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root@vhost104:/home/minecraft# update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1051      auto mode
  1            /opt/Oracle_Java/jre1.7.0_09/bin/java            1         manual mode
  2            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1051      manual mode

Press enter to keep the current choice[*], or type selection number:
root@vhost104:/home/minecraft# exit
exit
$ ls
mc
$ cd mc
$ ls
bukkit.yml  minecraft_server.jar  server.log      server.properties
help.yml    plugins               server.log.lck
$ java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui

$ java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui
208 recipes
27 achievements
2012-11-06 21:16:27 [INFO] Starting minecraft server version 1.4.2
2012-11-06 21:16:27 [INFO] Loading properties
2012-11-06 21:16:27 [WARNING] server.properties does not exist
2012-11-06 21:16:27 [INFO] Generating new properties file
2012-11-06 21:16:27 [INFO] Default game type: SURVIVAL
2012-11-06 21:16:27 [INFO] Generating keypair

java -version
java version "1.7.0_09"
OpenJDK Runtime Environment (IcedTea7 2.3.3) (7u9-2.3.3-0ubuntu1~12.04.1)
OpenJDK 64-Bit Server VM (build 23.2-b09, mixed mode)