Cascading Persistence in Hibernate

We have said, a number of times, that when an object is made persistent, that the objects it refers to are also made persistent. This was an oversimplification. In the mapping files for the classes, there is an attribute, cascade that lets us control how much, or how little, of a reference graph gets automatically persisted, deleted or updated. The values that it can be set to, and their meanings, are as follows:

• none: no automatic action on the referenced object takes place.
• save-update: automatically save or update the referenced object when the referencing object is saved or the transaction commits.
  delete: automatically delete the referenced object when delete() is called on the referencing object. Note that, if the referencing object is not deleted but merely removes its reference to the referenced object, then this option will not do anything and, potentially, a garbage (or orphan) object will be left in the database.
• delete-orphan: automatically delete any object for whom the reference has been removed from the referencing object.
• all: take the same actions as save-update and delete but not that of delete-orphan.
• all-delete-orphan: take the same action as save-update, delete and delete-orphan.

SpringMVC + Hibernate Error: No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here

http://sivalabs.blogspot.com/2011/05/springmvc-hibernate-error-no-hibernate.html

List of Cache Provider in Hibernate and their concurrency support details

Here in this port you can find the list of Cache providers and their Concurrency support details. (Exerted from Official Hibernate Tutorial)

EHCache (Easy Hibernate Cache)

(org.hibernate.cache.EhCacheProvider)

• It is fast.
• lightweight.
• Easy-to-use.
• Supports read-only and read/write caching.
• Supports memory-based and disk-based caching.
• Does not support clustering.

OSCache (Open Symphony Cache)

(org.hibernate.cache.OSCacheProvider)

• It is a powerful .
• flexible package
• supports read-only and read/write caching.
• Supports memory- based and disk-based caching.
• Provides basic support for clustering via either JavaGroups or JMS.

SwarmCache (org.hibernate.cache.SwarmCacheProvider)

• is a cluster-based caching.
• supports read-only or nonstrict read/write caching .
• appropriate for applications those have more read operations than write operations.

JBoss TreeCache (org.hibernate.cache.TreeCacheProvider)

• is a powerful replicated and transactional cache.
• useful when we need a true transaction-capable caching architecture .

Cache providers.

Cache	Provider class	Type	Cluster Safe	Query Cache Supported
Hashtable (not intended for production use)	org.hibernate.cache. HashtableCache Provider	memory		yes
EHCache	org.hibernate.cache. EhCacheProvider	memory, disk		yes
OSCache	org.hibernate.cache. OSCacheProvider	memory, disk		yes
SwarmCache	org.hibernate.cache. SwarmCacheProvider	clustered (ip multicast)	yes (clustered invalidation)	yes (clock sync req.)
JBoss Cache 1.x	org.hibernate.cache. TreeCacheProvider	clustered (ip multicast), transactional	yes (replication)	yes (clock sync req.)
JBoss Cache 2	org.hibernate.cache. jbc2.JBossCache RegionFactory	clustered (ip multicast), transactional	yes (replication or invalidation)	yes (clock sync req.)

Cache Concurrency Strategy Support

Cache	read-only	nonstrict-read-write	read-write	transactional
Hashtable (not intended for production use)	yes	yes	yes
EHCache	yes	yes	yes
OSCache	yes	yes	yes
SwarmCache	yes	yes
JBoss Cache 1.x	yes			yes
JBoss Cache 2	yes			yes