Merge remote-tracking branch 'eugenp/master'

core-java/pom.xml

@@ -80,7 +80,11 @@
         </dependency>
 
         <!-- logging -->
-
+       <dependency>
+            <groupId>log4j</groupId>
+            <artifactId>log4j</artifactId>
+            <version>1.2.17</version>
+        </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>

core-java/src/main/java/com/baeldung/designpatterns/adapter/AdapterPatternDriver.java

@@ -0,0 +1,13 @@
+package com.baeldung.designpatterns.adapter;
+
+import static com.baeldung.designpatterns.util.LogerUtil.LOG;
+
+public class AdapterPatternDriver {
+    
+    public static void main(String args[]) {
+        LuxuryCarsSpeedAdapter luxuryCars = new LuxuryCarsSpeedAdapterImpl();
+        LOG.info("Bugatti Veyron Super Sport's top speed is " + luxuryCars.bugattiVeyronInKMPH() + " Kmph.");
+        LOG.info("McLaren F1 top speed is " + luxuryCars.mcLarenInKMPH() + " Kmph.");
+        LOG.info("Aston Martin One-77 top speed is " + luxuryCars.astonMartinInKMPH() + " Kmph.");
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/adapter/LuxuryCarsSpeed.java

@@ -0,0 +1,15 @@
+package com.baeldung.designpatterns.adapter;
+
+public class LuxuryCarsSpeed {
+    public double bugattiVeyronInMPH() {
+        return 268;
+    }
+    
+    public double mcLarenInMPH() {
+        return 241;
+    }
+    
+    public double astonMartinInMPH() {
+        return 220;
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/adapter/LuxuryCarsSpeedAdapter.java

@@ -0,0 +1,7 @@
+package com.baeldung.designpatterns.adapter;
+
+public interface LuxuryCarsSpeedAdapter {
+    public double bugattiVeyronInKMPH();
+    public double mcLarenInKMPH();
+    public double astonMartinInKMPH();
+}

core-java/src/main/java/com/baeldung/designpatterns/adapter/LuxuryCarsSpeedAdapterImpl.java

@@ -0,0 +1,26 @@
+package com.baeldung.designpatterns.adapter;
+
+public class LuxuryCarsSpeedAdapterImpl extends LuxuryCarsSpeed implements LuxuryCarsSpeedAdapter {
+
+    @Override
+    public double bugattiVeyronInKMPH() {
+        double mph = super.bugattiVeyronInMPH();
+        return convertMPHtoKMPH(mph);
+    }
+
+    @Override
+    public double mcLarenInKMPH() {
+        double mph = super.mcLarenInMPH();
+        return convertMPHtoKMPH(mph);
+    }
+
+    @Override
+    public double astonMartinInKMPH() {
+        double mph = super.astonMartinInMPH();
+        return convertMPHtoKMPH(mph);
+    }
+
+    private double convertMPHtoKMPH(double mph) {
+        return mph * 1.60934;
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/bridge/Blue.java

@@ -0,0 +1,12 @@
+package com.baeldung.designpatterns.bridge;
+
+import static com.baeldung.designpatterns.util.LogerUtil.LOG;
+
+public class Blue implements Color {
+
+    @Override
+    public void fillColor() { 
+        LOG.info("Color : Blue");
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/bridge/BridgePatternDriver.java

@@ -0,0 +1,14 @@
+package com.baeldung.designpatterns.bridge;
+
+public class BridgePatternDriver {
+
+    public static void main(String[] args) {
+        //a square with red color
+        Shape square = new Square(new Red());
+        square.drawShape();
+        
+        //a triangle with blue color
+        Shape triangle = new Triangle(new Blue());
+        triangle.drawShape();
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/bridge/Color.java

@@ -0,0 +1,5 @@
+package com.baeldung.designpatterns.bridge;
+
+public interface Color {
+    public void fillColor();
+}

core-java/src/main/java/com/baeldung/designpatterns/bridge/Red.java

@@ -0,0 +1,12 @@
+package com.baeldung.designpatterns.bridge;
+
+import static com.baeldung.designpatterns.util.LogerUtil.LOG;
+
+public class Red implements Color {
+
+    @Override
+    public void fillColor() {
+        LOG.info("Color : Red");
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/bridge/Shape.java

@@ -0,0 +1,11 @@
+package com.baeldung.designpatterns.bridge;
+
+public abstract class Shape {
+    protected Color color;
+    
+    public Shape(Color color) {
+        this.color = color;
+    }
+    
+    abstract public void drawShape();
+}

core-java/src/main/java/com/baeldung/designpatterns/bridge/Square.java

@@ -0,0 +1,16 @@
+package com.baeldung.designpatterns.bridge;
+
+import static com.baeldung.designpatterns.util.LogerUtil.LOG;
+
+public class Square extends Shape {
+
+    public Square(Color color) {
+        super(color);
+    }
+
+    @Override
+    public void drawShape() {
+        LOG.info("Square drawn. ");
+        color.fillColor();
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/bridge/Triangle.java

@@ -0,0 +1,16 @@
+package com.baeldung.designpatterns.bridge;
+
+import static com.baeldung.designpatterns.util.LogerUtil.LOG;
+
+public class Triangle extends Shape {
+
+    public Triangle(Color color) {
+        super(color);
+    }
+
+    @Override
+    public void drawShape() {
+        LOG.info("Triangle drawn. ");
+        color.fillColor();
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/decorator/BubbleLights.java

@@ -0,0 +1,16 @@
+package com.baeldung.designpatterns.decorator;
+
+public class BubbleLights extends TreeDecorator {
+
+    public BubbleLights(ChristmasTree tree) {
+        super(tree);
+    }
+    
+    public String decorate() {
+        return super.decorate() + decorateWithBubbleLights();
+    }
+    
+    private String decorateWithBubbleLights() {
+        return " with Bubble Lights";
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/decorator/ChristmasTree.java

@@ -0,0 +1,5 @@
+package com.baeldung.designpatterns.decorator;
+
+public interface ChristmasTree {
+    public String decorate();
+}

core-java/src/main/java/com/baeldung/designpatterns/decorator/ChristmasTreeImpl.java

@@ -0,0 +1,10 @@
+package com.baeldung.designpatterns.decorator;
+
+public class ChristmasTreeImpl implements ChristmasTree {
+
+    @Override
+    public String decorate() {
+        return "Christmas tree";
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/decorator/DecoratorPatternDriver.java

@@ -0,0 +1,20 @@
+package com.baeldung.designpatterns.decorator;
+
+import static com.baeldung.designpatterns.util.LogerUtil.LOG;
+
+public class DecoratorPatternDriver {
+
+    public static void main(String[] args) {
+        //christmas tree with just one Garland
+        ChristmasTree tree1 = new Garland(new ChristmasTreeImpl());
+        LOG.info(tree1.decorate());
+        
+        //christmas tree with two Garlands and one Bubble lights
+        ChristmasTree tree2 = new BubbleLights(new Garland(
+          new Garland(new ChristmasTreeImpl()))
+        );
+        LOG.info(tree2.decorate());
+        
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/decorator/Garland.java

@@ -0,0 +1,16 @@
+package com.baeldung.designpatterns.decorator;
+
+public class Garland extends TreeDecorator {
+
+    public Garland(ChristmasTree tree) {
+        super(tree);
+    }
+    
+    public String decorate() {
+        return super.decorate() + decorateWithGarland();
+    }
+
+    private String decorateWithGarland() {
+        return " with Garland";
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/decorator/TreeDecorator.java

@@ -0,0 +1,15 @@
+package com.baeldung.designpatterns.decorator;
+
+public abstract class TreeDecorator implements ChristmasTree {
+    private ChristmasTree tree;
+    
+    public TreeDecorator(ChristmasTree tree) {
+        this.tree = tree;
+    }
+    
+    @Override
+    public String decorate() {
+        return tree.decorate();
+    }
+
+}

core-java/src/main/java/com/baeldung/designpatterns/proxy/ExpensiveObject.java

@@ -0,0 +1,5 @@
+package com.baeldung.designpatterns.proxy;
+
+public interface ExpensiveObject {
+    public void process();
+}

core-java/src/main/java/com/baeldung/designpatterns/proxy/ExpensiveObjectImpl.java

@@ -0,0 +1,20 @@
+package com.baeldung.designpatterns.proxy;
+
+import static com.baeldung.designpatterns.util.LogerUtil.LOG;;
+
+public class ExpensiveObjectImpl implements ExpensiveObject {
+
+    public ExpensiveObjectImpl() {
+        heavyInitialConfiguration();
+    }
+    
+    @Override
+    public void process() {
+        LOG.info("processing complete.");
+    }
+    
+    private void heavyInitialConfiguration() {
+        LOG.info("Loading initial configuration...");
+    }
+    
+}

core-java/src/main/java/com/baeldung/designpatterns/proxy/ExpensiveObjectProxy.java

@@ -0,0 +1,13 @@
+package com.baeldung.designpatterns.proxy;
+
+public class ExpensiveObjectProxy implements ExpensiveObject{
+    private static ExpensiveObject object;
+
+    @Override
+    public void process() {
+        if(object == null) {
+            object = new ExpensiveObjectImpl();
+        }
+        object.process();
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/proxy/ProxyPatternDriver.java

@@ -0,0 +1,9 @@
+package com.baeldung.designpatterns.proxy;
+
+public class ProxyPatternDriver {
+    public static void main(String[] args) {
+        ExpensiveObject object = new ExpensiveObjectProxy();
+        object.process();
+        object.process();
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/singleton/ClassSingleton.java

@@ -0,0 +1,28 @@
+package com.baeldung.designpatterns.singleton;
+
+public class ClassSingleton {
+
+    private static ClassSingleton INSTANCE;
+    private String info = "Initial class info";
+    
+    private ClassSingleton(){        
+    }
+    
+    public static ClassSingleton getInstance(){
+        if(INSTANCE == null){
+            INSTANCE = new ClassSingleton();
+        }
+        
+        return INSTANCE;
+    }
+    
+    // getters and setters
+    
+    public String getInfo() {
+        return info;
+    }
+    
+    public void setInfo(String info) {
+        this.info = info;
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/singleton/EnumSingleton.java

@@ -0,0 +1,26 @@
+package com.baeldung.designpatterns.singleton;
+
+public enum EnumSingleton {
+    
+    INSTANCE("Initial enum info"); //Name of the single instance
+    
+    private String info;
+    
+    private EnumSingleton(String info) {
+        this.info = info;
+    }
+    
+    public EnumSingleton getInstance(){
+        return INSTANCE;
+    }
+    
+    //getters and setters
+
+    public String getInfo() {
+        return info;
+    }
+
+    public void setInfo(String info) {
+        this.info = info;
+    }    
+}

core-java/src/main/java/com/baeldung/designpatterns/singleton/Sandbox.java

@@ -0,0 +1,32 @@
+package com.baeldung.designpatterns.singleton;
+
+public class Sandbox {
+
+    public static void main(String[] args) {
+        
+        //Class singleton
+        
+        ClassSingleton classSingleton1 = ClassSingleton.getInstance();
+        //OurSingleton object1 = new OurSingleton(); // The constructor OurSingleton() is not visible
+        
+        System.out.println(classSingleton1.getInfo()); //Initial class info
+        
+        ClassSingleton classSingleton2 = ClassSingleton.getInstance();
+        classSingleton2.setInfo("New class info");
+        
+        System.out.println(classSingleton1.getInfo()); //New class info
+        System.out.println(classSingleton2.getInfo()); //New class info
+        
+        //Enum singleton
+        
+        EnumSingleton enumSingleton1 = EnumSingleton.INSTANCE.getInstance();
+        
+        System.out.println(enumSingleton1.getInfo()); //Initial enum info
+        
+        EnumSingleton enumSingleton2 = EnumSingleton.INSTANCE.getInstance();
+        enumSingleton2.setInfo("New enum info");
+        
+        System.out.println(enumSingleton1.getInfo()); //New enum info
+        System.out.println(enumSingleton2.getInfo()); //New enum info
+    }
+}

core-java/src/main/java/com/baeldung/designpatterns/util/LogerUtil.java

@@ -0,0 +1,35 @@
+package com.baeldung.designpatterns.util;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Properties;
+
+import org.apache.log4j.Logger;
+import org.apache.log4j.PropertyConfigurator;
+
+public class LogerUtil {
+
+    public final static Logger LOG = Logger.getLogger("GLOBAL");
+    
+    static {
+    	configuration();
+    }
+    
+    private static void configuration() {
+    	Properties props = new Properties();
+    	try {
+			props.load(
+			  new BufferedReader(
+			    new InputStreamReader(
+			      LogerUtil.class.getResourceAsStream("/log4jstructuraldp.properties")
+			    )
+			  )
+			);
+		} catch (IOException e) {
+			System.out.println("log4jstructuraldp.properties file not configured properly");
+			System.exit(0);
+		}
+    	PropertyConfigurator.configure(props);
+    }
+}

core-java/src/main/resources/log4jstructuraldp.properties

@@ -0,0 +1,9 @@
+
+# Root logger 
+log4j.rootLogger=INFO, file, stdout
+
+# Write to console
+log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+log4j.appender.stdout.Target=System.out
+log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
+log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

core-java/src/test/java/com/baeldung/designpatterns/AdapterPatternIntegrationTest.java

@@ -0,0 +1,20 @@
+package com.baeldung.designpatterns;
+
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+import com.baeldung.designpatterns.adapter.LuxuryCarsSpeedAdapter;
+import com.baeldung.designpatterns.adapter.LuxuryCarsSpeedAdapterImpl;
+
+public class AdapterPatternIntegrationTest {
+    @Test
+    public void givenLuxuryCarsAdapter_WhenConvertingMPHToKMPH_thenSuccessfullyConverted() {
+        LuxuryCarsSpeedAdapter luxuryCars = new LuxuryCarsSpeedAdapterImpl();
+        assertEquals(luxuryCars.bugattiVeyronInKMPH(), 431.30312, 0.00001);
+        assertEquals(luxuryCars.mcLarenInKMPH(), 387.85094, 0.00001);
+        assertEquals(luxuryCars.astonMartinInKMPH(), 354.0548, 0.00001);
+    }
+}
+

core-java/src/test/java/com/baeldung/designpatterns/BridgePatternIntegrationTest.java

@@ -0,0 +1,52 @@
+package com.baeldung.designpatterns;
+
+import static com.baeldung.designpatterns.util.LogerUtil.LOG;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import java.util.List;
+
+import org.apache.log4j.spi.LoggingEvent;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.baeldung.designpatterns.bridge.Blue;
+import com.baeldung.designpatterns.bridge.Red;
+import com.baeldung.designpatterns.bridge.Shape;
+import com.baeldung.designpatterns.bridge.Square;
+import com.baeldung.designpatterns.bridge.Triangle;
+
+public class BridgePatternIntegrationTest {
+    public static TestAppenderDP appender;
+    
+    @Before
+    public void setUp() {
+        appender = new TestAppenderDP();
+        LOG.addAppender(appender);
+    }
+    
+    @Test
+    public void whenBridgePatternInvoked_thenConfigSuccess() {
+        //a square with red color
+        Shape square = new Square(new Red());
+        square.drawShape();
+        
+        //a triangle with blue color
+        Shape triangle = new Triangle(new Blue());
+        triangle.drawShape();
+
+        final List<LoggingEvent> log = appender.getLog();
+        
+        assertThat((String) log.get(0).getMessage(), is("Square drawn. "));
+        assertThat((String) log.get(1).getMessage(), is("Color : Red"));
+        assertThat((String) log.get(2).getMessage(), is("Triangle drawn. "));
+        assertThat((String) log.get(3).getMessage(), is("Color : Blue"));
+    }
+    
+    @After
+    public void tearDown() {
+        LOG.removeAppender(appender);
+    }
+}
+

core-java/src/test/java/com/baeldung/designpatterns/DecoratorPatternIntegrationTest.java

@@ -0,0 +1,28 @@
+package com.baeldung.designpatterns;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import com.baeldung.designpatterns.decorator.BubbleLights;
+import com.baeldung.designpatterns.decorator.ChristmasTree;
+import com.baeldung.designpatterns.decorator.ChristmasTreeImpl;
+import com.baeldung.designpatterns.decorator.Garland;
+
+public class DecoratorPatternIntegrationTest {
+    private ChristmasTree tree;
+    
+    @Test
+    public void givenDecoratorPattern_WhenDecoratorsInjectedAtRuntime_thenConfigSuccess() {
+        //christmas tree with just one Garland
+        tree = new Garland(new ChristmasTreeImpl());
+        assertEquals(tree.decorate(), "Christmas tree with Garland");
+        
+        //christmas tree with two Garlands and one Bubble lights
+        tree = new BubbleLights(new Garland(
+          new Garland(new ChristmasTreeImpl()))
+        );
+        assertEquals(tree.decorate(), "Christmas tree with Garland with Garland with Bubble Lights");
+    }
+}
+

core-java/src/test/java/com/baeldung/designpatterns/ProxyPatternIntegrationTest.java

@@ -0,0 +1,44 @@
+package com.baeldung.designpatterns;
+
+import static com.baeldung.designpatterns.util.LogerUtil.LOG;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import java.util.List;
+
+import org.apache.log4j.spi.LoggingEvent;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.baeldung.designpatterns.proxy.ExpensiveObject;
+import com.baeldung.designpatterns.proxy.ExpensiveObjectProxy;
+
+public class ProxyPatternIntegrationTest {
+    public static TestAppenderDP appender;
+    
+    @Before
+    public void setUp() {
+        appender = new TestAppenderDP();
+        LOG.addAppender(appender);
+    }
+    
+    @Test
+    public void givenExpensiveObjectProxy_WhenObjectInitialized_thenInitializedOnlyOnce() {
+        ExpensiveObject object = new ExpensiveObjectProxy();
+        object.process();
+        object.process();
+
+        final List<LoggingEvent> log = appender.getLog();
+        
+        assertThat((String) log.get(0).getMessage(), is("Loading initial configuration..."));
+        assertThat((String) log.get(1).getMessage(), is("processing complete."));
+        assertThat((String) log.get(2).getMessage(), is("processing complete."));
+    }
+    
+    @After
+    public void tearDown() {
+        LOG.removeAppender(appender);
+    }
+}
+

core-java/src/test/java/com/baeldung/designpatterns/TestAppenderDP.java

@@ -0,0 +1,29 @@
+package com.baeldung.designpatterns;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.log4j.AppenderSkeleton;
+import org.apache.log4j.spi.LoggingEvent;
+
+public class TestAppenderDP extends AppenderSkeleton {
+    private final List<LoggingEvent> log = new ArrayList<LoggingEvent>();
+
+    @Override
+    public boolean requiresLayout() {
+        return false;
+    }
+
+    @Override
+    protected void append(final LoggingEvent loggingEvent) {
+        log.add(loggingEvent);
+    }
+
+    @Override
+    public void close() {
+    }
+
+    public List<LoggingEvent> getLog() {
+        return new ArrayList<LoggingEvent>(log);
+    }
+}

libraries/README.md

@@ -28,6 +28,7 @@
 - [Guide to the HyperLogLog Algorithm](http://www.baeldung.com/java-hyperloglog)
 - [Introduction to Neuroph](http://www.baeldung.com/intro-to-neuroph)
 - [Guide to Apache Commons CircularFifoQueue](http://www.baeldung.com/commons-circular-fifo-queue)
+- [Quick Guide to RSS with Rome](http://www.baeldung.com/rome-rss)
 
 The libraries module contains examples related to small libraries that are relatively easy to use and does not require any separate module of its own.
 

noexception/README.md

@@ -0,0 +1,2 @@
+### Relevant Articles:
+- [Introduction to NoException](http://www.baeldung.com/intrduction-to-noexception)

noexception/pom.xml

@@ -0,0 +1,23 @@
+<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>com.baeldung</groupId>
+    <artifactId>noexception</artifactId>
+    <version>1.0</version>
+    <name>noexception</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.machinezoo.noexception</groupId>
+            <artifactId>noexception</artifactId>
+            <version>1.1.0</version>
+        </dependency>
+    </dependencies>
+</project>

noexception/src/main/java/com/baeldung/noexception/CustomExceptionHandler.java

@@ -0,0 +1,24 @@
+package com.baeldung.noexception;
+
+import com.machinezoo.noexception.ExceptionHandler;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CustomExceptionHandler extends ExceptionHandler {
+
+    private Logger logger = LoggerFactory.getLogger(CustomExceptionHandler.class);
+
+    @Override
+    public boolean handle(Throwable throwable) {
+
+        if (throwable.getClass()
+            .isAssignableFrom(RuntimeException.class)
+            || throwable.getClass()
+                .isAssignableFrom(Error.class)) {
+            return false;
+        } else {
+            logger.error("Caught Exception ", throwable);
+            return true;
+        }
+    }
+}

noexception/src/test/java/com/baeldung/noexception/NoExceptionUnitTest.java

@@ -0,0 +1,63 @@
+package com.baeldung.noexception;
+
+import com.machinezoo.noexception.Exceptions;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class NoExceptionUnitTest {
+
+    private static Logger logger = LoggerFactory.getLogger(NoExceptionUnitTest.class);
+
+    @Test
+    public void whenStdExceptionHandling_thenCatchAndLog() {
+        try {
+            System.out.println("Result is " + Integer.parseInt("foobar"));
+        } catch (Throwable exception) {
+            logger.error("Caught exception:", exception);
+        }
+    }
+
+    @Test
+    public void whenDefaultNoException_thenCatchAndLog() {
+
+        Exceptions.log().run(() -> System.out.println("Result is " + Integer.parseInt("foobar")));
+    }
+
+    @Test
+    public void givenLogger_whenDefaultNoException_thenCatchAndLogWithClassName() {
+        System.out.println("Result is " + Exceptions.log(logger).get(() -> +Integer.parseInt("foobar")).orElse(-1));
+    }
+
+    @Test
+    public void givenLoggerAndMessage_whenDefaultNoException_thenCatchAndLogWithClassNameAndMessage() {
+        System.out.println("Result is " + Exceptions.log(logger, "Something went wrong:").get(() -> +Integer.parseInt("foobar")).orElse(-1));
+    }
+
+    @Test
+    public void givenDefaultValue_whenDefaultNoException_thenCatchAndLogPrintDefault() {
+        System.out.println("Result is " + Exceptions.log(logger, "Something went wrong:").get(() -> +Integer.parseInt("foobar")).orElse(-1));
+    }
+
+    @Test(expected = Error.class)
+    public void givenCustomHandler_whenError_thenRethrowError() {
+        CustomExceptionHandler customExceptionHandler = new CustomExceptionHandler();
+        customExceptionHandler.run(() -> throwError());
+    }
+
+    @Test
+    public void givenCustomHandler_whenException_thenCatchAndLog() {
+        CustomExceptionHandler customExceptionHandler = new CustomExceptionHandler();
+        customExceptionHandler.run(() -> throwException());
+    }
+
+    private static void throwError() {
+        throw new Error("This is very bad.");
+    }
+
+    private static void throwException() {
+        String testString = "foo";
+        testString.charAt(5);
+    }
+
+}

pom.xml

@@ -106,6 +106,7 @@
         <module>mockito2</module>
         <module>mocks</module>
         <module>mustache</module>
+        <module>noexception</module>
 
         <module>orika</module>
 

spring-boot-property-exp/pom.xml

@@ -24,8 +24,8 @@
     </properties>
 
     <modules>
-        <module>property-exp-default</module>
-        <module>property-exp-custom</module>
+        <module>property-exp-default-config</module>
+        <module>property-exp-custom-config</module>
     </modules>
 
 

spring-core/README.md

@@ -6,3 +6,4 @@
 - [Constructor Injection in Spring with Lombok](http://www.baeldung.com/spring-injection-lombok)
 - [A Quick Guide to Spring @Value](http://www.baeldung.com/spring-value-annotation)
 - [Spring YAML Configuration](http://www.baeldung.com/spring-yaml)
+- [Using Spring @Value with Defaults](http://www.baeldung.com/spring-value-defaults)