merge

apache-shiro/pom.xml

@@ -9,9 +9,9 @@
     <version>1.0-SNAPSHOT</version>
 
     <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>1.5.2.RELEASE</version>
     </parent>
 
     <properties>
@@ -21,6 +21,19 @@
     </properties>
 
     <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-freemarker</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.shiro</groupId>
+            <artifactId>shiro-spring-boot-web-starter</artifactId>
+            <version>${apache-shiro-core-version}</version>
+        </dependency>
         <dependency>
             <groupId>org.apache.shiro</groupId>
             <artifactId>shiro-core</artifactId>

apache-shiro/src/main/java/com/baeldung/ShiroSpringApplication.java

@@ -0,0 +1,45 @@
+package com.baeldung;
+
+import org.apache.shiro.realm.Realm;
+import org.apache.shiro.spring.web.config.DefaultShiroFilterChainDefinition;
+import org.apache.shiro.spring.web.config.ShiroFilterChainDefinition;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
+/**
+ * Created by smatt on 21/08/2017.
+ */
+@SpringBootApplication
+public class ShiroSpringApplication {
+
+    private static final transient Logger log = LoggerFactory.getLogger(ShiroSpringApplication.class);
+
+    public static void main(String... args) {
+        SpringApplication.run(ShiroSpringApplication.class, args);
+    }
+
+
+    @Bean
+    public Realm realm() {
+        return new MyCustomRealm();
+    }
+
+
+    @Bean
+    public ShiroFilterChainDefinition shiroFilterChainDefinition() {
+        DefaultShiroFilterChainDefinition filter
+          = new DefaultShiroFilterChainDefinition();
+
+        filter.addPathDefinition("/secure", "authc");
+        filter.addPathDefinition("/**", "anon");
+
+        return filter;
+    }
+
+
+
+
+}

apache-shiro/src/main/java/com/baeldung/controllers/ShiroSpringController.java

@@ -0,0 +1,105 @@
+package com.baeldung.controllers;
+
+import com.baeldung.models.UserCredentials;
+import org.apache.shiro.SecurityUtils;
+import org.apache.shiro.authc.AuthenticationException;
+import org.apache.shiro.authc.UsernamePasswordToken;
+import org.apache.shiro.subject.Subject;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.ModelMap;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.servlet.mvc.support.RedirectAttributes;
+
+import javax.servlet.http.HttpServletRequest;
+
+@Controller
+public class ShiroSpringController {
+
+
+
+    @GetMapping("/")
+    public String index() {
+       return "index";
+    }
+
+
+    @RequestMapping( value = "/login", method = {RequestMethod.GET, RequestMethod.POST})
+    public String login(HttpServletRequest req, UserCredentials cred, RedirectAttributes attr) {
+
+      if(req.getMethod().equals(RequestMethod.GET.toString())) {
+        return "login";
+      }
+      else {
+
+        Subject subject = SecurityUtils.getSubject();
+
+        if(!subject.isAuthenticated()) {
+          UsernamePasswordToken token = new UsernamePasswordToken(
+            cred.getUsername(), cred.getPassword(), cred.isRememberMe());
+          try {
+            subject.login(token);
+          } catch (AuthenticationException ae) {
+              ae.printStackTrace();
+              attr.addFlashAttribute("error", "Invalid Credentials");
+              return "redirect:/login";
+          }
+        }
+
+        return "redirect:/secure";
+      }
+    }
+
+
+    @GetMapping("/secure")
+    public String secure(ModelMap modelMap) {
+
+        Subject currentUser = SecurityUtils.getSubject();
+        String role = "", permission = "";
+
+        if(currentUser.hasRole("admin")) {
+            role = role  + "You are an Admin";
+        }
+        else if(currentUser.hasRole("editor")) {
+            role = role + "You are an Editor";
+        }
+        else if(currentUser.hasRole("author")) {
+            role = role + "You are an Author";
+        }
+
+        if(currentUser.isPermitted("articles:compose")) {
+            permission = permission + "You can compose an article, ";
+        } else {
+            permission = permission + "You are not permitted to compose an article!, ";
+        }
+
+        if(currentUser.isPermitted("articles:save")) {
+            permission = permission + "You can save articles, ";
+        } else {
+            permission = permission + "\nYou can not save articles, ";
+        }
+
+        if(currentUser.isPermitted("articles:publish")) {
+            permission = permission  + "\nYou can publish articles";
+        } else {
+            permission = permission + "\nYou can not publish articles";
+        }
+
+        modelMap.addAttribute("username", currentUser.getPrincipal());
+        modelMap.addAttribute("permission", permission);
+        modelMap.addAttribute("role", role);
+
+        return "secure";
+    }
+
+
+    @PostMapping("/logout")
+    public String logout() {
+       Subject subject = SecurityUtils.getSubject();
+       subject.logout();
+       return "redirect:/";
+    }
+
+}

apache-shiro/src/main/java/com/baeldung/models/UserCredentials.java

@@ -0,0 +1,40 @@
+package com.baeldung.models;
+
+public class UserCredentials {
+
+    private String username;
+    private String password;
+    private boolean rememberMe = false;
+
+    public UserCredentials() {}
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public boolean isRememberMe() {
+        return rememberMe;
+    }
+
+    public void setRememberMe(boolean rememberMe) {
+        this.rememberMe = rememberMe;
+    }
+
+    @Override
+    public String toString() {
+        return "username = " + getUsername()
+                + "\nrememberMe = " + isRememberMe();
+    }
+}

apache-shiro/src/main/resources/application.properties

@@ -0,0 +1,11 @@
+server.port=9000
+server.servlet-path=/
+server.context-path=/
+
+#shiro-spring-boot-config
+shiro.loginUrl = /login
+shiro.successUrl = /secure
+shiro.unauthorizedUrl = /login
+
+#freemarker
+spring.freemarker.suffix=.ftl

apache-shiro/src/main/resources/templates/index.ftl

@@ -0,0 +1,10 @@
+<html>
+<head>
+    <title>Index</title>
+</head>
+<body>
+    <h1>Welcome Guest!</h1>
+    <br>
+    <a href="/login">Login</a>
+</body>
+</html>

apache-shiro/src/main/resources/templates/login.ftl

@@ -0,0 +1,27 @@
+<html>
+<head>
+    <title>Login</title>
+</head>
+<body style="margin-left: 30px;">
+<h3>Login</h3>
+<br>
+<form action="/login" method="post">
+    <#if (error?length > 0)??>
+        <p style="color:darkred;">${error}</p>
+    <#else>
+    </#if>
+
+    <label for="username">Username</label>
+    <br>
+    <input type="text" name="username">
+    <br><br>
+    <label for="password">Password</label>
+    <br>
+    <input type="password" name="password">
+    <br><br>
+    <input type="checkbox" name="rememberMe"> Remember Me
+    <br><br>
+    <input type="submit" value="Submit">
+</form>
+</body>
+</html>

apache-shiro/src/main/resources/templates/secure.ftl

@@ -0,0 +1,15 @@
+<html>
+<head>
+    <title>Secure</title>
+</head>
+<body style="margin-left: 30px;">
+<h1>Welcome ${username}!</h1>
+<p><strong>Role</strong>: ${role}</p>
+<p><strong>Permissions</strong></p>
+<p>${permission}</p>
+<br>
+<form role="form" action="/logout" method="POST">
+   <input type="Submit" value="Logout" />
+</form>
+</body>
+</html>

core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithLock.java

@@ -3,11 +3,11 @@ package com.baeldung.concurrent.atomic;
 public class SafeCounterWithLock {
     private volatile int counter;
     
-    public int getValue() {
+    int getValue() {
         return counter;
     }
     
-    public synchronized void increment() {
+    synchronized void increment() {
         counter++;
     }
 }

core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithoutLock.java

@@ -5,11 +5,11 @@ import java.util.concurrent.atomic.AtomicInteger;
 public class SafeCounterWithoutLock {
     private final AtomicInteger counter = new AtomicInteger(0);
     
-    public int getValue() {
+    int getValue() {
         return counter.get();
     }
     
-    public void increment() {
+    void increment() {
         while(true) {
             int existingValue = getValue();
             int newValue = existingValue + 1;

core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/UnsafeCounter.java

@@ -1,13 +1,13 @@
 package com.baeldung.concurrent.atomic;
 
 public class UnsafeCounter {
-    int counter;
+    private int counter;
     
-    public int getValue() {
+    int getValue() {
         return counter;
     }
     
-    public void increment() {
+    void increment() {
         counter++;
     }
 }

core-java-concurrency/src/main/java/com/baeldung/threadlocal/Context.java

@@ -4,14 +4,14 @@ package com.baeldung.threadlocal;
 public class Context {
     private final String userName;
 
-    public Context(String userName) {
+    Context(String userName) {
         this.userName = userName;
     }
 
     @Override
     public String toString() {
         return "Context{" +
-                "userNameSecret='" + userName + '\'' +
-                '}';
+          "userNameSecret='" + userName + '\'' +
+          '}';
     }
 }

core-java-concurrency/src/main/java/com/baeldung/threadlocal/SharedMapWithUserContext.java

@@ -5,11 +5,11 @@ import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 public class SharedMapWithUserContext implements Runnable {
-    public final static Map<Integer, Context> userContextPerUserId = new ConcurrentHashMap<>();
+    final static Map<Integer, Context> userContextPerUserId = new ConcurrentHashMap<>();
     private final Integer userId;
     private UserRepository userRepository = new UserRepository();
 
-    public SharedMapWithUserContext(Integer userId) {
+    SharedMapWithUserContext(Integer userId) {
         this.userId = userId;
     }
 

core-java-concurrency/src/main/java/com/baeldung/threadlocal/ThreadLocalWithUserContext.java

@@ -10,7 +10,7 @@ public class ThreadLocalWithUserContext implements Runnable {
     private final Integer userId;
     private UserRepository userRepository = new UserRepository();
 
-    public ThreadLocalWithUserContext(Integer userId) {
+    ThreadLocalWithUserContext(Integer userId) {
         this.userId = userId;
     }
 

core-java-concurrency/src/main/java/com/baeldung/threadlocal/UserRepository.java

@@ -4,7 +4,7 @@ import java.util.UUID;
 
 
 public class UserRepository {
-    public String getUserNameForUserId(Integer userId) {
+    String getUserNameForUserId(Integer userId) {
         return UUID.randomUUID().toString();
     }
 }

core-java-concurrency/src/main/java/com/baeldung/threadpool/CountingTask.java

@@ -2,19 +2,21 @@ package com.baeldung.threadpool;
 
 import java.util.concurrent.ForkJoinTask;
 import java.util.concurrent.RecursiveTask;
-import java.util.stream.Collectors;
 
 public class CountingTask extends RecursiveTask<Integer> {
 
     private final TreeNode node;
 
-    public CountingTask(TreeNode node) {
+    CountingTask(TreeNode node) {
         this.node = node;
     }
 
     @Override
     protected Integer compute() {
-        return node.value + node.children.stream().map(childNode -> new CountingTask(childNode).fork()).collect(Collectors.summingInt(ForkJoinTask::join));
+        return node.getValue() + node.getChildren().stream()
+          .map(childNode -> new CountingTask(childNode).fork())
+          .mapToInt(ForkJoinTask::join)
+          .sum();
     }
 
 }

core-java-concurrency/src/main/java/com/baeldung/transferqueue/Consumer.java

@@ -11,10 +11,10 @@ public class Consumer implements Runnable {
 
     private final TransferQueue<String> transferQueue;
     private final String name;
-    private final int numberOfMessagesToConsume;
-    public final AtomicInteger numberOfConsumedMessages = new AtomicInteger();
+    final int numberOfMessagesToConsume;
+    final AtomicInteger numberOfConsumedMessages = new AtomicInteger();
 
-    public Consumer(TransferQueue<String> transferQueue, String name, int numberOfMessagesToConsume) {
+    Consumer(TransferQueue<String> transferQueue, String name, int numberOfMessagesToConsume) {
         this.transferQueue = transferQueue;
         this.name = name;
         this.numberOfMessagesToConsume = numberOfMessagesToConsume;

core-java-concurrency/src/main/java/com/baeldung/transferqueue/Producer.java

@@ -12,10 +12,10 @@ public class Producer implements Runnable {
 
     private final TransferQueue<String> transferQueue;
     private final String name;
-    private final Integer numberOfMessagesToProduce;
-    public final AtomicInteger numberOfProducedMessages = new AtomicInteger();
+    final Integer numberOfMessagesToProduce;
+    final AtomicInteger numberOfProducedMessages = new AtomicInteger();
 
-    public Producer(TransferQueue<String> transferQueue, String name, Integer numberOfMessagesToProduce) {
+    Producer(TransferQueue<String> transferQueue, String name, Integer numberOfMessagesToProduce) {
         this.transferQueue = transferQueue;
         this.name = name;
         this.numberOfMessagesToProduce = numberOfMessagesToProduce;

core-java-concurrency/src/test/java/com/baeldung/completablefuture/CompletableFutureLongRunningUnitTest.java

@@ -4,7 +4,11 @@ import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.concurrent.*;
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 

core-java-concurrency/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchExampleIntegrationTest.java

@@ -18,7 +18,9 @@ public class CountdownLatchExampleIntegrationTest {
         // Given
         List<String> outputScraper = Collections.synchronizedList(new ArrayList<>());
         CountDownLatch countDownLatch = new CountDownLatch(5);
-        List<Thread> workers = Stream.generate(() -> new Thread(new Worker(outputScraper, countDownLatch))).limit(5).collect(toList());
+        List<Thread> workers = Stream.generate(() -> new Thread(new Worker(outputScraper, countDownLatch)))
+          .limit(5)
+          .collect(toList());
 
         // When
         workers.forEach(Thread::start);
@@ -26,7 +28,6 @@ public class CountdownLatchExampleIntegrationTest {
         outputScraper.add("Latch released");
 
         // Then
-        outputScraper.forEach(Object::toString);
         assertThat(outputScraper).containsExactly("Counted down", "Counted down", "Counted down", "Counted down", "Counted down", "Latch released");
     }
 
@@ -35,7 +36,9 @@ public class CountdownLatchExampleIntegrationTest {
         // Given
         List<String> outputScraper = Collections.synchronizedList(new ArrayList<>());
         CountDownLatch countDownLatch = new CountDownLatch(5);
-        List<Thread> workers = Stream.generate(() -> new Thread(new BrokenWorker(outputScraper, countDownLatch))).limit(5).collect(toList());
+        List<Thread> workers = Stream.generate(() -> new Thread(new BrokenWorker(outputScraper, countDownLatch)))
+          .limit(5)
+          .collect(toList());
 
         // When
         workers.forEach(Thread::start);
@@ -63,7 +66,6 @@ public class CountdownLatchExampleIntegrationTest {
         outputScraper.add("Workers complete");
 
         // Then
-        outputScraper.forEach(Object::toString);
         assertThat(outputScraper).containsExactly("Workers ready", "Counted down", "Counted down", "Counted down", "Counted down", "Counted down", "Workers complete");
     }
 

core-java-concurrency/src/test/java/com/baeldung/concurrent/future/SquareCalculatorIntegrationTest.java

@@ -22,7 +22,6 @@ public class SquareCalculatorIntegrationTest {
 
     private static final Logger LOG = LoggerFactory.getLogger(SquareCalculatorIntegrationTest.class);
 
-
     @Rule
     public TestName name = new TestName();
 

core-java-concurrency/src/test/java/com/baeldung/concurrent/locks/SynchronizedHashMapWithRWLockManualTest.java

@@ -49,9 +49,7 @@ public class SynchronizedHashMapWithRWLockManualTest {
 
     private void executeReaderThreads(SynchronizedHashMapWithRWLock object, int threadCount, ExecutorService service) {
         for (int i = 0; i < threadCount; i++)
-            service.execute(() -> {
-                object.get("key" + threadCount);
-            });
+            service.execute(() -> object.get("key" + threadCount));
     }
 
 }

core-java-concurrency/src/test/java/com/baeldung/java/concurrentmap/ConcurrentMapNullKeyValueManualTest.java

@@ -12,7 +12,7 @@ import static org.junit.Assert.assertNull;
 
 public class ConcurrentMapNullKeyValueManualTest {
 
-    ConcurrentMap<String, Object> concurrentMap;
+    private ConcurrentMap<String, Object> concurrentMap;
 
     @Before
     public void setup() {

core-java-concurrency/src/test/java/com/baeldung/java/concurrentmap/ConcurrentNavigableMapManualTest.java

@@ -18,7 +18,7 @@ public class ConcurrentNavigableMapManualTest {
     public void givenSkipListMap_whenAccessInMultiThreads_thenOrderingStable() throws InterruptedException {
         NavigableMap<Integer, String> skipListMap = new ConcurrentSkipListMap<>();
 
-        updateMapConcurrently(skipListMap, 4);
+        updateMapConcurrently(skipListMap);
 
         Iterator<Integer> skipListIter = skipListMap.keySet().iterator();
         int previous = skipListIter.next();
@@ -28,9 +28,9 @@ public class ConcurrentNavigableMapManualTest {
         }
     }
 
-    private void updateMapConcurrently(NavigableMap<Integer, String> navigableMap, int concurrencyLevel) throws InterruptedException {
-        ExecutorService executorService = Executors.newFixedThreadPool(concurrencyLevel);
-        for (int i = 0; i < concurrencyLevel; i++) {
+    private void updateMapConcurrently(NavigableMap<Integer, String> navigableMap) throws InterruptedException {
+        ExecutorService executorService = Executors.newFixedThreadPool(4);
+        for (int i = 0; i < 4; i++) {
             executorService.execute(() -> {
                 ThreadLocalRandom random = ThreadLocalRandom.current();
                 for (int j = 0; j < 10000; j++) {
@@ -45,26 +45,26 @@ public class ConcurrentNavigableMapManualTest {
     @Test
     public void givenSkipListMap_whenNavConcurrently_thenCountCorrect() throws InterruptedException {
         NavigableMap<Integer, Integer> skipListMap = new ConcurrentSkipListMap<>();
-        int count = countMapElementByPollingFirstEntry(skipListMap, 10000, 4);
+        int count = countMapElementByPollingFirstEntry(skipListMap);
         assertEquals(10000 * 4, count);
     }
 
     @Test
     public void givenTreeMap_whenNavConcurrently_thenCountError() throws InterruptedException {
         NavigableMap<Integer, Integer> treeMap = new TreeMap<>();
-        int count = countMapElementByPollingFirstEntry(treeMap, 10000, 4);
+        int count = countMapElementByPollingFirstEntry(treeMap);
         assertNotEquals(10000 * 4, count);
     }
 
-    private int countMapElementByPollingFirstEntry(NavigableMap<Integer, Integer> navigableMap, int elementCount, int concurrencyLevel) throws InterruptedException {
-        for (int i = 0; i < elementCount * concurrencyLevel; i++) {
+    private int countMapElementByPollingFirstEntry(NavigableMap<Integer, Integer> navigableMap) throws InterruptedException {
+        for (int i = 0; i < 10000 * 4; i++) {
             navigableMap.put(i, i);
         }
         AtomicInteger counter = new AtomicInteger(0);
-        ExecutorService executorService = Executors.newFixedThreadPool(concurrencyLevel);
-        for (int j = 0; j < concurrencyLevel; j++) {
+        ExecutorService executorService = Executors.newFixedThreadPool(4);
+        for (int j = 0; j < 4; j++) {
             executorService.execute(() -> {
-                for (int i = 0; i < elementCount; i++) {
+                for (int i = 0; i < 10000; i++) {
                     if (navigableMap.pollFirstEntry() != null) {
                         counter.incrementAndGet();
                     }

core-java-concurrency/src/test/java/com/baeldung/java/concurrentmodification/ConcurrentModificationUnitTest.java

@@ -2,7 +2,6 @@ package com.baeldung.java.concurrentmodification;
 
 import org.junit.Test;
 
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.ConcurrentModificationException;
 import java.util.Iterator;
@@ -28,9 +27,9 @@ public class ConcurrentModificationUnitTest {
 
         List<Integer> integers = newArrayList(1, 2, 3);
 
-        for (Iterator<Integer> iterator = integers.iterator(); iterator.hasNext();) {
+        for (Iterator<Integer> iterator = integers.iterator(); iterator.hasNext(); ) {
             Integer integer = iterator.next();
-            if(integer == 2) {
+            if (integer == 2) {
                 iterator.remove();
             }
         }
@@ -45,7 +44,7 @@ public class ConcurrentModificationUnitTest {
         List<Integer> toRemove = newArrayList();
 
         for (Integer integer : integers) {
-            if(integer == 2) {
+            if (integer == 2) {
                 toRemove.add(integer);
             }
         }
@@ -69,10 +68,10 @@ public class ConcurrentModificationUnitTest {
         Collection<Integer> integers = newArrayList(1, 2, 3);
 
         List<String> collected = integers
-                .stream()
-                .filter(i -> i != 2)
-                .map(Object::toString)
-                .collect(toList());
+          .stream()
+          .filter(i -> i != 2)
+          .map(Object::toString)
+          .collect(toList());
 
         assertThat(collected).containsExactly("1", "3");
     }

core-java-concurrency/src/test/java/com/baeldung/java8/Java8ExecutorServiceIntegrationTest.java

@@ -72,7 +72,7 @@ public class Java8ExecutorServiceIntegrationTest {
 
         assertTrue(threadPoolExecutor.isShutdown());
         assertFalse(notExecutedTasks.isEmpty());
-        assertTrue(notExecutedTasks.size() > 0 && notExecutedTasks.size() < 98);
+        assertTrue(notExecutedTasks.size() < 98);
     }
 
     private List<Runnable> smartShutdown(ExecutorService executorService) {

core-java-concurrency/src/test/java/org/baeldung/java/streams/ThreadPoolInParallelStreamIntegrationTest.java

@@ -23,7 +23,10 @@ public class ThreadPoolInParallelStreamIntegrationTest {
         List<Long> aList = LongStream.rangeClosed(firstNum, lastNum).boxed().collect(Collectors.toList());
 
         ForkJoinPool customThreadPool = new ForkJoinPool(4);
-        long actualTotal = customThreadPool.submit(() -> aList.parallelStream().reduce(0L, Long::sum)).get();
+        long actualTotal = customThreadPool
+          .submit(() -> aList.parallelStream()
+            .reduce(0L, Long::sum))
+          .get();
 
         assertEquals((lastNum + firstNum) * lastNum / 2, actualTotal);
     }

core-java/README.md

@@ -119,3 +119,6 @@
 - [Guide to UUID in Java](http://www.baeldung.com/java-uuid)
 - [How to Get the Last Element of a Stream in Java?](http://www.baeldung.com/java-stream-last-element)
 - [Guide to Escaping Characters in Java RegExps](http://www.baeldung.com/java-regexp-escape-char)
+- [Period and Duration in Java](http://www.baeldung.com/java-period-duration)
+- [Introduction to the Java 8 Date/Time API](http://www.baeldung.com/java-8-date-time-intro)
+- [Migrating to the New Java 8 Date Time API](http://www.baeldung.com/migrating-to-java-8-date-time-api)

core-java/pom.xml

@@ -186,6 +186,16 @@
             <artifactId>fscontext</artifactId>
             <version>${fscontext.version}</version>
         </dependency>
+        <dependency>
+            <groupId>joda-time</groupId>
+            <artifactId>joda-time</artifactId>
+            <version>${joda-time.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.darwinsys</groupId>
+            <artifactId>hirondelle-date4j</artifactId>
+            <version>${hirondelle-date4j.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -408,6 +418,8 @@
         <grep4j.version>1.8.7</grep4j.version>
         <lombok.version>1.16.12</lombok.version>
         <fscontext.version>4.6-b01</fscontext.version>
+        <joda-time.version>2.9.9</joda-time.version>
+        <hirondelle-date4j.version>1.5.1</hirondelle-date4j.version>
 
         <!-- testing -->
         <org.hamcrest.version>1.3</org.hamcrest.version>
@@ -416,9 +428,9 @@
         <assertj.version>3.6.1</assertj.version>
         <avaitility.version>1.7.0</avaitility.version>
 
+
         <!-- maven plugins -->
         <maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
         <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
-
     </properties>
 </project>

core-java/src/main/java/com/baeldung/numberofdigits/Benchmarking.java

@@ -0,0 +1,131 @@
+package com.baeldung.numberofdigits;
+
+import static com.baeldung.designpatterns.util.LogerUtil.LOG;;
+
+public class Benchmarking {;
+
+    private static final int LOWER_BOUND = 1;
+    private static final int UPPER_BOUND = 999999999;
+
+    
+    public static void main(String[] args) {
+        LOG.info("Testing all methods...");
+        
+        long length = test_stringBasedSolution();
+        LOG.info("String Based Solution : " + length);
+        
+        length = test_logarithmicApproach();
+        LOG.info("Logarithmic Approach : " + length);
+        
+        length = test_repeatedMultiplication();
+        LOG.info("Repeated Multiplication : " + length);
+        
+        length = test_shiftOperators();
+        LOG.info("Shift Operators : " + length);
+        
+        length = test_dividingWithPowersOf2();
+        LOG.info("Dividing with Powers of 2 : " + length);
+        
+        length = test_divideAndConquer();
+        LOG.info("Divide And Conquer : " + length);
+
+    }
+
+    private static long test_stringBasedSolution() {
+        
+        long startTime, stopTime, elapsedTime;
+        startTime = System.currentTimeMillis();
+
+        int total = 0;
+        for (int i = LOWER_BOUND; i <= UPPER_BOUND; i++) {
+            total += NumberOfDigits.stringBasedSolution(i);
+        }
+
+        stopTime = System.currentTimeMillis();
+        elapsedTime = stopTime - startTime;
+        
+        return elapsedTime;
+    }
+
+    private static long test_logarithmicApproach() {
+        
+        long startTime, stopTime, elapsedTime;
+        startTime = System.currentTimeMillis();
+
+        int total = 0;
+        for (int i = LOWER_BOUND; i <= UPPER_BOUND; i++) {
+            total += NumberOfDigits.logarithmicApproach(i);
+        }
+
+        stopTime = System.currentTimeMillis();
+        elapsedTime = stopTime - startTime;
+        
+        return elapsedTime;
+    }
+
+    private static long test_repeatedMultiplication() {
+        
+        long startTime, stopTime, elapsedTime;
+        startTime = System.currentTimeMillis();
+
+        int total = 0;
+        for (int i = LOWER_BOUND; i <= UPPER_BOUND; i++) {
+            total += NumberOfDigits.repeatedMultiplication(i);
+        }
+
+        stopTime = System.currentTimeMillis();
+        elapsedTime = stopTime - startTime;
+        
+        return elapsedTime;
+    }
+
+    private static long test_shiftOperators() {
+        
+        long startTime, stopTime, elapsedTime;
+        startTime = System.currentTimeMillis();
+
+        int total = 0;
+        for (int i = LOWER_BOUND; i <= UPPER_BOUND; i++) {
+            total += NumberOfDigits.shiftOperators(i);
+        }
+
+        stopTime = System.currentTimeMillis();
+        elapsedTime = stopTime - startTime;
+        
+        return elapsedTime;
+    }
+
+    private static long test_dividingWithPowersOf2() {
+        
+        long startTime, stopTime, elapsedTime;
+        startTime = System.currentTimeMillis();
+
+        int total = 0;
+        for (int i = LOWER_BOUND; i <= UPPER_BOUND; i++) {
+            total += NumberOfDigits.dividingWithPowersOf2(i);
+        }
+
+        stopTime = System.currentTimeMillis();
+        elapsedTime = stopTime - startTime;
+        
+        return elapsedTime;
+    }
+
+    private static long test_divideAndConquer() {
+        
+        long startTime, stopTime, elapsedTime;
+        startTime = System.currentTimeMillis();
+
+        int total = 0;
+        for (int i = LOWER_BOUND; i <= UPPER_BOUND; i++) {
+            total += NumberOfDigits.divideAndConquer(i);
+        }
+
+        stopTime = System.currentTimeMillis();
+        elapsedTime = stopTime - startTime;
+        
+        return elapsedTime;
+    }
+    
+    
+}

core-java/src/main/java/com/baeldung/numberofdigits/NumberOfDigits.java

@@ -0,0 +1,97 @@
+package com.baeldung.numberofdigits;
+
+public class NumberOfDigits {
+    public static int stringBasedSolution(int number) {
+        int length = String.valueOf(number).length();
+        return length;
+    }
+    
+    public static int logarithmicApproach(int number) {
+        int length = (int) Math.log10(number) + 1;
+        return length;
+    }
+    
+    public static int repeatedMultiplication(int number) {
+        int length = 0;
+        long temp = 1;
+        while(temp <= number) {
+            length++;
+            temp *= 10;
+        }
+        return length;
+    }
+
+    public static int shiftOperators(int number) {
+        int length = 0;
+        long temp = 1;
+        while(temp <= number) {
+            length++;
+            temp = (temp << 3) + (temp << 1);
+        }
+        return length;
+    }
+    
+    public static int dividingWithPowersOf2(int number) {
+        int length = 1;
+        if (number >= 100000000) {
+            length += 8;
+            number /= 100000000;
+        }
+        if (number >= 10000) {
+            length += 4;
+            number /= 10000;
+        }
+        if (number >= 100) {
+            length += 2;
+            number /= 100;
+        }
+        if (number >= 10) {
+            length += 1;
+        }
+        return length;
+    }
+    
+    public static int divideAndConquer(int number) {
+        if (number < 100000){
+            // 5 digits or less
+            if (number < 100){
+                // 1 or 2
+                if (number < 10)
+                    return 1;
+                else
+                    return 2;
+            }else{
+                // 3 to 5 digits
+                if (number < 1000)
+                    return 3;
+                else{
+                    // 4 or 5 digits
+                    if (number < 10000)
+                        return 4;
+                    else
+                        return 5;
+                }
+            }
+        } else {
+            // 6 digits or more
+            if (number < 10000000) {
+                // 6 or 7 digits
+                if (number < 1000000)
+                    return 6;
+                else
+                    return 7;
+            } else {
+                // 8 to 10 digits
+                if (number < 100000000)
+                    return 8;
+                else {
+                    // 9 or 10 digits
+                    if (number < 1000000000)
+                        return 9;
+                    else
+                        return 10;
+                }
+            }
+        }
+    }
+}

core-java/src/main/java/com/baeldung/numberofdigits/NumberOfDigitsDriver.java

@@ -0,0 +1,27 @@
+package com.baeldung.numberofdigits;
+
+import static com.baeldung.designpatterns.util.LogerUtil.LOG;
+
+public class NumberOfDigitsDriver {
+    public static void main(String[] args) {
+        LOG.info("Testing all methods...");
+        
+        long length = NumberOfDigits.stringBasedSolution(602);
+        LOG.info("String Based Solution : " + length);
+        
+        length = NumberOfDigits.logarithmicApproach(602);
+        LOG.info("Logarithmic Approach : " + length);
+        
+        length = NumberOfDigits.repeatedMultiplication(602);
+        LOG.info("Repeated Multiplication : " + length);
+        
+        length = NumberOfDigits.shiftOperators(602);
+        LOG.info("Shift Operators : " + length);
+        
+        length = NumberOfDigits.dividingWithPowersOf2(602);
+        LOG.info("Dividing with Powers of 2 : " + length);
+        
+        length = NumberOfDigits.divideAndConquer(602);
+        LOG.info("Divide And Conquer : " + length);
+    }
+}

core-java/src/test/java/com/baeldung/DateDiffUnitTest.java

@@ -0,0 +1,82 @@
+package com.baeldung;
+
+import org.junit.Test;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.time.Duration;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.util.Date;
+import java.util.Locale;
+import java.util.TimeZone;
+import java.util.concurrent.TimeUnit;
+
+import static org.junit.Assert.assertEquals;
+
+public class DateDiffUnitTest {
+
+    @Test
+    public void givenTwoDatesBeforeJava8_whenDifferentiating_thenWeGetSix() throws ParseException {
+        SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy", Locale.ENGLISH);
+        Date firstDate = sdf.parse("06/24/2017");
+        Date secondDate = sdf.parse("06/30/2017");
+
+        long diffInMillies = Math.abs(secondDate.getTime() - firstDate.getTime());
+        long diff = TimeUnit.DAYS.convert(diffInMillies, TimeUnit.MILLISECONDS);
+
+        assertEquals(diff, 6);
+    }
+
+    @Test
+    public void givenTwoDatesInJava8_whenDifferentiating_thenWeGetSix() {
+        LocalDate now = LocalDate.now();
+        LocalDate sixDaysBehind = now.minusDays(6);
+
+        Duration duration = Duration.between(now, sixDaysBehind);
+        long diff = Math.abs(duration.toDays());
+
+        assertEquals(diff, 6);
+    }
+
+    @Test
+    public void givenTwoDateTimesInJava8_whenDifferentiating_thenWeGetSix() {
+        LocalDateTime now = LocalDateTime.now();
+        LocalDateTime sixMinutesBehind = now.minusMinutes(6);
+
+        Duration duration = Duration.between(now, sixMinutesBehind);
+        long diff = Math.abs(duration.toMinutes());
+
+        assertEquals(diff, 6);
+    }
+
+    @Test
+    public void givenTwoDatesInJodaTime_whenDifferentiating_thenWeGetSix() {
+        org.joda.time.LocalDate now = org.joda.time.LocalDate.now();
+        org.joda.time.LocalDate sixDaysBehind = now.minusDays(6);
+
+        org.joda.time.Period period = new org.joda.time.Period(now, sixDaysBehind);
+        long diff = Math.abs(period.getDays());
+
+        assertEquals(diff, 6);
+    }
+
+    @Test
+    public void givenTwoDateTimesInJodaTime_whenDifferentiating_thenWeGetSix() {
+        org.joda.time.LocalDateTime now = org.joda.time.LocalDateTime.now();
+        org.joda.time.LocalDateTime sixMinutesBehind = now.minusMinutes(6);
+
+        org.joda.time.Period period = new org.joda.time.Period(now, sixMinutesBehind);
+        long diff = Math.abs(period.getDays());
+    }
+
+    @Test
+    public void givenTwoDatesInDate4j_whenDifferentiating_thenWeGetSix() {
+        hirondelle.date4j.DateTime now = hirondelle.date4j.DateTime.now(TimeZone.getDefault());
+        hirondelle.date4j.DateTime sixDaysBehind = now.minusDays(6);
+
+        long diff = Math.abs(now.numDaysFrom(sixDaysBehind));
+
+        assertEquals(diff, 6);
+    }
+}

core-java/src/test/java/com/baeldung/numberofdigits/NumberOfDigitsIntegrationTest.java

@@ -0,0 +1,100 @@
+package com.baeldung.numberofdigits;
+
+import org.junit.Assert;
+import org.junit.Assume;
+import org.junit.experimental.theories.DataPoints;
+import org.junit.experimental.theories.Theories;
+import org.junit.experimental.theories.Theory;
+import org.junit.runner.RunWith;
+
+@RunWith(Theories.class)
+public class NumberOfDigitsIntegrationTest {
+
+    @DataPoints
+    public static int[][] lowestIntegers()
+    {
+      return new int[][]{
+          {1, 1}, 
+          {2, 10}, 
+          {3, 100}, 
+          {4, 1000}, 
+          {5, 10000}, 
+          {6, 100000}, 
+          {7, 1000000}, 
+          {8, 10000000}, 
+          {9, 100000000}, 
+          {10, 1000000000}
+      };
+    }
+    
+    @DataPoints
+    public static int[][] highestIntegers()
+    {
+      return new int[][]{
+          {1, 9}, 
+          {2, 99}, 
+          {3, 999}, 
+          {4, 9999}, 
+          {5, 99999}, 
+          {6, 999999}, 
+          {7, 9999999}, 
+          {8, 99999999}, 
+          {9, 999999999}, 
+          {10, Integer.MAX_VALUE}
+      };
+    }
+    
+    @DataPoints
+    public static int[][] randomIntegers()
+    {
+      return new int[][]{
+          {1, 1}, 
+          {2, 14}, 
+          {3, 549}, 
+          {4, 1136}, 
+          {5, 25340}, 
+          {6, 134321}, 
+          {7, 1435432}, 
+          {8, 54234129}, 
+          {9, 113683912}, 
+          {10, 1534031982}
+      };
+    }
+
+    @Theory
+    public void givenDataPoints_whenStringBasedSolutionInvoked_thenAllPointsMatch(final int[] entry) {
+        Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
+        Assert.assertEquals(entry[0], NumberOfDigits.stringBasedSolution(entry[1]));
+    }
+
+    @Theory
+    public void givenDataPoints_whenLogarithmicApproachInvoked_thenAllPointsMatch(final int[] entry) {
+        Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
+        Assert.assertEquals(entry[0], NumberOfDigits.logarithmicApproach(entry[1]));
+    }
+
+    @Theory
+    public void givenDataPoints_whenRepeatedMultiplicationInvoked_thenAllPointsMatch(final int[] entry) {
+        Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
+        Assert.assertEquals(entry[0], NumberOfDigits.repeatedMultiplication(entry[1]));
+    }
+
+    @Theory
+    public void givenDataPoints_whenShiftOperatorsInvoked_thenAllPointsMatch(final int[] entry) {
+        Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
+        Assert.assertEquals(entry[0], NumberOfDigits.shiftOperators(entry[1]));
+    }
+
+    @Theory
+    public void givenDataPoints_whenDividingWithPowersOf2Invoked_thenAllPointsMatch(final int[] entry) {
+        Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
+        Assert.assertEquals(entry[0], NumberOfDigits.dividingWithPowersOf2(entry[1]));
+    }
+
+    @Theory
+    public void givenDataPoints_whenDivideAndConquerInvoked_thenAllPointsMatch(final int[] entry) {
+        Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
+        Assert.assertEquals(entry[0], NumberOfDigits.divideAndConquer(entry[1]));
+    }
+    
+}

java-difference-date/README.md

@@ -0,0 +1,5 @@
+## Relevant articles:
+
+- [Period and Duration in Java](http://www.baeldung.com/java-period-duration)
+- [Introduction to the Java 8 Date/Time API](http://www.baeldung.com/java-8-date-time-intro)
+- [Migrating to the New Java 8 Date Time API](http://www.baeldung.com/migrating-to-java-8-date-time-api)

java-difference-date/pom.xml

@@ -0,0 +1,58 @@
+<?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/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>com.baeldung</groupId>
+	<artifactId>java-difference-date</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<packaging>jar</packaging>
+
+	<name>java-difference-date</name>
+	<description>Difference between two dates in java</description>
+
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-modules</artifactId>
+		<version>1.0.0-SNAPSHOT</version>
+	</parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>joda-time</groupId>
+            <artifactId>joda-time</artifactId>
+            <version>${joda-time.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.darwinsys</groupId>
+            <artifactId>hirondelle-date4j</artifactId>
+            <version>${hirondelle-date4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <target>1.8</target>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <java.version>1.8</java.version>
+        <junit.version>4.12</junit.version>
+        <joda-time.version>2.9.9</joda-time.version>
+        <hirondelle-date4j.version>1.5.1</hirondelle-date4j.version>
+    </properties>
+</project>

java-difference-date/src/test/java/com/baeldung/DateDiffTest.java

@@ -0,0 +1,61 @@
+package com.baeldung;
+
+import org.joda.time.DateTime;
+import org.junit.Test;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.time.Duration;
+import java.time.ZonedDateTime;
+import java.util.Date;
+import java.util.Locale;
+import java.util.TimeZone;
+import java.util.concurrent.TimeUnit;
+
+import static org.junit.Assert.assertEquals;
+
+public class DateDiffTest {
+    @Test
+    public void givenTwoDatesBeforeJava8_whenDifferentiating_thenWeGetSix() throws ParseException {
+        SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy", Locale.ENGLISH);
+        Date firstDate = sdf.parse("06/24/2017");
+        Date secondDate = sdf.parse("06/30/2017");
+
+        long diffInMillies = Math.abs(secondDate.getTime() - firstDate.getTime());
+        long diff = TimeUnit.DAYS.convert(diffInMillies, TimeUnit.MILLISECONDS);
+
+        assertEquals(diff, 6);
+    }
+
+    @Test
+    public void givenTwoDatesInJava8_whenDifferentiating_thenWeGetSix() {
+        ZonedDateTime now = ZonedDateTime.now();
+        ZonedDateTime sixDaysBehind = now.minusDays(6);
+
+        Duration duration = Duration.between(now, sixDaysBehind);
+        long diff = Math.abs(duration.toDays());
+
+        assertEquals(diff, 6);
+    }
+
+    @Test
+    public void givenTwoDatesInJodaTime_whenDifferentiating_thenWeGetSix() {
+        DateTime now = DateTime.now();
+        DateTime sixDaysBehind = now.minusDays(6);
+
+        org.joda.time.Duration duration = new org.joda.time.Duration(now, sixDaysBehind);
+        long diff = Math.abs(duration.getStandardDays());
+
+        assertEquals(diff, 6);
+    }
+
+    @Test
+    public void givenTwoDatesInDate4j_whenDifferentiating_thenWeGetSix() {
+        hirondelle.date4j.DateTime now = hirondelle.date4j.DateTime.now(TimeZone.getDefault());
+        hirondelle.date4j.DateTime sixDaysBehind = now.minusDays(6);
+
+        long diff = Math.abs(now.numDaysFrom(sixDaysBehind));
+
+        assertEquals(diff, 6);
+    }
+}

pom.xml

@@ -43,6 +43,7 @@
         <module>cdi</module>
         <!-- <module>core-java-9</module> -->
         <module>core-java</module>
+        <module>core-java-concurrency</module>
         <module>couchbase-sdk</module>
 
         <module>deltaspike</module>

spring-5/src/main/java/com/baeldung/functional/MyService.java

@@ -0,0 +1,13 @@
+package com.baeldung.functional;
+
+import java.util.Random;
+
+import org.springframework.stereotype.Component;
+
+public class MyService {
+
+    public int getRandomNumber(){
+        return (new Random().nextInt(10));
+    }
+    
+}

spring-5/src/test/java/com/baeldung/functional/BeanRegistrationTest.java

@@ -0,0 +1,42 @@
+package com.baeldung.functional;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.web.context.support.GenericWebApplicationContext;
+
+import com.baeldung.Spring5Application;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(classes = Spring5Application.class)
+public class BeanRegistrationTest {
+
+    @Autowired
+    private GenericWebApplicationContext context;
+
+    @Test
+    public void whenRegisterBean_thenOk() {
+        context.registerBean(MyService.class, () -> new MyService());
+        MyService myService = (MyService) context.getBean("com.baeldung.functional.MyService");
+        assertTrue(myService.getRandomNumber() < 10);
+    }
+
+    @Test
+    public void whenRegisterBeanWithName_thenOk() {
+        context.registerBean("mySecondService", MyService.class, () -> new MyService());
+        MyService mySecondService = (MyService) context.getBean("mySecondService");
+        assertTrue(mySecondService.getRandomNumber() < 10);
+    }
+
+    @Test
+    public void whenRegisterBeanWithCallback_thenOk() {
+        context.registerBean("myCallbackService", MyService.class, () -> new MyService(), bd -> bd.setAutowireCandidate(false));
+        MyService myCallbackService = (MyService) context.getBean("myCallbackService");
+        assertTrue(myCallbackService.getRandomNumber() < 10);
+    }
+
+}

spring-mvc-kotlin/pom.xml

@@ -35,9 +35,15 @@
             <version>4.3.10.RELEASE</version>
         </dependency>
         <dependency>
-            <groupId>javax.servlet</groupId>
-            <artifactId>jstl</artifactId>
-            <version>1.2</version>
+            <groupId>org.thymeleaf</groupId>
+            <artifactId>thymeleaf</artifactId>
+            <version>3.0.7.RELEASE</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.thymeleaf</groupId>
+            <artifactId>thymeleaf-spring4</artifactId>
+            <version>3.0.7.RELEASE</version>
         </dependency>
     </dependencies>
 

spring-mvc-kotlin/src/main/kotlin/com/baeldung/kotlin/mvc/ApplicationWebConfig.kt

@@ -1,13 +1,16 @@
 package com.baeldung.kotlin.mvc
 
+import org.springframework.context.ApplicationContext
+import org.springframework.context.ApplicationContextAware
 import org.springframework.context.annotation.Bean
 import org.springframework.context.annotation.Configuration
-import org.springframework.web.servlet.ViewResolver
 import org.springframework.web.servlet.config.annotation.EnableWebMvc
 import org.springframework.web.servlet.config.annotation.ViewControllerRegistry
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter
-import org.springframework.web.servlet.view.InternalResourceViewResolver
-import org.springframework.web.servlet.view.JstlView
+import org.thymeleaf.spring4.SpringTemplateEngine
+import org.thymeleaf.spring4.templateresolver.SpringResourceTemplateResolver
+import org.thymeleaf.spring4.view.ThymeleafViewResolver
+import org.thymeleaf.templatemode.TemplateMode
 
 
 
@@ -15,7 +18,13 @@ import org.springframework.web.servlet.view.JstlView
 
 @EnableWebMvc
 @Configuration
-open class ApplicationWebConfig: WebMvcConfigurerAdapter() {
+open class ApplicationWebConfig: WebMvcConfigurerAdapter(), ApplicationContextAware {
+
+    private var applicationContext: ApplicationContext? = null
+
+    override fun setApplicationContext(applicationContext: ApplicationContext?) {
+        this.applicationContext = applicationContext
+    }
 
     override fun addViewControllers(registry: ViewControllerRegistry?) {
         super.addViewControllers(registry)
@@ -24,14 +33,28 @@ open class ApplicationWebConfig: WebMvcConfigurerAdapter() {
     }
 
     @Bean
-    open fun viewResolver(): ViewResolver {
-        val bean = InternalResourceViewResolver()
+    open fun templateResolver(): SpringResourceTemplateResolver {
+        val templateResolver = SpringResourceTemplateResolver()
+        templateResolver.prefix = "/WEB-INF/view/"
+        templateResolver.suffix = ".html"
+        templateResolver.templateMode = TemplateMode.HTML
+        templateResolver.setApplicationContext(this.applicationContext);
+        return templateResolver
+    }
 
-        bean.setViewClass(JstlView::class.java)
-        bean.setPrefix("/WEB-INF/view/")
-        bean.setSuffix(".jsp")
+    @Bean
+    open fun templateEngine(): SpringTemplateEngine {
+        val templateEngine = SpringTemplateEngine()
+        templateEngine.setTemplateResolver(templateResolver())
+        return templateEngine
+    }
 
-        return bean
+    @Bean
+    open fun viewResolver(): ThymeleafViewResolver {
+        val viewResolver = ThymeleafViewResolver()
+        viewResolver.templateEngine = templateEngine()
+        viewResolver.order = 1
+        return viewResolver
     }
 
 }

spring-mvc-kotlin/src/main/webapp/WEB-INF/spring-web-config.xml

@@ -12,13 +12,26 @@
 
     <context:component-scan base-package="com.baeldung.kotlin.mvc" />
 
-    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
-        <property name="prefix" value="/WEB-INF/view/"/>
-        <property name="suffix" value=".jsp"/>
-    </bean>
-
     <mvc:view-controller path="/welcome.html"/>
 
     <mvc:annotation-driven />
 
+    <bean id="templateResolver"
+          class="org.thymeleaf.spring4.templateresolver.SpringResourceTemplateResolver">
+        <property name="prefix" value="/WEB-INF/view/" />
+        <property name="suffix" value=".html" />
+        <property name="templateMode" value="HTML" />
+    </bean>
+
+    <bean id="templateEngine"
+          class="org.thymeleaf.spring4.SpringTemplateEngine">
+        <property name="templateResolver" ref="templateResolver" />
+    </bean>
+
+
+    <bean class="org.thymeleaf.spring4.view.ThymeleafViewResolver">
+        <property name="templateEngine" ref="templateEngine" />
+        <property name="order" value="1" />
+    </bean>
+
 </beans>

vavr/pom.xml

@@ -40,6 +40,13 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
         </dependency>
+        
+        <dependency>
+    <groupId>org.awaitility</groupId>
+    <artifactId>awaitility</artifactId>
+    <version>${awaitility.version}</version>
+    <scope>test</scope>
+</dependency>
     </dependencies>
 	
     <repositories>
@@ -69,6 +76,7 @@
         <java.version>1.8</java.version>
         <vavr.version>0.9.0</vavr.version>
         <junit.version>4.12</junit.version>
+        <awaitility.version>3.0.0</awaitility.version>
     </properties>
 
     <build>

vavr/src/test/java/com/baeldung/vavr/future/FutureUnitTest.java

@@ -0,0 +1,203 @@
+package com.baeldung.vavr.future;
+
+import static io.vavr.API.$;
+import static io.vavr.API.Case;
+import static io.vavr.API.Match;
+import static io.vavr.Predicates.exists;
+import static io.vavr.Predicates.forAll;
+import static org.awaitility.Awaitility.await;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.util.concurrent.CancellationException;
+import java.util.function.Predicate;
+
+import org.junit.Test;
+
+import io.vavr.collection.List;
+import io.vavr.concurrent.Future;
+
+public class FutureUnitTest {
+
+    private final String SUCCESS = "Success";
+    private final String FAILURE = "Failure";
+
+    @Test
+    public void givenFunctionReturnInteger_WhenCallWithFuture_ShouldReturnFunctionValue() {
+        Future<Integer> future = Future.of(() -> 1);
+
+        assertEquals(1, future.get()
+            .intValue());
+    }
+
+    @Test
+    public void givenFunctionGetRemoteHttpResourceAsString_WhenCallSuccessWithFuture_ShouldReturnContentValueAsString() {
+        String url = "http://resource";
+        String content = "Content from " + url;
+        Future<String> future = Future.of(() -> getResource(url));
+
+        assertEquals(content, future.get());
+    }
+
+    @Test
+    public void givenFunctionThrowException_WhenCallWithFuture_ShouldReturnFailure() {
+        Future<String> future = Future.of(() -> getResourceThrowException(""));
+        future.await();
+
+        assertTrue(future.isFailure());
+    }
+
+    @Test
+    public void givenAFutureReturnZero_WhenCheckFutureWithExistEvenValue_ShouldReturnRight() {
+        Future<Integer> future = Future.of(() -> 2);
+        boolean result = future.exists(i -> i % 2 == 0);
+
+        assertTrue(result);
+    }
+
+    @Test
+    public void givenFunction_WhenCallWithFutureAndRegisterConsumerForSuccess_ShouldCallConsumerToStoreValue() {
+        final int[] store = new int[] { 0 };
+        Future<Integer> future = Future.of(() -> 1);
+        future.onSuccess(i -> {
+            store[0] = i;
+        });
+        await().until(() -> store[0] == 1);
+    }
+
+    @Test
+    public void givenFunctionThrowException_WhenCallWithFutureAndRegisterConsumerForFailer_ShouldCallConsumerToStoreException() {
+        final Throwable[] store = new Throwable[] { null };
+        Future<String> future = Future.of(() -> getResourceThrowException(""));
+        future.onFailure(err -> store[0] = err);
+        await().until(() -> RuntimeException.class.isInstance(store[0]));
+    }
+
+    @Test
+    public void givenAFuture_WhenAddAndThenConsumer_ShouldCallConsumerWithResultOfFutureAction() {
+        int[] store1 = new int[1];
+        int[] store2 = new int[1];
+        Future<Integer> future = Future.of(() -> 1);
+        Future<Integer> andThenFuture = future.andThen(i -> store1[0] = i.get() + 1)
+            .andThen(i -> store2[0] = store1[0] + 1);
+        andThenFuture.await();
+
+        assertEquals(2, store1[0]);
+        assertEquals(3, store2[0]);
+    }
+
+    @Test
+    public void givenAFailureFuture_WhenCallOrElseFunction_ShouldReturnNewFuture() {
+        Future<Integer> future = Future.failed(new RuntimeException());
+        Future<Integer> future2 = future.orElse(Future.of(() -> 2));
+
+        assertEquals(2, future2.get()
+            .intValue());
+    }
+
+    @Test(expected = CancellationException.class)
+    public void givenAFuture_WhenCallCancel_ShouldReturnCancellationException() {
+        long waitTime = 1000;
+        Future<Integer> future = Future.of(() -> {
+            Thread.sleep(waitTime);
+            return 1;
+        });
+        future.cancel();
+        future.await();
+        future.get();
+    }
+
+    @Test
+    public void givenAFuture_WhenCallFallBackWithSuccessFuture_ShouldReturnFutureResult() {
+        String expectedResult = "take this";
+        Future<String> future = Future.of(() -> expectedResult);
+        Future<String> secondFuture = Future.of(() -> "take that");
+        Future<String> futureResult = future.fallbackTo(secondFuture);
+        futureResult.await();
+
+        assertEquals(expectedResult, futureResult.get());
+    }
+
+    @Test
+    public void givenAFuture_WhenCallFallBackWithFailureFuture_ShouldReturnValueOfFallBackFuture() {
+        String expectedResult = "take that";
+        Future<String> future = Future.failed(new RuntimeException());
+        Future<String> fallbackFuture = Future.of(() -> expectedResult);
+        Future<String> futureResult = future.fallbackTo(fallbackFuture);
+        futureResult.await();
+
+        assertEquals(expectedResult, futureResult.get());
+    }
+
+    @Test
+    public void givenGetResourceWithFuture_WhenWaitAndMatchWithPredicate_ShouldReturnSuccess() {
+        String url = "http://resource";
+        Future<String> future = Future.of(() -> getResource(url));
+        future.await();
+        String s = Match(future).of(Case($(future0 -> future0.isSuccess()), SUCCESS), Case($(), FAILURE));
+
+        assertEquals(SUCCESS, s);
+    }
+
+    @Test
+    public void givenAFailedFuture_WhenWaitAndMatchWithPredicateCheckSuccess_ShouldReturnFailed() {
+        Future<Integer> future = Future.failed(new RuntimeException());
+        future.await();
+        String s = Match(future).of(Case($(future0 -> future0.isSuccess()), SUCCESS), Case($(), FAILURE));
+
+        assertEquals(FAILURE, s);
+    }
+
+    @Test
+    public void givenAFuture_WhenMatchWithFuturePredicate_ShouldReturnSuccess() {
+        Future<Integer> future = Future.of(() -> {
+            Thread.sleep(10);
+            return 1;
+        });
+        Predicate<Future<Integer>> predicate = f -> f.exists(i -> i % 2 == 1);
+        String s = Match(future).of(Case($(predicate), "Even"), Case($(), "Odd"));
+
+        assertEquals("Even", s);
+    }
+
+    @Test
+    public void givenAListOfFutureReturnFist3Integers_WhenMatchWithExistEvenNumberPredicate_ShouldReturnSuccess() {
+        List<Future<Integer>> futures = getFutureOfFirst3Number();
+        Predicate<Future<Integer>> predicate0 = future -> future.exists(i -> i % 2 == 0);
+        String s = Match(futures).of(Case($(exists(predicate0)), "Even"), Case($(), "Odd"));
+
+        assertEquals("Even", s);
+    }
+
+    @Test
+    public void givenAListOfFutureReturnFist3Integers_WhenMatchWithForAllNumberBiggerThanZeroPredicate_ShouldReturnSuccess() {
+        List<Future<Integer>> futures = getFutureOfFirst3Number();
+        Predicate<Future<Integer>> predicate0 = future -> future.exists(i -> i > 0);
+        String s = Match(futures).of(Case($(forAll(predicate0)), "Positive numbers"), Case($(), "None"));
+
+        assertEquals("Positive numbers", s);
+    }
+
+    @Test
+    public void givenAListOfFutureReturnFist3Integers_WhenMatchWithForAllNumberSmallerThanZeroPredicate_ShouldReturnFailed() {
+        List<Future<Integer>> futures = getFutureOfFirst3Number();
+        Predicate<Future<Integer>> predicate0 = future -> future.exists(i -> i < 0);
+        String s = Match(futures).of(Case($(forAll(predicate0)), "Negative numbers"), Case($(), "None"));
+
+        assertEquals("None", s);
+    }
+
+    private String getResource(String url) throws InterruptedException {
+        Thread.sleep(10);
+        return "Content from " + url;
+    }
+
+    private String getResourceThrowException(String url) {
+        throw new RuntimeException("Exception when get resource " + url);
+    }
+
+    private List<Future<Integer>> getFutureOfFirst3Number() {
+        List<Future<Integer>> futures = List.of(Future.of(() -> 1), Future.of(() -> 2), Future.of(() -> 3));
+        return futures;
+    }
+}