MongoDb Srv connection does not work on windows

[Liuigi]

Describe the bug

For the windows project, when you run the application with the maven commande
mvn compile quarkus:dev -Dquarkus.profile=local

The application failed to open a mongo connection with the SRV protocol.
"/etc/resolv.conf"

Expected behavior

The mongodb SRV protocol should work out of the box

Actual behavior

we have a great stack trace with NPE :

2022-10-14 18:17:06,767 ERROR [org.jbo.res.rea.com.cor.AbstractResteasyReactiveContext] (executor-thread-0) Request failed: java.lang.NullPointerException: Cannot invoke "java.util.List.isEmpty()" because "list" is null
	at io.quarkus.mongodb.runtime.dns.MongoDnsClient.lambda$new$0(MongoDnsClient.java:58)
	at java.base/java.util.Optional.orElseGet(Optional.java:364)
	at io.quarkus.mongodb.runtime.dns.MongoDnsClient.<init>(MongoDnsClient.java:56)
	at io.quarkus.mongodb.runtime.dns.MongoDnsClientProvider.create(MongoDnsClientProvider.java:12)
	at com.mongodb.internal.dns.DefaultDnsResolver.<init>(DefaultDnsResolver.java:44)
	at com.mongodb.ConnectionString.<init>(ConnectionString.java:397)
	at io.quarkus.mongodb.runtime.MongoClients.createMongoConfiguration(MongoClients.java:262)
	at io.quarkus.mongodb.runtime.MongoClients.createMongoClient(MongoClients.java:118)
	at io.quarkus.mongodb.runtime.MongoClients_Subclass.createMongoClient$$superforward1(Unknown Source)
	at io.quarkus.mongodb.runtime.MongoClients_Subclass$$function$$4.apply(Unknown Source)
	at io.quarkus.arc.impl.AroundInvokeInvocationContext.proceed(AroundInvokeInvocationContext.java:53)
	at io.quarkus.arc.runtime.devconsole.InvocationInterceptor.proceed(InvocationInterceptor.java:62)
	at io.quarkus.arc.runtime.devconsole.InvocationInterceptor.monitor(InvocationInterceptor.java:49)
	at io.quarkus.arc.runtime.devconsole.InvocationInterceptor_Bean.intercept(Unknown Source)
	at io.quarkus.arc.impl.InterceptorInvocation.invoke(InterceptorInvocation.java:41)
	at io.quarkus.arc.impl.AroundInvokeInvocationContext.perform(AroundInvokeInvocationContext.java:40)
	at io.quarkus.arc.impl.InvocationContexts.performAroundInvoke(InvocationContexts.java:32)
	at io.quarkus.mongodb.runtime.MongoClients_Subclass.createMongoClient(Unknown Source)
	at io.quarkus.mongodb.runtime.MongoClientRecorder.lambda$mongoClientSupplier$0(MongoClientRecorder.java:63)
	at io.quarkus.mongodb.runtime.MongoClientRecorder$MongoClientSupplier.get(MongoClientRecorder.java:57)
	at com.mongodb.client.MongoClient_38bcba43bbcf7928744e8baa654420f551f1ff9a_Synthetic_Bean.create(Unknown Source)
	at com.mongodb.client.MongoClient_38bcba43bbcf7928744e8baa654420f551f1ff9a_Synthetic_Bean.create(Unknown Source)
	at io.quarkus.arc.impl.AbstractSharedContext.createInstanceHandle(AbstractSharedContext.java:111)
	at io.quarkus.arc.impl.AbstractSharedContext$1.get(AbstractSharedContext.java:35)
	at io.quarkus.arc.impl.AbstractSharedContext$1.get(AbstractSharedContext.java:32)
	at io.quarkus.arc.impl.LazyValue.get(LazyValue.java:26)
	at io.quarkus.arc.impl.ComputingCache.computeIfAbsent(ComputingCache.java:69)
	at io.quarkus.arc.impl.AbstractSharedContext.get(AbstractSharedContext.java:32)
	at io.quarkus.arc.impl.ClientProxies.getApplicationScopedDelegate(ClientProxies.java:19)
	at com.mongodb.client.MongoClient_38bcba43bbcf7928744e8baa654420f551f1ff9a_Synthetic_ClientProxy.arc$delegate(Unknown Source)
	at com.mongodb.client.MongoClient_38bcba43bbcf7928744e8baa654420f551f1ff9a_Synthetic_ClientProxy.getDatabase(Unknown Source)

How to Reproduce?

Step to reproduce the behaviour :

1. Having a windows environment or not having the right to read this file ( "/etc/resolv.conf")
2. try to connect a mongodb with srv protocole ( url connection must start with mongodb+srv)
3. try to open the connection, the NPE rise !

Output of uname -a or ver

No response

Output of java -version

Java version: 17.0.1

GraalVM version (if different from Java)

No response

Quarkus version or git rev

2.12.0

Build tool (ie. output of mvnw --version or gradlew --version)

Apache Maven 3.8.1

Additional information

You should not initialize a list with null

List nameServers = null;

should be nameServers = new ArrayList<>();

[quarkus-bot]

/cc @evanchooly, @loicmathieu

[nicoDs96]

Hi, I had the same issue today, a workaround is using legacy connection string specifing shards, like mongodb://<usr>:<psw>@<cluster_id>.mongodb.net:27017,<cluster_id>-shard-00-01.ysvl5.mongodb.net:27017,<cluster_id>-shard-00-02.ysvl5.mongodb.net:27017/?ssl=true&replicaSet=atlas-j022j2-shard-0&authSource=admin&retryWrites=true&w=majority.

My application.properties:

# configure the MongoDB client for a replica set of two nodes
quarkus.mongodb.connection-string=mongodb://<usr>:<psw>@<cluster_id>.mongodb.net:27017,<cluster_id>-shard-00-01.ysvl5.mongodb.net:27017,<cluster_id>-shard-00-02.ysvl5.mongodb.net:27017/?ssl=true&replicaSet=atlas-j022j2-shard-0&authSource=admin&retryWrites=true&w=majority
# mandatory if you don't specify the name of the database using @MongoEntity
quarkus.mongodb.database = Feeds

[geoand]

Can you try with Quarkus 2.13.2.Final please?

If the problem still persists, please attach a sample project that exhibits the problematic behavior.

[Liuigi]

@nicoDs96 juste create an empty file "/etc/resolv.conf" and it will work ;)
@geoand i accept your review, it will nice if the fix is deployed soon

[geoand]

That should likely happen with 2.13.3.Final, likely within the next 7 to 10 days