Need Clarification on using cache along with JPA

Question

Hi,
I am using Oracle Coherence 3.5 and Jdeveloper 11g.
I have written a sample program which implements CacheStore which performs the following operations:
Insert, Update, Delete
Configured cache-config.xml file in whcih the element cachestore-scheme is used to invoke the corressponding class and the table name.
When I tried to run the cache using the JPA-Cache-server.bat I got the values accordingly. But each and every time the data is fetched from Database. I am using distributed-scheme in the configuration file. How do I configure the file such that for the first time the values comes form DB and then next time I get values from cache.
I used the same cache name in another program and tried to retrieve the values from cache but i got only null values:(
I will be very thank full to you if any one helps me on this.
Waiting for ur response..
Thanks,
Jagadeesh

Answer 1

I did not change any data in DB. I tried changing data in DB and then tested I got the updated content.
Below is my configuration file.
<cache-config>
<caching-scheme-mapping>
<cache-mapping>
<cache-name>Sample*</cache-name>
<scheme-name>distributed-db-backed</scheme-name>
</cache-mapping>
</caching-scheme-mapping>
<caching-schemes>
<distributed-scheme>
<scheme-name>distributed-db-backed</scheme-name>
<service-name>DistributedCache</service-name>
<backing-map-scheme>
<read-write-backing-map-scheme>
<internal-cache-scheme>
<class-scheme>
<class-name>com.tangosol.util.ObservableHashMap</class-name>
</class-scheme>
</internal-cache-scheme>
<cachestore-scheme>
<class-scheme>
<class-name>com.oracle.coherence.handson.cachest</class-name> <!-- Class where Cache store is implemented-->
<init-params>
<init-param>
<param-type>java.lang.String</param-type>
<param-value>filest</param-value> <!-- Table name-->
</init-param>
</init-params>
</class-scheme>
</cachestore-scheme>
<read-only>false</read-only>
<!--
To make this a write-through cache just change the value below to 0 (zero)
-->
<write-delay-seconds>0</write-delay-seconds>
</read-write-backing-map-scheme>
</backing-map-scheme>
<listener/>
<partition-count>100M</partition-count>
<autostart>true</autostart>
</distributed-scheme>
</caching-schemes>
</cache-config>
Thanks,
Jagadeesh