diff --git a/samples/bloggy/pom.xml b/samples/bloggy/pom.xml
index ed495ba..6a88a2b 100644
--- a/samples/bloggy/pom.xml
+++ b/samples/bloggy/pom.xml
@@ -33,7 +33,7 @@
         <dependency>
             <groupId>org.mariadb.jdbc</groupId>
             <artifactId>mariadb-java-client</artifactId>
-            <version>3.1.4</version>
+            <version>3.5.6</version>
         </dependency>
         <dependency>
             <groupId>com.codeforces</groupId>
@@ -41,7 +41,7 @@
             <version>3.0-SNAPSHOT</version>
         </dependency>
     </dependencies>
-    
+
     <build>
         <finalName>bloggy</finalName>
         <resources>
@@ -95,7 +95,7 @@
             <plugin>
                 <groupId>org.basepom.maven</groupId>
                 <artifactId>duplicate-finder-maven-plugin</artifactId>
-                <version>1.5.0</version>
+                <version>2.0.1</version>
                 <executions>
                     <execution>
                         <id>default</id>
@@ -117,15 +117,14 @@
                     <printEqualFiles>false</printEqualFiles>
                     <preferLocal>true</preferLocal>
 
-                    <!-- Version 1.1.1+ -->
-                    <includeBootClasspath>false</includeBootClasspath>
-                    <bootClasspathProperty>sun.boot.class.path</bootClasspathProperty>
-                    <!-- Version 1.1.1+ -->
-
-
                     <!-- Version 1.2.0+ -->
                     <includePomProjects>false</includePomProjects>
                     <!-- Version 1.2.0+ -->
+
+                    <useDefaultResourceIgnoreList>true</useDefaultResourceIgnoreList>
+                    <ignoredClassPatterns>
+                        <ignoredClassPattern>org\.apache\.commons\.logging\..*</ignoredClassPattern>
+                    </ignoredClassPatterns>
                 </configuration>
             </plugin>
         </plugins>
diff --git a/samples/bloggy/src/main/java/bloggy/ApplicationModule.java b/samples/bloggy/src/main/java/bloggy/ApplicationModule.java
index 2e097b7..24f987d 100644
--- a/samples/bloggy/src/main/java/bloggy/ApplicationModule.java
+++ b/samples/bloggy/src/main/java/bloggy/ApplicationModule.java
@@ -1,14 +1,5 @@
 package bloggy;
 
-import com.codeforces.commons.io.http.HttpMethod;
-import com.codeforces.commons.text.StringUtil;
-import com.google.inject.Binder;
-import com.google.inject.Module;
-import com.google.inject.matcher.AbstractMatcher;
-import org.aopalliance.intercept.MethodInterceptor;
-import org.nocturne.link.Links;
-import org.nocturne.main.ApplicationContext;
-import org.nocturne.main.Component;
 import bloggy.captions.dao.CaptionDao;
 import bloggy.captions.dao.impl.CaptionDaoImpl;
 import bloggy.dao.DateDao;
@@ -19,6 +10,14 @@
 import bloggy.dao.impl.UserDaoImpl;
 import bloggy.web.annotation.PostOnly;
 import bloggy.web.page.IndexPage;
+import com.codeforces.commons.io.http.HttpMethod;
+import com.codeforces.commons.text.StringUtil;
+import com.google.inject.Binder;
+import com.google.inject.Module;
+import com.google.inject.matcher.AbstractMatcher;
+import org.nocturne.link.Links;
+import org.nocturne.main.ApplicationContext;
+import org.nocturne.main.Component;
 
 import javax.servlet.http.HttpServletRequest;
 import java.lang.reflect.Method;
@@ -34,12 +33,12 @@ public void configure(Binder binder) {
         binder.bind(UserDao.class).to(UserDaoImpl.class);
         binder.bind(PostDao.class).to(PostDaoImpl.class);
 
-        binder.bindInterceptor(new AbstractMatcher<Class<?>>() {
+        binder.bindInterceptor(new AbstractMatcher<>() {
             @Override
             public boolean matches(Class<?> aClass) {
                 return Component.class.isAssignableFrom(aClass);
             }
-        }, new AbstractMatcher<Method>() {
+        }, new AbstractMatcher<>() {
             @Override
             public boolean matches(Method method) {
                 return method.getAnnotation(PostOnly.class) != null;
diff --git a/samples/bloggy/src/main/java/bloggy/ApplicationPageRequestListener.java b/samples/bloggy/src/main/java/bloggy/ApplicationPageRequestListener.java
index 7ceb670..1ff1825 100644
--- a/samples/bloggy/src/main/java/bloggy/ApplicationPageRequestListener.java
+++ b/samples/bloggy/src/main/java/bloggy/ApplicationPageRequestListener.java
@@ -3,13 +3,13 @@
  */
 package bloggy;
 
+import bloggy.web.page.WebPage;
 import com.codeforces.commons.exception.ExceptionUtil;
 import freemarker.template.Template;
 import freemarker.template.TemplateException;
 import org.apache.log4j.Logger;
 import org.nocturne.listener.PageRequestListener;
 import org.nocturne.main.Page;
-import bloggy.web.page.WebPage;
 
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
@@ -50,7 +50,8 @@ public void afterProcessPage(Page page, Throwable t) {
             addRequestParameters(page, paramsDump);
             addRequestAttributes(page, paramsDump);
 
-            t.printStackTrace();
+            t.printStackTrace(System.out);
+            t.printStackTrace(System.err);
         }
 
         if (t != null && page instanceof WebPage) {
diff --git a/samples/bloggy/src/main/java/bloggy/ApplicationRequestRouter.java b/samples/bloggy/src/main/java/bloggy/ApplicationRequestRouter.java
index ef4e512..0b675cd 100644
--- a/samples/bloggy/src/main/java/bloggy/ApplicationRequestRouter.java
+++ b/samples/bloggy/src/main/java/bloggy/ApplicationRequestRouter.java
@@ -1,8 +1,8 @@
 package bloggy;
 
+import bloggy.web.page.*;
 import org.nocturne.link.Links;
 import org.nocturne.main.LinkedRequestRouter;
-import bloggy.web.page.*;
 
 /**
  * @author Mike Mirzayanov
diff --git a/samples/bloggy/src/main/java/bloggy/NginxFilter.java b/samples/bloggy/src/main/java/bloggy/NginxFilter.java
index 2a42895..b9267cb 100644
--- a/samples/bloggy/src/main/java/bloggy/NginxFilter.java
+++ b/samples/bloggy/src/main/java/bloggy/NginxFilter.java
@@ -20,9 +20,7 @@ public void init(FilterConfig filterConfig) {
 
     @Override
     public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
-        if (request instanceof HttpServletRequest) {
-            HttpServletRequest httpRequest = (HttpServletRequest) request;
-
+        if (request instanceof HttpServletRequest httpRequest) {
             String ip = httpRequest.getHeader(X_REAL_IP);
             String host = httpRequest.getHeader(X_FORWARDED_FOR);
 
diff --git a/samples/bloggy/src/main/java/bloggy/PreprocessFilter.java b/samples/bloggy/src/main/java/bloggy/PreprocessFilter.java
index f1817b3..e09b162 100644
--- a/samples/bloggy/src/main/java/bloggy/PreprocessFilter.java
+++ b/samples/bloggy/src/main/java/bloggy/PreprocessFilter.java
@@ -3,8 +3,8 @@
  */
 package bloggy;
 
-import org.jacuzzi.core.Jacuzzi;
 import bloggy.database.ApplicationDataSource;
+import org.jacuzzi.core.Jacuzzi;
 
 import javax.servlet.*;
 import java.io.IOException;
diff --git a/samples/bloggy/src/main/java/bloggy/StaticFilter.java b/samples/bloggy/src/main/java/bloggy/StaticFilter.java
index c9395fc..e311e4c 100644
--- a/samples/bloggy/src/main/java/bloggy/StaticFilter.java
+++ b/samples/bloggy/src/main/java/bloggy/StaticFilter.java
@@ -2,7 +2,6 @@
 
 import com.codeforces.commons.properties.PropertiesUtil;
 import com.codeforces.commons.text.StringUtil;
-import org.nocturne.main.ApplicationContext;
 
 import javax.servlet.*;
 import javax.servlet.http.HttpServletRequest;
@@ -38,10 +37,9 @@ public void init(FilterConfig filterConfig) {
 
     @Override
     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
-        if (ENABLED && request instanceof HttpServletRequest && response instanceof HttpServletResponse) {
-            HttpServletRequest httpServletRequest = (HttpServletRequest) request;
-            HttpServletResponse httpServletResponse = (HttpServletResponse) response;
-
+        if (ENABLED
+                && request instanceof HttpServletRequest httpServletRequest
+                && response instanceof HttpServletResponse httpServletResponse) {
             String requestURI = httpServletRequest.getRequestURI();
             if (isResourceRequestUri(requestURI)) {
                 File file = new File(STATIC_SRC_PATH, requestURI);
diff --git a/samples/bloggy/src/main/java/bloggy/captions/CaptionsImpl.java b/samples/bloggy/src/main/java/bloggy/captions/CaptionsImpl.java
index b8ff05e..3e92652 100644
--- a/samples/bloggy/src/main/java/bloggy/captions/CaptionsImpl.java
+++ b/samples/bloggy/src/main/java/bloggy/captions/CaptionsImpl.java
@@ -3,12 +3,12 @@
  */
 package bloggy.captions;
 
+import bloggy.captions.dao.CaptionDao;
+import bloggy.captions.model.Caption;
 import com.google.common.base.Strings;
 import com.google.inject.Inject;
 import org.nocturne.caption.Captions;
 import org.nocturne.main.ApplicationContext;
-import bloggy.captions.dao.CaptionDao;
-import bloggy.captions.model.Caption;
 
 import java.text.MessageFormat;
 import java.util.Locale;
diff --git a/samples/bloggy/src/main/java/bloggy/captions/dao/CaptionDao.java b/samples/bloggy/src/main/java/bloggy/captions/dao/CaptionDao.java
index f75f47b..81061e1 100644
--- a/samples/bloggy/src/main/java/bloggy/captions/dao/CaptionDao.java
+++ b/samples/bloggy/src/main/java/bloggy/captions/dao/CaptionDao.java
@@ -5,8 +5,6 @@
 
 import bloggy.captions.model.Caption;
 
-import java.util.List;
-
 public interface CaptionDao {
     String shaHex(String s);
     Caption find(String shortcutSha1, String locale);
diff --git a/samples/bloggy/src/main/java/bloggy/captions/dao/impl/CaptionDaoImpl.java b/samples/bloggy/src/main/java/bloggy/captions/dao/impl/CaptionDaoImpl.java
index e2a7bbe..900a692 100644
--- a/samples/bloggy/src/main/java/bloggy/captions/dao/impl/CaptionDaoImpl.java
+++ b/samples/bloggy/src/main/java/bloggy/captions/dao/impl/CaptionDaoImpl.java
@@ -3,6 +3,10 @@
  */
 package bloggy.captions.dao.impl;
 
+import bloggy.captions.TemplateEngineConfigurations;
+import bloggy.captions.dao.CaptionDao;
+import bloggy.captions.model.Caption;
+import bloggy.dao.impl.ApplicationDaoImpl;
 import com.codeforces.commons.text.StringUtil;
 import com.google.inject.Singleton;
 import freemarker.cache.SoftCacheStorage;
@@ -10,10 +14,6 @@
 import org.apache.commons.codec.digest.DigestUtils;
 import org.apache.log4j.Logger;
 import org.nocturne.main.ApplicationContext;
-import bloggy.captions.TemplateEngineConfigurations;
-import bloggy.captions.dao.CaptionDao;
-import bloggy.captions.model.Caption;
-import bloggy.dao.impl.ApplicationDaoImpl;
 
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
diff --git a/samples/bloggy/src/main/java/bloggy/dao/impl/ApplicationDaoImpl.java b/samples/bloggy/src/main/java/bloggy/dao/impl/ApplicationDaoImpl.java
index 9241246..abe6081 100644
--- a/samples/bloggy/src/main/java/bloggy/dao/impl/ApplicationDaoImpl.java
+++ b/samples/bloggy/src/main/java/bloggy/dao/impl/ApplicationDaoImpl.java
@@ -1,8 +1,8 @@
 package bloggy.dao.impl;
 
-import org.jacuzzi.core.GenericDaoImpl;
 import bloggy.database.ApplicationDataSource;
 import bloggy.model.Entity;
+import org.jacuzzi.core.GenericDaoImpl;
 
 import java.util.Date;
 import java.util.List;
diff --git a/samples/bloggy/src/main/java/bloggy/dao/impl/PostDaoImpl.java b/samples/bloggy/src/main/java/bloggy/dao/impl/PostDaoImpl.java
index d9da44b..78751d7 100644
--- a/samples/bloggy/src/main/java/bloggy/dao/impl/PostDaoImpl.java
+++ b/samples/bloggy/src/main/java/bloggy/dao/impl/PostDaoImpl.java
@@ -1,9 +1,9 @@
 package bloggy.dao.impl;
 
-import com.google.inject.Singleton;
 import bloggy.dao.PostDao;
 import bloggy.model.Post;
 import bloggy.model.User;
+import com.google.inject.Singleton;
 
 import java.util.List;
 
diff --git a/samples/bloggy/src/main/java/bloggy/dao/impl/UserDaoImpl.java b/samples/bloggy/src/main/java/bloggy/dao/impl/UserDaoImpl.java
index 155777b..523e262 100644
--- a/samples/bloggy/src/main/java/bloggy/dao/impl/UserDaoImpl.java
+++ b/samples/bloggy/src/main/java/bloggy/dao/impl/UserDaoImpl.java
@@ -1,8 +1,8 @@
 package bloggy.dao.impl;
 
-import com.google.inject.Singleton;
 import bloggy.dao.UserDao;
 import bloggy.model.User;
+import com.google.inject.Singleton;
 
 @Singleton
 public class UserDaoImpl extends ApplicationDaoImpl<User> implements UserDao {
diff --git a/samples/bloggy/src/main/java/bloggy/database/ApplicationDataSource.java b/samples/bloggy/src/main/java/bloggy/database/ApplicationDataSource.java
index 42c4fc4..9726c6f 100644
--- a/samples/bloggy/src/main/java/bloggy/database/ApplicationDataSource.java
+++ b/samples/bloggy/src/main/java/bloggy/database/ApplicationDataSource.java
@@ -3,8 +3,8 @@
  */
 package bloggy.database;
 
-import org.apache.log4j.Logger;
 import bloggy.exception.ApplicationException;
+import org.apache.log4j.Logger;
 import org.mariadb.jdbc.MariaDbDataSource;
 
 import javax.annotation.Nonnull;
diff --git a/samples/bloggy/src/main/java/bloggy/exception/ApplicationException.java b/samples/bloggy/src/main/java/bloggy/exception/ApplicationException.java
index 7790312..b985363 100644
--- a/samples/bloggy/src/main/java/bloggy/exception/ApplicationException.java
+++ b/samples/bloggy/src/main/java/bloggy/exception/ApplicationException.java
@@ -1,5 +1,6 @@
 package bloggy.exception;
 
+@SuppressWarnings("unused")
 public class ApplicationException extends RuntimeException {
     public ApplicationException(String message) {
         super(message);
diff --git a/samples/bloggy/src/main/java/bloggy/model/Entity.java b/samples/bloggy/src/main/java/bloggy/model/Entity.java
index e0a9fa0..30ac6ba 100644
--- a/samples/bloggy/src/main/java/bloggy/model/Entity.java
+++ b/samples/bloggy/src/main/java/bloggy/model/Entity.java
@@ -21,6 +21,7 @@ public void setId(long id) {
         this.id = id;
     }
 
+    @SuppressWarnings("unused")
     public Date getUpdateTime() {
         return updateTime;
     }
@@ -29,6 +30,7 @@ public void setUpdateTime(Date updateTime) {
         this.updateTime = TimeUtil.toDate(updateTime);
     }
 
+    @SuppressWarnings("unused")
     public Date getCreationTime() {
         return creationTime;
     }
diff --git a/samples/bloggy/src/main/java/bloggy/model/User.java b/samples/bloggy/src/main/java/bloggy/model/User.java
index e191988..953bc6a 100644
--- a/samples/bloggy/src/main/java/bloggy/model/User.java
+++ b/samples/bloggy/src/main/java/bloggy/model/User.java
@@ -8,6 +8,7 @@ public String getLogin() {
         return login;
     }
 
+    @SuppressWarnings("unused")
     public void setLogin(String login) {
         this.login = login;
     }
diff --git a/samples/bloggy/src/main/java/bloggy/web/frame/PostViewFrame.java b/samples/bloggy/src/main/java/bloggy/web/frame/PostViewFrame.java
index 6263fa4..09a48f3 100644
--- a/samples/bloggy/src/main/java/bloggy/web/frame/PostViewFrame.java
+++ b/samples/bloggy/src/main/java/bloggy/web/frame/PostViewFrame.java
@@ -1,9 +1,9 @@
 package bloggy.web.frame;
 
-import com.google.inject.Inject;
 import bloggy.dao.UserDao;
 import bloggy.model.Post;
 import bloggy.model.User;
+import com.google.inject.Inject;
 
 public class PostViewFrame extends ApplicationFrame {
     @Inject
diff --git a/samples/bloggy/src/main/java/bloggy/web/frame/PostsViewFrame.java b/samples/bloggy/src/main/java/bloggy/web/frame/PostsViewFrame.java
index 7de8d5c..d647f6b 100644
--- a/samples/bloggy/src/main/java/bloggy/web/frame/PostsViewFrame.java
+++ b/samples/bloggy/src/main/java/bloggy/web/frame/PostsViewFrame.java
@@ -1,9 +1,9 @@
 package bloggy.web.frame;
 
-import com.google.inject.Inject;
 import bloggy.dao.PostDao;
 import bloggy.model.Post;
 import bloggy.model.User;
+import com.google.inject.Inject;
 
 import java.util.List;
 import java.util.stream.Collectors;
diff --git a/samples/bloggy/src/main/java/bloggy/web/page/ApplicationPage.java b/samples/bloggy/src/main/java/bloggy/web/page/ApplicationPage.java
index e5d3718..65c90c1 100644
--- a/samples/bloggy/src/main/java/bloggy/web/page/ApplicationPage.java
+++ b/samples/bloggy/src/main/java/bloggy/web/page/ApplicationPage.java
@@ -1,10 +1,10 @@
 package bloggy.web.page;
 
+import bloggy.dao.DateDao;
+import bloggy.model.User;
 import com.google.inject.Inject;
 import org.nocturne.main.ApplicationContext;
 import org.nocturne.main.Page;
-import bloggy.dao.DateDao;
-import bloggy.model.User;
 
 public abstract class ApplicationPage extends Page {
     private static final String USER_SESSION_KEY = "user";
diff --git a/samples/bloggy/src/main/java/bloggy/web/page/EnterPage.java b/samples/bloggy/src/main/java/bloggy/web/page/EnterPage.java
index 25ca69c..a46be42 100644
--- a/samples/bloggy/src/main/java/bloggy/web/page/EnterPage.java
+++ b/samples/bloggy/src/main/java/bloggy/web/page/EnterPage.java
@@ -1,5 +1,7 @@
 package bloggy.web.page;
 
+import bloggy.dao.UserDao;
+import bloggy.web.annotation.PostOnly;
 import com.google.inject.Inject;
 import org.nocturne.annotation.Action;
 import org.nocturne.annotation.Parameter;
@@ -8,8 +10,6 @@
 import org.nocturne.validation.RequiredValidator;
 import org.nocturne.validation.ValidationException;
 import org.nocturne.validation.Validator;
-import bloggy.dao.UserDao;
-import bloggy.web.annotation.PostOnly;
 
 @Link("enter")
 public class EnterPage extends WebPage {
diff --git a/samples/bloggy/src/main/java/bloggy/web/page/IndexPage.java b/samples/bloggy/src/main/java/bloggy/web/page/IndexPage.java
index d865ed0..dacadcf 100644
--- a/samples/bloggy/src/main/java/bloggy/web/page/IndexPage.java
+++ b/samples/bloggy/src/main/java/bloggy/web/page/IndexPage.java
@@ -1,8 +1,8 @@
 package bloggy.web.page;
 
+import bloggy.web.frame.PostsViewFrame;
 import com.google.inject.Inject;
 import org.nocturne.link.Link;
-import bloggy.web.frame.PostsViewFrame;
 
 @Link(";index")
 public class IndexPage extends WebPage {
diff --git a/samples/bloggy/src/main/java/bloggy/web/page/LogoutDataPage.java b/samples/bloggy/src/main/java/bloggy/web/page/LogoutDataPage.java
index ea85f05..0b108b3 100644
--- a/samples/bloggy/src/main/java/bloggy/web/page/LogoutDataPage.java
+++ b/samples/bloggy/src/main/java/bloggy/web/page/LogoutDataPage.java
@@ -1,8 +1,8 @@
 package bloggy.web.page;
 
+import bloggy.web.annotation.PostOnly;
 import org.nocturne.annotation.Action;
 import org.nocturne.link.Link;
-import bloggy.web.annotation.PostOnly;
 
 @Link("logout")
 public class LogoutDataPage extends DataPage {
diff --git a/samples/bloggy/src/main/java/bloggy/web/page/MyPostsPage.java b/samples/bloggy/src/main/java/bloggy/web/page/MyPostsPage.java
index b77ccd7..90012c0 100644
--- a/samples/bloggy/src/main/java/bloggy/web/page/MyPostsPage.java
+++ b/samples/bloggy/src/main/java/bloggy/web/page/MyPostsPage.java
@@ -1,10 +1,9 @@
 package bloggy.web.page;
 
-import com.google.inject.Inject;
-import org.nocturne.link.Link;
-import bloggy.dao.PostDao;
 import bloggy.model.User;
 import bloggy.web.frame.PostsViewFrame;
+import com.google.inject.Inject;
+import org.nocturne.link.Link;
 
 @Link("my")
 public class MyPostsPage extends WebPage {
diff --git a/samples/bloggy/src/main/java/bloggy/web/page/PostViewPage.java b/samples/bloggy/src/main/java/bloggy/web/page/PostViewPage.java
index 36a527b..b194387 100644
--- a/samples/bloggy/src/main/java/bloggy/web/page/PostViewPage.java
+++ b/samples/bloggy/src/main/java/bloggy/web/page/PostViewPage.java
@@ -1,11 +1,11 @@
 package bloggy.web.page;
 
-import com.google.inject.Inject;
-import org.nocturne.annotation.Parameter;
-import org.nocturne.link.Link;
 import bloggy.dao.PostDao;
 import bloggy.model.Post;
 import bloggy.web.frame.PostViewFrame;
+import com.google.inject.Inject;
+import org.nocturne.annotation.Parameter;
+import org.nocturne.link.Link;
 
 @Link("post/{postId}")
 public class PostViewPage extends WebPage {
diff --git a/samples/helloworld/pom.xml b/samples/helloworld/pom.xml
index 1514fda..441bdf1 100644
--- a/samples/helloworld/pom.xml
+++ b/samples/helloworld/pom.xml
@@ -29,6 +29,18 @@
                     </requestLog>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-war-plugin</artifactId>
+                <version>3.5.1</version>
+                <configuration>
+                    <webResources>
+                        <resource>
+                            <directory>src/main/webapp</directory>
+                        </resource>
+                    </webResources>
+                </configuration>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
diff --git a/samples/helloworld/src/main/webapp/WEB-INF/templates/IndexPage.ftl b/samples/helloworld/src/main/webapp/WEB-INF/templates/IndexPage.ftl
index 38555bd..7376c9e 100644
--- a/samples/helloworld/src/main/webapp/WEB-INF/templates/IndexPage.ftl
+++ b/samples/helloworld/src/main/webapp/WEB-INF/templates/IndexPage.ftl
@@ -2,7 +2,7 @@
 <#-- @ftlvariable name="home" type="java.lang.String" -->
 <#setting url_escaping_charset='UTF-8'>
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
-<html>
+<html lang="en">
 <head>
     <meta http-equiv="Pragma" content="no-cache">
     <meta http-equiv="Expires" content="-1">