From 8abdbab764e9eefae393a32847ec0d5a8210128f Mon Sep 17 00:00:00 2001
From: Vitalii Makarchenkov <mail@vitaliimak.com>
Date: Fri, 1 Mar 2024 16:04:53 +0200
Subject: [PATCH 1/3] Add user friendly message if required dependencies are
 not available

---
 .../ext/mongodb/database/MongoConnection.java | 34 ++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java b/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java
index 2ea652b2..42fe3195 100644
--- a/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java
+++ b/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java
@@ -27,6 +27,7 @@
 import liquibase.GlobalConfiguration;
 import liquibase.Scope;
 import liquibase.exception.DatabaseException;
+import liquibase.exception.UnexpectedLiquibaseException;
 import liquibase.ext.mongodb.configuration.MongoConfiguration;
 import liquibase.ext.mongodb.statement.BsonUtils;
 import liquibase.logging.Logger;
@@ -68,7 +69,38 @@ public boolean supports(String url) {
         if (url == null) {
             return false;
         }
-        return url.toLowerCase().startsWith("mongodb");
+
+        boolean isMongodbConnection = url.toLowerCase().startsWith("mongodb");
+
+        if (isMongodbConnection) {
+            final String errorMessagePrefix = "The required dependencies JAR files are not available on the classpath:";
+            String errorMessage = errorMessagePrefix;
+
+            try {
+                Class.forName("com.mongodb.ConnectionString");
+            } catch (ClassNotFoundException e) {
+                errorMessage += "\n- mongodb-driver-core.jar";
+            }
+
+            try {
+                Class.forName("com.mongodb.client.MongoClients");
+            } catch (ClassNotFoundException e) {
+                errorMessage += "\n- mongodb-driver-sync.jar";
+            }
+
+            try {
+                Class.forName("org.bson.Transformer");
+            } catch (ClassNotFoundException e) {
+                errorMessage += "\n- bson.jar";
+            }
+
+            if (!errorMessage.equals(errorMessagePrefix)) {
+                errorMessage += "\nDownload the required dependencies and place them in the 'liquibase/lib' folder";
+                throw new UnexpectedLiquibaseException(errorMessage);
+            }
+        }
+
+        return isMongodbConnection;
     }
 
     @Override

From 2b0c0ac8a77b53398f5ec09f974b9eaaeb1c6ec7 Mon Sep 17 00:00:00 2001
From: Vitalii Makarchenkov <mail@vitaliimak.com>
Date: Fri, 1 Mar 2024 16:37:42 +0200
Subject: [PATCH 2/3] Fix error message

---
 .../java/liquibase/ext/mongodb/database/MongoConnection.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java b/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java
index 42fe3195..53f7d472 100644
--- a/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java
+++ b/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java
@@ -73,7 +73,7 @@ public boolean supports(String url) {
         boolean isMongodbConnection = url.toLowerCase().startsWith("mongodb");
 
         if (isMongodbConnection) {
-            final String errorMessagePrefix = "The required dependencies JAR files are not available on the classpath:";
+            final String errorMessagePrefix = "The required dependencies (JAR files) are not available on the classpath:";
             String errorMessage = errorMessagePrefix;
 
             try {

From a8606446171ef01a81ff14732f304494a0d04ae3 Mon Sep 17 00:00:00 2001
From: Vitalii Makarchenkov <mail@vitaliimak.com>
Date: Mon, 18 Mar 2024 12:56:10 +0200
Subject: [PATCH 3/3] Fix code

---
 .../ext/mongodb/database/MongoConnection.java          | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java b/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java
index 53f7d472..a3559ae2 100644
--- a/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java
+++ b/src/main/java/liquibase/ext/mongodb/database/MongoConnection.java
@@ -70,8 +70,14 @@ public boolean supports(String url) {
             return false;
         }
 
-        boolean isMongodbConnection = url.toLowerCase().startsWith("mongodb");
+         boolean isMongodbConnection = url.toLowerCase().startsWith("mongodb");
 
+        showErrorMessageIfSomeRequiredDependenciesAreNotPresent(isMongodbConnection);
+
+        return isMongodbConnection;
+    }
+
+    private static void showErrorMessageIfSomeRequiredDependenciesAreNotPresent(boolean isMongodbConnection) {
         if (isMongodbConnection) {
             final String errorMessagePrefix = "The required dependencies (JAR files) are not available on the classpath:";
             String errorMessage = errorMessagePrefix;
@@ -99,8 +105,6 @@ public boolean supports(String url) {
                 throw new UnexpectedLiquibaseException(errorMessage);
             }
         }
-
-        return isMongodbConnection;
     }
 
     @Override