[DAT-17036] Fix incorrect error

src/main/java/liquibase/ext/mongodb/database/MongoConnection.java

@@ -77,7 +77,7 @@ public boolean supports(String url) {
         return isMongodbConnection;
     }
 
-    private static void showErrorMessageIfSomeRequiredDependenciesAreNotPresent(boolean isMongodbConnection) {
+    public static void showErrorMessageIfSomeRequiredDependenciesAreNotPresent(boolean isMongodbConnection) {
         if (isMongodbConnection) {
             final String errorMessagePrefix = "The required dependencies (JAR files) are not available on the classpath:";
             String errorMessage = errorMessagePrefix;

src/main/java/liquibase/ext/mongodb/database/MongoLiquibaseDatabase.java

@@ -20,13 +20,10 @@
  * #L%
  */
 
-import com.mongodb.MongoException;
-import com.mongodb.client.MongoClient;
 import com.mongodb.client.MongoDatabase;
 import liquibase.CatalogAndSchema;
 import liquibase.Scope;
 import liquibase.changelog.ChangeLogHistoryServiceFactory;
-import liquibase.database.DatabaseConnection;
 import liquibase.exception.DatabaseException;
 import liquibase.exception.LiquibaseException;
 import liquibase.executor.Executor;
@@ -36,9 +33,6 @@
 import liquibase.nosql.database.AbstractNoSqlDatabase;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
-import org.bson.BsonDocument;
-import org.bson.BsonInt64;
-import org.bson.conversions.Bson;
 
 import static liquibase.nosql.executor.NoSqlExecutor.EXECUTOR_NAME;
 
@@ -127,17 +121,7 @@ public Boolean getSupportsValidator() {
 
     @Override
     public void checkDatabaseConnection() throws DatabaseException {
-        DatabaseConnection connection = getConnection();
-        try {
-            if (connection instanceof MongoConnection) {
-                MongoClient mongoClient = ((MongoConnection) connection).getMongoClient();
-                Bson command = new BsonDocument("ping", new BsonInt64(1));
-                MongoDatabase adminDb = mongoClient.getDatabase(ADMIN_DATABASE_NAME);
-                adminDb.runCommand(command);
-            }
-        } catch (MongoException e) {
-            throw new DatabaseException(e);
-        }
+        MongoConnection.showErrorMessageIfSomeRequiredDependenciesAreNotPresent(true);
+        MongoLiquibaseDatabaseUtil.sendPingSignal(getConnection());
     }
-
 }

src/main/java/liquibase/ext/mongodb/database/MongoLiquibaseDatabaseUtil.java

@@ -0,0 +1,30 @@
+package liquibase.ext.mongodb.database;
+
+import com.mongodb.MongoException;
+import com.mongodb.client.MongoClient;
+import com.mongodb.client.MongoDatabase;
+import liquibase.database.DatabaseConnection;
+import liquibase.exception.DatabaseException;
+import org.bson.BsonDocument;
+import org.bson.BsonInt64;
+import org.bson.conversions.Bson;
+
+import static liquibase.ext.mongodb.database.MongoLiquibaseDatabase.ADMIN_DATABASE_NAME;
+
+public class MongoLiquibaseDatabaseUtil {
+    private MongoLiquibaseDatabaseUtil() {
+    }
+
+    public static void sendPingSignal(DatabaseConnection connection) throws DatabaseException {
+        try {
+            if (connection instanceof MongoConnection) {
+                MongoClient mongoClient = ((MongoConnection) connection).getMongoClient();
+                Bson command = new BsonDocument("ping", new BsonInt64(1));
+                MongoDatabase adminDb = mongoClient.getDatabase(ADMIN_DATABASE_NAME);
+                adminDb.runCommand(command);
+            }
+        } catch (MongoException e) {
+            throw new DatabaseException(e);
+        }
+    }
+}