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http://wiki.eclipse.org/EclipseLink/FAQ/JPA
What version of JPA does EclipseLink support? EclipseLink fully supports JPA 2.0, in fact, EclipseLink is the JPA 2.0 reference implementation. EclipseLink can also be used the Java EE servers that only support JPA 1.0. EclipeLink 2.4 also supports some aspects of the JPA 2.1 draft. What features beyond JPA does EclipseLink support?
https://www.eclipse.org/eclipselink/
MOXy XML or JSON. The EclipseLink MOXy component enables Java developers to efficiently bind Java classes to XML or JSON. MOXy implements JAXB as well as SDO standards allowing developers to provide their mapping information through annotations as well as providing support for storing the mappings in XML format.
https://www.eclipse.org/eclipselink/documentation/2.5/concepts/app_tl_ext001.htm
24 rows · Database Support. EclipseLink supports any relational database that is compliant with SQL …
https://java-persistence-performance.blogspot.com/2012/04/eclipselink-jpa-supports-mongodb.html
Apr 02, 2012 · Couch DB; EclipseLink's NoSQL support allows the JPA API and JPA annotations/xml to be used with NoSQL data. EclipseLink also supports several NoSQL specific annotations/xml including @NoSQL that defines a class to map NoSQL data. EclipseLink's NoSQL support is based on previous EIS support offered since EclipseLink 1.0.
https://wiki.eclipse.org/EclipseLink/Examples/JPA/NoSQL
EclipseLink's NoSQL support is based on previous EIS support offered since EclipseLink 1.0. EclipseLink's EIS support allowed persisting objects to legacy and non-relational databases. EclipseLink's EIS and NoSQL support uses the Java Connector Architecture (JCA) to access the data-source similar to how EclipseLink's relational support uses ...
https://thoughts-on-java.org/difference-jpa-hibernate-eclipselink/
When people are new to JPA, Hibernate or EclipseLink, they are often confused about the difference between them and which one they should use in their project. If you're one of them, don't worry. It's a lot easier than it seems.
https://blogs.oracle.com/theaquarium/jpa-and-nosql-using-eclipselink-mongodb-supported
EclipseLink 2.4 has added JPA support for NoSQL databases, MongoDB and Oracle NoSQL are the first ones to make the cut. The support to other NoSQL database can be extended by adding a EclipseLink EISPlatform class and a JCA adapter. A Java class can be mapped to a …
https://docs.oracle.com/middleware/12213/toplink/solutions/oracledb.htm
24 Using Oracle TopLink with the Oracle Database. This chapter provides instructions for understanding and using EclipseLink features in Oracle TopLink that are designed specifically to support the Oracle Database platform.
https://community.oracle.com/thread/2148557
EclipseLink does provide support for some esoteric Oracle DB features like hierarchical and flashback queries. OpenJPA and DataNucleus are also JPA compliant. It’s likely that Open JPA has a higher user base than EclipseLink, so less unknown bugs. Oracle paying support is well known to be a bad joke.
https://openjpa.apache.org/builds/1.2.3/apache-openjpa/docs/ref_guide_dbsetup_dbsupport.html
SimulateLocking: Some databases do not support pessimistic locking, which will result in an exception when you attempt a transaction while using the pessimistic lock manager. Setting this property to true suppresses the locking of rows in the database, thereby allowing pessimistic transactions even on databases that do not support locking.
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