Q1. What do you know about model 0, model 1 and model 2 MVC design patterns? A1. In the model 0 pattern, which is also known as the model-less pattern, business logic is embedded in the JSP pages. The model 0 pattern is fine for a very basic JSP page,...
Q1. What’s wrong with Servlets? What is a JSP? What is it used for? What do you know about model 0 (aka MVC0), model 1 (aka MVC1) and model 2 (aka MVC2) patterns? In “model 2” architecture, if you set a request attribute in your JSP, … Read more ›...
Q1. What is HATEOAS? How does it provide state transition, scalability, and loose coupling? A1. HATEOAS (Hypermedia as the Engine of Application State) is considered the final level of REST. This means that each link is presumed to implement the standard REST verbs of GET, … Read more ›...
Step 1: Create a Maven project structure
|
1 |
mvn archetype:generate -DgroupId=com.mytutorial -DartifactId=simpleSpringRestWeb -DarchetypeArtifactId=maven-archetype-webapp |
Step 2: pom.xml to get right jars
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 |
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.mytutorial</groupId> <artifactId>simpleSpringRestWeb</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <name>simpleSpringRestWeb</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>com.sun.xml.bind</groupId> <artifactId>jaxb-impl</artifactId> <scope>provided</scope> <version>2.1.3</version> </dependency> <dependency> <groupId>xml-apis</groupId> <artifactId>xml-apis</artifactId> <scope>provided</scope> <version>1.0.b2</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <scope>provided</scope> <version>3.0.1</version> </dependency> <dependency> <groupId>org.logback-extensions</groupId> <artifactId>logback-ext-spring</artifactId> <version>0.1.1</version> </dependency> <dependency> <groupId>org.springframework.hateoas</groupId> <artifactId>spring-hateoas</artifactId> <version>0.17.0.RELEASE</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.datatype</groupId> <artifactId>jackson-datatype-joda</artifactId> <version>2.3.2</version> </dependency> </dependencies> </project> |
Note that “spring-hateoas” is included. The “com.fasterxml.jackson.datatype” is required for the JSON processing. Step 3: Hello class with “ … Read more ›...
A ServletContext object refers to the whole web application, whilst a ServletConfig is for a Servlet. Once an application is deployed onto the web application, ServletContextListener may be configured using annotations or the configuration file named web.xml. … Read more ›...
Q1. What are the 6 REST constraints? A1. REST constraints are design rules that are applied to establish the distinct characteristics of the REST architectural style. These constraints don’t dictate what kind of technology to use, and they only define how data is transferred between components and what benefits we...
Since servlet 3.0 specification, the web.xml file in a web application is optional. The servlet 3.0 API introduced annotations to register servlets. Learn more at Servlet Interview Questions and Answers. Q1. What is a web.xml file? A1. … Read more ›...
SOAP Web Services interview Questions & Answers Links: 6 Java RESTful Web services Interview | 5 JAXB interview Questions & Answers | Java Web Services interview Questions & Answers Q1. What are the different approaches to developing a SOAP based Web service? … Read more ›...
Q1. What is the difference between the “RPC” and “Document” styles in SOAP? A1. There are two communication style models that are used to translate a WSDL binding to a SOAP message body. In RPC style, the body of the SOAP request body must contain both the 1) “operation name...
Example #1 Wiring JDBC Datasource
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 |
@Configuration @ImportResource("application.yml") public class AppConfig { @Autowired private Environment environment; @Bean public DriverManagerDataSource datasource() { DriverManagerDataSource ds = new DriverManagerDataSource(); ds.setDriverClassName(environment.getRequiredProperty("spring.datasource.driver-class-name")); ds.setUrl(environment.getRequiredProperty("spring.datasource.url")); ds.setUsername(environment.getRequiredProperty("spring.datasource.username")); ds.setPassword(environment.getRequiredProperty("spring.datasource.password")); return ds; } } |
application.yml where the datasource properties are read from.
|
1 2 3 4 5 6 7 8 9 10 11 12 |
############ # Datasource properties ############ spring: datasource: driver-class-name: com.sybase.jdbc4.jdbc.SybDataSource url: jdbc:sybase:Tds:mydbhost:5700/my_db username: user password: pwd |
Example #2 Wiring JDBC Datasource with JNDI
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
@Configuration @ImportResource("application.yml") public class AppConfig { @Autowired private Environment environment; @Bean public DataSource dataSource() { final JndiDataSourceLookup jndiLookup = new JndiDataSourceLookup(); final String dataSourceJndi = environment.getRequiredProperty("spring.datasource.jndi"); return jndiLookup.getDataSource(dataSourceJndi); } } |
Example #3 Wiring the JPA persistence unit processors Callback interface for post-processing a JPA PersistenceUnitInfo. … Read more ›...
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 ›...
Step 1:Create the Java Maven project:
|
1 |
mvn archetype:generate -DgroupId=com.mytutorial -DartifactId=simpleSoapWeb -DarchetypeArtifactId=maven-archetype-webapp |
Step 2: Need the libraries/frameworks
This example shows Apache CXF library as JAX-WS implementation with Spring and deployed to JBoss server 5.1.1.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 |
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.mytutorial</groupId> <artifactId>simpleSoapWeb</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>simpleSoapWeb Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <cxf.version>2.7.9</cxf.version> <javax-servlet.version>3.0.1</javax-servlet.version> <spring.version>3.1.0.RELEASE</spring.version> </properties> <dependencies> <!-- JAX-WS --> <!-- apache cxf --> <dependency> <groupId>org.apache.cxf</groupId> <artifactId>cxf-rt-frontend-jaxws</artifactId> <version>${cxf.version}</version> </dependency> <dependency> <groupId>org.apache.cxf</groupId> <artifactId>cxf-rt-transports-http</artifactId> <version>${cxf.version}</version> </dependency> <!-- Servelet API --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <scope>provided</scope> <version>${javax-servlet.version}</version> </dependency> <!-- Spring --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <scope>compile</scope> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.7.0</version> </dependency> </dependencies> <build> <finalName>simpleSoapWeb</finalName> </build> </project> |
Step 3: Web service interface with JAX-WS annotations
Folder: src/main/java
|
1 2 3 4 5 6 7 8 9 10 11 |
package com.mytutorial; import javax.jws.WebMethod; import javax.jws.WebService; @WebService public interface SimpleSoapWeb { @WebMethod public String sayHello(String name); } |
Step 4: Implementation of Web service interface
|
1 2 3 4 5 6 7 8 9 10 11 12 13 |
package com.mytutorial; import javax.jws.WebService; @WebService(endpointInterface = "com.mytutorial.SimpleSoapWeb", serviceName="simpleSoapService") public class SimpleSoapWebImpl implements SimpleSoapWeb { public String sayHello(String name) { String result = "Hello " + name; return result; } } |
Step 5: Spring XML config as IoC.
…
