diff --git a/spring-katharsis/pom.xml b/spring-katharsis/pom.xml
index 3aeaa973af..674d9a2a14 100644
--- a/spring-katharsis/pom.xml
+++ b/spring-katharsis/pom.xml
@@ -10,9 +10,9 @@
 
     <parent>
         <groupId>com.baeldung</groupId>
-        <artifactId>parent-boot-1</artifactId>
+        <artifactId>parent-boot-2</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../parent-boot-1</relativePath>
+        <relativePath>../parent-boot-2</relativePath>
     </parent>
 
     <dependencies>
diff --git a/spring-katharsis/src/main/java/com/baeldung/Application.java b/spring-katharsis/src/main/java/com/baeldung/Application.java
index 6c4f047b26..738afa039e 100644
--- a/spring-katharsis/src/main/java/com/baeldung/Application.java
+++ b/spring-katharsis/src/main/java/com/baeldung/Application.java
@@ -4,7 +4,7 @@ import io.katharsis.spring.boot.v3.KatharsisConfigV3;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.web.support.SpringBootServletInitializer;
+import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
 import org.springframework.context.annotation.Import;
 
 @SpringBootApplication
diff --git a/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/RoleResourceRepository.java b/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/RoleResourceRepository.java
index c5e6326075..a249def128 100644
--- a/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/RoleResourceRepository.java
+++ b/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/RoleResourceRepository.java
@@ -7,6 +7,9 @@ import io.katharsis.repository.ResourceRepositoryV2;
 import io.katharsis.resource.list.ResourceList;
 
 import com.baeldung.persistence.model.Role;
+
+import java.util.Optional;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
@@ -17,7 +20,8 @@ public class RoleResourceRepository implements ResourceRepositoryV2<Role, Long>
 
     @Override
     public Role findOne(Long id, QuerySpec querySpec) {
-        return roleRepository.findOne(id);
+        Optional<Role> role = roleRepository.findById(id); 
+        return role.isPresent()? role.get() : null;
     }
 
     @Override
@@ -27,7 +31,7 @@ public class RoleResourceRepository implements ResourceRepositoryV2<Role, Long>
 
     @Override
     public ResourceList<Role> findAll(Iterable<Long> ids, QuerySpec querySpec) {
-        return querySpec.apply(roleRepository.findAll(ids));
+        return querySpec.apply(roleRepository.findAllById(ids));
     }
 
     @Override
@@ -37,7 +41,7 @@ public class RoleResourceRepository implements ResourceRepositoryV2<Role, Long>
 
     @Override
     public void delete(Long id) {
-        roleRepository.delete(id);
+        roleRepository.deleteById(id);
     }
 
     @Override
diff --git a/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/UserResourceRepository.java b/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/UserResourceRepository.java
index 616431f3f0..af71da4727 100644
--- a/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/UserResourceRepository.java
+++ b/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/UserResourceRepository.java
@@ -6,6 +6,8 @@ import io.katharsis.queryspec.QuerySpec;
 import io.katharsis.repository.ResourceRepositoryV2;
 import io.katharsis.resource.list.ResourceList;
 
+import java.util.Optional;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
@@ -17,7 +19,8 @@ public class UserResourceRepository implements ResourceRepositoryV2<User, Long>
 
     @Override
     public User findOne(Long id, QuerySpec querySpec) {
-        return userRepository.findOne(id);
+        Optional<User> user = userRepository.findById(id); 
+        return user.isPresent()? user.get() : null;
     }
 
     @Override
@@ -27,7 +30,7 @@ public class UserResourceRepository implements ResourceRepositoryV2<User, Long>
 
     @Override
     public ResourceList<User> findAll(Iterable<Long> ids, QuerySpec querySpec) {
-        return querySpec.apply(userRepository.findAll(ids));
+        return querySpec.apply(userRepository.findAllById(ids));
     }
 
     @Override
@@ -37,7 +40,7 @@ public class UserResourceRepository implements ResourceRepositoryV2<User, Long>
 
     @Override
     public void delete(Long id) {
-        userRepository.delete(id);
+        userRepository.deleteById(id);
     }
 
     @Override
diff --git a/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/UserToRoleRelationshipRepository.java b/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/UserToRoleRelationshipRepository.java
index 066292c00f..d0b4a464c9 100644
--- a/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/UserToRoleRelationshipRepository.java
+++ b/spring-katharsis/src/main/java/com/baeldung/persistence/katharsis/UserToRoleRelationshipRepository.java
@@ -8,6 +8,7 @@ import io.katharsis.repository.RelationshipRepositoryV2;
 import io.katharsis.resource.list.ResourceList;
 
 import java.util.HashSet;
+import java.util.Optional;
 import java.util.Set;
 
 import com.baeldung.persistence.model.Role;
@@ -31,7 +32,7 @@ public class UserToRoleRelationshipRepository implements RelationshipRepositoryV
     @Override
     public void setRelations(User user, Iterable<Long> roleIds, String fieldName) {
         final Set<Role> roles = new HashSet<Role>();
-        roles.addAll(roleRepository.findAll(roleIds));
+        roles.addAll(roleRepository.findAllById(roleIds));
         user.setRoles(roles);
         userRepository.save(user);
     }
@@ -39,7 +40,7 @@ public class UserToRoleRelationshipRepository implements RelationshipRepositoryV
     @Override
     public void addRelations(User user, Iterable<Long> roleIds, String fieldName) {
         final Set<Role> roles = user.getRoles();
-        roles.addAll(roleRepository.findAll(roleIds));
+        roles.addAll(roleRepository.findAllById(roleIds));
         user.setRoles(roles);
         userRepository.save(user);
     }
@@ -47,7 +48,7 @@ public class UserToRoleRelationshipRepository implements RelationshipRepositoryV
     @Override
     public void removeRelations(User user, Iterable<Long> roleIds, String fieldName) {
         final Set<Role> roles = user.getRoles();
-        roles.removeAll(roleRepository.findAll(roleIds));
+        roles.removeAll(roleRepository.findAllById(roleIds));
         user.setRoles(roles);
         userRepository.save(user);
     }
@@ -60,7 +61,8 @@ public class UserToRoleRelationshipRepository implements RelationshipRepositoryV
 
     @Override
     public ResourceList<Role> findManyTargets(Long sourceId, String fieldName, QuerySpec querySpec) {
-        final User user = userRepository.findOne(sourceId);
+        final Optional<User> userOptional = userRepository.findById(sourceId);
+        User user = userOptional.isPresent() ? userOptional.get() : new User();
         return  querySpec.apply(user.getRoles());
     }
 
diff --git a/spring-katharsis/src/main/resources/application.properties b/spring-katharsis/src/main/resources/application.properties
index 120b3c62ee..415ec1723b 100644
--- a/spring-katharsis/src/main/resources/application.properties
+++ b/spring-katharsis/src/main/resources/application.properties
@@ -6,7 +6,7 @@ spring.jpa.hibernate.ddl-auto = create-drop
 spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.H2Dialect
 
 server.port=8082
-server.context-path=/spring-katharsis
+server.servlet.context-path=/spring-katharsis
 
 katharsis.domainName=http://localhost:8082/spring-katharsis
 katharsis.pathPrefix=/
\ No newline at end of file