Eclipse maven plugin: Cannot run program "mvn" for WSO2 ESB SampleServices - wso2

Question

All are good if I used mvn clean install via command line inside SampleServices of the pre-packaged project. But it gives me this error when I try to mvn clean install it via eclipse m2e
Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.4.0:exec
(package) on project SampleServices: Command execution failed. Cannot
run program "mvn" (in directory
"/Users/johndoe/Project/ChickenEngine/SampleServices/target/capp"):
error=2, No such file or directory -> [Help 1]
I've tried using external maven located at /opt but still no success. I'm following this guide.

Answer 1

Eventually find out to pay more attention to problem
SampleServices\pom.xml configure exec-maven-plugin. Important part is maven itself is called as executable
<executable>mvn</executable>
<workingDirectory>${project.build.directory}</workingDirectory>
<arguments>....
This means that mvn.bat has to be in PATH. Use variable PATH or run eclipse from cmd, but before start of application execute
set PATH=%PATH%;c:\path-to-maven-bin-directory\
and only then
./eclipse.exe
and u will get in eclipse console
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] QueryDoctorEP ...................................... SUCCESS [ 2.855 s]
[INFO] GrandOakEP ......................................... SUCCESS [ 0.057 s]
[INFO] ClemencyEP ......................................... SUCCESS [ 0.064 s]
[INFO] PineValleyEP ....................................... SUCCESS [ 0.067 s]
[INFO] ChannelingFeeEP .................................... SUCCESS [ 0.044 s]
[INFO] SettlePaymentEP .................................... SUCCESS [ 0.051 s]
[INFO] HealthcareAPI ...................................... SUCCESS [ 0.776 s]
[INFO] PaymentRequestMessageStore ......................... SUCCESS [ 0.599 s]
[INFO] PaymentRequestProcessingSequence ................... SUCCESS [ 0.541 s]
[INFO] PaymentRequestProcessor ............................ SUCCESS [ 0.597 s]
[INFO] SampleServices_module .............................. SUCCESS [ 0.437 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 7.829 s
[INFO] Finished at: 2017-05-23T12:23:58+03:00
[INFO] Final Memory: 17M/209M
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 23.775 s
[INFO] Finished at: 2017-05-23T12:23:58+03:00
[INFO] Final Memory: 12M/201M
[INFO] ------------------------------------------------------------------------