Add example for Hibernate second level caching #254
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Summary of Changes
Hello @rashidi, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request introduces a new example project focused on demonstrating how to implement and configure Hibernate's second-level caching within a Spring Data JPA application. The primary goal is to provide a clear, runnable example that illustrates how entity data can be cached to reduce database load and improve application performance, particularly for frequently accessed, less volatile data.
Highlights
- New Example Module: Added a new Spring Boot module
data-jpa-hibernate-cacheto demonstrate Hibernate's second-level caching capabilities. - Hibernate Caching Configuration: Configured Hibernate to use JCache with Ehcache as the caching provider through
application.propertiesand a dedicatedehcache.xmlfile. - Entity Caching: The
Customerentity has been annotated with@Cache(usage = READ_WRITE, region = "customer")to enable second-level caching for customer data, optimizing subsequent retrievals. - Caching Verification Test: Included a new test case (
CustomerRepositoryTests) that verifies theCustomerentity is correctly stored in the Hibernate second-level cache after its initial retrieval, usingEntityManagerFactory.getCache().contains(). - Testcontainers Integration: Set up Testcontainers for PostgreSQL in the test environment, providing a clean and isolated database instance for reliable testing of the caching mechanism.
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Code Review
This pull request introduces a well-structured example for demonstrating Hibernate's second-level caching with Ehcache and Testcontainers. The overall implementation is solid. I've provided a few suggestions to enhance it further, focusing on using up-to-date configuration properties, improving the entity design for robustness, making tests more stable and comprehensive, and adhering to common file formatting conventions.
| spring.jpa.properties.hibernate.javax.cache.uri=/ehcache.xml | ||
| spring.jpa.properties.hibernate.javax.cache.provider=org.ehcache.jsr107.EhcacheCachingProvider |
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With Spring Boot 3 and Hibernate 6, the JCache configuration properties have been updated to move away from the javax.* namespace. While the old properties might be supported for backward compatibility, it is best practice to use the current hibernate.cache.jcache.* properties to ensure future compatibility.
spring.jpa.properties.hibernate.cache.jcache.uri=/ehcache.xml
spring.jpa.properties.hibernate.cache.jcache.provider=org.ehcache.jsr107.EhcacheCachingProvider
| */ | ||
| @Entity | ||
| @Cache(usage = READ_WRITE, region = "customer") | ||
| class Customer { |
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For a JPA entity, it's highly recommended to include:
- Getters and setters for its properties.
- A proper implementation of
equals()andhashCode(), typically based on the business key or primary key.
While JPA can work with field access, providing these methods improves maintainability, testability, and helps avoid potential issues with detached entities and their behavior in collections.
...nate-cache/src/test/java/zin/rashidi/datajpa/hibernatecache/TestcontainersConfiguration.java
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...cache/src/test/java/zin/rashidi/datajpa/hibernatecache/customer/CustomerRepositoryTests.java
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...cache/src/test/java/zin/rashidi/datajpa/hibernatecache/customer/CustomerRepositoryTests.java
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