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ObjectDB version 2.5.5

ObjectDB with JBoss. Fixed query execution issues with using composite indexes. Fixed a bug in using LIKE ... .DATE) on some time zones. Fixed log archiving to affect only "odb*.log" files. Fixed an Explorer bug in displaying Integer embedded ID fields as Long.
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Connections pool

Hi! Does ObjectDB keeps and reuses a pool of connections as MySQL JDBC driver does? I mean when it's used in a container like Tomcat, Glassfish, JBoss etc. Thank you. Yes. Every EntityManagerFactory instance manages a pool of connections and reuses them when it creates new EntityManager instances
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Many connections possible? and will it makes problem in future?

the application server or web server (GlassFish, JBoss, Tomcat) or by dedicated load balancing tools ... practical factors such as thread numbers (depending on your operating system) and TCP/IP ports (when using client-server mode). kadirbasol
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Object belongs to another EntityManager - ERROR

.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java
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Web Framework Recommendation for leveraging JPA + ObjectDB

can switch Persistence Engines as I see fit later on ! So that I can easily switch to a true OODBMS ... (Tomcat / Jetty) with servlets and JSPs. Java EE application server (JBoss / GlassFish) with servers
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system exception occurred during an invocation on EJB GuestDao

) at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582) at org.jboss.weld.ejb ... ) at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke ... (InterceptorManager.java:822) at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582) at org.jboss.weld
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java.lang.Throwable

of the exceptional situation so as to include relevant information (such as stack trace data). A throwable contains ... . It is also known as the chained exception facility, as the cause can, itself, have a cause ... thrown by the lower layer propagate outward, as it is generally unrelated to the abstraction provided
JDO Doc
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javax.jdo.PersistenceManagerFactory

listeners set as the initial listeners for each PersistenceManager created by this PersistenceManagerFactory. Add the parameter listener to the list of instance lifecycle event listeners set as the initial ... of interest. If the classes parameter is specified as null, events for all persistent classes and interfaces
JDO Doc
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javax.jdo.spi.PersistenceCapable

SERIALIZABLE, then the field is not declared as TRANSIENT. If jdoFieldFlags for a field includes SERIALIZABLE, then the field is not declared as TRANSIENT. Since: JDO 1.0 void jdoCopyFields(Object ... an exception if the other instance is not managed by the same StateManager as this instance. Parameters
JPA Doc
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JPA Exceptions

wraps the real failure cause as a nested exception  (which can be obtained by the getCause method