* Add .gitignore

* Add Logback dependency
* Increment Java language version to 11
* Add code showing how to configure log levels
* Code patches

Author: sindbach

.gitignore

@@ -21,3 +21,7 @@
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
+
+java/dependency-reduced-pom.xml
+java/target/
+.m2/

java/pom.xml

@@ -7,14 +7,13 @@
   <dependencies>
     <dependency>
       <groupId>org.mongodb</groupId>
-      <artifactId>mongodb-driver-sync</artifactId><version>x.x.x</version>
+      <artifactId>mongodb-driver-sync</artifactId><version>4.3.0</version>
+    </dependency>
+    <dependency>
+      <groupId>ch.qos.logback</groupId>
+        <artifactId>logback-classic</artifactId>
+      <version>1.2.11</version>
     </dependency>
-  <dependency>
-    <groupId>org.slf4j</groupId>
-    <artifactId>slf4j-simple</artifactId>
-    <version>1.7.31</version>
-    <scope>compile</scope>
-  </dependency>
   </dependencies>
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -26,8 +25,8 @@
         <artifactId>maven-compiler-plugin</artifactId>
         <version>3.7.0</version>
         <configuration>
-          <source>1.8</source>
-          <target>1.8</target>
+          <source>11</source>
+          <target>11</target>
         </configuration>
       </plugin>
       <plugin>

java/src/main/java/com/start/Getstarted.java

@@ -1,8 +1,11 @@
 package com.start;
 
-import com.mongodb.Block;
-import com.mongodb.client.MongoClients;
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
+
+import com.mongodb.client.AggregateIterable;
 import com.mongodb.client.MongoClient;
+import com.mongodb.client.MongoClients;
 import com.mongodb.client.MongoCollection;
 import com.mongodb.client.MongoCursor;
 import com.mongodb.client.MongoDatabase;
@@ -17,6 +20,7 @@
 import com.mongodb.client.result.DeleteResult;
 
 import org.bson.Document;
+import org.slf4j.LoggerFactory;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -28,8 +32,17 @@
 import static com.mongodb.client.model.Projections.excludeId;
 import static com.mongodb.client.model.Sorts.descending;
 
+@SuppressWarnings("ConstantConditions")
 public class Getstarted {
     public static void main(final String[] args) {
+        
+        // See https://www.mongodb.com/docs/drivers/java/sync/current/fundamentals/logging/#logger-names
+        // for available logger names that can be individually configured, in addition to this default
+        // that covers all of them (logger names are hierarchical and inherit from their ancestor loggers)
+        Logger root = (Logger) LoggerFactory.getLogger("org.mongodb.driver");
+        // Available levels are: OFF, ERROR, WARN, INFO, DEBUG, TRACE, ALL
+        root.setLevel(Level.WARN);
+
         String mongoURI = System.getenv("MONGODB_URI");
 
         MongoClient mongoClient = MongoClients.create(mongoURI);
@@ -53,7 +66,7 @@ public static void main(final String[] args) {
         System.out.println("\t" + myDoc.toJson());
 
         // insert many
-        List<Document> documents = new ArrayList<Document>();
+        List<Document> documents = new ArrayList<>();
         for (int i = 0; i < 5; i++) {
             documents.add(new Document("i", i));
         }
@@ -62,13 +75,11 @@ public static void main(final String[] args) {
         System.out.println("\tTotal # of documents: " + collection.countDocuments());
 
         // lets get all the documents in the collection and print them out
-        MongoCursor<Document> cursor = collection.find().iterator();
-        try {
+        try (MongoCursor<Document> cursor = collection.find().iterator())
+        {
             while (cursor.hasNext()) {
                 System.out.println(cursor.next().toJson());
             }
-        } finally {
-            cursor.close();
         }
 
         // now use a query to get 1 document out
@@ -99,15 +110,10 @@ public static void main(final String[] args) {
         // Aggregation
         Document group = Document.parse("{$group:{_id: null, total :{$sum:'$i'}}}"); 
         List<Document> pipeline = asList(group);
-        
-        Consumer<Document> printBlock = new Consumer<Document>() {
-            public void accept(final Document doc) {
-                System.out.println(doc.toJson());
-            };
-        };     
+  
         AggregateIterable<Document> iterable = collection.aggregate(pipeline);
         System.out.println("Aggregation Result:");
-        iterable.forEach(printBlock); 
+        iterable.forEach(documentX -> System.out.println(documentX.toJson())); 
 
         // release resources
         mongoClient.close();