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Writing Clean Tests – New Considered Harmful

It is pretty hard to figure out a good definition for clean code because everyone of us has our own definition for the word clean. However, there is one definition which seems to be ...
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JPA 2.1 Entity Graph – Part 1: Named entity graphs

Lazy loading was often an issue with JPA 2.0. You have to define at the entity if you want to use FetchType.LAZY (default) or FetchType.EAGER to load the relation and this mode is always ...
java-interview-questions-answers

Generate your JAXB classes in a second with xjc

Since JAXB is part of the JDK, it is one of the most often used frameworks to process XML documents. It provides a comfortable way to retrieve and store data from XML documents to Java ...
java-interview-questions-answers

SSL encrypted EJB calls with JBoss AS 7

Encrypting the communication between client and server provides improved security and privacy protection for your system. This can be an important requirement by the customer, especially ...
spring-interview-questions-answers

Spring Rest Controller with angularjs resource

Angularjs ngResource is an angularjs module for interacting with REST based services. I used it recently for a small project with Spring MVC and wanted to document a configuration ...
java-interview-questions-answers

JPA 2.1 Type Converter – The better way to persist enums

Persisting enums with JPA 2.0 is possible, but there is no nice way to do it. Using the @Enumerated annotation, you can use EnumType.ORDINAL or EnumType.STRING to map the enum value ...
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ElasticSearch-Hadoop: Indexing product views count and customer top search query from Hadoop to ElasticSearch

This post covers to use ElasticSearch-Hadoop to read data from Hadoop system and index that in ElasticSearch. The functionality it covers is to index product views count and top search ...
java-interview-questions-answers

Integration Tests for External Services

Our systems often depend on 3rd party services (They may even be services internal to the company that we have no control on). Such services include Social Networks exposing APIs, SaaS ...
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Hive: Query customer top search query and product views count using Apache Hive

This post covers to use Apache Hive to query the search clicks data stored under Hadoop. We will take examples to generate customer top search query and statistics on total product ...
java-interview-questions-answers

Flume: Gathering customer product search clicks data using Apache Flume

This post covers to use Apache flume to gather customer product search clicks and store the information using hadoop and elasticsearch sinks. The data may consist of different product ...
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