apt-get install openjdk-7-jre
java -version
java version "1.6.0_27"
update-alternatives --config java
------------------------------------------------------------ * 0 /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 modo automático 1 /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 modo manual 2 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1051 modo manual