Hi Andre,
Thank you per help.
I resolved the problem!.
I noted my eclipse installation use java 1.6.0_26 but the jre version, not the jdk/sdk version.
From Window/Preferences/Java/Installed JREs, I removed jre and added an older version (jdk 1.6.0_18).
Next, in the Server view, double click on the server adapter -> cklick in Open launch configuration and in the class path folder remove current Bootstrap Entry (the old JRE), click on "Restore default entries" add "jdk 1.6.0_18". Apply and exit.
I go to the server view right click on Server adapter, choose "Start" and now I can see the normal activity on console whit the final message
"JBoss AS 7.0.0.CR1 "White Rabbit" started in 3469ms"