Cannot use 3rd party library which requires Guava 31.1 version due to incompatibility with Corda's Guava 28.0 #7493
Description
I want to add integration with Google PubSub 1.124.2 in Corda 4
compile("com.google.cloud:google-cloud-pubsub:1.124.2")
Simply I have a @CordaService which has a method to publish something to Google PubSub. It builds fine but in runtime I get this error:
Caused by: java.lang.NoSuchMethodError: com.google.common.collect.ImmutableMap$Builder.buildKeepingLast()Lcom/google/common/collect/ImmutableMap;
I found that PubSub library has a dependency
com.google.guava:guava:31.1-jre
where ImmutableMap.buildKeepingLast method was added.
In runtime I checked that ImmutableMap was loaded from here:
(file:/home/xxx/.capsule/apps/net.corda.node.CordaEnterprise_4.6.1/guava-28.0-jre.jar )
Why is that? Why Corda dependency was used instead of workflows dependency?
Code to reproduce:
workflows build gradle
compile("com.google.cloud:google-cloud-pubsub:1.124.2")
compile("com.google.guava:guava:31.1-jre")
Corda Service:
import com.google.api.core.ApiFuture
import com.google.cloud.pubsub.v1.Publisher
import com.google.protobuf.ByteString
import com.google.pubsub.v1.PubsubMessage
import com.google.pubsub.v1.TopicName
import net.corda.core.node.AppServiceHub
import net.corda.core.node.services.CordaService
import net.corda.core.serialization.SingletonSerializeAsToken
import net.corda.core.utilities.loggerFor
import java.util.concurrent.TimeUnit
@CordaService
class EventBusPublisher(private val serviceHub: AppServiceHub) : SingletonSerializeAsToken() {
companion object {
val logger = loggerFor<EventBusPublisher>()
}
fun publish(message: String) {
logger.info("Publishing message to event bus: $message")
val topicName = TopicName.of("fragmos", "corda.event.state-change")
var publisher: Publisher? = null
try {
// Create a publisher instance with default settings bound to the topic
publisher = Publisher.newBuilder(topicName).build()
val data: ByteString = ByteString.copyFromUtf8(message)
val pubsubMessage: PubsubMessage = PubsubMessage.newBuilder().setData(data).build()
// Once published, returns a server-assigned message id (unique within the topic)
val messageIdFuture: ApiFuture<String> = publisher.publish(pubsubMessage)
val messageId: String = messageIdFuture.get()
logger.info("Published message ID: $messageId")
} finally {
if (publisher != null) {
// When finished with the publisher, shutdown to free up resources.
publisher.shutdown()
publisher.awaitTermination(1, TimeUnit.MINUTES)
}
}
}
}