feat: migrate OutboxStore from Exposed to plain JDBC (KOJAK-64)#26
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feat: migrate OutboxStore from Exposed to plain JDBC (KOJAK-64)#26
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Replace Exposed ORM with plain JDBC in PostgresOutboxStore and MysqlOutboxStore. This eliminates the coupling to Exposed's transaction mechanism, allowing okapi to work transparently with any Spring PlatformTransactionManager — JPA/Hibernate, JDBC, jOOQ, MyBatis, etc. Key changes: - Add ConnectionProvider interface to okapi-core - Add SpringConnectionProvider using DataSourceUtils.getConnection() - Rewrite PostgresOutboxStore and MysqlOutboxStore to plain JDBC - Remove Exposed dependencies from okapi-postgres and okapi-mysql - Delete OutboxTable.kt from both modules - Add TransactionRunner to OutboxPurger (fixes connection leak) - Fix null parameter handling (setNull instead of setTimestamp(null)) - Parameterize status in removeDeliveredBefore SQL - Change spring-jdbc from compileOnly to implementation
Move ExposedTransactionContextValidator out of okapi-core into a dedicated okapi-exposed module. Add ExposedConnectionProvider and ExposedTransactionRunner for Ktor/standalone Exposed apps. okapi-core is now free of Exposed dependencies — only plain JDK types.
ramafasa
reviewed
Apr 16, 2026
| * JPA, JDBC, jOOQ, MyBatis, Exposed, etc. | ||
| */ | ||
| class SpringConnectionProvider(private val dataSource: DataSource) : ConnectionProvider { | ||
| override fun getConnection(): Connection = DataSourceUtils.getConnection(dataSource) |
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Possible conection leak when called without an active Spring transaction>
DataSourceUtils.getConnection(ds) returns a transaction-bound connection when one exists, but otherwise fetches a fresh connection from the pool that the caller is contractually required to release via DataSourceUtils.releaseConnection(conn, ds)
ramafasa
approved these changes
Apr 16, 2026
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Summary
PostgresOutboxStoreandMysqlOutboxStorewith plain JDBC via newConnectionProviderfun interfaceSpringConnectionProvider(usesDataSourceUtils.getConnection()) for seamless Spring integration with anyPlatformTransactionManager(JPA, JDBC, jOOQ, MyBatis)OutboxTableExposed table definitions from both postgres and mysql modulesokapi-postgres,okapi-mysql, andokapi-spring-bootMotivation
Exposed as an internal implementation detail of OutboxStore forced consumers to:
compileOnlyin okapi leaked at runtime)SpringTransactionManagerinstead of standard Spring TMsJpaFlushingTransactionManagerfor JPA coexistenceWith
ConnectionProvider, okapi borrows the JDBC connection from whatever transaction mechanism the app uses — zero coupling.Key changes
okapi-coreConnectionProviderfun interfaceokapi-postgresPostgresOutboxStore(connectionProvider, clock)— pure JDBCokapi-mysqlMysqlOutboxStore(connectionProvider, clock)— pure JDBCokapi-spring-bootSpringConnectionProvider(dataSource)auto-configuredokapi-spring-bootOutboxPurgernow takes optionalTransactionRunnerokapi-integration-testsJdbcConnectionProvidertest helper, updated all testsValidated by
5 standalone example apps (JPA, JDBC, multi-datasource, jOOQ, Ktor+Exposed) — all passing JUnit tests and smoke tests against this branch.
Test plan
./gradlew test)