In the GeoServer installation package, the default is not to publish data in the Oracle database, can only publish PostGIS, SHP and other data, details such as:
If you want to publish Oracle data and install the appropriate version of the plugin for the Oracle data source, the native GeoServer version is 2.6.1, then download the corresponding version of Oracle plugin.
: http://geoserver.org/release/stable/(This address remains geoserver the latest version)
Download the corresponding data source plugin: http://sourceforge.net/projects/geoserver/files/GeoServer/2.6.1/extensions/ Geoserver-2.6.1-oracle-plugin.zip/download
Extract: Geoserver-2.6.1-oracle-plugin.zip file, JDBC Driver and geoserver for Oracle plug-in,
Put these two jar packages into the Lib folder "GeoServer 2.6.1\webapps\geoserver\web-inf\lib" of the GeoServer installation directory, restart GeoServer, and you can see that the data source will be:
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GeoServer Publishing Oracle Data