Q1. What is Domain Driven Design (i.e. DDD)? What is DDD oriented microservice? A1. Domain-driven design advocates modelling based on the reality of business as relevant to your use cases. In the context of building applications, DDD talks about problems as domains. If you are building a shopping cart application,...
Java microservices interview questions and answers covering microservices patterns, best practices, Springboot and Spring cloud . Q1. How will you go about choosing REST vs Messaging for Microservices? A1. Microservices can be invoked both synchronously and asynchronously. Microservices must be organized around business functionalities like Customers, … Read more ›...
Insights into what your prospective employers are looking for. What skills are required for you to go places? Do you know your industry well enough to impress your prospective employers?
Prospective employers will be judging you on 4 key aspects
1) Do you have the right technical “know how”?
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Q1. Can you describe the Spring Web MVC framework architecture? A1. Spring Web MVC framework provides a Model View Controller architecture to develop loosely coupled 1) web applications 2) RESTful web services. … Read more ›...
Here is a sample maven pom.xml snippets containing the dependency jars.
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.... <hibernate.version>4.1.3.Final</hibernate.version> <hibernate-jpa-2.0-api.version>1.0.1.Final</hibernate-jpa-2.0-api.version> <hibernate-validator-annotation-processor>4.2.0.Final</hibernate-validator-annotation-processor> <hibernate-validator.version>4.3.0.Final</hibernate-validator.version> |
The above snippet defines the version numbers. The snippet below defines the dependencies.
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... <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> </dependency> <dependency> <groupId>org.hibernate.javax.persistence</groupId> <artifactId>hibernate-jpa-2.0-api</artifactId> </dependency> <dependency> <groupId>javax.validation</groupId> <artifactId>validation-api</artifactId> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator</artifactId> </dependency> <dependency> <groupId>org.hibernate.javax.persistence</groupId> <artifactId>hibernate-jpa-2.0-api</artifactId> <version>${hibernate-jpa-2.0-api.version}</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator-annotation-processor</artifactId> <version>${hibernate-validator-annotation-processor}</version> </dependency> <!-- bean validation --> <dependency> <groupId>javax.validation</groupId> <artifactId>validation-api</artifactId> <version>1.0.0.GA</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator</artifactId> <version>${hibernate-validator.version}</version> </dependency> |
If you want to auto-generate your hibernate entities from DDL then.
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<build> <resources> <resource> <directory>${basedir}/src/main/resources</directory> <includes> <include>**/*</include> </includes> </resource> </resources> <plugins> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>hibernate3-maven-plugin</artifactId> <configuration> <components> <component> <name>hbm2ddl</name> <implementation>jpaconfiguration</implementation> </component> <component> <name>hbmdoc</name> </component> </components> <componentProperties> <persistenceunit>my-data</persistenceunit> <outputfilename>schema.ddl</outputfilename> <drop>true</drop> <create>true</create> <export>false</export> <format>true</format> </componentProperties> </configuration> </plugin> </plugins> </build> |
Finally, … Read more ›...
This extends Mockit interview Q&As & examples on matching anyX field and withX() methods. JMockit offers a set of utility fields & methods for making argument matching more generic. 1) anyX fields like anyInt, … Read more ›...
This is an extension to Java Tree structure interview questions and coding questions — Part 3 where recursion was used for FlattenTree interface. Let’s use iteration here. Step 1: The FlattenTree interface.
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package com.mycompany.flatten; public interface FlattenTree<T> { void flatten(Tree<T> tree); } |
Step 2: The iterative implementation … Read more ›...
Q. Given the following code
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public class WorkingOnXandY { public static void main(String[] args) { SharedObject obj = new SharedObject(); Thread thread1 = new Thread(new Runnable() { @Override public void run() { for (int i = 0; i < 5; i++) { obj.workOnX(); } } }); Thread thread2 = new Thread(new Runnable() { @Override public void run() { for (int i = 0; i < 5; i++) { obj.workOnY(); } } }); thread1.start(); thread2.start(); } } |
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public class SharedObject { private int x = 0; private int y = 0; private int a = 0; private int b = 0; public void workOnX() { x = 1; // write to X a = x; // read from x System.out.println("a=" + a); } public synchronized void workOnY() { y = 1; // write to y b = y; // read from y System.out.println("b=" + b); } } |
Output:
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a=1 a=1 a=1 a=1 a=1 b=1 b=1 b=1 b=1 b=1 |
Complete the above code so that it prints a=1 and b=1 interleaved.
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a=1 b=1 a=1 b=1 a=1 b=1 |
A. The solution is to have inter thread communication between both threads.
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Q1. What are JDBC Statements? What are different types of statements? How can you create them? A1. A statement object is responsible for sending the SQL statements to the Database. Statement objects are created from the connection object and then executed.
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Statement stmt = myConnection.createStatement(); ResultSet rs = stmt.executeQuery(“SELECT id, name FROM myTable where id =1245”); //to read or stmt.executeUpdate(“INSERT INTO (field1,field2) values (1,3)”); //to insert |
The types of statements are: Statement (regular statement...
Q1. Why use design patterns? A1. 1) Capture design experience from the past: E.g. Facade and value object patterns evolved from performance problems experienced due to multiple remote calls. 2) Promote reuse without having to reinvent the wheel: E.g. … Read more ›...
1. Interviews are not technical contests
to see who gets the most number of questions right. Nobody knows everything. so, don’t be overwhelmed by the number of Q&As on this site. It is all about effectively & confidently communicating your ability to add value to an organisation.
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Q1. What are the different types of UML diagrams? A1. Use case diagrams, Class diagrams, Package diagrams, Object diagrams, Sequence diagrams, Collaboration diagrams, and State chart diagrams. Q2. What is a use case diagram, and when will you use it? A2. … Read more ›...
This extends 12 Web basics every Java web developer must know – Part 1 Q7. What do you understand by client side and server side templating? A7. The modern rich single page web applications built today harness the power of dynamically typed and interpreted languages like JavaScript for faster prototyping...
