I am putting together a dev environment for a Java program and after the first try of my Ant build scripts I got this error:
Unable to locate tools.jar. Expected to find it in /usr/lib/jvm/java-6-openjdk/lib/tools.jar
While the path to the jdk is correct, the tools.jar really wasn't there. Is it actually supposed to be there or did I get some config/installation thing wrong?
It's there on my machine. I'm running Sun JDK 1.6.0_21 on Windows XP SP3.
Are you sure you have the JDK? Is it possible that you only have the JRE?
It seems like you can have Java installed in /usr/lib/jvm/java-6-openjdk but only have the JRE, not the JDK. This fixed it for me:
sudo apt-get install openjdk-6-jdk
Note: On CentOS / RHEL installing java-1.x.0-openjdk will not be enough. Also install java-1.x.0-openjdk-devel.
On Debian, after installing Ant with apt-get install ant, I've encountered the same error when running it:
Unable to locate tools.jar. Expected to find it in /usr/lib/jvm/java-6-openjdk-amd64/lib/tools.jar
Indeed, there's no mention of any tools.jar anywhere in /usr/lib, although /usr/lib/jvm/java-6-openjdk-amd64 itself does exist.
https://packages.debian.org/search?searchon=contents&keywords=java-6-openjdk-amd64%2Flib%2Ftools.jar
As per the search above, java-6-openjdk-amd64/lib/tools.jar appears to be part of openjdk-6-jdk, which indeed didn't get installed with ant (since it's only marked as suggested (https://packages.debian.org/wheezy/ant)).
apt-get install openjdk-6-jdk
apt install defalut-jdk # this doesn't contain some file, like tools.jar...
apt install openjdk-8-jdk # this contains all files.
On Ubuntu I've just need to install JDK
sudo apt-get install openjdk-7-jdk
..and you can always search for all available versions with
$ sudo apt-cache search openjdk | grep ^openjdk
From the website https://openjdk.java.net/install/ we can read
The openjdk-7-jre package contains just the Java Runtime Environment. If you want to develop Java programs then install the openjdk-7-jdk package.
Try the following:
% sudo apt-get install sun-java6-jdk
% sudo update-alternatives --config java
select the option that has the path
/usr/lib/jvm/java-6-sun/jre/bin/java
Worked for me on an ubuntu 10.4
u can try to put your JAVA_HOME also, as follows:
% sudo export JAVA_HOME=$(readlink -f /usr/bin/javac | sed "s:/bin/javac::")
Installing the jdk-6u45-linux-x64.bin (from the oracle.com site) via unzip does not result in a tools.jar. I guess that file is created by the "make-jpkg" script. Once I did that, and installed the resulting .deb file, everything was fine. I really hate oracle's lawyers.
Even if you have jdk installed, you'll need to redirect JAVA_HOME to point to it.
Here's one weird trick you can put into your .profile to set JAVA HOME properly, no matter which java you have:
export JAVA_HOME=$(dirname $(dirname $(readlink -e /usr/bin/java)))
# Test for jdk installed above jre
if [ -x $JAVA_HOME/../bin/java ]; then export JAVA_HOME=$(dirname $JAVA_HOME); fi
On Ubuntu I've fixed this problem by installing package
openjdk-7-jre-lib
tools.jar appeared after that.
(I know this is an old post, but comment in hope that it will be helpful for somebody lurking for answer like I was today.)
来源：https://stackoverflow.com/questions/5559956/ant-needs-tools-jar-and-unable-to-find-it