Here are both command paths:

root@jenkins-server /h/jenkins> which java
/bin/java
root@jenkins-server /h/jenkins> which javac
/bin/javac

While checking mvn, I notice that Java home is set to JRE instead of JDK:

[jenkins@jenkins-server ~]$ mvn --version
Apache Maven 3.5.2 (138edd61fd100ec658bfa2d307c43b76940a5d7d; 2017-10-18T08:
58:13+01:00)
Maven home: /usr/local/maven
Java version: 1.8.0_161, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.10.0-693.17.1.el7.x86_64", arch: "amd64", 
family: "unix"

Checking Java version:

[jenkins@jenkins-server ~]$ java -version
openjdk version "1.8.0_161"
OpenJDK Runtime Environment (build 1.8.0_161-b14)
OpenJDK 64-Bit Server VM (build 25.161-b14, mixed mode)

In this system I have several Java's versions installed in this system:

[root@jenkins-server ~]# sudo update-alternatives --config java

There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*+ 1           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-
1.8.0.161-0.b14.el7_4.x86_64/jre/bin/java)
   2           java-1.7.0-openjdk.x86_64 (/usr/lib/jvm/java-1.7.0-openjdk-
1.7.0.161-2.6.12.0.el7_4.x86_64/jre/bin/java)

[root@jenkins-server ~]# sudo update-alternatives --config javac

There is 1 program that provides 'javac'.

Selection Command
-----------------------------------------------
*+ 1 java-1.7.0-openjdk.x86_64 (/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.161-
2.6.12.0.el7_4.x86_64/bin/javac)

But dont know how to set mavens to use java JDK.

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