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Integrating with Apache Geronimo:

Apache Geronimo V2.0.2 through 2.1.3 include OpenJPA 1.0.x and you can simply deploy an enterprise archive, web archive, or EJB-JAR that contains a persistence unit.
Apache Geronimo V2.1.4 includes OpenJPA 1.2.x and you can simply deploy an enterprise archive, web archive, or EJB-JAR that contains a persistence unit.

Integrating with GlassFish:

Since GlassFish implements the Java Persistence API 1.0 SPI, it is very easy to use OpenJPA in Glassfish. See Sahoo's blog for further details.

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Since Sun Java System Application Server is based on code from the GlassFish project, the instructions to use OpenJPA in GlassFish and Sun Java System Application Server remain the same.

Integrating with IBM WebSphere Application Server

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See IBM WebSphere Developer Technical Journal: Leveraging OpenJPA with WebSphere Application Server V6.1.
Also, WebSphere Application Server V6.1 can download and install the EJB3 Feature Pack, which includes OpenJPA 1.0.x.
WebSphere Application Server V7.0 includes OpenJPA 1.2.x and you can simply deploy an enterprise archive, web archive, or EJB-JAR that contains a persistence unit.

Integrating with IBM WebSphere Application Server Community Edition:

WebSphere Application Server Community Edition V2.0.0.2 through 2.1.1.1 include OpenJPA 1.0.x and you can simply deploy an enterprise archive, web archive, or EJB-JAR that contains a persistence unit.
WebSphere Application Server Community Edition V2.1.x releases after V2.1.1.1 will include OpenJPA 1.2.x and you can simply deploy an enterprise archive, web archive, or EJB-JAR that contains a persistence unit.

Integrating with JOnAS Application Server V 4.X (J2EE 1.4 / EJB2.1 Container):

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