javers usage tutorial

This article presents Javers, an open-source Java library, enabling comprehensive and temporal auditing and versioning of entities in Java applications. It simplifies tracking changes to objects, offering historical versions and insights into data mo

How to use Javers to track entity changes in my Java application?

To use Javers for entity change tracking, follow these steps:

1. Add the Javers dependency to your project's pom.xml file:

<code class="xml"><dependency>
  <groupId>com.googlecode.javers</groupId>
  <artifactId>javers-core</artifactId>
  <version>6.2.3</version>
</dependency></code>

2. Define the domain objects that you want to track changes for.
3. Create a Javers instance:

<code class="java">Javers javers = JaversBuilder.javers().build();</code>

4. Register your domain objects with Javers:

<code class="java">javers.register(Author.class);
javers.register(Book.class);</code>

5. Create an Entity audit instance for the object you wish to track:

<code class="java">Book book = new Book("The Hitchhiker's Guide to the Galaxy", "Douglas Adams");
Entity audit = javers.commit("default", book);</code>

6. Make changes to the object and commit them to Javers:

<code class="java">book.setName("The Restaurant at the End of the Universe");
javers.commit("default", book);</code>

7. Retrieve the history of changes for the object:

<code class="java">List<Change> changes = javers.findChanges(JaversQuery.byInstance(book).build());</code>

What are the benefits of using Javers for auditing and versioning?

Using Javers for auditing and versioning offers several benefits:

• Comprehensive change tracking: Javers captures all changes made to your objects, including additions, deletions, modifications, and relationships.
• Temporal auditing: Javers provides a complete history of changes, allowing you to trace the evolution of your data over time.
• Support for multiple data stores: Javers can be integrated with various databases and frameworks, such as JPA, MongoDB, and Neo4j.
• Lightweight and efficient: Javers is a lightweight library that does not significantly impact your application's performance.

Can Javers be integrated with existing frameworks or databases?

Yes, Javers can be integrated with various frameworks and databases. Here are some examples:

• JPA: Javers can be integrated with JPA using the javers-persistence module.javers-persistence module.
• MongoDB: Javers can be integrated with MongoDB using the javers-mongo module.
• Neo4j: Javers can be integrated with Neo4j using the javers-neo4j

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