, and the next optimization you do will upgrade the indexes again to version 4.

11. Refresh Browse and Search Indexes. DSpace 4 relies on SOLR based Discovery for both search and browse purposes. To update the Discovery indexes, run the following command from your DSpace install directory as the dspace user.

    Code Block
    [dspace]/bin/dspace index-discovery -f