Spring Boot + Hibernate + Hibernate Envers

Example Spring Boot + Hibernate + Hibernate Envers project for demonstration purposes of audit mechanism.

Getting started

To run application:

mvn package && java -jar target\company-structure-hibernate-history-1.0-SNAPSHOT.jar

Prerequisites:

• Java 8
• Maven
• H2/PostgreSQL

It is possible to run application in one of two profiles:

• h2
• postgres

depending on database engine chose for testing.

Testing database schema

Configuration

Separated database schema is configured to be used for audit:

spring.jpa.properties.org.hibernate.envers.default_schema=audit

Audited entities are annotated with @Audited.

@Entity
@Table(name = "COMPANY", uniqueConstraints = {@UniqueConstraint(columnNames = {"NAME"})})
@Audited
@Getter
@Setter
@EqualsAndHashCode(of = "id")
public class Company implements Serializable

Not audited entities need to be exluded from related entities. Since Car entity is not audited, it needs to be excluded from relationship like below:

@OneToMany(cascade = CascadeType.ALL, mappedBy = "company", fetch = FetchType.LAZY, orphanRemoval = true)
@JsonManagedReference
@NotAudited
private Set<Car> cars = new HashSet<>();

Implementation

Enhanced RevisionEntity:

@Entity
@RevisionEntity(AuditRevisionListener.class)
@Table(name = "REVINFO", schema = "audit")
@AttributeOverrides({
        @AttributeOverride(name = "timestamp", column = @Column(name = "REVTSTMP")),
        @AttributeOverride(name = "id", column = @Column(name = "REV"))})
@Getter
@Setter
public class AuditRevisionEntity extends DefaultRevisionEntity {

    @Column(name = "USERNAME", nullable = false)
    private String username;
}

Enhanced RevisionListener:

public class AuditRevisionListener implements RevisionListener {

    @Override
    public void newRevision(Object revisionEntity) {
        AuditRevisionEntity audit = (AuditRevisionEntity) revisionEntity;
        audit.setUsername("admin");
    }
}