No default ctor exists for ActivityImpl. This issue may be related to a review of Activity and whether it may be abstract. The RDF synchronization process intantiates ActivityImpl objects via the "findActivities" query, which may throw the exception below, due to missing ctor.

org.springframework.orm.hibernate3.HibernateSystemException: No default constructor for entity: eske.model.metadata.activities.ActivityImpl; nested exception is org.hibernate.InstantiationException: No default constructor for entity: eske.model.metadata.activities.ActivityImpl
at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:676)
at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:412)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:424)
at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
at org.springframework.orm.hibernate3.HibernateTemplate.findByNamedQuery(HibernateTemplate.java:988)
at org.springframework.orm.hibernate3.HibernateTemplate.findByNamedQuery(HibernateTemplate.java:980)
at eske.dao.metadata.impl.hibernate.MetadataDAOImpl.findObjectsByNamedQuery(Unknown Source)
at eske.service.metadata.impl.spring.MetadataServiceImpl$20.doInTransaction(Unknown Source)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
at eske.service.metadata.impl.spring.MetadataServiceImpl.findObjectsByNamedQuery(Unknown Source)
at eske.service.query.impl.harvest.RDFsynchronizerImpl.process(Unknown Source)
at eske.service.query.impl.harvest.RDFsynchronizerImpl.synchronize(Unknown Source)
at eske.service.query.impl.harvest.RDFsynchronizerJob.execute(Unknown Source)
at sun.reflect.GeneratedMethodAccessor233.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:276)
at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java:260)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:529)
Caused by: org.hibernate.InstantiationException: No default constructor for entity: eske.model.metadata.activities.ActivityImpl
at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:107)
at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:123)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.instantiate(AbstractEntityTuplizer.java:374)
at org.hibernate.persister.entity.AbstractEntityPersister.instantiate(AbstractEntityPersister.java:3634)
at org.hibernate.impl.SessionImpl.instantiate(SessionImpl.java:1302)
at org.hibernate.impl.SessionImpl.instantiate(SessionImpl.java:1291)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1323)
at org.hibernate.loader.Loader.getRow(Loader.java:1230)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:603)
at org.hibernate.loader.Loader.doQuery(Loader.java:724)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
at org.hibernate.loader.Loader.doList(Loader.java:2228)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
at org.hibernate.loader.Loader.list(Loader.java:2120)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
at org.springframework.orm.hibernate3.HibernateTemplate$33.doInHibernate(HibernateTemplate.java:997)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:419)
... 18 more



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