Maven build failed Unable to locate the Javac Compiler in jre or jdk issue

Question

I have my JAVA HOME set to   C  Program Files  x86  Java jdk1 6 0 18   After I run maven install  I get this message from Eclipse   Reason   Unable to locate the Javac Compiler in    C  Program Files  x86  Java jre6    lib tools jar Please ensure you are using JDK 1 4 or above and not a JRE  the com sun tools javac Main class is required   In most cases you can change the location of your Java installation by setting the JAVA HOME environment variable    I m certain that this is the tricky part     Please ensure you are using JDK 1 4 or   above and       not a JRE   When I run configuration it s set to JRE6  How do I change it to JDK 1 6 which I have already installed   I even tried to modify the plugin    lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt version gt 2 0 2 lt  version gt       lt configuration gt           lt source gt 1 6 lt  source gt           lt target gt 1 6 lt  target gt           lt executable gt C  Program Files  x86  Java jdk1 6 0 18 bin lt  executable gt       lt  configuration gt   lt  plugin gt    Still I get the same error   I use the Eclipse Maven plugin  How can I change from JRE to JDK in Eclipse

User · Answer

Make sure the  -vm  in your eclipse ini is on two sperate lines  ie   -vm C  Program Files Java jdk1 6 0 06

User · Answer

If you set the JAVA HOME  and the problem persists try the following    I had the same problem  on a fresh installed PC    Assuming you are using Eclipse    Open Window  rarr  Preferences  rarr  Java  rarr  Installed jre s  Remove all you have there  add the desired you want to use  JDK  no JRE   In the same window open maven - installations  add the Maven installation you downloaded and extracted somewhere   Do not use the embedded Maven installation  It has some known bugs     That s all  Your project will not suffer from such problems

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Based on Compiling Sources Using A Different JDK  you will have to set the fork to true in your pom xml file

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Right click on menu Project  rarr  Properties  rarr  Java Build Path   Select the JRE System Path  rarr  Edit  Select the Workspace Default JRE  and point it to JDK   1 4

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I would guess that the location of the compiler is defined in a POM for the compiler plugin to be in the JRE location displayed  instead of the JDK location you have JAVA HOME pointing to

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Don t forget that if you are running your project from a particular Eclipse configuration  you should change the Java Runtime within  Run Configurations  --   Your maven configuration  --   JRE tab after you add the right JDK to your Eclipse preferences

User · Answer

Do Echo  JAVA HOME  and then mvn --version   The JRE path should be same    then go menu Window  rarr  Preferences  rarr  Java  rarr  Installed JRE s location should be same as what Java Home is showing

User · Answer

File eclipse ini needs the vm argument to point to your JDK location   Edit the eclipse ini file to point to your JDK home  something as follows -  -vm C  Program Files Java jdk1 6 0 06   This ensures that Eclipse would be running off the JDK and not any default JRE on your machine

User · Answer

I got the same problem using Run as -  Maven install in Eclipse  JAVA HOME and eclipse ini were OK and pointing to my latest JDK  But m2clipse used JRE  Using mvn install outside of Eclipse worked fine   In my case  I solved the problem as follows    Navigate in Eclipse  menu Window  rarr  Preferences  rarr  Java  rarr  Installed JREs There were two inactive entries for a JRE and JDK  The active one was the latest installed JDK  Delete all entries but the one Maven should use    I think Maven doesn t take into account which one is active

User · Answer

I had the same issue  None of the above worked  but this worked for me   I changed JAVA HOME from     jdk 1 8 0  to     jdk 1 8 0 jre

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You could try updating the JDK Eclipse is using  as follows   Add and set the JRE in menu Window  rarr  Preferences     rarr  Java  rarr  Installed JREs   JRE type  Standard VM JRE Name  jdk1 6 0 18 JRE home directory  C  Program Files  x86  Java jdk1 6 0 18   If this is not the case  it s possible that the brackets and spaces in the JAVA HOME path are causing issues  Try copying your JDK to a different location and updating your JAVA HOME

User · Answer

The solution to this problem is very simple     If you don t have Ant build file then generate it  In Eclipse you can easily create a Ant file   Refer to the link to create Ant build file  http   www codejava net ides eclipse how-to-create-ant-build-file-for-existing-java-project-in-eclipse    Now follow the given steps   1  Add your Ant build file in Ant view that is in view window   2  right click on your Ant build file and select Run As and the second option in that  Ant Build    3  Now a dialog box will open with various options and tabs   4  Select the JRE tab   5  You will see three radio buttons and they will be having JRE or JDK selected as an option   6  Look carefully if the radio button options are having JRE as selected then change it to JDK   7  Click apply   That s it

User · Answer

You need to indicate JAVA HOME in mvn ini  it s in the Maven folder  bin   and your problem will disappear

User · Answer

It sounds like Maven is using the JRE  not the JDK  Perhaps you installed Maven before installing the JDK    Check the settings files  There are three in total  system  user  and project  It s most likely in the installation configuration   M2 HOME conf settings xml  or  possibly  the per-user configuration    user dir   m2 settings xml

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Eclipse setup only  Do the following steps    Right click on Eclipse project Properties Java Build Path  rarr  Libraries Select JRE System Library  rarr  Click the Edit button Click  Installed JREs     button Edit JRE as  Set JRE Home   JAVA HOME or JAVA HOME jre   Screenshot

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Go to the Properties dialog and right click on the project   In Linked resources  add a new path called JAVA HOME and put in your JDK location  something like  C  Program Files Java jdk1 8 0 73    That s all

User · Answer

You try   Go to Preferences Java Installed JREs and add one for the location  C  Program Files Java jdk1 6 0 27 jre or something like that    Remove the one for C  Program Files Java jre6   As you can see  the path C  Program Files Java jre6    lib tools jar only makes sense if the first part  til the      is replaced by C  Program Files Java jdk1 6 0 27 jre

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I changed the configuration of maven-compiler-plugin to add executable and fork with value true    lt configuration gt       lt fork gt true lt  fork gt       lt source gt 1 6 lt  source gt       lt target gt 1 6 lt  target gt       lt executable gt C  Program Files Java jdk1 6 0 18 bin javac lt  executable gt   lt  configuration gt    It worked for me

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You can also make sure that Eclipse has all of the updated changes  To do this  right-click your project and then press the  Refresh  menu item

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I had exact the same problem  I had been searching and searching for days because all the babble about  put the -vm c  program files java jdkxxxxx bin  in the ini ar as argument for a shortcut did not at all help    Do I sound frustrated  Believe me  that s an understatement  I am simply furious because I lost a week trying to make Maven reliable    I had very unpredictable behavior  Sometimes it compiled and sometimes not  If I did a maven clean  it could not find the compiler and failed  If I then changed something in the build path  it suddenly worked again    Until I went to menu Window  rarr  Preferences  rarr  Java  rarr  Installed JRE s  I added a new JRE using the location of the JDK and then removed the JRE  Suddenly Maven ran stable   Maybe this is worth putting in letters with font-size 30 or so in the Apache manual   With all due respect  this is simply outrageous for the Java community  I can t imagine how many days were lost by all these people  trying to work out their problems of this kind  I cannot possibly imagine this is released as a final version  I personally would not even dare to release such a thing under the name beta software     Kind regards either way     After a week of tampering I can finally start developing  I hope my boss won t find out about this  It took me lots of effort to convince him not to go to  NET and I already feel sorry about it

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I have just installed Maven 3 0 4  set M2 HOME  M2 and JAVA HOME accordingly  I then ran the following commands   mvn archetype generate      mvn compile  I got failed message such as  maven unable to locate javac compiler   On my computer  I have by default JRE installed at C  program files java jre 1 6  And I have the other C  java jdk1 6 and JAVA HOME set to this C  java jdk1 6   I didn t see anything wrong with my setting  After searching  I decided to look into mvn bat  I echoed  JAVA HOME  every step and it displayed correctly as C  java jdk1 6  but when I run the command mvn --version  it displayed Java home  C  program files java jre1 1 6   Finally  I found out that I just need to set -Djava home c  java jdk1 6 as in the command below  and working fine now    MAVEN JAVA EXE   MAVEN OPTS  -classpath  CLASSWORLDS JAR   -Dclassworlds conf  M2 HOME  bin m2 conf   -Djava home  JAVA HOME    -Dmaven home  M2 HOME    CLASSWORLDS LAUNCHER   MAVEN CMD LINE ARGS   Note  This is for mvn on the command line and not with Eclipse

User · Answer

I had the same issue on Amazon Linux  It turns out I had to install the developer version of the JDK   sudo yum -y install java-1 7 0-openjdk-devel

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As mentioned by several others  the Eclipse Window  rarr  Preferences     rarr  Java  rarr  Installed JREs should point to the JDK you installed  not to the JRE  Only then it can find the    lib folder mentioned in the error message   Even with this  the problem may recur  My way out in Eclipse nbsp v4 2  Juno  is to do a menu Maven  rarr  Update project    after which the problem disappears   I suspect the reason is that some of the Eclipse generated files   classpath   project   preferences  are in Subversion for the project in which I m having these problems  Thus  an SVN update introduces the problem  and an configuration update from Maven in Eclipse resolves it again   Real solution  omit Eclipse generated  files from version control  and let the Maven Eclipse plugin handle project configuration   Additional pointers suggestions are welcome

User · Answer

Go to Eclipse  rarr  Preferences  rarr  Java  rarr  Installed JREs  rarr  select the JRE location you have pointed to and click on Edit  rarr  Add External JARs and select the tools jar file

User · Answer

Many other answers tell you to point your Eclipse to a JDK instead of a JRE   Here is another answer with more specific clear  than I have seen in any answer here  step-by-steps on how to do that   How do you install JDK   That is what for solved me for this same problem

User · Answer

The solution is simple  Sometimes the Eclipse Windows  rarr  Preferences  rarr  Java  rarr  Installed JREs pointing to C  Program files Java jre   When I changed it to C  Program files Java JDK 6 0 jre it is worked 100

User · Answer

I solved the issue by changing location of Installed JRE to the directory present in JDK itself  Setting proper value of JAVA HOME environment variable did not solve the issue      In my case  there are two directories   C  Program Files Java jdk1 7 0 03 -- gt  For JDK C  Program Files Java jre7 -- gt  For JRE   Initially I set C  Program Files Java jre7 as Installed JRE in Eclipse and I was getting the same error in case of Maven Ant was working fine    By changing the installed JRE to C  Program Files Java jdk1 7 0 03 jre7 as Installed JRE in Eclipse the issue is solved

User · Answer

Go to Eclipse s menu Window  rarr  Preferences     rarr  Java  rarr  Installed JREs should point to the JDK you installed  not to the JRE

User · Answer

In my case  in Eclipse menu Run  rarr  Debug Configurations   In the JRE tab selecting the JDK instead of the JRE solved the problem

User · Answer

I had the same error  because of the JUnit version  I had three 3 8 1  and I have changed to 4 8 1   So the solution is   You have to go to the POM  and make sure that you dependency looks like this   lt dependency gt     lt groupId gt junit lt  groupId gt     lt artifactId gt junit lt  artifactId gt     lt version gt 4 8 1 lt  version gt     lt scope gt test lt  scope gt   lt  dependency gt

User · Answer

Setting fork to true resolved the issue for me    lt configuration gt       lt fork gt true lt  fork gt       lt source gt 1 6 lt  source gt       lt target gt 1 6 lt  target gt   lt  configuration gt

User · Answer

Use menu Window  rarr  Preferences  rarr  Java  rarr  Installed JREs  rarr  Execution Environments -  click the checkbox on the right side

[java] Maven build failed: "Unable to locate the Javac Compiler in: jre or jdk issue"

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