The configuration of the DataSourceProvider should be defined only if you use managed data sources since by default all the data sources are considered as not managed. See below the default configuration

<configuration>
....  
   <component>
      <key>org.exoplatform.services.jdbc.DataSourceProvider</key>
      <type>org.exoplatform.services.jdbc.impl.DataSourceProviderImpl</type>
      <init-params>
         <!--  Indicates that the data source needs to check if a tx is active
              to decide if the provided connection needs to be managed or not.
              If it is set to false, the data source will provide only
              managed connections if the data source itself is managed.  -->
         <!--value-param>
            <name>check-tx-active</name>
            <value>true</value>
         </value-param-->
         <!-- Indicates that all the data sources are managed 
              If set to true the parameter never-managed and 
              managed-data-sources will be ignored -->
         <!--value-param>
            <name>always-managed</name>
            <value>true</value>
         </value-param-->
         <!-- Indicates the list of all the data sources that are 
              managed, each value tag can contain a list of
              data source names separated by a comma, in the
              example below we will register ds-foo1, ds-foo2 
              and ds-foo3 as managed data source. If always-managed
              and/or never-managed is set true this parameter is ignored -->
         <!--values-param>
            <name>managed-data-sources</name>
            <value>ds-foo1, ds-foo2</value>
            <value>ds-foo3</value>
         </values-param-->
      </init-params>
   </component>  
...
</configuration>