diff --git a/dev-1/lesson-2.1/java/pom.xml b/dev-1/lesson-2.1/java/pom.xml
index 04b393d..080efe3 100644
--- a/dev-1/lesson-2.1/java/pom.xml
+++ b/dev-1/lesson-2.1/java/pom.xml
@@ -18,6 +18,7 @@
 
     <dependencyManagement>
         <dependencies>
+            <!-- Import the YDB BOM which manages compatible versions internally -->
             <dependency>
                 <groupId>tech.ydb</groupId>
                 <artifactId>ydb-sdk-bom</artifactId>
@@ -29,10 +30,25 @@
     </dependencyManagement>
 
     <dependencies>
+        <!-- Core query module of YDB SDK -->
         <dependency>
             <groupId>tech.ydb</groupId>
             <artifactId>ydb-sdk-query</artifactId>
         </dependency>
+
+        <dependency>
+            <groupId>tech.ydb.auth</groupId>
+            <artifactId>yc-auth-provider</artifactId>
+        </dependency>
+
+        <!-- Needed for YDB's gRPC transport -->
+        <dependency>
+            <groupId>io.grpc</groupId>
+            <artifactId>grpc-netty-shaded</artifactId>
+            <version>1.60.1</version> <!-- This version is OK for YDB 2.3.8 -->
+        </dependency>
+
+        <!-- Logging with Log4j over SLF4J -->
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-slf4j-impl</artifactId>
@@ -41,25 +57,66 @@
     </dependencies>
 
     <build>
-        <pluginManagement>
-            <plugins>
-                <plugin>
-                    <groupId>org.apache.maven.plugins</groupId>
-                    <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.12.1</version>
-                    <configuration>
-                        <source>21</source>
-                    </configuration>
-                    <executions>
-                        <execution>
-                            <id>attach-javadocs</id>
-                            <goals>
-                                <goal>jar</goal>
-                            </goals>
-                        </execution>
-                    </executions>
-                </plugin>
-            </plugins>
-        </pluginManagement>
+        <plugins>
+            <!-- Compiler plugin -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.12.1</version>
+                <configuration>
+                    <source>21</source>
+                    <target>21</target>
+                </configuration>
+            </plugin>
+
+            <!-- JAR plugin -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <version>3.3.0</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <mainClass>tech.ydb.app.Application</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+
+            <!-- Shade plugin to build fat JAR -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>3.5.1</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals><goal>shade</goal></goals>
+                        <configuration>
+                            <createDependencyReducedPom>false</createDependencyReducedPom>
+                            <filters>
+                                <!-- Exclude signature files to avoid SecurityException -->
+                                <filter>
+                                    <artifact>*:*</artifact>
+                                    <excludes>
+                                        <exclude>META-INF/*.SF</exclude>
+                                        <exclude>META-INF/*.DSA</exclude>
+                                        <exclude>META-INF/*.RSA</exclude>
+                                    </excludes>
+                                </filter>
+                            </filters>
+                            <transformers>
+                                <!-- Merge service files so ServiceLoader works -->
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
+                                <!-- Set the correct main class -->
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                    <mainClass>tech.ydb.app.Application</mainClass>
+                                </transformer>
+                            </transformers>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
     </build>
 </project>
diff --git a/dev-1/lesson-2.1/java/src/main/java/tech/ydb/app/Application.java b/dev-1/lesson-2.1/java/src/main/java/tech/ydb/app/Application.java
index 7167f77..cfe75ec 100644
--- a/dev-1/lesson-2.1/java/src/main/java/tech/ydb/app/Application.java
+++ b/dev-1/lesson-2.1/java/src/main/java/tech/ydb/app/Application.java
@@ -3,6 +3,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import tech.ydb.common.transaction.TxMode;
+import tech.ydb.core.auth.EnvironAuthProvider;
 import tech.ydb.core.grpc.GrpcTransport;
 import tech.ydb.query.QueryClient;
 import tech.ydb.query.tools.QueryReader;
@@ -21,13 +22,15 @@ public class Application {
      * Строка подключения к локальной базе данных YDB
      * Формат: grpc://<хост>:<порт>/<путь к базе данных>
      */
-    private static final String CONNECTION_STRING = "grpc://localhost:2136/local";
+    private static final String CONNECTION_STRING = "grpcs://lb.etnbl54v62l9q2n3nae6.ydb.mdb.yandexcloud.net:2135/ru-central1/b1gr3pr7d18v5t9o681u/etnbl54v62l9q2n3nae6";
+//    private static final String CONNECTION_STRING = "grpc://127.0.0.1:2136/local";
 
     public static void main(String[] args) {
         // Создаем драйвер для подключения к YDB через gRPC
         try (GrpcTransport grpcTransport = GrpcTransport
                 .forConnectionString(CONNECTION_STRING)
                 .withConnectTimeout(Duration.ofSeconds(10))
+                .withAuthProvider(new EnvironAuthProvider())
                 .build()
         ) {
             // Создаем клиент для выполнения SQL-запросов
diff --git a/dev-1/lesson-3.1/java/pom.xml b/dev-1/lesson-3.1/java/pom.xml
index 5a18162..d152b80 100644
--- a/dev-1/lesson-3.1/java/pom.xml
+++ b/dev-1/lesson-3.1/java/pom.xml
@@ -46,14 +46,18 @@
                     <configuration>
                         <source>21</source>
                     </configuration>
-                    <executions>
-                        <execution>
-                            <id>attach-javadocs</id>
-                            <goals>
-                                <goal>jar</goal>
-                            </goals>
-                        </execution>
-                    </executions>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-jar-plugin</artifactId>
+                    <version>3.3.0</version>
+                    <configuration>
+                        <archive>
+                            <manifest>
+                                <mainClass>tech.ydb.app.Application</mainClass> <!-- change to your actual main class -->
+                            </manifest>
+                        </archive>
+                    </configuration>
                 </plugin>
             </plugins>
         </pluginManagement>
diff --git a/dev-1/lesson-3.1/java/src/main/java/tech/ydb/app/IssueYdbRepository.java b/dev-1/lesson-3.1/java/src/main/java/tech/ydb/app/IssueYdbRepository.java
index e8e73e6..1194efe 100644
--- a/dev-1/lesson-3.1/java/src/main/java/tech/ydb/app/IssueYdbRepository.java
+++ b/dev-1/lesson-3.1/java/src/main/java/tech/ydb/app/IssueYdbRepository.java
@@ -72,8 +72,10 @@ public List<Issue> findAll() {
         // Этот режим сообщает серверу, что это транзакция только для чтения.
         // Это позволяет снизить накладные расходы на подготовку к изменениям и просто читать данные из 
         // одного снимка базы данных.
-        var resultSet = queryServiceHelper.executeQuery("SELECT id, title, created_at FROM issues;",
-                TxMode.SNAPSHOT_RO, Params.empty());
+        var resultSet = queryServiceHelper.executeQuery(
+                "DECLARE $prefix AS Text; SELECT id, title, created_at FROM issues WHERE title LIKE $prefix;",
+                TxMode.SNAPSHOT_RO,
+                Params.of("$prefix", PrimitiveValue.newText("Ticket 1")));
 
         var resultSetReader = resultSet.getResultSet(0);
 
diff --git a/dev-1/lesson-4.1/java/pom.xml b/dev-1/lesson-4.1/java/pom.xml
index a3a3809..fa981b8 100644
--- a/dev-1/lesson-4.1/java/pom.xml
+++ b/dev-1/lesson-4.1/java/pom.xml
@@ -46,14 +46,18 @@
                     <configuration>
                         <source>21</source>
                     </configuration>
-                    <executions>
-                        <execution>
-                            <id>attach-javadocs</id>
-                            <goals>
-                                <goal>jar</goal>
-                            </goals>
-                        </execution>
-                    </executions>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-jar-plugin</artifactId>
+                    <version>3.3.0</version>
+                    <configuration>
+                        <archive>
+                            <manifest>
+                                <mainClass>tech.ydb.app.Application</mainClass> <!-- change to your actual main class -->
+                            </manifest>
+                        </archive>
+                    </configuration>
                 </plugin>
             </plugins>
         </pluginManagement>
diff --git a/dev-1/lesson-5.1/java/pom.xml b/dev-1/lesson-5.1/java/pom.xml
index 2d509cf..1fe1034 100644
--- a/dev-1/lesson-5.1/java/pom.xml
+++ b/dev-1/lesson-5.1/java/pom.xml
@@ -46,14 +46,18 @@
                     <configuration>
                         <source>21</source>
                     </configuration>
-                    <executions>
-                        <execution>
-                            <id>attach-javadocs</id>
-                            <goals>
-                                <goal>jar</goal>
-                            </goals>
-                        </execution>
-                    </executions>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-jar-plugin</artifactId>
+                    <version>3.3.0</version>
+                    <configuration>
+                        <archive>
+                            <manifest>
+                                <mainClass>tech.ydb.app.Application</mainClass> <!-- change to your actual main class -->
+                            </manifest>
+                        </archive>
+                    </configuration>
                 </plugin>
             </plugins>
         </pluginManagement>
diff --git a/dev-1/lesson-6.1/java/pom.xml b/dev-1/lesson-6.1/java/pom.xml
index 751edda..f01813d 100644
--- a/dev-1/lesson-6.1/java/pom.xml
+++ b/dev-1/lesson-6.1/java/pom.xml
@@ -50,14 +50,18 @@
                     <configuration>
                         <source>21</source>
                     </configuration>
-                    <executions>
-                        <execution>
-                            <id>attach-javadocs</id>
-                            <goals>
-                                <goal>jar</goal>
-                            </goals>
-                        </execution>
-                    </executions>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-jar-plugin</artifactId>
+                    <version>3.3.0</version>
+                    <configuration>
+                        <archive>
+                            <manifest>
+                                <mainClass>tech.ydb.app.Application</mainClass> <!-- change to your actual main class -->
+                            </manifest>
+                        </archive>
+                    </configuration>
                 </plugin>
             </plugins>
         </pluginManagement>