[hibernate-issues] [Hibernate-JIRA] Updated: (HHH-5571) Hibernate loading the wrong bean in collection from the session cache (very unusual case), it occurs only for specific set of data.

[vinay kumar (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

vinay kumar updated HHH-5571:
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    Issue Type: Bug  (was: New Feature)

> Hibernate loading the wrong bean in collection from the session cache (very unusual case), it occurs only for specific set of data.
> -----------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-5571
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5571
>             Project: Hibernate Core
>          Issue Type: Bug
>         Environment: Ehcache(ehcache-core-2.0.0.jar), Jdk 1.6.0_12
>            Reporter: vinay kumar
>         Attachments: HibernateBug sources.rar
>
>
>     I have a customer order from a retail catalog project. The central class is the Order. Associated with it are the Customer and Provider Company, customer making the purchase and the Payment. A Payment is one of three kinds: Cash, Check, or Credit. The order contains OrderDetails (line items), each with its associated Item.
> so each customer has set of orders in turn each order has one of the three kinds of payment. When ever i load two customers in the same transaction and i read the orders of the customers, one of the order is misplaced into other customer (it very unusual and happens only for specific set of data). 
> Test Case : I have two customers US customer and Italy Customer with set of orders. when i try to load the two customers in the same transaction and check the orders so i get the following values. Here i don't change any values, the session is readOnly. Bean hashcode and equals methods are manually overridden. 
> Italy Customer.getOrders 
> {start t1} 
> 1) Order : [Customer Name = Italy Customer, Company Product : Apple Power Chord] Payment : Cheque = 100 € 
> 2) Order : [Customer Name = Italy Customer, Company Product : Apple Mac Pro] Payment : Cheque = 2000 € 
> 3) Order : [Customer Name = Italy Customer, Company Product : Microsoft Usb] Payment : Cheque = 200 € 
> 4) Order : [Customer Name = Italy Customer, Company Product : Apple Mac Air] Payment : Cheque = 1500 € 
> 5) Order : [Customer Name = Italy Customer, Company Product : Microsoft Keyboard] Payment : Credit = 73.7153€ 
> 6) Order : [Customer Name = Italy Customer, Company Product : Apple MacBook ] Payment : Cheque = 1000 € 
> 7) Order : [Customer Name = Italy Customer, Company Product : Dell Mouse] Payment : Credit = 6.90361€ 
> 8) Order : [Customer Name = Italy Customer, Company Product : Apple TV] Payment : Cash = 10000€ 
> 9) Order : [Customer Name = Italy Customer, Company Product : Siemens HeadPhone] Payment : Credit = 100.0€ 
> {end t1} 
> US Customer.getOrders 
> {start t2}
> 1) Order : [Customer Name = U.S Customer, Company Product : Dell Mouse] Payment : Credit = 6.69889$ 
> 2) Order : [Customer Name = U.S Customer, Company Product : Microsoft Keyboard] Payment : Credit = 73.7144$ 
> 3) Order : [Customer Name = U.S Customer, Company Product : Siemens HeadPhone] Payment : Credit = 164.0$ 
> 4) Order : [Customer Name = U.S Customer, Company Product : Apple TV] Payment : Cash = 10000$
> 5) Order : [Customer Name = U.S Customer, Company Product : Microsoft Usb] Payment : Cheque = 200 $ 
> 6) Order : [Customer Name = U.S Customer, Company Product : Apple MacBook ] Payment : Cheque = 1000 $ 
> 7) Order : [Customer Name = U.S Customer, Company Product : Apple Power Chord] Payment : Cheque = 100 $ 
> 8) Order : [Customer Name = U.S Customer, Company Product : Apple Mac Pro] Payment : Cheque = 2000 $ 
> 9) Order : [Customer Name = U.S Customer, Company Product : Apple Mac Air] Payment : Cheque = 1500 $ 
> Italy Customer.getOrders 
> 1) Order : [Customer Name = Italy Customer, Company Product : Apple Power Chord] Payment : Cheque = 100 € 
> 2) Order : [Customer Name = Italy Customer, Company Product : Apple Mac Pro] Payment : Cheque = 2000 €
> 3) Order : [Customer Name = Italy Customer, Company Product : Microsoft Usb] Payment : Cheque = 200 € 
> 4) Order : [Customer Name = Italy Customer, Company Product : Apple Mac Air] Payment : Cheque = 1500 € 
> 5) Order : [Customer Name = Italy Customer, Company Product : Microsoft Keyboard] Payment : Credit = 73.7153€
> 6) Order : [Customer Name = Italy Customer, Company Product : Apple MacBook ] Payment : Cheque = 1000 € 
> 7) Order : [Customer Name = U.S Customer, Company Product : Apple TV] Payment : Cash = 10000$ 
> 8) Order : [Customer Name = Italy Customer, Company Product : Apple TV] Payment : Cash = 10000€ 
> 9) Order : [Customer Name = Italy Customer, Company Product : Siemens HeadPhone] Payment : Credit = 100.0€ 
> { end t2}
>  where t1,2 are two different transactions. When im trying to load the italy customer in t2 the order 'Dell mouse' is replaced by US customer's 'Apple TV'. 
> Observations : 
> 1) if i try to separate the transactions for each customer, the problem doesn't exist.
> 2) if i try to evict the same bean and try to load again , still the problem persists.(italy customer here) 
> 3) if i try to evict the other bean and try to load, the problem doesnt exist.(US customer here) 
> 4) if i try to clear the session and load again the orders all the time, the problem doesnt exist. 
> 5) if i try to set the CacheMode to IGNORE still the problem persists. 
> 6) This problem only exists for certain data values. In test case i have Italy Customer(cust_id = 5799847) and US Customer (cust_id = 5799736). If i change one of the id of the customer the problem doesnt exist. if i increase and decrease the both values by 'n' the problem persist again.(very strange). 

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