Bug: Broken view and missing data with Hazelcast

[cdprete]

Spring Boot Admin Server information

• Version: 3.4.5

• Spring Boot version: 3.4.5

• Configured Security: None

• Webflux or Servlet application: WebFlux

Client information

• Spring Boot versions: 3.4.5

• Used discovery mechanism: Eureka

• Webflux or Servlet application: WebFlux

Description

Hi.
I enabled Hazelcast following your documentation and, since then, the UI is completely broken.
Only the health information are displayed and everything else is missing:

My Config bean is as follows:

    // See https://docs.spring-boot-admin.com/3.4.5/docs/server/server#clustering
    @Bean
    @ConditionalOnProperty(prefix = PREFIX, name = "enabled", matchIfMissing = true)
    public Config hazelcastConfig(HazelcastSbaProperties properties) {
        MergePolicyConfig mergePolicyConfig = new MergePolicyConfig();

        Config config = new Config();
        config
                .setClusterName(properties.clusterName())
                .setInstanceName(properties.instanceName())
                .addMapConfig(new MapConfig(properties.sentNotifications()).setInMemoryFormat(OBJECT).setEvictionConfig(new EvictionConfig().setMaxSizePolicy(PER_NODE)).setMergePolicyConfig(mergePolicyConfig))
                .getNetworkConfig()
                    .setPort(properties.port())
                    .getJoin().getMulticastConfig().setEnabled(false);
        config.getJetConfig().setEnabled(true);
        if(properties.dnsName() == null) {
            config.setProperty(SOCKET_BIND_ANY.getName(), FALSE.toString());
            config.getNetworkConfig().getInterfaces().setEnabled(true).addInterface(InetAddress.getLoopbackAddress().getHostAddress());
        } else {
            config.setProperty(HEALTH_MONITORING_LEVEL.getName(), OFF.toString());
            config.getNetworkConfig().getJoin().getKubernetesConfig()
                    .setEnabled(true)
                    .setProperty(SERVICE_DNS.key(), properties.dnsName());
        }

        return config;
    }

and

import static com.hazelcast.config.Config.DEFAULT_CLUSTER_NAME;
import static com.hazelcast.config.NetworkConfig.DEFAULT_PORT;
import static de.codecentric.boot.admin.server.config.AdminServerHazelcastAutoConfiguration.DEFAULT_NAME_EVENT_STORE_MAP;
import static de.codecentric.boot.admin.server.config.AdminServerHazelcastAutoConfiguration.DEFAULT_NAME_SENT_NOTIFICATIONS_MAP;

@Validated
@ConfigurationProperties(HazelcastSbaProperties.PREFIX)
public record HazelcastSbaProperties(
        @Nullable String dnsName,
        @Nullable String instanceName,
        @DefaultValue(ENABLED_DEFAULT_VALUE) boolean enabled,
        @Min(0) @DefaultValue(HAZELCAST_DEFAULT_PORT) int port,
        @NotBlank @DefaultValue(DEFAULT_CLUSTER_NAME) String clusterName,
        @NotBlank @DefaultValue(DEFAULT_NAME_EVENT_STORE_MAP) String eventStore,
        @NotBlank @DefaultValue(DEFAULT_NAME_SENT_NOTIFICATIONS_MAP) String sentNotifications
) {
    private static final String ENABLED_DEFAULT_VALUE = "true";
    private static final String HAZELCAST_DEFAULT_PORT = "" + DEFAULT_PORT;

    static final String PREFIX = "spring.boot.admin.hazelcast";
}

where dnsName is set to name of an headless service in OpenShift.
For that, I was following https://docs.hazelcast.com/hazelcast/5.5/kubernetes/kubernetes-auto-discovery#using-kubernetes-in-dns-lookup-mode

Can you please help?

Kind regards and thanks.

[cdprete]

Even worse, the instance stays registered even if it gets recognized that it doesn't exist anymore:

2025-05-08T11:26:32.159Z INFO 1 --- [Zookeepers Monitoring] [reshExecutor-%d] d.c.b.a.s.c.d.InstanceDiscoveryListener : Instance '8304914b0079' missing in DiscoveryClient services and will be removed.
2025-05-08T11:26:47.161Z INFO 1 --- [Zookeepers Monitoring] [reshExecutor-%d] d.c.b.a.s.c.d.InstanceDiscoveryListener : Instance '8304914b0079' missing in DiscoveryClient services and will be removed.
2025-05-08T11:28:26.002Z INFO 1 --- [Zookeepers Monitoring] [or-http-epoll-3] d.c.b.a.s.c.d.InstanceDiscoveryListener : Instance '8304914b0079' missing in DiscoveryClient services and will be removed.

[cdprete]

Nevermind.
It seems like I was missing the eventStore map and this was causing the issue.

It would be nice if it would have been reported in the logs with a nice error, though. :D