Maven Unable to locate the Javac Compiler in

Question

When i try to generate a war file  it is showing some error like    ERROR  Unable to locate the Javac Compiler in   ERROR  C  Program Files Java jre7    lib tools jar   When i do echo  path  it shows   C  Windows System32 D  name name1 Softwares Maven apache-maven-3 0 4 b in C  Program Files Notepad     JDK HOME    When i do echo  JDK HOME   D  name name core java software Java Java 1 6 0 04 win jdk1 6 0 04 bin   I don t know why maven is refering to jre  when my environmental variable is jdk  I also changes installed JRE to jdk1 6

User · Answer

Its in Eclipse setup only   It has 4 steps TODO   Step 1   Right Click on Eclipse project Properties  Step 2   Java Build Path -  Libraries  Step 3   Select JRE System Library -  Click Edit button  -  Click Installed JREs    button  Step 4   Edit JRE as Set JRE Home   JAVA HOME  ScreentShot

User · Answer

Go to Window -  Preferences    -  Java -  Installed JREs  Edit JRE Home   JAVA HOME or JAVA HOME jre  For example if you use jdk1 6 0 04 which is installed in C  Program Files  do the following change   C  Program Files Java jdk1 6 0 04 jre or C  Program Files Java jdk1 6 0 04 instead of the default one which is at C  Program Files Java jre7

User · Answer

I had the same Error   because of JUNIT version  I had 3        3 8 1  and I have changed to 4 8 1    so the solution is   you have to go to 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

None of the current answers helped me here   We were getting something like    ERROR  Failed to execute goal org apache maven plugins maven-compiler-plugin            compile  default-compile  on project Streaming Test  Compilation failure  ERROR  Unable to locate the Javac Compiler in   ERROR   opt java J7 0    lib tools jar   This happens because the Java installation has determined that it is a JRE installation   It s expecting there to be JDK stuff above the JRE subdirectory  hence the    lib in the path   Our tools jar is in  JAVA HOME lib tools jar not in  JAVA HOME    lib tools jar   Unfortunately  we do not have an option to install a JDK on our OS  don t ask  so that wasn t an option   I fixed the problem by adding the following to the maven pom xml      lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt configuration gt         lt fork gt true lt  fork gt    lt  -- not sure if this is also needed -- gt         lt executable gt   JAVA HOME  bin javac lt  executable gt         lt  --                               -- gt       lt  configuration gt     lt  plugin gt    By pointing the executable to the right place this at least got past our compilation failures

User · Answer

For others facing this issue in Eclipse even with path set to JDK correctly  you need to remove the other JREs from Installed JREs   Go to Window -  Preferences -  Java -  Installed JREs  Select unused JREs individually and Remove  It worked for me

User · Answer

I am able to resolved by doing following steps       Right click on project select Build path -  Configure build path -    select Libraries Tab -  then select JRE System Library version you   have for me its JavaSE-1 7  -   click Edit button -  In JRE System   Library window select Execution environment - In drop down you can   select the JDK listed for me its JavaSE-1 7 -  next to this click to   Environments button -  In Execution Environments window you have to   again select your java SE for me its JavaSE-1 7 -  just select it  you   will have options in Compatible JREs tab  so select JDK that you want   to have in my case its jdk1 7 0 25         Click ok and finish the rest windows by doing appropriate action   Ok Finish     Lastly do Maven Clean and Maven Install

User · Answer

I tried all of the above suggestions  which did not work for me  but I found how to fix the error in my case   The following steps made the project compile succesfully   In project explorer  right-click on project  select    properties    In the tree on the right  go to Java build path  Select the tab    libraries      Click    Add library      Select JRE system library  Click next  Select radio button Alternate JRE  Click    installed JRE   s     Select the JRE with the right version  Click Appy and close  In the next screen  click finish  In the properties window  click Apply and close  In the project explorer  right-click your pom xml and select run as   maven build In the goal textbox  write    install     Click Run   This made the project build succesfully in my case

User · Answer

Though there are a few non-Eclipse answers above for this question that does not mention Eclipse  they require path variable changes  An alternative is to use the command line option  java home  e g    mvn package -Djava home  C  Program Files Java jdk1 8 0 161 jre    Notice the  jre at the end - a surprising necessity

User · Answer

It sounds like you have JDK HOME defined as a user variable and PATH defined as a System variable  or vice versa - echo  PATH  should not contain unresolved variables like      JDK HOME    Make sure that the  JDK HOME  bin path is on your PATH variable  unresolved  even if you have to put the path in explicitly

User · Answer

It was an Eclipse problem   When I tried to build it from the command line using   mvn package   it worked fine

User · Answer

In Eclipse  actions like importing Maven projects or invoking  Update Sources  runs in the same JVM in which Eclipse is running  If that JVM comes from JRE that isn   t part of JDK  there would be no Java compiler  the tools jar    So to launch Maven from within Eclipse  JRE used for launch also need to come from JDK  By default Eclipse registers JRE it is started in  but this can be configured on  Window   Preferences      Java   Installed JREs  preference page as mentioned above by Parthasarathy   Alternatively you can specify compilerId in the pom xml  so Maven won   t be looking for JDK when compiling Java code        lt plugin gt     lt artifactid gt maven-compiler-plugin lt  artifactid gt     lt configuration gt       lt compilerid gt eclipse lt  compilerid gt     lt  configuration gt     lt dependencies gt       lt dependency gt         lt groupid gt org codehaus plexus lt  groupid gt         lt artifactid gt plexus-compiler-eclipse lt  artifactid gt         lt version gt xxxx lt  version gt       lt  dependency gt     lt  dependencies gt   lt  plugin gt

User · Answer

For Intellij Idea set everything appropriately  similarly to this    JAVA HOME   C  Program Files Java jdk1 8 0 60 JRE HOME   JAVA HOME jre   and dont forget to restart Idea  This program picks up variables at start so any changes to environtment variables while the program is running will not have any effect

User · Answer

I have encountered a similar problem  and as no one posted an approach similar to mine  here I go      Navigate to the run configuration you wanted to launch    There chose the JRE tab  Adjust the  Runtime JRE  there  and you re ready to go

User · Answer

The JDK HOME variable should always point to the base dir of the jdk  not the bin dir   D  name name core java software Java Java 1 6 0 04 win jdk1 6 0 04   That defined  fix your path to be   C  Windows System32 D  name name1 Softwares Maven apache-maven-3 0 4 bin C  Program Files Notepad     JDK HOME  bin

User · Answer

Had the same problem  but in my case  the directory eclipse pointed the JRE was the JDK  So  i searched for that tools jar and was there   I did    Java Build Path    Libraries JRE System Lybrary    Edit Installed JREs    click on my jdk    edit Add External Jars    tools jar   And then compiled fine

User · Answer

If you we are doing all above steps that may be confused and our problem is just missing tools jre so just add tools jre by the following steps and problem is solved   Step 1   In eclipse go to Windows -  preferences  Step 2   Java -  Installed JREs  Double click on it   Step 3   Click Edit button -  Click Add External JARs  Step 4   Now select tools jar path   now apply changes and it works fine   Here is screenshoot

User · Answer

It depends on of Maven version  When you will install newer version of Maven  this error would not appear  You may also add another directory with tools jar file lib tools jar - it also solve this problem

[java] Maven Unable to locate the Javac Compiler in:

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