org.hibernate.MappingException: entity class not found: FileToSave
at org.hibernate.mapping.PersistentClass.getMappedClass(PersistentClass.java:98)
at org.hibernate.tuple.PropertyFactory.getGetter(PropertyFactory.java:163)
at org.hibernate.tuple.PropertyFactory.buildIdentifierProperty(PropertyFactory.java:43)
at org.hibernate.tuple.EntityMetamodel.<init>(EntityMetamodel.java:114)
at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:410)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:108)
at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:219)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1126)
at org.hibernate.console.ConsoleConfiguration$2.execute(ConsoleConfiguration.java:209)
at org.hibernate.console.execution.DefaultExecutionContext.execute(DefaultExecutionContext.java:35)
at org.hibernate.console.ConsoleConfiguration.execute(ConsoleConfiguration.java:71)
at org.hibernate.console.ConsoleConfiguration.initSessionFactory(ConsoleConfiguration.java:207)
at org.hibernate.eclipse.console.workbench.ConsoleConfigurationWorkbenchAdapter.getChildren(ConsoleConfigurationWorkbenchAdapter.java:24)
at org.hibernate.eclipse.console.workbench.BasicWorkbenchAdapter.fetchDeferredChildren(BasicWorkbenchAdapter.java:68)
at org.eclipse.ui.progress.DeferredTreeContentManager$1.run(DeferredTreeContentManager.java:192)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:76)
Caused by: java.lang.ClassNotFoundException: FileToSave
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:405)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:350)
at org.eclipse.osgi.framework.adaptor.core.AbstractClassLoader.loadClass(AbstractClassLoader.java:78)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:108)
at org.hibernate.mapping.PersistentClass.getMappedClass(PersistentClass.java:95)
... 16 more

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Anyone has any idea how to fix this ???

missing mapping reference in hibernate.cfg.xml perhaps.

Post the hibernate.cfg.xml and your mapping for the FileToSave class.

Caused by: java.lang.ClassNotFoundException: FileToSave

Most likey you are missing the package information

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Yeah, I solved this by adding my library WEB-INF/classes to Hibernate Configuration classpath.