adding java files

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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>works.buddy.samples</groupId>
+    <artifactId>works-with-heroku</artifactId>
+    <version>1.0</version>
+    <packaging>war</packaging>
+    <dependencies>
+        <dependency>
+            <groupId>javax.servlet</groupId>
+            <artifactId>servlet-api</artifactId>
+            <version>2.5</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-all</artifactId>
+            <version>1.10.19</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <version>2.3</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals><goal>copy</goal></goals>
+                        <configuration>
+                            <artifactItems>
+                                <artifactItem>
+                                    <groupId>org.eclipse.jetty</groupId>
+                                    <artifactId>jetty-runner</artifactId>
+                                    <version>9.3.3.v20150827</version>
+                                    <destFileName>jetty-runner.jar</destFileName>
+                                </artifactItem>
+                            </artifactItems>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/works/buddy/samples/WorksWithHerokuServlet.java

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+package works.buddy.samples;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+public class WorksWithHerokuServlet extends HttpServlet {
+
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        response.setContentType("text/plain");
+        response.setStatus(404);
+        PrintWriter writer = response.getWriter();
+        writer.print("WEB APP WORKING");
+        writer.close();
+    }
+}

src/main/webapp/WEB-INF/web.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
+		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
+
+	<display-name>Works with Heroku</display-name>
+
+	<servlet>
+		<servlet-name>WorksWithHerokuServlet</servlet-name>
+		<servlet-class>works.buddy.samples.WorksWithHerokuServlet</servlet-class>
+	</servlet>
+
+	<servlet-mapping>
+		<servlet-name>WorksWithHerokuServlet</servlet-name>
+		<url-pattern>/</url-pattern>
+	</servlet-mapping>
+
+</web-app>

src/test/java/works/buddy/samples/WorksWithHerokuServletTest.java

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+package works.buddy.samples;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.ByteArrayOutputStream;
+import java.io.PrintWriter;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.when;
+
+public class WorksWithHerokuServletTest {
+
+    private WorksWithHerokuServlet servlet;
+
+    @Mock
+    private HttpServletRequest request;
+
+    @Mock
+    private HttpServletResponse response;
+
+    @Before
+    public void setUp() throws Exception {
+        MockitoAnnotations.initMocks(this);
+        servlet = new WorksWithHerokuServlet();
+    }
+
+    @Test
+    public void testDoGet() throws Exception {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        PrintWriter writer = new PrintWriter(out);
+        when(response.getWriter()).thenReturn(writer);
+
+        servlet.doGet(request, response);
+        assertEquals("WEB APP WORKING", new String( out.toByteArray(), "UTF-8"));
+    }
+}