Desenvolvimento sem servidor com AWS Lambda e MongoDB Atlas usando Java

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package example;
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import com.amazonaws.services.lambda.runtime.Context;
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import com.amazonaws.services.lambda.runtime.RequestHandler;
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public class Handler implements RequestHandler<Map<String,String>, Void>{
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    @Override
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    public void handleRequest(Map<String,String> event, Context context) {
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        // Code will be in here...
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        return null;
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    }
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}

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plugins {
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    id 'java'
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}
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group = 'org.example'
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version = '1.0-SNAPSHOT'
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repositories {
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    mavenCentral()
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}
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dependencies {
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    testImplementation platform('org.junit:junit-bom:5.9.1')
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    testImplementation 'org.junit.jupiter:junit-jupiter'
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    implementation 'com.amazonaws:aws-lambda-java-core:1.2.2'
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    implementation 'com.amazonaws:aws-lambda-java-events:3.11.1'
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    implementation 'org.slf4j:slf4j-log4j12:1.7.36'
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    runtimeOnly 'com.amazonaws:aws-lambda-java-log4j2:1.5.1'
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}
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test {
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    useJUnitPlatform()
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}
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task buildZip(type: Zip) {
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    into('lib') {
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        from(jar)
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        from(configurations.runtimeClasspath)
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    }
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}
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build.dependsOn buildZip

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dependencies {
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    // Previous boilerplate dependencies ...
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    implementation 'org.mongodb:bson:4.10.2'
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    implementation 'org.mongodb:mongodb-driver-sync:4.10.2'
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}

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package example;
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import com.amazonaws.services.lambda.runtime.Context;
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import com.amazonaws.services.lambda.runtime.RequestHandler;
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import com.mongodb.client.MongoClient;
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import com.mongodb.client.MongoClients;
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import com.mongodb.client.MongoCollection;
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import com.mongodb.client.MongoDatabase;
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import com.mongodb.client.model.Filters;
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import org.bson.BsonDocument;
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import org.bson.Document;
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import org.bson.conversions.Bson;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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public class Handler implements RequestHandler<Map<String,String>, Void>{
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    private final MongoClient mongoClient;
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    public Handler() {
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        mongoClient = MongoClients.create(System.getenv("MONGODB_ATLAS_URI"));
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    }
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    @Override
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    public void handleRequest(Map<String,String> event, Context context) {
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        MongoDatabase database = mongoClient.getDatabase("sample_mflix");
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        MongoCollection<Document> collection = database.getCollection("movies");
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        // More logic here ...
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        return null;
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    }
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}

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public Handler() {
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    mongoClient = MongoClients.create(System.getenv("MONGODB_ATLAS_URI"));
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}

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@Override
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public void handleRequest(Map<String,String> event, Context context) {
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    MongoDatabase database = mongoClient.getDatabase("sample_mflix");
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    MongoCollection<Document> collection = database.getCollection("movies");
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    // More logic here ...
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    return null;
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}

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public class Handler implements RequestHandler<Map<String,String>, List<Document>>{
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    private final MongoClient mongoClient;
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    public Handler() {
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        mongoClient = MongoClients.create(System.getenv("MONGODB_ATLAS_URI"));
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    }
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    @Override
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    public List<Document> handleRequest(Map<String,String> event, Context context) {
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        MongoDatabase database = mongoClient.getDatabase("sample_mflix");
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        MongoCollection<Document> collection = database.getCollection("movies");
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        // More logic here ...
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        return null;
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    }
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}

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@Override
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public List<Document> handleRequest(Map<String,String> event, Context context) {
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    MongoDatabase database = mongoClient.getDatabase("sample_mflix");
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    MongoCollection<Document> collection = database.getCollection("movies");
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    Bson filter = new BsonDocument();
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    if(event.containsKey("title") && !event.get("title").isEmpty()) {
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        filter = Filters.eq("title", event.get("title"));
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    }
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    List<Document> results = new ArrayList<>();
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    collection.find(filter).limit(5).into(results);
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    return results;
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}

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./gradlew build

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mongodb+srv://<username>:<password>@examples.170lwj0.mongodb.net/?retryWrites=true&w=majority

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{
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    "title": "Batman"
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}