[BAEL 1209] - Java RMI Files. (#3374)

* [BAEL 1209] - Java RMI Files.

* Added parent tag and deleted dependency tag for junit.

* Added java-rmi module.

* Removed duplicate java-lite module entry.

* Deleting this file as it is covered in test class.

* Spell check.

java-rmi/pom.xml

@@ -0,0 +1,20 @@
+<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.baeldung.rmi</groupId>
+  <artifactId>java-rmi</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <packaging>jar</packaging>
+  
+  <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+  </parent>
+  
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+  </properties>
+  
+</project>

java-rmi/src/main/java/com/baeldung/rmi/Message.java

@@ -0,0 +1,36 @@
+package com.baeldung.rmi;
+
+import java.io.Serializable;
+
+public class Message implements Serializable {
+	
+	private String messageText;
+	
+	private String contentType;
+	
+	public Message() {
+	}
+	
+	public Message(String messageText, String contentType) {
+		
+		this.messageText = messageText;
+		this.contentType = contentType;
+	}
+	
+	public String getMessageText() {
+		return messageText;
+	}
+
+	public void setMessageText(String messageText) {
+		this.messageText = messageText;
+	}
+
+	public String getContentType() {
+		return contentType;
+	}
+
+	public void setContentType(String contentType) {
+		this.contentType = contentType;
+	}
+	
+}

java-rmi/src/main/java/com/baeldung/rmi/MessengerService.java

@@ -0,0 +1,11 @@
+package com.baeldung.rmi;
+
+import java.rmi.Remote;
+import java.rmi.RemoteException;
+
+public interface MessengerService extends Remote {
+
+	public String sendMessage(String clientMessage) throws RemoteException;
+
+	public Message sendMessage(Message clientMessage) throws RemoteException;
+}

java-rmi/src/main/java/com/baeldung/rmi/MessengerServiceImpl.java

@@ -0,0 +1,37 @@
+package com.baeldung.rmi;
+
+import java.rmi.RemoteException;
+import java.rmi.registry.LocateRegistry;
+import java.rmi.registry.Registry;
+import java.rmi.server.UnicastRemoteObject;
+
+public class MessengerServiceImpl implements MessengerService {
+
+	public String sendMessage(String clientMessage) {
+		
+		String serverMessage = null;
+		if (clientMessage.equals("Client Message")) {
+			serverMessage = "Server Message";
+		}
+		
+		return serverMessage;
+	}
+	
+	public void createStubAndBind() throws RemoteException {
+		
+		MessengerService stub = (MessengerService) UnicastRemoteObject.exportObject((MessengerService) this, 0);
+		Registry registry = LocateRegistry.createRegistry(1099);
+		registry.rebind("MessengerService", stub);
+	}
+	
+	public Message sendMessage(Message clientMessage) throws RemoteException {
+		
+		Message serverMessage = null;
+		if (clientMessage.getMessageText().equals("Client Message")) {
+			serverMessage = new Message("Server Message", "text/plain");
+		}
+		
+		return serverMessage;
+	}
+	
+}

java-rmi/src/test/java/com/baeldung/rmi/JavaRMIIntegrationTest.java

@@ -0,0 +1,44 @@
+package com.baeldung.rmi;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import java.rmi.NotBoundException;
+import java.rmi.RemoteException;
+import java.rmi.registry.LocateRegistry;
+import java.rmi.registry.Registry;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+public class JavaRMIIntegrationTest {
+	
+	@BeforeClass
+	public static void whenRunServer_thenServerStarts() {
+		
+		try {
+			MessengerServiceImpl server = new MessengerServiceImpl();
+			server.createStubAndBind();
+		} catch (RemoteException e) {
+			fail("Exception Occurred");
+		}
+	}
+	
+	@Test
+	public void whenClientSendsMessageToServer_thenServerSendsResponseMessage() {
+		
+		try {
+			Registry registry = LocateRegistry.getRegistry();	
+			MessengerService server = (MessengerService) registry.lookup("MessengerService");			
+			String responseMessage = server.sendMessage("Client Message");		
+			
+			String expectedMessage = "Server Message";			
+			assertEquals(responseMessage, expectedMessage);
+		} catch (RemoteException e) {
+			fail("Exception Occurred");
+		} catch (NotBoundException nb) {
+			fail("Exception Occurred");
+		}
+	}
+	
+}

pom.xml

@@ -87,8 +87,9 @@
         <module>jackson</module>
         <!--         <module>persistence-modules/java-cassandra</module> -->
         <module>vavr</module>
-		<module>java-lite</module>
-	<module>java-vavr-stream</module>
+	      <module>java-lite</module>
+	      <module>java-rmi</module>	    
+	      <module>java-vavr-stream</module>
         <module>javax-servlets</module>
         <module>javaxval</module>
         <module>jaxb</module>