Merge branch 'master' of https://github.com/eugenp/tutorials

animal-sniffer-mvn-plugin/README.md

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+## Relevant articles:

apache-cayenne/README.md

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+## Relevant articles:

asm/README.md

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+## Relevant articles:

asm/src/main/java/com/baeldung/examples/asm/instrumentation/Premain.java

@@ -1,19 +1,32 @@
 package com.baeldung.examples.asm.instrumentation;
 
 import com.baeldung.examples.asm.CustomClassWriter;
-
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.IllegalClassFormatException;
 import java.lang.instrument.Instrumentation;
+import java.security.ProtectionDomain;
 
+/**
+ *
+ * @author baeldung
+ */
 public class Premain {
 
     public static void premain(String agentArgs, Instrumentation inst) {
-        inst.addTransformer((l, name, c, d, b) -> {
+        inst.addTransformer(new ClassFileTransformer() {
 
-            if (name.equals("java/lang/Integer")) {
-                CustomClassWriter cr = new CustomClassWriter(b);
-                return cr.addField();
+            @Override
+            public byte[] transform(ClassLoader l, String name, Class c,
+                    ProtectionDomain d, byte[] b)
+                    throws IllegalClassFormatException {
+
+                if (name.equals("java/lang/Integer")) {
+                    CustomClassWriter cr = new CustomClassWriter(b);
+                    return cr.addField();
+                }
+                return b;
             }
-            return b;
         });
     }
+
 }

atomix/README.md

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+## Relevant articles:

cas-secured-app/README.md

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+## Relevant articles:

core-java/src/main/java/com/baeldung/staticdemo/Car.java

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+package com.baeldung.staticdemo;
+
+/**
+ * This class demonstrates the use of static fields and static methods
+ * the instance variables engine and displacement are distinct for 
+ * each and every object whereas static/class variable numberOfCars
+ * is unique and is shared across all objects of this class.
+ * 
+ * @author baeldung
+ *
+ */
+public class Car {
+    private String name;
+    private String engine;
+    
+    public static int numberOfCars;
+    
+    public Car(String name, String engine) {
+        this.name = name;
+        this.engine = engine;
+        numberOfCars++;
+    }
+
+    //getters and setters
+    public static int getNumberOfCars() {
+        return numberOfCars;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEngine() {
+        return engine;
+    }
+
+    public void setEngine(String engine) {
+        this.engine = engine;
+    }
+
+    public static void setNumberOfCars(int numberOfCars) {
+        Car.numberOfCars = numberOfCars;
+    }
+}

core-java/src/main/java/com/baeldung/staticdemo/Singleton.java

@@ -0,0 +1,13 @@
+package com.baeldung.staticdemo;
+
+public class Singleton  {    
+    private Singleton() {}
+    
+    private static class SingletonHolder {    
+        public static final Singleton instance = new Singleton();
+    }    
+
+    public static Singleton getInstance() {    
+        return SingletonHolder.instance;    
+    }    
+}

core-java/src/main/java/com/baeldung/staticdemo/StaticBlock.java

@@ -0,0 +1,28 @@
+package com.baeldung.staticdemo;
+
+import java.util.LinkedList;
+import java.util.List;
+
+public class StaticBlock {
+    private static List<String> ranks = new LinkedList<>();
+
+    static {
+        ranks.add("Lieutenant");
+        ranks.add("Captain");
+        ranks.add("Major");
+    }
+    
+    static {
+        ranks.add("Colonel");
+        ranks.add("General");
+    }
+
+    //getters and setters
+    public static List<String> getRanks() {
+        return ranks;
+    }
+
+    public static void setRanks(List<String> ranks) {
+        StaticBlock.ranks = ranks;
+    }
+}

core-java/src/test/java/com/baeldung/staticdemo/CarIntegrationTest.java

@@ -0,0 +1,14 @@
+package com.baeldung.staticdemo;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class CarIntegrationTest {
+    @Test
+    public void whenNumberOfCarObjectsInitialized_thenStaticCounterIncreases() {
+        new Car("Jaguar", "V8");
+        new Car("Bugatti", "W16");
+        assertEquals(2, Car.numberOfCars);
+    }
+}

core-java/src/test/java/com/baeldung/staticdemo/SingletonIntegrationTest.java

@@ -0,0 +1,15 @@
+package com.baeldung.staticdemo;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class SingletonIntegrationTest {
+
+    @Test
+    public void givenStaticInnerClass_whenMultipleTimesInstanceCalled_thenOnlyOneTimeInitialized() {
+        Singleton object1 = Singleton.getInstance();
+        Singleton object2 = Singleton.getInstance();
+        
+        Assert.assertSame(object1, object2);
+    }
+}

core-java/src/test/java/com/baeldung/staticdemo/StaticBlockIntegrationTest.java

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+package com.baeldung.staticdemo;
+
+import static org.hamcrest.collection.IsIterableContainingInOrder.contains;
+import static org.junit.Assert.assertThat;
+
+import java.util.List;
+
+import org.junit.Test;
+
+public class StaticBlockIntegrationTest {
+
+    @Test
+    public void whenAddedListElementsThroughStaticBlock_thenEnsureCorrectOrder() {
+        List<String> actualList = StaticBlock.getRanks();
+        assertThat(actualList, contains("Lieutenant", "Captain", "Major", "Colonel", "General"));
+    }
+}

deltaspike/README.md

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+## Relevant articles:

drools/backward-chaining/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/xsd/maven-4.0.0.xsd">
+
+	<modelVersion>4.0.0</modelVersion>
+
+	<artifactId>drools-backward-chaining</artifactId>
+	<version>1.0</version>
+	<name>drools-backward-chaining</name>
+
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-modules</artifactId>
+		<version>1.0.0-SNAPSHOT</version>
+	</parent>
+
+	<properties>
+		<runtime.version>6.4.0.Final</runtime.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.kie</groupId>
+			<artifactId>kie-api</artifactId>
+			<version>${runtime.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.drools</groupId>
+			<artifactId>drools-core</artifactId>
+			<version>${runtime.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.drools</groupId>
+			<artifactId>drools-decisiontables</artifactId>
+			<version>${runtime.version}</version>
+		</dependency>
+	</dependencies>
+</project>

drools/backward-chaining/src/main/java/com/baeldung/BackwardChainingBeatles.java

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+package com.baeldung;
+
+import org.kie.api.KieServices;
+import org.kie.api.runtime.KieContainer;
+import org.kie.api.runtime.KieSession;
+
+import com.baeldung.model.Beatle;
+
+public class BackwardChainingBeatles {
+    public static void main(String[] args) {
+        
+            KieServices ks = KieServices.Factory.get();
+            KieContainer kContainer = ks.getKieClasspathContainer();
+            KieSession kSession = kContainer.newKieSession("ksession-backward-chaining");
+            // drools session base on the xml configuration (<strong>kmodule.xml</strong>)
+
+            // graph population
+            kSession.insert(new Beatle("Starr", "drums"));
+            kSession.insert(new Beatle("McCartney", "bass"));
+            kSession.insert(new Beatle("Lennon", "guitar"));
+            kSession.insert(new Beatle("Harrison", "guitar"));
+
+            kSession.insert("Ringo"); // invoke the rule that calls the query implentation of backward chaining
+            kSession.fireAllRules(); // invoke all the rules
+        
+    }
+
+}

drools/backward-chaining/src/main/java/com/baeldung/model/Beatle.java

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+package com.baeldung.model;
+
+import org.kie.api.definition.type.Position;
+
+public class Beatle {
+
+    @Position(0)
+    private String lastName;
+    @Position(1)
+    private String instrument;
+
+    public Beatle(String lastName, String instrument) {
+        this.lastName = lastName;
+        this.instrument = instrument;
+    }
+
+    public String getInstrument() {
+        return instrument;
+    }
+
+    public void setInstrument(String instrument) {
+        this.instrument = instrument;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+}

drools/backward-chaining/src/main/resources/META-INF/kmodule.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
+    <kbase name="backward_chaining" packages="backward_chaining">
+        <ksession name="ksession-backward-chaining"/>
+    </kbase>
+</kmodule>

drools/backward-chaining/src/main/resources/backward_chaining/Beatles.drl

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+package com.baeldung
+
+import com.baeldung.model.Beatle;
+
+
+query whichBeatle(String lastName, String instrument) 
+  Beatle(lastName, instrument;)
+  or 
+  (Beatle(lastName, null;) 
+    and 
+   whichBeatle(null, instrument;)) //recursive call to the function that allows to search in a derivation tree structure
+end
+
+rule "Ringo"
+  when
+    String(this == "Ringo")
+    whichBeatle("Starr", "drums";)
+  then
+    System.out.println("The beatle is Ringo Starr");
+end
+
+rule "Paul"
+  when
+    String(this == "Paul")
+    whichBeatle("McCartney", "bass";)
+  then
+    System.out.println("The beatle is Paul McCartney");
+end
+
+rule "John"
+  when
+    String(this == "John")
+    whichBeatle("Lennon", "guitar";)
+  then
+    System.out.println("The beatle is John Lennon");
+end
+
+rule "George"
+  when
+    String(this == "George")
+    whichBeatle("Harrison", "guitar";)
+  then
+    System.out.println("The beatle is George Harrison");
+end

eclipse/README.md

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+## Relevant articles:

enterprise-patterns/README.md

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+## Relevant articles:

events/README.md

@@ -0,0 +1 @@
+## Relevant articles:

gradle/README.md

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+## Relevant articles:

graphql/graphql-java/README.md

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+## Relevant articles:

guest/README.md

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+## Relevant articles:

guest/spring-mvc/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/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.forketyfork.guest</groupId>
+    <artifactId>spring-mvc</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>spring-mvc</name>
+    <description>Spring MVC sample project</description>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.0.0.M5</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-thymeleaf</artifactId>
+        </dependency>
+    </dependencies>
+
+    <repositories>
+        <repository>
+            <id>spring-milestones</id>
+            <name>Spring Milestones</name>
+            <url>https://repo.spring.io/milestone</url>
+            <snapshots>
+                <enabled>false</enabled>
+            </snapshots>
+        </repository>
+    </repositories>
+    <pluginRepositories>
+        <pluginRepository>
+            <id>spring-milestones</id>
+            <name>Spring Milestones</name>
+            <url>https://repo.spring.io/milestone</url>
+            <snapshots>
+                <enabled>false</enabled>
+            </snapshots>
+        </pluginRepository>
+    </pluginRepositories>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <java.version>1.8</java.version>
+    </properties>
+
+</project>

guest/spring-mvc/src/main/java/com/forketyfork/guest/springmvc/Spring5Application.java

@@ -0,0 +1,15 @@
+package com.forketyfork.guest.springmvc;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.boot.SpringApplication;
+
+@SpringBootApplication
+@ComponentScan(basePackages = {"com.forketyfork.guest.springmvc"})
+public class Spring5Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Spring5Application.class, args);
+    }
+
+}

guest/spring-mvc/src/main/java/com/forketyfork/guest/springmvc/model/LoginData.java

@@ -0,0 +1,27 @@
+package com.forketyfork.guest.springmvc.model;
+
+public class LoginData {
+
+    private String login;
+
+    private String password;
+
+    public LoginData() {
+    }
+
+    public String getLogin() {
+        return login;
+    }
+
+    public void setLogin(String login) {
+        this.login = login;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+}

guest/spring-mvc/src/main/java/com/forketyfork/guest/springmvc/web/InternalsController.java

@@ -0,0 +1,31 @@
+package com.forketyfork.guest.springmvc.web;
+
+import com.forketyfork.guest.springmvc.model.LoginData;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.servlet.ModelAndView;
+
+import java.util.Collections;
+
+@Controller
+public class InternalsController {
+
+    private static final String LOGIN = "jack";
+    private static final String PASSWORD = "halloween";
+
+    @GetMapping("/")
+    public String hello() {
+        return "login";
+    }
+
+    @PostMapping("/login")
+    public ModelAndView login(LoginData loginData) {
+        if (LOGIN.equals(loginData.getLogin()) && PASSWORD.equals(loginData.getPassword())) {
+            return new ModelAndView("success", Collections.singletonMap("login", loginData.getLogin()));
+        } else {
+            return new ModelAndView("failure", Collections.singletonMap("login", loginData.getLogin()));
+        }
+    }
+
+}

guest/spring-mvc/src/main/resources/templates/failure.html

@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml"
+      xmlns:th="http://www.thymeleaf.org">
+<head>
+    <title>Login Failure</title>
+</head>
+<p>
+    User with login <span th:text="${login}"></span> not found, please <a href="/">try again</a>.
+</p>
+</html>

guest/spring-mvc/src/main/resources/templates/login.html

@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head><title>Login Form</title></head>
+<body>
+
+<form method="post" action="/login">
+    <input type="text" placeholder="Login" name="login"/>
+    <input type="password" placeholder="Password" name="password"/>
+    <button type="submit">Submit</button>
+</form>
+
+</body>
+</html>