Exposed VS Ebean ORM

• Kotlin-idiomatic API
  Exposed is written in Kotlin and offers a type-safe DSL and a DAO API that feel natural to Kotlin developers. Queries are checked at compile time, which reduces runtime errors compared to raw SQL strings.
• Two flexible abstraction levels
  Developers can choose between the lightweight SQL DSL, which stays close to SQL, and the DAO API, which maps tables to entities. Both can be mixed in the same project, so teams can pick the right level of abstraction for each use case.
• Multi-database support
  Exposed supports many relational databases, including H2, MySQL, MariaDB, PostgreSQL, Oracle, and SQL Server (SQLite is also supported). Switching databases or supporting several of them requires few code changes.
• Lightweight with low learning curve
  Compared to heavyweight ORMs such as Hibernate, Exposed has a small footprint and less hidden magic like lazy-loading proxies or complex session management. Its behavior is easier to reason about, and setup is simple.
• Good ecosystem integration and backing
  It is developed and maintained by JetBrains and integrates well with Ktor, Spring, and Kotlin coroutines (including R2DBC support in newer versions). It also supports Kotlin features like date-time types, JSON columns, and encryption through extension modules.

Possible disadvantages

• Kotlin/JVM only
  Exposed can only be used with Kotlin on the JVM, so it is not an option for Java-only teams that don't want to adopt Kotlin, and it can't be shared across non-JVM platforms.
• Limited advanced ORM features
  Compared to mature ORMs such as Hibernate, Exposed has fewer features such as sophisticated caching, complex inheritance mapping, and automatic change tracking. Complex relationships may need manual handling.
• Basic schema migration support
  Exposed can create and alter tables, but its built-in migration tooling is limited and not a full replacement for tools like Flyway or Liquibase. Production projects typically need to add a dedicated migration tool.
• Pre-1.0 API changes and smaller community
  For a long time Exposed was versioned below 1.0, with breaking changes between releases. Its community, tutorials, and third-party resources are smaller than for Hibernate or jOOQ, so finding answers for edge cases can be harder.
• Concurrency and performance pitfalls
  Exposed is built on JDBC, which is blocking, so using it with coroutines requires care with transactions and dispatchers. The DAO layer can also produce N+1 query problems unless eager loading is used explicitly.

• Simplified ORM
  Ebean ORM simplifies database interactions with an easy-to-use API, which abstracts away much of the complexity involved in handling SQL directly. This allows developers to focus more on business logic rather than database connectivity and queries.
• Automatic Query Generation
  Ebean automatically generates queries based on the defined entity models, reducing the need for manually crafting complex SQL queries. This feature can save development time and reduce the potential for query-related errors.
• Lazy Loading Support
  Ebean supports lazy loading, which allows for the efficient retrieval of data by only loading related entities when they are accessed. This can help improve application performance by reducing initial data loading times.
• Integration with Play Framework
  Ebean integrates seamlessly with the Play Framework, which is advantageous if you are developing applications using this framework, providing a cohesive development experience and reducing setup complexity.
• Full-text Search
  Ebean provides built-in support for full-text search, enabling applications to perform search operations without relying on external search services, thus offering more versatility in how data can be queried and manipulated.

Possible disadvantages

• Limited Ecosystem
  Compared to more established ORMs like Hibernate, Ebean has a smaller community and ecosystem, which may result in less third-party support, fewer tutorials, and less available expertise, potentially increasing the learning curve for new developers.
• Documentation
  While Ebean offers documentation, some users might find it lacking in depth compared to larger projects, which can make troubleshooting and advanced use cases more challenging to navigate without external help or experimentation.
• Resource Intensive
  Ebean can be resource-intensive in terms of memory and processing, especially in cases of complex data models or when dealing with extremely large datasets, which might impact application performance and scalability.
• Lack of Advanced Features
  For highly specialized and advanced ORM tasks, Ebean might lack some of the features offered by more mature ORMs like Hibernate, which could necessitate additional work or integration with other tools for complex requirements.

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Ebean ORM - fetch join @OneToMany maxRows treatment

Tracking Exposed since Oct 2026.

• How do you guys go about the persistence layer?

  You can have a look at https://ebean.io/ ... Better control over the generated SQL, multiple levels of abstraction, can generate DB migrations and run the DB migrations, transparent encryption support, SQL 2011 history support, test... Source: over 4 years ago

• What do you whish for Spring 6?

  There is https://ebean.io/ and looks like it a community driven alternative to jOOQ. Source: about 5 years ago

• Do you use code generators in your IDEs or some external ones? If so, which ones?

  Ebean ORM https://ebean.io/ was built to somewhat rival JPA (and JDBI) Btw: you can use java 16 records with ebean as DTOs, EmbeddedId and also as read only entity beans (and JPA implementations could similarly do so). Source: about 5 years ago

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