How to configure Hazelcast host port in Spring Boot? - spring

Question

I'm using hazelcast in my project and want to move hazelcast host:port information into environment variables. Before that I had default configuration that is:
<hazelcast-client xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.hazelcast.com/schema/client-config
http://www.hazelcast.com/schema/client-config/hazelcast-client-config-3.8.xsd"
xmlns="http://www.hazelcast.com/schema/client-config">
<network>
<connection-timeout>3000</connection-timeout>
<connection-attempt-period>1000</connection-attempt-period>
<connection-attempt-limit>259200</connection-attempt-limit>
</network>
</hazelcast-client>
and I've found that there is possibility to add <cluster-members> tag inside <network> to provide custom <address> for hazelcast instances. I've modified my hazelcast.xml file into:
<network>
<cluster-members>
<address>${HAZELCAST_URL}</address>
</cluster-members>
...
But whenever I'm starting my app it shows:
2017-11-10 17:55:45 [service,,,] WARN c.h.c.s.i.ClusterListenerSupport hz.client_0 [dev] [3.8.5] Exception during initial connection to ${HAZELCAST_URL}:5701, exception java.lang.IllegalArgumentException: Can't resolve address: ${HAZELCAST_URL}:5701
2017-11-10 17:55:45 [service,,,] WARN c.h.c.s.i.ClusterListenerSupport hz.client_0 [dev] [3.8.5] Exception during initial connection to ${HAZELCAST_URL}:5702, exception java.lang.IllegalArgumentException: Can't resolve address: ${HAZELCAST_URL}:5702
It means it still tries to connect to default port and variable is not resolved. Is there a way to configure it?

Answer 1

You can pass java.util.Properties into the client config builder. All you need do is build it from Spring's environment.
#Bean
public ClientConfig clientConfig(Environment environment) throws Exception {
Properties properties = new Properties();
String HAZELCAST_URL = "HAZELCAST_URL";
properties.put(HAZELCAST_URL, environment.getProperty(HAZELCAST_URL));
XmlClientConfigBuilder xmlClientConfigBuilder = new XmlClientConfigBuilder("hazelcast-client.xml");
xmlClientConfigBuilder.setProperties(properties);
return xmlClientConfigBuilder.build();
}
#Bean
public HazelcastInstance hazelcastInstance(ClientConfig clientConfig) {
return HazelcastClient.newHazelcastClient(clientConfig);
}
Note, there are more elegant ways to do this, the above is just one solution keeping it as simple as possible