Spring Data + Hibernate Query Caching not working

Question

I am trying but not succeeding to cache a query in Spring Data and Hibernate environmet with following dependencies :

Answer 1

<cache:annotation-driven /> in jpa-context.xml was missing, adding which fixes the problem . The final jpa-context.xml is

<?xml version="1.0" encoding="UTF-8"?>
<beans
    xmlns:p="http://www.springframework.org/schema/p" 
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:cache="http://www.springframework.org/schema/cache" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd  
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/cache
        http://www.springframework.org/schema/cache/spring-cache.xsd"
    default-autowire="byName">

    <tx:annotation-driven />
    <cache:annotation-driven />

    <bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager">
      <property name="caches">
         <set>
          <bean class="org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean" p:name="merchantServices"/>
        </set>
      </property>
    </bean>
</beans>

I also added resources/ehcache.xml.

<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd">

<diskStore path="/home/prayag/cache_"/>
<defaultCache
        eternal="false"
        maxElementsInMemory="1000"
        overflowToDisk="true"
        diskPersistent="true"
        timeToLiveSeconds="300"
        />
</ehcache>

Which is referenced as <property name="hibernate.cache.provider_configuration_file_resource_path">ehcache.xml</property> in resources/hibernate.cfg.xml.

My CPU cache conf is

prayag@prayag:~/hacker_/draobkcalb$ sudo dmidecode -t cache
[sudo] password for prayag: 
# dmidecode 2.11
SMBIOS 2.5 present.

Handle 0x000A, DMI type 7, 19 bytes
Cache Information
    Socket Designation: Internal Cache
    Configuration: Enabled, Not Socketed, Level 1
    Operational Mode: Write Back
    Location: Internal
    Installed Size: 32 kB
    Maximum Size: 32 kB
    Supported SRAM Types:
        Synchronous
    Installed SRAM Type: Synchronous
    Speed: Unknown
    Error Correction Type: Unknown
    System Type: Unknown
    Associativity: Unknown

Handle 0x000B, DMI type 7, 19 bytes
Cache Information
    Socket Designation: External Cache
    Configuration: Enabled, Not Socketed, Level 2
    Operational Mode: Write Back
    Location: External
    Installed Size: 2048 kB
    Maximum Size: 2048 kB
    Supported SRAM Types:
        Synchronous
    Installed SRAM Type: Synchronous
    Speed: Unknown
    Error Correction Type: Unknown
    System Type: Unknown
    Associativity: Unknown