Spring Integration 6.x to 7.0 Migration Guide

• New DistributedLock API
• Removal of deprecated classes from spring-integraiton-hazelcast
• Deprecated Junit 4 Based Components

New DistributedLock API

Spring Integration 7.0 introduces a DistributedLock abstraction with a Time-To-Live (TTL) API (for now), allowing lock objects in the target persistent store to be marked as expired if the instances holding the lock become unresponsive. This enables other instances to acquire the lock. With this new abstraction, the LockRegistry interface—along with its extensions and implementations—now accepts a generic argument to specify the Lock implementation provided by that particular LockRegistry. For example, the DefaultLockRegistry is now defined as:public final class DefaultLockRegistry implements LockRegistry<Lock>. Similarly, ZookeeperLockRegistry is now: public class ZookeeperLockRegistry implements ExpirableLockRegistry<Lock>. However, JdbcLockRegistry and RedisLockRegistry are now defined as:

implements ExpirableLockRegistry<DistributedLock>, RenewableLockRegistry<DistributedLock>

Therefore, the obtain() method in these registries now returns a DistributedLock instance, which includes the newly introduced lock(Duration ttl) and tryLock(Duration waitTime, Duration ttl) methods.

The RedisLockRegistry has supported TTL from the beginning via its default expireAfter property. However, with the addition of lock(Duration ttl), TTL can now be specified per lock usage.

The JdbcLockRegistry, being RDBMS-based, required changes to the SQL schema. A new EXPIRED_AFTER column has been added to the INT_LOCK table. As a result, for existing databases, the following DDL statement must be executed to properly migrate to Spring Integration 7.0:

ALTER TABLE INT_LOCK ADD EXPIRED_AFTER TIMESTAMP NOT NULL;

Removal of deprecated classes from spring-integraiton-hazelcast

Due to not supported anymore CP-subsystem in Open Source Hazelcast, so Spring Intergation classes were deprecated in 6.5 version. Now they are fully removed as out-dated API. More information in: Spring Integration 6.4 to 6.5 Migration Guide.

Deprecated Junit 4 Based Components

The classes in spring-integration-test-support module to support Junit 4 infrastructure, such as Log4j2LevelAdjuster, AbstractRequestResponseScenarioTests, LongRunningIntegrationTest and SingleRequestResponseScenarioTests, are now deprecated in favor of respective replacements for JUnit Jupiter. Their JavaDocs have references to replacements.