ubuntu Cannot find System Java Compiler. Ensure that you have installed a JDK (not just a JRE) a
Solution 1
It was a problem with an environment variable. After correcting the java_home environment variable in etc/environment and restarting ubuntu, now it runs ok. Thanks for the guidance.
Solution 2
Install a JDK
sudo apt-get install openjdk-7-jdk
EDITED: initial answer had package for jre (not jdk)
Solution 3
None of these worked on my Ubuntu, really. Turns out, there is something like
/usr/lib/jvm/default-java
, which is a symbolic link to installed version of java.
The funny thing, this was pointing out to /usr/lib/jvm/java-7-openjdk-i386
(the JDK!), but JAVA_HOME
pointed to completely different location - the location where I have my current, up-to-date JDK8 installation.
I simply updated the symlink to point to correct location, but it is likely to be overridden with an update of OpenJDK7... I guess I have to get rid of OpenJDK then.
Solution 4
I was facing the same issue, after seeing this post, I tried doing
gradle -v
java -version
javac -version
javac failed. However, ubuntu prompted me to install javac with the following message
21:52:17->javac
The program 'javac' can be found in the following packages:
* default-jdk
* ecj
* gcj-4.8-jdk
* openjdk-7-jdk
* gcj-4.6-jdk
* openjdk-6-jdk
Try: sudo apt-get install <selected package>
After installing javac using openjdk-7-jdk and adding the following 2 lines to my bashrc, gradle started working
JAVA_HOME="/usr/lib/jvm/java-7-openjdk-amd64/jre"
PATH="$PATH:$JAVA_HOME/bin"
Here, /usr/lib/jvm/java-7-openjdk-amd64/jre is the directory containing java binary found by doing which java
Solution 5
-
Install JDK
sudo apt-get install openjdk-7-jdk
-
Make your $JAVA_HOME point to the newly installed JDK
echo $JAVA_HOME # prints nothing sudo echo 'JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64' >> /etc/profile source /etc/profile echo $JAVA_HOME # /usr/lib/jvm/java-7-openjdk-amd64
-
Update your java command symlink
java -version # java version "1.6.0_32" # OpenJDK Runtime Environment (IcedTea6 1.13.4) (6b32-1.13.4-1~deb7u1) # OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode) which java # /usr/bin/java ls -l /usr/bin/java # lrwxrwxrwx 1 root root 22 Sep 20 21:22 /usr/bin/java -> /etc/alternatives/java ls -l /etc/alternatives/java # lrwxrwxrwx 1 root root 42 Sep 21 00:01 /etc/alternatives/java -> /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java sudo rm /etc/alternatives/java sudo ln -s /usr/lib/jvm/java-7-openjdk-amd64/bin/java /etc/alternatives/java java -version # java version "1.7.0_65" # OpenJDK Runtime Environment (IcedTea 2.5.1) (7u65-2.5.1-5~deb7u1) # OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)
-
Try again
gradle compileJava # :compileJava # BUILD SUCCESSFUL # Total time: 9.397 secs
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user584910
Updated on October 06, 2022Comments
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user584910 about 1 year
On ubuntu 12, I am trying to run example program of fuse-jna. I got below error message
syed@ubuntu:~/Downloads/fuse-jna-master/examples$ ./hellofs.sh ~/hellofs :compileJava FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':compileJava'. > Cannot find System Java Compiler. Ensure that you have installed a JDK (not just a JRE) and configured your JAVA_HOME system variable to point to the according directory. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. BUILD FAILED
running
java -version
command shows me:syed@ubuntu:~/Downloads/fuse-jna-master/examples$ java -version java version "1.7.0_15" OpenJDK Runtime Environment (IcedTea7 2.3.7) (7u15-2.3.7-0ubuntu1~12.10) OpenJDK Client VM (build 23.7-b01, mixed mode, sharing)
output of
javac -version
:syed@ubuntu:~/Downloads/fuse-jna-master/examples$ javac -version javac 1.6.0_27
these are installed on my system, see the picture here
http://i40.tinypic.com/2hf2j4z.png
Please guide me to run this program on Ubuntu
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andy almost 10 yearsJDK (not just a JRE), check do you have javac.exe. try run javac
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Ingo almost 10 yearsIt would be interesting to know what the shell scripts is actually doing. Run the script with bash -x to find out. And also what the JAVA_HOME variable is set to.
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user584910 almost 10 yearsit also not solved the issue. I am facing the same error message as i shared in first post.
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Ian Roberts almost 10 yearsYou mean
openjdk-7-jdk
, the jre is already there by the look of it. -
Noumenon about 8 yearsI'm on Windows so I checked all the rest of the Internet before finding your advice to check javac -version. Thanks!