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Erman

Erman

Backend Java/Spring developer
| Turkey | Timezone UTC +3

Java
MySQL
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Erman is a professional Java Developer with more than 8 years of experience in Software development. He is an expert in a wide range of software technologies, focused on developing and supporting large scale software systems. Erman is professional with Java, Spring, Spring Boot, Hibernate. He has e...

Java
MySQL
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Igor

Igor

Java Web Developer
| Russian Federation | Timezone UTC +3

Java
MySQL
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Igor is a software engineer with 17 years of experience. He is self-motivated and has extensive experience with Java Spring framework. Igor can solve many complex problems and tasks. He is known for producing clean code very quickly, has a passion for learning, and enjoys solving algorithmic problem...

Java
MySQL
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Ahmad

Ahmad

Backend Web developer
| Egypt | Timezone UTC +3

Java
MySQL
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Ahmad is a skilled Backend Web developer with more than 8 years of hands-on experience in Software development. He specializes in building server-side solutions using Java / Spring, C, Python stack. He is strong with Linux and certified as a server administrator. Ahmad is interested in contributing...

Java
MySQL
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Tomas

Tomas

Senior Java Engineer
| Czech Republic | Timezone UTC +3

Java
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Tomas is a Senior Software Engineer with more than 10 years of extensive Java, Spring, experience and 5 years of JavaScript experience. Tomas has in-depth knowledge of various Design Patterns, Information, and Database System Design, computer vision and virtual reality. Also, he is passionate about ...

Java
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Gokhan

Gokhan

Senior Java Developer
| Turkey, Istanbul | Timezone UTC +3

Java
MySQL
Angular
AWS
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Gokhan has been developing software since he was 15 years old. He is a big fan of Agile methodologies (Scrum and Kanban), automated deployment and continuous integration (Hudson/Jenkins), Core Java and Java EE for Web and mobile development. He’s experienced in working in high-paced environments, an...

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Spring Developers for Hire: FAQ

Spring Developers for Hire: FAQ

Spring Developers for Hire: FAQ


Seo: Spring framework, Java Spring developer, Spring Boot, Hibernate Java, Spring developer tools, Spring developers for hire, find top Spring developers, hire a developer with a Spring professional certification.


What is a Spring framework? What exactly is the Spring framework used for?

In fact, by “Spring,” people refer to all Spring projects built on top of Spring Framework. Spring Framework is an open-source application framework and inversion of control for the Java platform. The core features of the framework can be applied and used by any Java application; however, there are extensions for building web apps on top of the Java EE platform. Because of the popularity of the Spring framework inside the Java community, it’s sometimes used as a replacement for the Enterprise JavaBeans model. The first version of the framework dates as far back as October 2002; the latest version is Spring 5 of 2017. The Spring framework includes the following modules: Spring Core Container (BeanFactory and ApplicationContext), aspect-oriented programming, authentication and authorization, data access, conversion over configuration, inversion of control, messaging, remote access framework, transaction management, testing, remote management, and, of course, Model-View-Controller. Spring provides everything to embrace the Java language in an enterprise environment, it also supports Groovy and Kotlin as alternative languages on the JVM. Spring 5.0 requires JDK 8+ (Java SE 8+) and provides support for JDK 9.


What is a Java Spring developer?

A Java Spring developer is a programming specialist who designs, implements, and maintains Java applications using Spring framework. 


What are Spring developer roles and responsibilities?

The definitive roles and responsibilities will predictively vary from company to company, but the main duties might include:

  • Design and develop Java applications on top of Spring framework
  • Create and maintain reusable and reliable Java code
  • Ensure quality and responsiveness of Java applications
  • Test, identify, fix bugs, and devise possible solutions to address multiple issues


What are the Spring developer prerequisites?

Spring developer should possess the following skill set:

  • Proficient in Java and its ecosystems
  • Proficient in Spring framework
  • Familiar with different design and architectural patterns
  • Can write reusable Java libraries
  • Understands the concepts of MVC, JDBC, and RESTful
  • Understands Java GUI frameworks
  • Understands JVM and its workarounds
  • Knows build tools such as Ant, Maven, and Gradle
  • Familiar with code versioning tools, such as Git


What is the Spring Boot?

Spring Boot is a microframework from the Pivotal team, which is designed to simplify the development of a new Spring app. Spring Boot is a pre-sugared, pre-configured set of technologies to reduce boilerplate configuration and provide the shortest way possible to get a Spring app up and running.


What is a Spring professional certification?

Spring professional certification is an exam that’s designed to test and validate developer knowledge and understanding of Spring. The exam tests the following: container basics, aspect-oriented programming, data access and transactions, Spring MVC.


Do I need to hire a developer with a Spring professional certification?

Not necessarily. However, since Spring developers are in demand, it’s good to have some sort of metrics to determine a developer knowledge in a quantifiable way. Besides, a certified professional is a professional who has been trained, tested, and whose baseline knowledge of Spring has been verified. 


What is Hibernate Java?

Hibernate ORM is an object-relational mapping tool for the Java programming language, a persistence framework. Hibernate provides a framework for mapping an object-oriented domain model to a relational database. It generates SQL calls thus relieving a developer from manual handling and object conversion of the result set. Hibernate is basically a rich set of database utility functionality, which reduces your lines of code.


Where can I find top Spring developers?

Congratulations, you’re in the right place, because Soshace.com provides a pool of talented Spring developers you can trust.


Practice questions for Spring Developers:


How to load multiple spring bean configuration files?

You have separated your configurations into two files, one is to manage jdbc configurations, and another one is to manage all beans. Below configuration file called database-config.xml handles all jdbc configurations:

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
 
    <bean id="dataSource"
            class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName">
            <value>com.mysql.jdbc.Driver</value>
        </property>
        <property name="url">
            <value>jdbc:mysql://localhost:3306/article</value>
        </property>
        <property name="username"><value>root</value></property>
        <property name="password"><value>password</value></property>
    </bean>
</beans>


Here is another configuration file which handles all beans with in the application, it is called bean-config.xml file:

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
 
    <bean id="appDao" class="com.article.beans.MyAppDao" />
    <bean id="empEntity" class="com.article.beans.Employee" />
    <bean id="companyBean" class="com.article.beans.Company" />
</beans>

Create applicationContext.xml we need to load to get all bean objects.

Answer

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
 
    <import resource="bean-config.xml" />
    <import resource="database-config.xml" />
</beans>


Constructor overloading issue

Here is the sample spring bean configuration file:

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
 
    <bean id="articleBean" class="com.article.bean.Article">
         
        <constructor-arg type="java.lang.String">
            <value>Article title</value>
        </constructor-arg>
         
        <constructor-arg type="int">
            <value>120</value>
        </constructor-arg>
    </bean>
</beans>


Provide the class sample to specify input parameter type

Answer

package com.article.bean;
 
public class Article {
 
    private String title;
    private int number;
    private String body;
     
    public Article(String title, int number){
        this.title = title;
        this.number = number;
    }
     
    public Article(String title, String body){
        this.title = title;
        this.body = body;
    }
}


How to reduce tight coupling in the following code?

public class BusinessService {
  /* using ComplexAlgorithmImpl ... */
}

public class ComplexAlgorithmImpl {
  BubbleSortAlgorithm bubbleSortAlgorithm = new BubbleSortAlgorithm();
  /* ... */
}

Answer

@Component
public class ComplexAlgorithmImpl {

  @Autowired
  private SortAlgorithm sortAlgorithm;
  /* ... */
}

public interface SortAlgorithm {
  public int[] sort(int[] numbers);
}

public class QuickSortAlgorithm implements SortAlgorithm {
  /* ... */
}

public class BubbleSortAlgorithm implements SortAlgorithm {
  /* ... */
}


Update the code using jdbcTemplate

Connection connection = datasource.getConnection();

PreparedStatement st = connection.prepareStatement(
  "Update todo set user=?, desc=?, target_date=?, is_done=? where id=?");

st.setString(1, todo.getUser());
st.setString(2, todo.getDesc());
st.setTimestamp(3, new Timestamp(todo.getTargetDate().getTime()));
st.setBoolean(4, todo.isDone());
st.setInt(5, todo.getId());

st.execute();
st.close();
connection.close();

Answer

jdbcTemplate
.update
 ("Update todo set user=?, desc=?, target_date=?, is_done=? where id=?",
    todo.getUser(), todo.getDesc(),
    new Timestamp(todo.getTargetDate().getTime()),
    todo.isDone(), todo.getId());


Can you show the code for an example Get Resource method with Spring REST?

Answer

@Controller
public class UserController {
	@GetMapping("/users")
	public List<User> retrieveAllUsers() {
	  return service.findAll();
	}
}