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.

Answer 1

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:

Answer 2

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

Answer 3

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

Answer 4

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

Answer 5

It was an Eclipse problem. When I tried to build it from the command line using

mvn package

it worked fine.

Answer 6

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.

Answer 7

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

 <dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.8.1</version>
  <scope>test</scope>
</dependency>

Answer 8

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.

Answer 9

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.