Sigh.
$ jdk_switcher use oraclejdk7 Switching to Oracle JDK7 (java-7-oracle), JAVA_HOME will be set to /usr/lib/jvm/java-7-oracle update-java-alternatives: directory does not exist: /usr/lib/jvm/java-7-oracle
Sigh.
$ jdk_switcher use oraclejdk7 Switching to Oracle JDK7 (java-7-oracle), JAVA_HOME will be set to /usr/lib/jvm/java-7-oracle update-java-alternatives: directory does not exist: /usr/lib/jvm/java-7-oracle