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Version checking used in hibernate when more then one thread trying to access same data. For example : User A edit the row of the TABLE for update ( In the User Interface changing data This is user thinking time) and in the same time User B edit the same record for update and click the update. Then User A click the Update and update done. Change made by user B is gone. In hibernate you can prevent slate object updation using version checking. Check the version of the row when you are updating the row. Get the version of the row when you are fetching the row of the TABLE for update. On the time of updation just fetch the version number and match with your version number (on the time of fetching).

Containers are the interface between a component and the low-level, platform-specific functionality that supports the component. Before it can be executed, a web, enterprise bean, or application client component must be assembled into a Java EE module and deployed into its container. The assembly process involves specifying container settings for each component in the Java EE application and for the Java EE application itself. Container settings customize the underlying support provided by the Java EE server, including such services as security, transaction management, Java Naming and Directory Interface (JNDI) API lookups, and remote connectivity. Here are some of the highlights. The Java EE security model lets you configure a web component or enterprise bean so that system resources are accessed only by authorized users. The Java EE transaction model lets you specify relationships among methods that make up a single transaction so that all methods in one transaction are treated as a

I have opened a DEMAT account with HDFC Securities in 2019 as HDFC group is well known for the customer services and I also hold a salary account with HDFC Bank, DEMAT account with the following conditions/offers as expressed by the executive. Trading Account Opening Charges (One Time) :  ₹999 (At that time it offered on lower price, I forget the exact price) Trading Annual Maintenance Charges AMC (Yearly Fee) : ₹0 Demat Account Opening Charges (One Time) : ₹0 Demat Account Annual Maintenance Charges AMC (Yearly Fee) : ₹750, nil if portfolio value below ₹2 lacs. Equity Delivery : 0.50% Equity Intraday : 0.05% Equity Futures : 0.05% Equity Options : ₹100 per lot or 1% of the premium (whichever is higher) Currency Futures : ₹23 per contract Currency Options : ₹20 per contract Commodity Futures : 0.02% for Intraday / 0.025% for positional Commodity Options : 0.02% for Intraday / 0.025% for positional It was going good but after 2-3 months I got to know that there are som