How to set JAVA_HOME and NUTCH_JAVA_HOME in ubuntu., I tried but while compile nutch with ANT but getting this error

Question

I'm very new to ubuntu, I have installed java and while compiling nutch am getting this error.

BUILD FAILED
/home/surukam/Desktop/Nutch/nutch/build.xml:101: Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.

Perhaps JAVA_HOME does not point to the JDK. It is currently set to /usr/lib/jvm/java-8-openjdk-amd64/jre I tried to check java location with which java It shows /usr/bin/java. I tried to set java with export JAVA_HOME=/usr/bin/java and tried to compile it shows JAVA_HOME not set in this path, It accepts when i gave this export JAVA_HOME=/usr. Now my question is I need to set my JAVA_HOME in this path JAVA_HOME="$(/usr/libexec/java_home -v 1.8)" and NUTCH_JAVA_HOME="$(/usr/libexec/java_home -v 1.8)". can anyone help me with this ? Thanks in Advance.

Answer 1

The error message Unable to find a javac compiler; suggesting that it is unable to find javac compiler, which is the javac binary. Try searching for javac on your system running javac -version and you can be sure if javac compiler is installed or not.

The package that provides java is openjdk-8-jre, by default it doesn't come with the javac compiler, only Java runtime environment. To install javac, run sudo apt-get install openjdk-8-jdk which will install javac, you can be sure if it is installed running which javac or javac -version after installation is done.