Without this log, it's not possible to know which version is used by the java runner.
Done in r4834.
Version would be shown as:
Java version: 1.6.0_29, vendor: Sun Microsystems Inc.
Maybe we also should add such information like Runner home, Java home, OS ?
Information about OS added in r4850.
Java home is useless, because version will be printed.
And Runner home is useless, because path to global settings would be printed.