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

Conflicts: pdf/src/main/java/com/baeldung/pdf/PDF2HTMLExample.java pdf/src/main/java/com/baeldung/pdf/PDF2ImageExample.java pdf/src/main/java/com/baeldung/pdf/PDF2TextExample.java pdf/src/main/java/com/baeldung/pdf/PDF2WordExample.java
2016-11-03 12:01:28 +01:00 · 2016-11-03 12:01:28 +01:00 · 3eb57fa478
parent c4f9a6e120 8628a63d95
commit 3eb57fa478
46 changed files with 1074 additions and 43 deletions
--- a/core-java/src/main/java/com/baeldung/hexToAscii/HexToAscii.java
+++ b/core-java/src/main/java/com/baeldung/hexToAscii/HexToAscii.java
@ -0,0 +1,46 @@
+package com.baeldung.hexToAscii;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class HexToAscii {
+
+    @Test
+    public static void whenHexToAscii() {
+        String asciiString = "http://www.baeldung.com/jackson-serialize-dates";
+        String hexEquivalent = "687474703a2f2f7777772e6261656c64756e672e636f6d2f6a61636b736f6e2d73657269616c697a652d6461746573";
+
+        assertEquals(asciiString, hexToAscii(hexEquivalent));
+    }
+
+    @Test
+    public static void whenAsciiToHex() {
+        String asciiString = "http://www.baeldung.com/jackson-serialize-dates";
+        String hexEquivalent = "687474703a2f2f7777772e6261656c64756e672e636f6d2f6a61636b736f6e2d73657269616c697a652d6461746573";
+
+        assertEquals(hexEquivalent, asciiToHex(asciiString));
+    }
+
+    //
+
+    private static String asciiToHex(String asciiStr) {
+        char[] chars = asciiStr.toCharArray();
+        StringBuilder hex = new StringBuilder();
+        for (char ch : chars) {
+            hex.append(Integer.toHexString((int) ch));
+        }
+
+        return hex.toString();
+    }
+
+    private static String hexToAscii(String hexStr) {
+        StringBuilder output = new StringBuilder("");
+        for (int i = 0; i < hexStr.length(); i += 2) {
+            String str = hexStr.substring(i, i + 2);
+            output.append((char) Integer.parseInt(str, 16));
+        }
+        return output.toString();
+    }
+
+}
--- a/core-java/src/main/java/com/baeldung/java/nio/selector/EchoClient.java
+++ b/core-java/src/main/java/com/baeldung/java/nio/selector/EchoClient.java
@ -17,6 +17,11 @@ public class EchoClient {
        return instance;
    }

+    public static void stop() throws IOException {
+        client.close();
+        buffer = null;
+    }
+
    private EchoClient() {
        try {
            client = SocketChannel.open(new InetSocketAddress("localhost", 5454));
@ -42,5 +47,4 @@ public class EchoClient {
        return response;

    }
-
 }
--- a/core-java/src/main/java/com/baeldung/java/nio/selector/EchoServer.java
+++ b/core-java/src/main/java/com/baeldung/java/nio/selector/EchoServer.java
@ -1,21 +1,19 @@
 package com.baeldung.java.nio.selector;

+import java.io.File;
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.nio.ByteBuffer;
+import java.nio.channels.SelectionKey;
+import java.nio.channels.Selector;
 import java.nio.channels.ServerSocketChannel;
 import java.nio.channels.SocketChannel;
-import java.nio.channels.Selector;
-import java.nio.channels.SelectionKey;
-import java.nio.ByteBuffer;
-import java.io.IOException;
-import java.util.Set;
 import java.util.Iterator;
-import java.net.InetSocketAddress;
-import java.io.File;
+import java.util.Set;

 public class EchoServer {

-    public static void main(String[] args)
-
-            throws IOException {
+    public static void main(String[] args) throws IOException {
        Selector selector = Selector.open();
        ServerSocketChannel serverSocket = ServerSocketChannel.open();
        serverSocket.bind(new InetSocketAddress("localhost", 5454));
@ -49,7 +47,6 @@ public class EchoServer {
        }
    }

-
    public static Process start() throws IOException, InterruptedException {
        String javaHome = System.getProperty("java.home");
        String javaBin = javaHome + File.separator + "bin" + File.separator + "java";
--- a/core-java/src/test/java/com/baeldung/java/nio/selector/NioEchoIntegrationTest.java
+++ b/core-java/src/test/java/com/baeldung/java/nio/selector/NioEchoIntegrationTest.java
@ -4,19 +4,32 @@ import static org.junit.Assert.assertEquals;

 import java.io.IOException;

+import org.junit.After;
+import org.junit.Before;
 import org.junit.Test;

 public class NioEchoIntegrationTest {

+    Process server;
+    EchoClient client;
+
+    @Before
+    public void setup() throws IOException, InterruptedException {
+        server = EchoServer.start();
+        client = EchoClient.start();
+    }
+
    @Test
-    public void givenClient_whenServerEchosMessage_thenCorrect() throws IOException, InterruptedException {
-        Process process = EchoServer.start();
-        EchoClient client = EchoClient.start();
+    public void givenServerClient_whenServerEchosMessage_thenCorrect() {
        String resp1 = client.sendMessage("hello");
        String resp2 = client.sendMessage("world");
        assertEquals("hello", resp1);
        assertEquals("world", resp2);
+    }

-        process.destroy();
+    @After
+    public void teardown() throws IOException {
+        server.destroy();
+        EchoClient.stop();
    }
 }
--- a/enterprise-patterns/pom.xml
+++ b/enterprise-patterns/pom.xml
@ -0,0 +1,35 @@
+<?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.enterprise.patterns</groupId>
+    <artifactId>enterprise-patterns-parent</artifactId>
+    <packaging>pom</packaging>
+    <modules>
+        <module>spring-dispatcher-servlet</module>
+    </modules>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <version>3.5.1</version>
+                    <configuration>
+                        <source>1.8</source>
+                        <target>1.8</target>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
+</project>
--- a/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/commands/LoginCommand.java
+++ b/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/commands/LoginCommand.java
@ -3,6 +3,7 @@ package com.baeldung.patterns.intercepting.filter.commands;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpSession;
 import java.io.IOException;
+import java.util.Optional;

 public class LoginCommand extends FrontCommand {
    @Override
@ -12,10 +13,8 @@ public class LoginCommand extends FrontCommand {
            session.setAttribute("username", request.getParameter("username"));
            response.sendRedirect(request.getParameter("redirect"));
        } else {
-            String queryString = request.getQueryString();
-            if (queryString == null) {
-                queryString = "command=Home";
-            }
+            String queryString = Optional.ofNullable(request.getQueryString())
+              .orElse("command=Home");
            request.setAttribute("redirect", request.getRequestURL()
              .append("?").append(queryString).toString());
            forward("login");
--- a/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/commands/LogoutCommand.java
+++ b/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/commands/LogoutCommand.java
@ -3,14 +3,17 @@ package com.baeldung.patterns.intercepting.filter.commands;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpSession;
 import java.io.IOException;
+import java.util.Optional;

 public class LogoutCommand extends FrontCommand {
    @Override
    public void process() throws ServletException, IOException {
        super.process();
-        HttpSession session = request.getSession(false);
-        session.removeAttribute("username");
-        session.removeAttribute("order");
+        Optional.ofNullable(request.getSession(false))
+          .ifPresent(session -> {
+              session.removeAttribute("username");
+              session.removeAttribute("order");
+          });
        response.sendRedirect("/?command=Home");
    }
 }
--- a/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/commands/OrderCommand.java
+++ b/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/commands/OrderCommand.java
@ -8,6 +8,7 @@ import com.baeldung.patterns.intercepting.filter.data.OrderImpl;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpSession;
 import java.io.IOException;
+import java.util.Optional;

 public class OrderCommand extends FrontCommand {
    @Override
@ -15,11 +16,10 @@ public class OrderCommand extends FrontCommand {
        super.process();
        if (request.getMethod().equals("POST")) {
            HttpSession session = request.getSession(false);
-            Order order = (Order) session.getAttribute("order");
-            if (order == null) {
-                String username = (String) session.getAttribute("username");
-                order = new OrderImpl(username);
-            }
+            Order order = Optional
+              .ofNullable(session.getAttribute("order"))
+              .map(Order.class::cast)
+              .orElseGet(() -> new OrderImpl((String) session.getAttribute("username")));
            Bookshelf bookshelf = (Bookshelf) request.getServletContext()
              .getAttribute("bookshelf");
            String isbn = request.getParameter("isbn");
--- a/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/filters/EncodingFilter.java
+++ b/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/filters/EncodingFilter.java
@ -4,6 +4,7 @@ import javax.servlet.*;
 import javax.servlet.annotation.WebFilter;
 import javax.servlet.annotation.WebInitParam;
 import java.io.IOException;
+import java.util.Optional;

@WebFilter(
  servletNames = {"intercepting-filter"},
@ -24,10 +25,9 @@ public class EncodingFilter extends BaseFilter {
      ServletResponse response,
      FilterChain chain
    ) throws IOException, ServletException {
-        String encoding = request.getParameter("encoding");
-        if (encoding == null) {
-            encoding = this.encoding;
-        }
+        String encoding = Optional
+          .ofNullable(request.getParameter("encoding"))
+          .orElse(this.encoding);
        response.setCharacterEncoding(encoding);
        chain.doFilter(request, response);
    }
--- a/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/filters/LoggingFilter.java
+++ b/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/filters/LoggingFilter.java
@ -10,6 +10,7 @@ import javax.servlet.ServletResponse;
 import javax.servlet.annotation.WebFilter;
 import javax.servlet.http.HttpServletRequest;
 import java.io.IOException;
+import java.util.Optional;

@WebFilter(servletNames = "intercepting-filter")
 public class LoggingFilter extends BaseFilter {
@ -23,10 +24,10 @@ public class LoggingFilter extends BaseFilter {
    ) throws IOException, ServletException {
        chain.doFilter(request, response);
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
-        String username = (String) httpServletRequest.getAttribute("username");
-        if (username == null) {
-            username = "guest";
-        }
+        String username = Optional
+          .ofNullable(httpServletRequest.getAttribute("username"))
+          .map(Object::toString)
+          .orElse("guest");
        log.info("Request from '{}@{}': {}?{}", username, request.getRemoteAddr(),
          httpServletRequest.getRequestURI(), request.getParameterMap());
    }
--- a/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/filters/VisitorCounterFilter.java
+++ b/patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/filters/VisitorCounterFilter.java
@ -5,6 +5,7 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpSession;
 import java.io.IOException;
 import java.util.HashSet;
+import java.util.Optional;
 import java.util.Set;

 public class VisitorCounterFilter implements Filter {
@ -21,8 +22,9 @@ public class VisitorCounterFilter implements Filter {
      FilterChain chain
    ) throws IOException, ServletException {
        HttpSession session = ((HttpServletRequest) request).getSession(false);
-        String username = (String) session.getAttribute("username");
-        users.add(username);
+        Optional.ofNullable(session.getAttribute("username"))
+          .map(Object::toString)
+          .ifPresent(users::add);
        request.setAttribute("counter", users.size());
        chain.doFilter(request, response);
    }
--- a/pom.xml
+++ b/pom.xml
@ -95,6 +95,7 @@
        <module>spring-data-neo4j</module>
        <module>spring-data-redis</module>
        <module>spring-data-rest</module>
+        <module>spring-dispatcher-servlet</module>
        <module>spring-exceptions</module>
        <module>spring-freemarker</module>
        <module>spring-hibernate3</module>
--- a/spring-dispatcher-servlet/pom.xml
+++ b/spring-dispatcher-servlet/pom.xml
@ -0,0 +1,82 @@
+<?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>spring-dispatcher-servlet</artifactId>
+    <packaging>war</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>..</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>javax.servlet</groupId>
+            <artifactId>javax.servlet-api</artifactId>
+            <version>3.1.0</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-webmvc</artifactId>
+            <version>4.3.3.RELEASE</version>
+        </dependency>
+        <dependency>
+            <groupId>org.thymeleaf</groupId>
+            <artifactId>thymeleaf-spring4</artifactId>
+            <version>3.0.2.RELEASE</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>1.7.21</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>2.7</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-slf4j-impl</artifactId>
+            <version>2.7</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.5.1</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-war-plugin</artifactId>
+                <version>3.0.0</version>
+                <configuration>
+                    <failOnMissingWebXml>false</failOnMissingWebXml>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.eclipse.jetty</groupId>
+                <artifactId>jetty-maven-plugin</artifactId>
+                <version>9.3.12.v20160915</version>
+                <configuration>
+                    <webApp>
+                        <contextPath>/</contextPath>
+                    </webApp>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/RootConfiguration.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/RootConfiguration.java
@ -0,0 +1,19 @@
+package com.baeldung.spring.dispatcher.servlet;
+
+import com.baeldung.spring.dispatcher.servlet.models.Task;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.util.*;
+
+@Configuration
+public class RootConfiguration {
+    @Bean
+    public Map<String, List<Task>> taskList() {
+        Map<String, List<Task>> taskMap = new HashMap<>();
+        List<Task> taskList = new ArrayList<>();
+        taskList.add(new Task("Clean the dishes!", new Date()));
+        taskMap.put("Cid", taskList);
+        return taskMap;
+    }
+}
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/WebApplicationInitializer.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/WebApplicationInitializer.java
@ -0,0 +1,30 @@
+package com.baeldung.spring.dispatcher.servlet;
+
+import org.springframework.web.context.ContextLoaderListener;
+import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
+import org.springframework.web.servlet.DispatcherServlet;
+
+import javax.servlet.MultipartConfigElement;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRegistration;
+
+public class WebApplicationInitializer implements org.springframework.web.WebApplicationInitializer {
+    @Override
+    public void onStartup(ServletContext servletContext) throws ServletException {
+        AnnotationConfigWebApplicationContext rootContext =
+          new AnnotationConfigWebApplicationContext();
+        rootContext.register(RootConfiguration.class);
+        servletContext.addListener(new ContextLoaderListener(rootContext));
+        AnnotationConfigWebApplicationContext webContext =
+          new AnnotationConfigWebApplicationContext();
+        webContext.register(WebConfiguration.class);
+        DispatcherServlet dispatcherServlet = new DispatcherServlet(webContext);
+        ServletRegistration.Dynamic servlet = servletContext.addServlet("dispatcher",
+          dispatcherServlet);
+        servlet.addMapping("/*");
+        MultipartConfigElement multipartConfigElement =
+          new MultipartConfigElement("/tmp");
+        servlet.setMultipartConfig(multipartConfigElement);
+    }
+}
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/WebConfiguration.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/WebConfiguration.java
@ -0,0 +1,129 @@
+package com.baeldung.spring.dispatcher.servlet;
+
+import org.springframework.context.MessageSource;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.support.ResourceBundleMessageSource;
+import org.springframework.ui.context.support.ResourceBundleThemeSource;
+import org.springframework.web.multipart.MultipartResolver;
+import org.springframework.web.multipart.support.StandardServletMultipartResolver;
+import org.springframework.web.servlet.HandlerExceptionResolver;
+import org.springframework.web.servlet.LocaleResolver;
+import org.springframework.web.servlet.ThemeResolver;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
+import org.springframework.web.servlet.i18n.CookieLocaleResolver;
+import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
+import org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver;
+import org.springframework.web.servlet.theme.CookieThemeResolver;
+import org.springframework.web.servlet.theme.ThemeChangeInterceptor;
+import org.thymeleaf.spring4.SpringTemplateEngine;
+import org.thymeleaf.spring4.view.ThymeleafViewResolver;
+import org.thymeleaf.templatemode.TemplateMode;
+import org.thymeleaf.templateresolver.ServletContextTemplateResolver;
+
+import javax.servlet.ServletContext;
+import java.util.Locale;
+
+@Configuration
+@ComponentScan("com.baeldung.spring.dispatcher.servlet.web")
+@EnableWebMvc
+public class WebConfiguration extends WebMvcConfigurerAdapter {
+    @Override
+    public void addResourceHandlers(ResourceHandlerRegistry registry) {
+        registry
+          .addResourceHandler("/public/**")
+          .addResourceLocations("/public/");
+    }
+
+    @Override
+    public void addInterceptors(InterceptorRegistry registry) {
+        registry.addInterceptor(localeChangeInterceptor());
+        registry.addInterceptor(themeChangeInterceptor());
+    }
+
+    @Bean
+    public ServletContextTemplateResolver templateResolver(ServletContext servletContext) {
+        ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver(servletContext);
+        templateResolver.setPrefix("/WEB-INF/views/");
+        templateResolver.setSuffix(".html");
+        templateResolver.setTemplateMode(TemplateMode.HTML);
+        return templateResolver;
+    }
+
+    @Bean
+    public SpringTemplateEngine templateEngine(ServletContextTemplateResolver templateResolver) {
+        SpringTemplateEngine templateEngine = new SpringTemplateEngine();
+        templateEngine.setTemplateResolver(templateResolver);
+        return templateEngine;
+    }
+
+    @Bean
+    public ThymeleafViewResolver viewResolver(SpringTemplateEngine templateEngine) {
+        ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
+        viewResolver.setTemplateEngine(templateEngine);
+        return viewResolver;
+    }
+
+    @Bean
+    public MessageSource messageSource() {
+        ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
+        messageSource.setBasename("messages");
+        messageSource.setFallbackToSystemLocale(false);
+        return messageSource;
+    }
+
+    @Bean
+    public LocaleResolver localeResolver() {
+        CookieLocaleResolver localeResolver = new CookieLocaleResolver();
+        localeResolver.setDefaultLocale(Locale.ENGLISH);
+        localeResolver.setCookieName("locale");
+        localeResolver.setCookieMaxAge(-1);
+        return localeResolver;
+    }
+
+    @Bean
+    public LocaleChangeInterceptor localeChangeInterceptor() {
+        LocaleChangeInterceptor localeChangeInterceptor = new LocaleChangeInterceptor();
+        localeChangeInterceptor.setParamName("lang");
+        localeChangeInterceptor.setIgnoreInvalidLocale(true);
+        return localeChangeInterceptor;
+    }
+
+    @Bean
+    public ResourceBundleThemeSource themeSource() {
+        ResourceBundleThemeSource themeSource = new ResourceBundleThemeSource();
+        themeSource.setBasenamePrefix("theme-");
+        themeSource.setFallbackToSystemLocale(false);
+        return themeSource;
+    }
+
+    @Bean
+    public ThemeResolver themeResolver() {
+        CookieThemeResolver themeResolver = new CookieThemeResolver();
+        themeResolver.setDefaultThemeName("robotask");
+        themeResolver.setCookieName("theme");
+        themeResolver.setCookieMaxAge(-1);
+        return themeResolver;
+    }
+
+    @Bean
+    public ThemeChangeInterceptor themeChangeInterceptor() {
+        ThemeChangeInterceptor themeChangeInterceptor = new ThemeChangeInterceptor();
+        themeChangeInterceptor.setParamName("theme");
+        return themeChangeInterceptor;
+    }
+
+    @Bean
+    public MultipartResolver multipartResolver() {
+        return new StandardServletMultipartResolver();
+    }
+
+    @Bean
+    public HandlerExceptionResolver handlerExceptionResolver() {
+        return new ExceptionHandlerExceptionResolver();
+    }
+}
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/models/Attachment.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/models/Attachment.java
@ -0,0 +1,58 @@
+package com.baeldung.spring.dispatcher.servlet.models;
+
+import java.util.UUID;
+
+public class Attachment {
+    private String id;
+
+    private String name;
+
+    private String description;
+
+    public Attachment() {
+        this.id = UUID.randomUUID().toString();
+    }
+
+    public Attachment(String name, String description) {
+        this();
+        this.name = name;
+        this.description = description;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Attachment that = (Attachment) o;
+        return id.equals(that.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return id.hashCode();
+    }
+}
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/models/Task.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/models/Task.java
@ -0,0 +1,52 @@
+package com.baeldung.spring.dispatcher.servlet.models;
+
+import org.springframework.format.annotation.DateTimeFormat;
+
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Set;
+
+public class Task {
+    private String description;
+
+    @DateTimeFormat(pattern = "yyyy-MM-dd'T'hh:mm")
+    private Date due;
+
+    private Set<Attachment> attachments = new HashSet<>();
+
+    public Task() {
+    }
+
+    public Task(Date due) {
+        this.due = due;
+    }
+
+    public Task(String description, Date due) {
+        this.description = description;
+        this.due = due;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public Date getDue() {
+        return due;
+    }
+
+    public void setDue(Date due) {
+        this.due = due;
+    }
+
+    public Set<Attachment> getAttachments() {
+        return attachments;
+    }
+
+    public void setAttachments(Set<Attachment> attachments) {
+        this.attachments = attachments;
+    }
+}
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/AttachmentController.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/AttachmentController.java
@ -0,0 +1,17 @@
+package com.baeldung.spring.dispatcher.servlet.web;
+
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+@RequestMapping("/attachments")
+public interface AttachmentController {
+    @GetMapping("/{attachmentId}")
+    ResponseEntity<FileSystemResource> getAttachment(
+      @PathVariable("attachmentId") String attachmentId,
+      @RequestParam(name = "download", required = false, defaultValue = "false") boolean forcedDownload
+    );
+}
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/AttachmentControllerImpl.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/AttachmentControllerImpl.java
@ -0,0 +1,45 @@
+package com.baeldung.spring.dispatcher.servlet.web;
+
+import com.baeldung.spring.dispatcher.servlet.models.Task;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestParam;
+
+import java.net.URLConnection;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+@Controller
+public class AttachmentControllerImpl implements AttachmentController {
+    @Autowired
+    private Map<String, List<Task>> taskMap;
+
+    @Override
+    public ResponseEntity<FileSystemResource> getAttachment(
+      @PathVariable("attachmentId") String attachmentId,
+      @RequestParam(name = "download", required = false, defaultValue = "false") boolean forcedDownload
+    ) {
+        FileSystemResource resource = new FileSystemResource("/tmp/" + attachmentId);
+        HttpHeaders headers = new HttpHeaders();
+        taskMap.values().stream()
+          .flatMap(Collection::stream)
+          .flatMap(t -> t.getAttachments().stream())
+          .filter(a -> a.getId().equals(attachmentId))
+          .findFirst()
+          .ifPresent(a -> {
+              headers.add("Content-Disposition",
+                "attachment; filename=" + a.getName());
+              headers.add("Content-Type", forcedDownload ?
+                MediaType.APPLICATION_OCTET_STREAM_VALUE :
+                URLConnection.guessContentTypeFromName(a.getName()));
+          });
+        return new ResponseEntity<>(resource, headers, HttpStatus.OK);
+    }
+}
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/GlobalDefaultExceptionHandler.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/GlobalDefaultExceptionHandler.java
@ -0,0 +1,19 @@
+package com.baeldung.spring.dispatcher.servlet.web;
+
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+
+@ControllerAdvice
+public class GlobalDefaultExceptionHandler {
+    @ExceptionHandler(Exception.class)
+    public ModelAndView defaultErrorHandler(HttpServletRequest request, Exception e) throws Exception {
+        ModelAndView modelAndView = new ModelAndView();
+        modelAndView.addObject("exception", e);
+        modelAndView.addObject("url", request.getRequestURL());
+        modelAndView.setViewName("error");
+        return modelAndView;
+    }
+}
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/HomeController.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/HomeController.java
@ -0,0 +1,13 @@
+package com.baeldung.spring.dispatcher.servlet.web;
+
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@RequestMapping("/")
+public interface HomeController {
+    @GetMapping("/*")
+    String home(
+      Model model
+    );
+}
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/HomeControllerImpl.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/HomeControllerImpl.java
@ -0,0 +1,25 @@
+package com.baeldung.spring.dispatcher.servlet.web;
+
+import com.baeldung.spring.dispatcher.servlet.models.Task;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+@Controller
+public class HomeControllerImpl implements HomeController {
+    @Autowired
+    private Map<String, List<Task>> taskMap;
+
+    @Override
+    public String home(Model model) {
+        List<String> users = taskMap.keySet().stream()
+          .sorted()
+          .collect(Collectors.toList());
+        model.addAttribute("users", users);
+        return "home";
+    }
+}
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/TaskController.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/TaskController.java
@ -0,0 +1,49 @@
+package com.baeldung.spring.dispatcher.servlet.web;
+
+import com.baeldung.spring.dispatcher.servlet.models.Task;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+
+@RequestMapping("/tasks")
+public interface TaskController {
+    @GetMapping("/{username}/list")
+    String listTasks(
+      @PathVariable("username") String username,
+      Model model
+    );
+
+    @GetMapping("/{username}/add")
+    String addTask(
+      @PathVariable("username") String username,
+      Model model
+    );
+
+    @PostMapping("/{username}/add")
+    String addTask(
+      @PathVariable("username") String username,
+      @ModelAttribute Task task
+    );
+
+    @GetMapping("/{username}/get/{id}")
+    String getTask(
+      @PathVariable("username") String username,
+      @PathVariable("id") int id,
+      Model model
+    );
+
+    @GetMapping("/{username}/get/{id}/attach")
+    String attachToTask(
+      @PathVariable("username") String username,
+      @PathVariable("id") int id,
+      Model model
+    );
+
+    @PostMapping("/{username}/get/{id}/attach")
+    String attachToTask(
+      @PathVariable("username") String username,
+      @PathVariable("id") int id,
+      @RequestParam("attachment") MultipartFile attachment,
+      @RequestParam("description") String description
+    );
+}
--- a/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/TaskControllerImpl.java
+++ b/spring-dispatcher-servlet/src/main/java/com/baeldung/spring/dispatcher/servlet/web/TaskControllerImpl.java
@ -0,0 +1,111 @@
+package com.baeldung.spring.dispatcher.servlet.web;
+
+import com.baeldung.spring.dispatcher.servlet.models.Attachment;
+import com.baeldung.spring.dispatcher.servlet.models.Task;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.*;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.*;
+import java.util.stream.Collectors;
+
+@Controller
+public class TaskControllerImpl implements TaskController {
+    @Autowired
+    private Map<String, List<Task>> taskMap;
+
+    @Override
+    public String listTasks(
+      @PathVariable("username") String username,
+      Model model
+    ) {
+        List<Task> tasks = taskMap.get(username).stream()
+          .sorted(Comparator.comparing(Task::getDue))
+          .collect(Collectors.toList());
+        model.addAttribute("username", username);
+        model.addAttribute("tasks", tasks);
+        return "task-list";
+    }
+
+    @Override
+    public String addTask(
+      @PathVariable("username") String username,
+      Model model
+    ) {
+        model.addAttribute("username", username);
+        model.addAttribute("task", new Task(new Date()));
+        return "task-add";
+    }
+
+    @Override
+    public String addTask(
+      @PathVariable("username") String username,
+      @ModelAttribute Task task
+    ) {
+        List<Task> taskList = taskMap.get(username);
+        if (taskList == null) {
+            taskList = new ArrayList<>();
+        }
+        taskList.add(task);
+        taskMap.put(username, taskList);
+        return "redirect:list";
+    }
+
+    @Override
+    public String getTask(
+      @PathVariable("username") String username,
+      @PathVariable("id") int id,
+      Model model
+    ) {
+        Task task = taskMap.get(username).get(id);
+        model.addAttribute("username", username);
+        model.addAttribute("id", id);
+        model.addAttribute("task", task);
+        return "task-get";
+    }
+
+    @Override
+    public String attachToTask(
+      @PathVariable("username") String username,
+      @PathVariable("id") int id,
+      Model model
+    ) {
+        model.addAttribute("username", username);
+        model.addAttribute("id", id);
+        return "task-attach";
+    }
+
+    @Override
+    public String attachToTask(
+      @PathVariable("username") String username,
+      @PathVariable("id") int id,
+      @RequestParam("attachment") MultipartFile multipartFile,
+      @RequestParam("description") String description
+    ) {
+        Task task = taskMap.get(username).get(id);
+        Attachment attachment = new Attachment(multipartFile.getOriginalFilename(),
+          description);
+        task.getAttachments().add(attachment);
+        try (InputStream inputStream =
+               new BufferedInputStream(multipartFile.getInputStream());
+             OutputStream outputStream =
+               new BufferedOutputStream(Files.newOutputStream(
+                 Paths.get("/tmp", attachment.getId())))) {
+            byte[] buf = new byte[1024 * 16];
+            int len;
+            while ((len = inputStream.read(buf)) != -1) {
+                outputStream.write(buf, 0, len);
+            }
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to upload file!", e);
+        }
+        return "redirect:./";
+    }
+}
--- a/spring-dispatcher-servlet/src/main/resources/log4j2.xml
+++ b/spring-dispatcher-servlet/src/main/resources/log4j2.xml
@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="WARN">
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT">
+            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36}:%n[+] %msg%n"/>
+        </Console>
+    </Appenders>
+
+    <Loggers>
+        <Root level="info">
+            <AppenderRef ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>
--- a/spring-dispatcher-servlet/src/main/resources/messages.properties
+++ b/spring-dispatcher-servlet/src/main/resources/messages.properties
@ -0,0 +1,22 @@
+home.title=Welcome to TaskTools!
+task.add.description=description
+task.add.due=due
+task.add.header=Adding a task to {0}''s list:
+task.add.submit=Submit
+task.add.title={0}: task add
+task.attach.attachment=attached file
+task.attach.description=description
+task.attach.header=task #{0}: attach file
+task.attach.submit=Submit
+task.attach.title=#{0}: Attach file
+task.get.attach=Attach file
+task.get.attachments=attachments:
+task.get.download=Download
+task.get.header=task #{0}:
+task.get.list=Back
+task.get.title={0}: task details
+task.list.add-new=Add new
+task.list.details=Details
+task.list.header={0}''s tasks:
+task.list.home=Home
+task.list.title={0}: task list
--- a/spring-dispatcher-servlet/src/main/resources/messages_de.properties
+++ b/spring-dispatcher-servlet/src/main/resources/messages_de.properties
@ -0,0 +1,22 @@
+home.title=Willkommen bei TaskTools!
+task.add.description=Beschreibung
+task.add.due=f\u00e4llig
+task.add.header=F\u00fcge eine Aufgabe zu {0}''s Liste hinzu:
+task.add.submit=Senden
+task.add.title={0}: Task hinzuf\u00fcgen
+task.attach.attachment=Angeh\u00e4ngte Datei
+task.attach.description=Beschreibung
+task.attach.header=Task #{0}: Datei anh\u00e4ngen
+task.attach.submit=Senden
+task.attach.title=#{0}: Datei anh\u00e4ngen
+task.get.attach=Datei anh\u00e4ngen
+task.get.attachments=Anh\u00e4nge:
+task.get.download=Download
+task.get.header=Task #{0}:
+task.get.list=Zur\u00fcck
+task.get.title={0}: Task Details
+task.list.add-new=Neuer Task
+task.list.details=Details
+task.list.header={0}''s Tasks:
+task.list.home=Startseite
+task.list.title={0}: Task Liste
--- a/spring-dispatcher-servlet/src/main/resources/theme-post_it.properties
+++ b/spring-dispatcher-servlet/src/main/resources/theme-post_it.properties
@ -0,0 +1 @@
+stylesheet=/public/css/themes/post_it.css
--- a/spring-dispatcher-servlet/src/main/resources/theme-robotask.properties
+++ b/spring-dispatcher-servlet/src/main/resources/theme-robotask.properties
@ -0,0 +1 @@
+stylesheet=/public/css/themes/robotask.css
--- a/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/error.html
+++ b/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/error.html
@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+    <head>
+        <title>Error</title>
+        <link rel="stylesheet" type="text/css" href="/public/css/base.css">
+        <link rel="stylesheet" type="text/css" th:href="${#themes.code('stylesheet')}">
+    </head>
+    <body>
+        <h2>Error:</h2>
+        <p th:text="|URL: ${url}|"></p>
+        <p th:text="${exception}"></p>
+    </body>
+</html>
--- a/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/home.html
+++ b/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/home.html
@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+    <head>
+        <title th:text="#{home.title}"></title>
+        <link rel="stylesheet" type="text/css" href="/public/css/base.css">
+        <link rel="stylesheet" type="text/css" th:href="${#themes.code('stylesheet')}">
+    </head>
+    <body>
+        <h2>TaskTools</h2>
+        <ul>
+            <li th:each="username : ${users}">
+                <a th:href="@{/tasks/{username}/list(username=${username})}" th:text="${username}"></a>
+            </li>
+        </ul>
+    </body>
+</html>
--- a/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/task-add.html
+++ b/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/task-add.html
@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+    <head>
+        <title th:text="#{task.add.title(${username})}"></title>
+        <link rel="stylesheet" type="text/css" href="/public/css/base.css">
+        <link rel="stylesheet" type="text/css" th:href="${#themes.code('stylesheet')}">
+    </head>
+    <body>
+        <h2 th:text="#{task.add.header(${username})}"></h2>
+        <form method="post" action="#" th:action="@{/tasks/{username}/add(username=${username})}" th:object="${task}">
+            <input type="text" th:field="*{description}" th:placeholder="#{task.add.description}"/>
+            <input type="datetime-local" th:field="*{due}" th:placeholder="#{task.add.due}"/>
+            <input type="submit" th:value="#{task.add.submit}"/>
+        </form>
+    </body>
+</html>
--- a/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/task-attach.html
+++ b/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/task-attach.html
@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+    <head>
+        <title th:text="#{task.attach.title(${id})}"></title>
+        <link rel="stylesheet" type="text/css" href="/public/css/base.css">
+        <link rel="stylesheet" type="text/css" th:href="${#themes.code('stylesheet')}">
+    </head>
+    <body>
+        <h2 th:text="#{task.attach.header(${id})}"></h2>
+        <form method="post" action="#" enctype="multipart/form-data"
+              th:action="@{/tasks/{username}/get/{id}/attach(username=${username},id=${id})}">
+            <input type="file" name="attachment" th:placeholder="#{task.attach.attachment}"/>
+            <input type="text" name="description" th:placeholder="#{task.attach.description}"/>
+            <input type="submit" th:value="#{task.attach.submit}"/>
+        </form>
+    </body>
+</html>
--- a/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/task-get.html
+++ b/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/task-get.html
@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+    <head>
+        <title th:text="#{task.get.title(${task.description})}"></title>
+        <link rel="stylesheet" type="text/css" href="/public/css/base.css">
+        <link rel="stylesheet" type="text/css" th:href="${#themes.code('stylesheet')}">
+    </head>
+    <body>
+        <h2 th:text="#{task.get.header(${id})}"></h2>
+        <p th:text="${task.due}"></p>
+        <p th:text="${task.description}"></p>
+        <hr/>
+        <p th:text="#{task.get.attachments}"></p>
+        <dl th:each="attachment : ${task.attachments}">
+            <dt><img src="#" th:src="@{/attachments/{id}(id=${attachment.id})}"></dt>
+            <dt>
+                <span th:text="${attachment.name}"></span>
+                <a class="button" th:href="@{/attachments/{id}(id=${attachment.id},download=true)}"
+                   th:text="#{task.get.download}"></a>
+            </dt>
+            <dd th:text="${attachment.description}"></dd>
+        </dl>
+        <p>
+            <a th:href="@{/tasks/{username}/list(username=${username})}" th:text="#{task.get.list}"></a>
+            <a th:href="@{/tasks/{username}/get/{id}/attach(username=${username},id=${id})}" th:text="#{task.get.attach}"></a>
+        </p>
+    </body>
+</html>
--- a/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/task-list.html
+++ b/spring-dispatcher-servlet/src/main/webapp/WEB-INF/views/task-list.html
@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+    <head>
+        <title th:text="#{task.list.title(${username})}"></title>
+        <link rel="stylesheet" type="text/css" href="/public/css/base.css">
+        <link rel="stylesheet" type="text/css" th:href="${#themes.code('stylesheet')}">
+    </head>
+    <body>
+        <h2 th:text="#{task.list.header(${username})}"></h2>
+        <ul>
+            <li th:each="task : ${tasks}">
+                <p th:text="*{task.due}"></p>
+                <p th:text="*{task.description}"></p>
+                <a th:href="@{/tasks/{username}/get/{id}(username=${username},id=${taskStat.index})}" th:text="#{task.list.details}"></a>
+            </li>
+        </ul>
+        <p>
+            <a th:href="@{/}" th:text="#{task.list.home}"></a>
+            <a th:href="@{/tasks/{username}/add(username=${username})}" th:text="#{task.list.add-new}"></a>
+        </p>
+    </body>
+</html>
--- a/spring-dispatcher-servlet/src/main/webapp/public/css/base.css
+++ b/spring-dispatcher-servlet/src/main/webapp/public/css/base.css
@ -0,0 +1,8 @@
+a.button {
+    -webkit-appearance: button;
+    -moz-appearance: button;
+    appearance: button;
+    text-decoration: none;
+    color: #2196f3;
+    background-color: #e0e0e0;
+}
--- a/spring-dispatcher-servlet/src/main/webapp/public/css/themes/post_it.css
+++ b/spring-dispatcher-servlet/src/main/webapp/public/css/themes/post_it.css
@ -0,0 +1,8 @@
+@import url('https://fonts.googleapis.com/css?family=Indie+Flower');
+
+* {
+    font-family: 'Indie Flower', sans-serif;
+    font-size: 18px;
+    color: #ffeb3b;
+    background-color: #212121;
+}
--- a/spring-dispatcher-servlet/src/main/webapp/public/css/themes/robotask.css
+++ b/spring-dispatcher-servlet/src/main/webapp/public/css/themes/robotask.css
@ -0,0 +1,8 @@
+@import url('https://fonts.googleapis.com/css?family=Roboto');
+
+* {
+    font-family: Roboto, sans-serif;
+    font-size: 1em;
+    color: #212121;
+    background-color: #fafafa;
+}
--- a/spring-jpa/README.md
+++ b/spring-jpa/README.md
@ -13,5 +13,12 @@
 - [Hibernate Second-Level Cache](http://www.baeldung.com/hibernate-second-level-cache)
 - [Spring, Hibernate and a JNDI Datasource](http://www.baeldung.com/spring-persistence-jpa-jndi-datasource)

-To ignore "No persistence xml file found in project", you do:
-Project -> Properties -> Java Persistance -> JPA -> Error/Warnings -> Select Ignore on "No persistence xml file found in project"
+### Eclipse Config 
+After importing the project into Eclipse, you may see the following error:  
+"No persistence xml file found in project"
+
+This can be ignored: 
+- Project -> Properties -> Java Persistance -> JPA -> Error/Warnings -> Select Ignore on "No persistence xml file found in project"
+Or: 
+- Eclipse -> Preferences - Validation - disable the "Build" execution of the JPA Validator 
+
--- a/spring-mvc-xml/src/main/java/com/baeldung/spring/controller/ErrorController.java
+++ b/spring-mvc-xml/src/main/java/com/baeldung/spring/controller/ErrorController.java
@ -0,0 +1,52 @@
+package com.baeldung.spring.controller;
+
+import javax.servlet.http.HttpServletRequest;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.servlet.ModelAndView;
+
+@Controller
+public class ErrorController {
+    
+    @RequestMapping(value = "500Error", method = RequestMethod.GET)
+    public void throwRuntimeException() {
+        throw new NullPointerException("Throwing a null pointer exception");
+    }
+
+    @RequestMapping(value = "errors", method = RequestMethod.GET)
+    public ModelAndView renderErrorPage(HttpServletRequest httpRequest) {
+        ModelAndView errorPage = new ModelAndView("errorPage");
+        String errorMsg = "";
+        int httpErrorCode = getErrorCode(httpRequest);
+
+        switch (httpErrorCode) {
+        case 400: {
+            errorMsg = "Http Error Code : 400 . Bad Request";
+            break;
+        }
+        case 401: {
+            errorMsg = "Http Error Code : 401. Unauthorized";
+            break;
+        }
+        case 404: {
+            errorMsg = "Http Error Code : 404. Resource not found";
+            break;
+        }
+            // Handle other 4xx error codes.
+        case 500: {
+            errorMsg = "Http Error Code : 500. Internal Server Error";
+            break;
+        }
+            // Handle other 5xx error codes.
+        }
+        errorPage.addObject("errorMsg", errorMsg);
+        return errorPage;
+    }
+
+    private int getErrorCode(HttpServletRequest httpRequest) {
+        return (Integer) httpRequest
+                .getAttribute("javax.servlet.error.status_code");
+    }
+}
--- a/spring-mvc-xml/src/main/webapp/WEB-INF/view/errorPage.jsp
+++ b/spring-mvc-xml/src/main/webapp/WEB-INF/view/errorPage.jsp
@ -0,0 +1,10 @@
+<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
+<%@ page session="false"%>
+<html>
+<head>
+    <title>Home</title>
+</head>
+<body>
+    <h1>${errorMsg}</h1>
+</body>
+</html>
--- a/spring-mvc-xml/src/main/webapp/WEB-INF/web.xml
+++ b/spring-mvc-xml/src/main/webapp/WEB-INF/web.xml
@ -43,4 +43,7 @@
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

+    <error-page>
+        <location>/errors</location>
+    </error-page>
 </web-app>
--- a/spring-rest/pom.xml
+++ b/spring-rest/pom.xml
@ -332,5 +332,17 @@
        <com.squareup.okhttp3.version>3.4.1</com.squareup.okhttp3.version>

    </properties>
-
+	<reporting>
+        <plugins>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>findbugs-maven-plugin</artifactId>
+                <version>3.0.4</version>
+                <configuration>
+                    <effort>Max</effort>
+                    <omitVisitors>FindDeadLocalStores,FindNullDeref</omitVisitors>
+                </configuration>
+            </plugin>
+        </plugins>
+    </reporting>
 </project>
--- a/spring-thymeleaf/README.md
+++ b/spring-thymeleaf/README.md
@ -2,15 +2,16 @@

 ## Spring Thymeleaf Example Project

-
 ### Relevant Articles: 
 - [Introduction to Using Thymeleaf in Spring](http://www.baeldung.com/thymeleaf-in-spring-mvc)
 - [CSRF Protection with Spring MVC and Thymeleaf](http://www.baeldung.com/csrf-thymeleaf-with-spring-security)

+
 ### Build the Project

 mvn clean install

+
 ### Run the Project
 mvn cargo:run
 - **note**: starts on port '8082'
--- a/testing/README.md
+++ b/testing/README.md
@ -5,4 +5,4 @@
 ### Relevant Articles: 
 - [Introduction to Mutation Testing Using the PITest Library](http://www.baeldung.com/java-mutation-testing-with-pitest)
 - [Intro to JaCoCo](http://www.baeldung.com/jacoco)
- [Mutation Testing with PITest](http://www.baeldung.com/java-mutation-testing-with-pitest)
+