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Borea Deitz
Asked: 2019-02-08 11:27:26 +0800 CST

How do I find what package provides `javac`?

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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?

package-management java

2 Answers

  1. Best Answer

    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
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  2. 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

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