Hello Pinaki, We declare the persistent domain classes in persistence.xml. Here is our persistence.xml content:
<persistence xmlns="http://java.sun.com/xml/ns/persistence"; version="1.0"> <persistence-unit name="active"> <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider> <jta-data-source>com.pwc.us.wcps.ds.WCPS_ACTIVE_DS</jta-data-source> <non-jta-data-source>com.pwc.us.wcps.ds.WCPS_ACTIVE_DS</non-jta-data-source> <class>com.pwc.us.wcps.dto.BaseContentDTO</class> <class>com.pwc.us.wcps.dto.ConfigDTO</class> <class>com.pwc.us.wcps.dto.PrimaryContentDTO</class> <class>com.pwc.us.wcps.dto.lists.RepeatedAttribute</class> <class>com.pwc.us.wcps.dto.DynamicCollectionDTO</class> <class>com.pwc.us.wcps.translations.VTranslationDTO</class> <class>com.pwc.us.wcps.translations.TranslationDTO</class> <class>com.pwc.us.wcps.translations.SubgroupDTO</class> <class>com.pwc.us.wcps.translations.GroupDTO</class> <class>com.pwc.us.wcps.dto.TerritoryDTO</class> <class>com.pwc.us.wcps.dto.FriendlyURLDTO</class> <class>com.pwc.us.wcps.taxonomy.TaxonomyDTO</class> <class>com.pwc.us.wcps.dto.MigrationMasterDTO</class> <properties> <property name="openjpa.TransactionMode" value="managed"/> <property name="openjpa.ConnectionFactoryMode" value="managed"/> <property name="openjpa.jdbc.DBDictionary" value="org.apache.openjpa.jdbc.sql.OracleDictionary"/> <property name="openjpa.Log" value="DefaultLevel=ERROR, Tool=FATAL, SQL=FATAL"/> <property name="openjpa.jdbc.QuerySQLCache" value="false"/> </properties> </persistence-unit> </persistence> For each request we create an instance of one of the persistent classes as follows: PrimaryContentDTO primaryContent = new PrimaryContentDTO(); And then we load from the database using a primary key: emf = WCPSUtils.getEMF(); // Set primary key BaseContentDTOPk pk = new BaseContentDTOPk(); pk.setA_webc_url(this.path); pk.setI_full_format("jhtml"); pk.setLanguage_code(this.getLocaleOverride()); // Load from database EntityManager em = emf.createEntityManager(); try { PrimaryContentDTO temp = em.find(this.getClass(), pk); // Need to merge returned values with this object if (temp != null) merge(temp); if (log.isDebugEnabled()) { log.debug("Begin loadFromDB()"); } } finally { em.close(); em = null; } The WCPSUtils class returns the singleton instance of the EntityManagerFactory. We have an inheritance hierarchy for most of the persistent classes. But the one above follows this hierarchy: BaseContentDTO -> ConfigDTO -> PrimaryContentDTO BaseContentDTO has a one-to-many relationship to RepeatedAttribute persistent class. We are eagerly fetching everything. We only do reads from the database, we have no inserts or updates. I believe all the classes will be loaded using the same web application class loader in WebSphere AppServer. Hope this is the information you needed to help us analyze this issue. Your help is really appreciated. Thanks, Darren Pinaki Poddar wrote: > > Hi, > Having a single instance of EntityManagerFactory and making it live for > the entire application lifetime is a good practice. Can you tell us how > the persistent domain classes for are being specified (and loaded) for the > application? > For example, do you declare them in <class> clause of persistence.xml? > Or in a orm.xml file? > Or are they not declared at all explicitly and loaded dynamically by the > application? > Also is the application using multiple classloaders to load these classes? > > The container in PCRegistry that has occupied so much memory in the > described profile is used to hold persistent domain class information. > Knowing the classloading behavior of the application will help diagnosis. > > > -- View this message in context: http://n2.nabble.com/Memory-Usage-tp3166851p3175091.html Sent from the OpenJPA Users mailing list archive at Nabble.com.
