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spring-interview-questions-answers

Spring Data JPA and pagination

Let us start with the classic JPA way to support pagination. Consider a simple domain class – A ‘Member’ with attributes first name, last name. To support pagination ...
java-interview-questions-answers

Mixin in Java with Aspects – for a Scala traits sample

Scala traits allow new behaviors to be mixed into a class. Consider two traits to add auditing and version related fields to JPA entities:                   package ...
spring-interview-questions-answers

Spring Property Placeholder Configurer – A few not so obvious options

Spring’s PropertySourcesPlaceholderConfigurer is used for externalizing properties from the Spring bean definitions defined in XML or using Java Config. There are a few options ...
spring-interview-questions-answers

Spring MVC – Customizing RequestMappingHandlerMapping

When Spring MVC is configured using <mvc:annotation-driven/> in an xml bean definition file, internally a component called RequestMappingHandlerMapping gets registered with Spring ...
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JUnit test method ordering

Junit until version 4.10 uses the order of test methods in a test class as returned by the reflection API as the order of test method execution - Class.getMethods(). To quote the Javadoc ...
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Json deserialization with Jackson and Super type tokens

Datatables is a jquery plugin to present tabular information – it can enhance a simple table or can use a AJAX based data and present the information in a tabular form. Datatables ...
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Composing Java annotations

The allowed attribute types of a Java annotations are deliberately very restrictive, however some clean composite annotation types are possible with the allowed types.                     Consider ...
spring-interview-questions-answers

Polling an http end point using Spring Integration

It is a little non-intuitive if you want to write a flow with Spring Integration which polls an http end point and gathers some content from the http end point for further processing. Spring ...
spring-interview-questions-answers

Method Parameter Names and Spring

Continuing on the previous blog entry about Constructor and method parameters and Java not retaining the parameter names at runtime – the previous entry was about constructor ...
spring-interview-questions-answers

Spring Constructor Injection and Argument names

At runtime, java classes do not retain the name of the constructor or method parameters, unless classes are compiled with debug options on.This has some interesting implications ...
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