Ytdyklly

I'd like to find what package is installed on Ubuntu 14.04 (server) that gives access to the javac command. The RHEL line of distros has yum provides for this, but there doesn't seem to be anything similar for the Debian family.

This AskUbuntu question suggests using dpkg -S and apt-file, but neither of these work:

$ sudo dpkg -S `which javac`

dpkg-query: no path found matching pattern /usr/bin/javac

apt-file search appears to work at first:

$ apt-file search javac

javacc: /usr/bin/javacc

Except that apt-cache policy shows that this package isn't even installed, so it's obviously not the package that provides javac.

$ apt-cache policy javacc

javacc:

  Installed: (none)

  Candidate: 5.0-5

How can I find out what package provides the javac command?

In some cases, additional sleuthing is required. In particular,

$ ls -l $(which javac)

lrwxrwxrwx 1 root root 23 May 24  2017 /usr/bin/javac -> /etc/alternatives/javac

shows that /usr/bin/javac is a symbolic link - so we can either use readlink to drill down:

$ dpkg -S "$(readlink -f $(which javac))"

openjdk-8-jdk-headless:amd64: /usr/lib/jvm/java-8-openjdk-amd64/bin/javac

or (seeing as it's an update-alternatives link)

$ update-alternatives --query javac

Name: javac

Link: /usr/bin/javac

Slaves:

 javac.1.gz /usr/share/man/man1/javac.1.gz

Status: auto

Best: /usr/lib/jvm/java-8-openjdk-amd64/bin/javac

Value: /usr/lib/jvm/java-8-openjdk-amd64/bin/javac



Alternative: /usr/lib/jvm/java-8-openjdk-amd64/bin/javac

Priority: 1081

Slaves:

 javac.1.gz /usr/lib/jvm/java-8-openjdk-amd64/man/man1/javac.1.gz

from which we can pick out the current value:

$ dpkg -S /usr/lib/jvm/java-8-openjdk-amd64/bin/javac

openjdk-8-jdk-headless:amd64: /usr/lib/jvm/java-8-openjdk-amd64/bin/javac

Looks like /usr/bin/javac is a symlink managed by update-alternatives. What do you see if you readlink -f /usr/bin/javac? If it's pointing somewhere else, perhaps check that location with dpkg -S? Or update-alternatives itself can tell you which options you have for a particular link, eg:

$ update-alternatives --config javac

There is only one alternative in link group javac (providing /usr/bin/javac): /usr/lib/jvm/java-8-openjdk-amd64/bin/javac

Nothing to configure.

So then:

$ dpkg -S /usr/lib/jvm/java-8-openjdk-amd64/bin/javac

openjdk-8-jdk-headless:amd64: /usr/lib/jvm/java-8-openjdk-amd64/bin/javac

All files in that package: https://packages.ubuntu.com/xenial/openjdk-8-jdk-headless/filelist