manual
/usr/bin/java
java.1.gz
/usr/share/man/man1/java.1.gz

/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java
1071
/usr/lib/jvm/java-7-openjdk-amd64/jre/man/man1/java.1.gz
/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
1069
/usr/lib/jvm/java-8-openjdk-amd64/jre/man/man1/java.1.gz