Using Variables
In your Hazelcast and/or Hazelcast Client declarative configuration, you can use variables to set the values of the elements. This is valid when you set a system property programmatically or you use the command line interface. You can use a variable in the declarative configuration to access the values of the system properties you set.
For example, see the following command that sets two system properties.
-Dcluster.name=devLet’s get the values of these system properties in the declarative configuration (XML/YAML) of Hazelcast, as shown below.
<hazelcast>
<cluster-name>${cluster.name}</cluster-name>
</hazelcast>hazelcast:
cluster-name: ${cluster.name}This also applies to the declarative configuration of Hazelcast Java Client, as shown below.
<hazelcast-client>
<cluster-name>${cluster.name}</cluster-name>
</hazelcast-client>hazelcast-client:
cluster-name: ${cluster.name}If you do not want to rely on the system properties, you can use the
XmlConfigBuilder or YamlConfigBuilder and explicitly
set a Properties instance, as shown below.
Properties properties = new Properties();
// fill the properties, e.g., from database/LDAP, etc.
XmlConfigBuilder builder = new XmlConfigBuilder();
builder.setProperties(properties);
Config config = builder.build();
HazelcastInstance hz = Hazelcast.newHazelcastInstance(config);