NATS Unable to to Connect

[jordanperrin]

Describe the bug
I am running a NATS-streaming docker container and I am trying to get IBM FHIR docker to connect to it. In my config file I have the following:
NOTE: "test-cluster" is the correct and default clusterID for NATS-streaming , TLS is disabled on the NATS container, anf both containers are bridged on the same network.

"nats": {
                "enabled": true,
                "cluster": "test-cluster",
                "channel": "fhirNotifications",
                "clientId": "ibm-fhir",
                "servers": "nats://0.0.0.0:4222",
                "useTLS": false,
                "truststoreLocation": "resources/security/nats.client.truststore.jks",
                "truststorePassword": "change-password",
                "keystoreLocation": "resources/security/nats.client.keystore.jks",
                "keystorePassword": "change-password"
            }

The error stack trace from the IBM FHIR Server:

[8/2/23, 13:59:08:062 UTC] 00000036 FHIRNotificat E   Caught exception while initializing NATS publisher.
         java.io.IOException: Unable to connect to NATS servers: nats://0.0.0.0:4222
        at io.nats.client.impl.NatsConnection.connect(NatsConnection.java:207)
        at io.nats.client.impl.NatsImpl.createConnection(NatsImpl.java:29)
        at io.nats.client.Nats.createConnection(Nats.java:276)
        at io.nats.client.Nats.connect(Nats.java:193)
        at com.ibm.fhir.server.notifications.nats.FHIRNotificationNATSPublisher.init(FHIRNotificationNATSPublisher.java:103)
        at com.ibm.fhir.server.notifications.nats.FHIRNotificationNATSPublisher.<init>(FHIRNotificationNATSPublisher.java:54)
        at com.ibm.fhir.server.listener.FHIRServletContextListener.contextInitialized(FHIRServletContextListener.java:213)
        at com.ibm.ws.webcontainer.webapp.WebApp.notifyServletContextCreated(WebApp.java:2447)
        at com.ibm.ws.webcontainer31.osgi.webapp.WebApp31.notifyServletContextCreated(WebApp31.java:517)
        at com.ibm.ws.webcontainer.webapp.WebApp.initialize(WebApp.java:1045)
        at com.ibm.ws.webcontainer.webapp.WebApp.initialize(WebApp.java:6685)
        at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost.startWebApp(DynamicVirtualHost.java:472)
        at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost.startWebApplication(DynamicVirtualHost.java:467)
        at com.ibm.ws.webcontainer.osgi.WebContainer.startWebApplication(WebContainer.java:1188)
        at com.ibm.ws.webcontainer.osgi.WebContainer.startModule(WebContainer.java:977)
        at com.ibm.ws.app.manager.module.internal.ModuleHandlerBase.deployModule(ModuleHandlerBase.java:99)
        at com.ibm.ws.app.manager.module.internal.DeployedModuleInfoImpl.installModule(DeployedModuleInfoImpl.java:49)
        at com.ibm.ws.app.manager.module.internal.SimpleDeployedAppInfoBase.deployModules(SimpleDeployedAppInfoBase.java:597)
        at com.ibm.ws.app.manager.module.internal.SimpleDeployedAppInfoBase.installApp(SimpleDeployedAppInfoBase.java:511)
        at com.ibm.ws.app.manager.module.internal.DeployedAppInfoBase.deployApp(DeployedAppInfoBase.java:349)
        at com.ibm.ws.app.manager.war.internal.WARApplicationHandlerImpl.install(WARApplicationHandlerImpl.java:65)
        at com.ibm.ws.app.manager.internal.statemachine.StartAction.execute(StartAction.java:161)
        at com.ibm.ws.app.manager.internal.statemachine.ApplicationStateMachineImpl.enterState(ApplicationStateMachineImpl.java:1357)
        at com.ibm.ws.app.manager.internal.statemachine.ApplicationStateMachineImpl.run(ApplicationStateMachineImpl.java:901)
        at com.ibm.ws.threading.internal.ExecutorServiceImpl$RunnableWrapper.run(ExecutorServiceImpl.java:245)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:866)
[8/2/23, 13:59:08:066 UTC] 00000036 FHIRServletCo E   Encountered an exception while initializing the servlet context.
                                 java.lang.IllegalStateException: Caught exception while initializing NATS publisher.
        at com.ibm.fhir.server.notifications.nats.FHIRNotificationNATSPublisher.init(FHIRNotificationNATSPublisher.java:125)
        at com.ibm.fhir.server.notifications.nats.FHIRNotificationNATSPublisher.<init>(FHIRNotificationNATSPublisher.java:54)
        at com.ibm.fhir.server.listener.FHIRServletContextListener.contextInitialized(FHIRServletContextListener.java:213)
        at com.ibm.ws.webcontainer.webapp.WebApp.notifyServletContextCreated(WebApp.java:2447)
        at com.ibm.ws.webcontainer31.osgi.webapp.WebApp31.notifyServletContextCreated(WebApp31.java:517)
        at com.ibm.ws.webcontainer.webapp.WebApp.initialize(WebApp.java:1045)
        at com.ibm.ws.webcontainer.webapp.WebApp.initialize(WebApp.java:6685)
        at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost.startWebApp(DynamicVirtualHost.java:472)
        at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost.startWebApplication(DynamicVirtualHost.java:467)
        at com.ibm.ws.webcontainer.osgi.WebContainer.startWebApplication(WebContainer.java:1188)
        at com.ibm.ws.webcontainer.osgi.WebContainer.startModule(WebContainer.java:977)
        at com.ibm.ws.app.manager.module.internal.ModuleHandlerBase.deployModule(ModuleHandlerBase.java:99)
        at com.ibm.ws.app.manager.module.internal.DeployedModuleInfoImpl.installModule(DeployedModuleInfoImpl.java:49)
        at com.ibm.ws.app.manager.module.internal.SimpleDeployedAppInfoBase.deployModules(SimpleDeployedAppInfoBase.java:597)
        at com.ibm.ws.app.manager.module.internal.SimpleDeployedAppInfoBase.installApp(SimpleDeployedAppInfoBase.java:511)
        at com.ibm.ws.app.manager.module.internal.DeployedAppInfoBase.deployApp(DeployedAppInfoBase.java:349)
        at com.ibm.ws.app.manager.war.internal.WARApplicationHandlerImpl.install(WARApplicationHandlerImpl.java:65)
        at com.ibm.ws.app.manager.internal.statemachine.StartAction.execute(StartAction.java:161)
        at com.ibm.ws.app.manager.internal.statemachine.ApplicationStateMachineImpl.enterState(ApplicationStateMachineImpl.java:1357)
        at com.ibm.ws.app.manager.internal.statemachine.ApplicationStateMachineImpl.run(ApplicationStateMachineImpl.java:901)
        at com.ibm.ws.threading.internal.ExecutorServiceImpl$RunnableWrapper.run(ExecutorServiceImpl.java:245)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:866)
Caused by: java.io.IOException: Unable to connect to NATS servers: nats://0.0.0.0:4222
        at io.nats.client.impl.NatsConnection.connect(NatsConnection.java:207)
        at io.nats.client.impl.NatsImpl.createConnection(NatsImpl.java:29)
        at io.nats.client.Nats.createConnection(Nats.java:276)
        at io.nats.client.Nats.connect(Nats.java:193)
        at com.ibm.fhir.server.notifications.nats.FHIRNotificationNATSPublisher.init(FHIRNotificationNATSPublisher.java:103)
        ... 23 more
[8/2/23, 13:59:08:185 UTC] 00000036 IncidentImpl  I   FFDC1015I: An FFDC Incident has been created: "java.lang.RuntimeException: Encountered an exception while initializing the servlet context. com.ibm.ws.webcontainer.webapp.WebApp.notifyServletContextCreated 1341" at ffdc_23.08.02_13.59.08.0.log
[8/2/23, 13:59:08:187 UTC] 00000036 webapp        E com.ibm.ws.webcontainer.webapp.WebApp notifyServletContextCreated SRVE0283E: Exception caught while initializing context: java.lang.RuntimeException: Encountered an exception while initializing the servlet context.
        at com.ibm.fhir.server.listener.FHIRServletContextListener.contextInitialized(FHIRServletContextListener.java:249)
        at com.ibm.ws.webcontainer.webapp.WebApp.notifyServletContextCreated(WebApp.java:2447)
        at com.ibm.ws.webcontainer31.osgi.webapp.WebApp31.notifyServletContextCreated(WebApp31.java:517)
        at com.ibm.ws.webcontainer.webapp.WebApp.initialize(WebApp.java:1045)
        at com.ibm.ws.webcontainer.webapp.WebApp.initialize(WebApp.java:6685)
        at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost.startWebApp(DynamicVirtualHost.java:472)
        at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost.startWebApplication(DynamicVirtualHost.java:467)
        at com.ibm.ws.webcontainer.osgi.WebContainer.startWebApplication(WebContainer.java:1188)
        at com.ibm.ws.webcontainer.osgi.WebContainer.startModule(WebContainer.java:977)
        at com.ibm.ws.app.manager.module.internal.ModuleHandlerBase.deployModule(ModuleHandlerBase.java:99)
        at com.ibm.ws.app.manager.module.internal.DeployedModuleInfoImpl.installModule(DeployedModuleInfoImpl.java:49)
        at com.ibm.ws.app.manager.module.internal.SimpleDeployedAppInfoBase.deployModules(SimpleDeployedAppInfoBase.java:597)
        at com.ibm.ws.app.manager.module.internal.SimpleDeployedAppInfoBase.installApp(SimpleDeployedAppInfoBase.java:511)
        at com.ibm.ws.app.manager.module.internal.DeployedAppInfoBase.deployApp(DeployedAppInfoBase.java:349)
        at com.ibm.ws.app.manager.war.internal.WARApplicationHandlerImpl.install(WARApplicationHandlerImpl.java:65)
        at com.ibm.ws.app.manager.internal.statemachine.StartAction.execute(StartAction.java:161)
        at com.ibm.ws.app.manager.internal.statemachine.ApplicationStateMachineImpl.enterState(ApplicationStateMachineImpl.java:1357)
        at com.ibm.ws.app.manager.internal.statemachine.ApplicationStateMachineImpl.run(ApplicationStateMachineImpl.java:901)
        at com.ibm.ws.threading.internal.ExecutorServiceImpl$RunnableWrapper.run(ExecutorServiceImpl.java:245)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:866)
Caused by: java.lang.IllegalStateException: Caught exception while initializing NATS publisher.
        at com.ibm.fhir.server.notifications.nats.FHIRNotificationNATSPublisher.init(FHIRNotificationNATSPublisher.java:125)
        at com.ibm.fhir.server.notifications.nats.FHIRNotificationNATSPublisher.<init>(FHIRNotificationNATSPublisher.java:54)
        at com.ibm.fhir.server.listener.FHIRServletContextListener.contextInitialized(FHIRServletContextListener.java:213)
        ... 21 more
Caused by: java.io.IOException: Unable to connect to NATS servers: nats://0.0.0.0:4222
        at io.nats.client.impl.NatsConnection.connect(NatsConnection.java:207)
        at io.nats.client.impl.NatsImpl.createConnection(NatsImpl.java:29)
        at io.nats.client.Nats.createConnection(Nats.java:276)
        at io.nats.client.Nats.connect(Nats.java:193)
        at com.ibm.fhir.server.notifications.nats.FHIRNotificationNATSPublisher.init(FHIRNotificationNATSPublisher.java:103)
        ... 23 more

I created my own java application and replicated the code from FHIRNotificationNATSPublisher and the code works successfully on my java app. The code that I have running successfully:

String servers = "nats://0.0.0.0:4222";
io.nats.client.Options.Builder builder = new io.nats.client.Options.Builder();	
builder.maxReconnects(-1);
builder.connectionName("fhirNotifications");
builder.servers(servers.split(","));
io.nats.client.Options natsOptions = builder.build();
Connection nc = Nats.connect(natsOptions);      
Options streamingOptions = new Options.Builder().natsConn(nc).build();      
StreamingConnection sc = NatsStreaming.connect("test-cluster", "JAVA-APP-TEST", streamingOptions);

Environment
Which version of LinuxForHealth FHIR Server?
Latest Docker Image

To Reproduce
Steps to reproduce the behavior:

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4. See error