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UserException - Object User#2 belongs to another EntityManager

.] javax.ejb.EJBException: The bean encountered a non-application exception; nested exception is: com
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Web Framework Recommendation for leveraging JPA + ObjectDB

, JSPs, JSF and EJB. Spring MVC Framework with either a servlet container or an application server
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What are the steps of creating small web app?

, JSP, EJB, JMS, JPA, JDBC,Security, Ajax using Primefaces. # Backend technologies: MYSQL, SQLite
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Does ObjectDB create one instance of each entity class on (web app) load ?

too much memory. I use a (mostly) LAZY-only fetch policy across the system. Most of my EJB methods for querying
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Query can't see recently persisted object

When using container managed transactions (EJB) in Payara 4.1.3 with ObjectDB embedded, ObjectDB does not appear to present a read consistent view of persisted objects within the same transaction. e.g. in the following code the NoResultException is correctly thrown on the first occasion