JAVA HOME does not point to the JDK

Question

I am trying to follow a tutorial about how to use ant to build and run your application  I ve followed all the steps and have created the build file  but when I try to run ant it gives me this error      BUILD FAILED    home bilal tmp ant build xml 19  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-6-openjdk jre    Any ideas how to resolve this issue

User · Answer

I had a similar problem and it turned out the issue was having both versions 6 & 7 of OpenJDK. The answer comes from r-senior on ubuntu forums (http://ubuntuforums.org/showthread.php?t=1977619) --- just uninstall version 6:

sudo apt-get remove openjdk-6-*

make sure that JAVA_HOME and CLASSPATH aren't set to anything since that isn't actually the problem.

User · Answer

It looks like you are currently pointing JAVA HOME to  usr lib jvm java-6-openjdk jre which appears to be a JRE not a JDK   Try setting JAVA HOME to  usr lib jvm java-6-openjdk   The JRE does not contain the Java compiler  only the JDK  Java Developer Kit  contains it

User · Answer

You installed java     apt-get install default-jre   But not the JDK     apt-get install default-jdk

User · Answer

I am using Windows 7 and have struggled with the same issue  I fixed it by changing my environment variables    To change your environment variables click here  I added    JAVA HOME  bin  to the end of paths variable and added a new  JAVA HOME  variable and set its value to the location of my JDK  C  Program Files Java jdk1 8 0 11   After that I restarted my Node js command prompt and it worked   Please note you JDK directory may be different then mine  Also depending on your setup  you may need to restart you computer after setting the environment variables

User · Answer

The JAVA HOME you have above only points to the JRE  which does not contain the compiler   Set your JAVA HOME to   usr lib jvm java-6-openjdk      and try again

User · Answer

Execute     export JAVA HOME  usr lib jvm java-1 8 0-openjdk-1 8 0 141-3 b16 el6 9 x86 64   and set operating system environment   vi  etc environment   Then follow these steps    Press i  Paste  JAVA HOME  usr lib jvm java-1 8 0-openjdk-1 8 0 141-3 b16 el6 9 x86 64  Press esc Press  wq

User · Answer

I met this issue in rhel  my  JAVA HOME  usr lib jvm java-1 8 0-openjdk  which is a symbolic link   and ant complains   MY solution for this is to use the real jdk path in JAVA HOME  like    JAVA HOME  usr lib jvm java-1 8 0-openjdk-1 8 0 161-0 b14 el7 4 x86 64  It works for me

User · Answer

I just copied tools jar file from JDK lib folder to JRE lib folder  Since then it worked like a champ

User · Answer

On Ubuntu 14 04  I found two parts to solving the problem    Remove  jre from the environment variable  For me  export JAVA HOME  usr lib jvm java-7-openjdk-amd64  Install the JDK as well as the JRE  sudo apt-get install default-jdk

User · Answer

Make JAVA HOME variable point to a jdk installation  not jre   You are referencing the runtime environment  not the development kit - it can t find the compiler because its not there   From the line you posted  which states you have open-jdk you can just remove the jre at end   export JAVA HOME   usr lib jvm java-6-openjdk

User · Answer

Under Jenkins it complains like     usr lib jvm java-1 8 0-openjdk-1 8 0 191 b12-1 el7 6 x86 64  doesn   t look like a JDK directory  Reason   Unable to found any Dev Kit for JDK   Solution   Please make sure to install openjdk-devel package as well along with your JDK-1 8  version and reexport with     source    bash profile

User · Answer

I know this question is old but the accepted answer does not work anymore and since this is the fist link on google search i ll tell how i solved this problem   for eclipse using ubuntu   go to Window- Preferences- Ant- Runtime- Select Ant Home Entries and click on add external jars then find in file explorer where your jdk is  default is in  usr lib jvm   and in the lib folder of your jdk you will find the tool jar  select this one and click apply   try to build your project and things should work   note  i hadn t used ant for a long time but needed it for ycsb couchbase workload generator  http   www couchbase com wiki display couchbase Load Generator Setup  if anyone is was stuck on this

User · Answer

This is by design  You cannot use ant s java home  which is a java lang System property  interchangeably with how JAVA HOME is set in the OS environment  You are probably trying to assert the location of the Java compiler with a fundamentally different value from a different property layer -- i e  java home  from Ant s Java internals  points to the Java Runtime Environment at  lt any installed java pointed to by ant gt  jre while JDK HOME  from the OS environment  is usually set to  lt DOWNLOADED AND INSTALLED JAVA DEVELOPMENT KIT gt     See my question and answer here for more details  Where does Ant set its   39 java home  39   and is it wrong  and is it supposed to append   39  jre  39     The solution is to access the system environment property within Ant by using   env JAVA HOME   Specify which java to use explicitly in the Javac Task by setting the executable property to the javac path and the fork property to yes  see Ant s Javac Task Documentation   That way  it doesn t matter what Java environment Ant is running inside  the compiler is always clearly specified

User · Answer

Experienced this issue when trying to run the android emulator with Meteor 1 0 on elementary OS Luna  based on Ubuntu 12 04 LTS sources    openjdk-6-jdk was installed  as well as the jre   In the end  not expecting any success  I tried   sudo apt-get remove openjdk-6-    this resulted in fully expected errors  so I followed up with  sudo apt-get install openjdk-6-jdk   and things worked   Go figure

User · Answer

for centos yum -y install java-1 7 0-openjdk-devel x86 64  and update JAVA HOME  usr lib jvm java-1 7 0-openjdk x86-64

User · Answer

Once you update the JAVA HOME path as stated in the answer  you should do this    source    bashrc   This will refresh bashrc show the updated path in  JAVA HOME when you check again

[java] JAVA_HOME does not point to the JDK

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