DataNucleus supports persistence to heterogeneous datastores and this plugin provides persistence to Excel.
'org.datanucleus:datanucleus-excel:1.0.3'
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-excel</artifactId>
<version>1.0.3</version>
</dependency>
<dependency org="org.datanucleus" name="datanucleus-excel" rev="1.0.3"/>
"org.datanucleus", "datanucleus-excel", "1.0.3"