How to enable HotSpot or JIT compiler with java 1.4.0-rc

Sorry but I can't enable the JIT or Hotspot tecnology in java 1.4.0-rc? they are just installed in this JRE version or I have to do any operation to install these tevnology?
I can't also install the HotSpot server with this version of JRE! it's right? The installer ask me an older version to install this application!
can you help me?

Hi,
The Hotspot VM is now the only and default VM in 1.4 (Merlin).
Previously this was a -hotspot option but now is renamed -client (the default).
If you require the server VM then use -server after downloading the SDK. The Hotspot v2 server is for 1.3 and 1.2.2 only.
Regards,
Matt
Java Developer Technical Support
Sun Microsystems

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