Question

I read through the documentation for ehcache 3 and its a bit confusing in the context of spring cache. My configuration is as follows:

 <?xml version="1.0" encoding="UTF-8"?> <ehcache:config updateCheck="true" monitoring="autodetect" dynamicConfig="true" xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:ehcache='http://www.ehcache.org/v3' xmlns:jsr107='http://www.ehcache.org/v3/jsr107' xsi:schemaLocation=" http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.1.xsd"> <ehcache:annotation-driven /> <ehcache:service> <service> <jsr107:defaults enable-management="true" enable-statistics="true"/> </service> </ehcache:service> <ehcache:cache alias="xyz" statistics="true"> <ehcache:key-type>java.lang.Long</ehcache:key-type> <ehcache:value-type>abcsomething</ehcache:value-type> <ehcache:expiry> <ehcache:ttl unit="seconds">10</ehcache:ttl> </ehcache:expiry> <ehcache:resources> <ehcache:heap unit="entries">10000</ehcache:heap> <ehcache:offheap unit="MB">1</ehcache:offheap> </ehcache:resources> <jsr107:mbeans enable-statistics="true"/> </ehcache:cache> ... </ehcache:config> 

  cache: jcache: config: classpath*:ehcache.xml 

My yaml:

  cache: jcache: config: classpath*:ehcache.xml 

A bit lost as to what I should be looking for - I thought org.ehcache can be profiled and would show up. I dont see anything with that pattern in jvisualvm. Or not sure how to read the information. Used to be straightforward in ehcache 2.x Any help would be appreciated. I would like to get the size and count of the cache. Number of elements currently in the cache etc.

Answer 1

To be sure how to answer would need the spring configuration and some Java code. However, your current ehcache.xml seems a weird medley of Ehcache 2 and 3. And the yaml is wrong.

So, in order, you need a pom.xml including JSR-107

    <dependency>
        <groupId>javax.cache</groupId>
        <artifactId>cache-api</artifactId>
    </dependency>

    <dependency>
        <groupId>org.ehcache</groupId>
        <artifactId>ehcache</artifactId>
        <version>3.4.0</version>
    </dependency>

The, the application.yml should have a spring prefix.

spring:
  cache:
    jcache:
      config: classpath:ehcache.xml

For the cache to be enabled, you need something like @EnableCaching or <cache:annotation-driven/> which should be in the Spring configuration, not in the ehcache.xml .

Finally, I've cleaned up everything that shouldn't be in the ehcache.xml . I'm also using a default namespace to make it more readable. Also, since Spring caches are untyped, you need to remove the key-type and value-type from the cache configuration.

<?xml version="1.0" encoding="UTF-8"?>
<config xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
                xmlns='http://www.ehcache.org/v3'
                xmlns:jsr107='http://www.ehcache.org/v3/jsr107'
                xsi:schemaLocation="
  http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd
  http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.1.xsd">

  <service>
      <jsr107:defaults enable-management="true" enable-statistics="true"/>
  </service>

  <cache alias="xyz">
    <expiry>
      <ttl unit="seconds">10</ttl>
    </expiry>
    <resources>
      <heap unit="entries">10000</heap>
      <offheap unit="MB">1</offheap>
    </resources>
    <jsr107:mbeans enable-statistics="true"/>
  </cache>

</config>