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JVMs The host.xml file can include one or more named JVM configurations. The configurations will include such details as the location of the JVM binary, heap sizes, environment variables, etc. The individual server configurations can refer to one of these JVM configurations by name and the Host Controller will use the named configuration to launch the server. Note that JVM configuration details can also come from the server-group element in domain.xml and from the individual server element (see below.) If configured in more than one place, the elements will be merged, with server element values taking priority over server-group values, which in turn take priority over the host-level jvm configuration.