Monday, November 14, 2016

How to call a java class from scala

Create an Eclipse java maven project.

Add Scala nature to the project Right click on project > Configure > Add Scala Nature

Create project structure as:
src/main/java
src/main/scala

Sample Java class:

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package test.java;

public class Hello {

    public static void main(String[] args) {
        Hello hello = new Hello();
        hello.helloUser("Tomcat");

    }

    public void helloUser(String user) {
        System.out.println("Hello " + user);
    }

}

Calling java class from Scala class

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package test.scala;

import test.java.Hello

object HelloScala {

  def helloScala() {
    val hello = new Hello()
    hello.helloUser("Scala")
  }
}


POM file:

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<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>Java_Scala_Project</groupId>
    <artifactId>Java_Scala_Project</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>2.10.4</version>
        </dependency>

    </dependencies>

    <!-- <repositories>
        <repository>
            <id>scala</id>
            <name>Scala Tools</name>
            <url>http://scala-tools.org/repo-releases/</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories> -->

    <pluginRepositories>
        <pluginRepository>
            <id>scala</id>
            <name>Scala Tools</name>
            <url>http://scala-tools.org/repo-releases/</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

    <build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.3</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.scala-tools</groupId>
                <artifactId>maven-scala-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.scala-tools</groupId>
                <artifactId>maven-scala-plugin</artifactId>
                <executions>
                    <execution>
                        <id>compile</id>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                        <phase>compile</phase>
                    </execution>
                    <execution>
                        <id>test-compile</id>
                        <goals>
                            <goal>testCompile</goal>
                        </goals>
                        <phase>test-compile</phase>
                    </execution>
                    <execution>
                        <phase>process-resources</phase>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

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