Apache OpenEJB and Apache TomEE are born from the same project and community. They differ in two major ways, only one of them technical:
- TomEE incorporates two additional projects; Tomcat and MyFaces
- TomEE, as a name, more easily implies the breadth of technologies included
Effectively, TomEE is a superset of OpenEJB. They share the same code and TomEE grew out of OpenEJB.
Note: this table is for TomEE 1.x, TomEE 7 comments are under it.
| Tomcat | TomEE | TomEE JAX-RS (~ Microprofile) | TomEE+ | TomEE PluME | OpenEJB | |
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| Java Servlets |  |
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| Java ServerPages (JSP) | |
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| Java ServerFaces (JSF) | |
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| Java Transaction API (JTA) | |
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| Java Persistence API (JPA) | |
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| Java Contexts and Dependency Injection (CDI) | |
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| Java Authentication and Authorization Service (JAAS) | |
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| Java Authorization Contract for Containers (JACC) | |
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| JavaMail API | |
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| Bean Validation | |
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| Enterprise JavaBeans | |
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| Java API for RESTful Web Services (JAX-RS) | |
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| Java API for XML Web Services (JAX-WS) | |
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| Java EE Connector Architecture | |
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| Java Messaging Service (JMS) | |
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| EclipseLink | |
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| Mojarra | |
TomEE 7 targets JavaEE 7 and implements these specifications (in parenthesis the distibution(s) containing it if not part of the basic packages):
- WebSocket JSR 356
- JSON-P JSR 353
- Servlet 3.1 JSR 340
- JSF 2.2 JSR 344
- EL 3.0 JSR 341
- JSP 2.3 JSR 245
- JSTL 1.2 JSR 52
- JBatch (plus) JSR 352
- Concurrency utilities for EE JSR 236
- CDI 1.2, DI, Interceptors 1.2, Common Annotations JSR 346 + JSR 330 + JSR 318 + JSR 250
- Bean Validation 1.1 JSR 349
- EJB 3.2 JSR 345
- JavaEE Connector JSR 322
- JPA 2.1 JSR 338 (WARNING: openjpa based distributions provide a JPA 2.0 runtime)
- JMS 2.0 JSR 343 (layer based on ActiveMQ 5 / JMS 1.1 for default distributions)
- JTA 1.2 JSR 907
- Javamail 1.4 (NOTE: EE 7 requires 1.5)
- JAX-RS 2.0 JSR 339
- JAX-WS 2.2 JSR 224
- JAXB 2.2 JSR 222
- and more inherited from TomEE 1/JavaEE 6