TTL Expiry configuration in ehcache.xml is not working for Ehcache3

[Chaitanya Gondela]

1. What version of Ehcache you are currently using;
2. Paste the configuration for the Cache/CacheManager you have an issue with;
3. Add any name and version of other library or framework you use Ehcache with (e.g. Hibernate);
4. Providing JDK and OS versions maybe useful as well.

I'm using Ehcache 3.5.2 with Spring boot to save a list of users in cache. My intention is to flush out specific cache based upon expiry which we set. 

<config xmlns='http://www.ehcache.org/v3'

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:jsr107="http://www.ehcache.org/v3/jsr107"

xsi:schemaLocation="http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd

http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd">

<cache alias="usersCache">

<key-type>java.lang.String</key-type>

<value-type>com.example.demo.modal.Users</value-type>

<expiry>

<ttl unit="seconds">60</ttl>

    </expiry>

<jsr107:mbeans enable-statistics="true"/>

</cache>

</config>

cache is not expiring after 60 seconds. I'm, using Spring Data JPA version 2.0.3.

[Henri Tremblay]

This is a bit surprising.

Can you give us the java code as well? If it Spring Cache or Hibernate Cache?

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[Chaitanya Gondela]

This is the java code to retrieve from if exists.

package com.example.demo.cache;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.cache.annotation.Cacheable;

import org.springframework.stereotype.Component;

import com.example.demo.modal.Users;

import com.example.demo.repository.UsersRepository;

@Component

public class UsersCache {

@Autowired

private UsersRepository usersRepository;

@Cacheable(value = "usersCache", key = "#name")

public Users getUser(String name) {

System.out.println("Retreving from database for name" + name);

return usersRepository.findByName(name);

[Chaitanya Gondela]

This is the java code to retrieve from cache if exists.

[Henri Tremblay]

You are not using Ehcache. You just think you are.

The current ehcache.xml used isn't complete so should fail.

To have Ehcache to work in Spring Boot, you need 2 things:

• Specify an ehcache.xml in the application.properties: 

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

• Add a dependency to JSR107
  

<dependency>
 <groupId>javax.cache</groupId>
 <artifactId>cache-api</artifactId>
 <version>1.1.0</version>
 <scope>runtime</scope>
</dependency>

Without these two things, Spring Boot won't understand that you want to use Ehcache. So it will use the default cache.

Once this is done, you will see Ehcache fail because you haven't specified a resource pool on your cache. You need something like this:

<cache alias="usersCache">

  <key-type>java.lang.String</key-type>

  <value-type>com.example.demo.modal.Users</value-type>

  <expiry>

  <ttl unit="seconds">60</ttl>

  </expiry>

  <heap unit="entries">2000</heap>

  <jsr107:mbeans enable-statistics="true"/>

  </cache>

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[Chaitanya Gondela]

I already added the config key-value pair in application.properties

Apart from that, I added the dependency you specified and resource pool in ehcache.xml

I tried again but still facing the same issue. Cache is NOT expiring after specified TTL (I tried with 6 seconds).

Below are the dependencies added in pom.xml

<dependencies>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-cache</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-data-jpa</artifactId>

</dependency>

<dependency>

<groupId>com.h2database</groupId>

<artifactId>h2</artifactId>

<scope>runtime</scope>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-test</artifactId>

<scope>test</scope>

</dependency>

<dependency>

<groupId>javax.cache</groupId>

<artifactId>cache-api</artifactId>

<version>1.1.0</version>

  <scope>runtime</scope>

</dependency>

</dependencies>

[Chaitanya Gondela]

Can someone help on this? 

Henri, still I'm facing the issue.

[Henri Tremblay]

My current guess is caching as well.

Try to log in debug to see what is happening.

One thing is sure, Ehcache works perfectly in this case. You can debug in the get() call to see which cache is used and why it doesn't expire.

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[Chaitanya Gondela]

Thanks for your reply.

Yes, it seems NOT using Ehcache. When I was debugging I'm not find anything but when I enable the Ehcache logs using below property, I'm not seeing anything like cache created or record inserted in the cache.

I think we should see something like that right.

Added below property in application.properties to enable ehcache logs.

logging.level.org.ehcache=info

As I'm new to the Ehcache not able to find more details. Maybe if you want I can share the code here if you want to see the actual issue.

[Chaitanya Gondela]

https://github.com/gchaitu795/Ehcache3

Above is the GitHub where I committed the sample code which I was trying.

[Henri Tremblay]

You should have started by that.

So... the problem is exactly what I said in first place. You are not using Ehcache. Your current Spring CacheManager is ConcurrentMapCacheManager. (easy to check by doing

@Autowired
private CacheManager cacheManager;

somewhere and looking at the implementation in debug.

Then, I said you need JSR107 in your classpath. It was commented in the pom.xml. If I uncomment it, it starts using Ehcache through JSR107 as expected.

Then it fails because of the wrong path to ehcache.xml. It should be 

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

And now it works and expires as expected.

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[Chaitanya Gondela]

Thank you. It's working now.