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Ans. This scope indicates that the dependency is not required for normal use of the application, and is only available for the test compilation and execution phases. This scope is not transitive.
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Ans. That depends if the interface for the resource in Project B gets changed. If only the internal implementation is changed, No change is required in Project A. Project A is not even required to be rebuilt.
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Ans. Entries in DB will be retrieved at runtime unless a cache is maintained in application. Entries in File will be loaded to memory by default. Both can be implemented in 1 manner or other. By default property file will take space in memory, will be faster, and will require application restart on change. By Default DB config will be pulled at runtime, will be little slower, and doesn't require an application restart.
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Ans. A dirty read occurs when a transaction is allowed to read data from a row that has been modified by another running transaction but not yet committed.
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Ans. Item is a sale-able merchandise where as Product is a group of sale-able merchandise which share certain attributes. For example - Cell phone is a product whereas Samsung Galaxy S2 - White is an item.
Quantity is always attached to SKU ( Stock keeping unit ) or items. Product quantity has no relevance in terms of identify the current stock or reorder condition.
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Ans. Yes, When either we don't want an object to be created ( class having all static elements and hence not required ) or object to be created using a static method or static block.
One such example could be a situation when we would like app to load objects at start up and we would like to restrict new object creation by any request.
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Ans. We can use an expiration map whose entries gets expired after a certain interval and then we can put the logic to retrieve the entries if its expired in map.
Alternatively we can create a separate class and make map its element. We can refresh the map in this class periodically by using a monitoring thread within static block.
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Ans. I use trace for debugging purpose. Info for displaying some important info, thought its rare as we have enabled info logging in production. Warn in case something went wrong but we still resume the flow in spite of it or have take alternate flow as its expected sometimes. Error logging in case it was completely unexpected and mostly when it breaks the flow.
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Ans. No, member variables of a interface are final by default.
The final ensures the value assigned to the interface variable is a true constant that cannot be re assigned by program code.
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Ans. This exception usually occur if we try to register the bean with name already present in the registry or repository. Usually this happens when multiple tests are executed at once in single container.
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Ans. When executing tests it is common that multiple tests need similar objects to be created before they can run. @before specifies a method that provide that initialization for the set of Unit Tests.
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Ans. NumberFormatException is the exception that Java throws when we try to convert one data type to the Number data type but the value is not parsable to be a Number.
For example , the following code will result in the NumberFormatException
String string = "Buggy";
int strtoInt = Integer.parseInt(string);
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