How to check which version of Java, Maven, Gradle

Question

How to check which version of Java, Maven, Gradle, NodeJs installed on your machine and how to set environment variables for all these building tools or JDK ?

These are very basic usage questions, for which you can very quickly find the answer in the documentation of the tools you're talking about. — Jesper, Apr 16 '15 at 20:33
possible duplicate of [Getting version of java in runtime](http://stackoverflow.com/questions/2591083/getting-version-of-java-in-runtime) — Luke, Apr 16 '15 at 20:52

PAA · Accepted Answer · 2015-12-10T11:01:54.070

Goto your CMD (for Windows) or shell terminal (for linux / ubuntu)

To check which Java version and compiler version installed:

C:\>java -version
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)

Here you can check compiler version

C:\>javac -version
    javac 1.7.0_71

To check which version of Maven installed: Use(mvn -v or mvn version)

C:\>mvn -v
Apache Maven 3.2.5 (12a6b3acb947671f09b81f49094c53f426d8cea1; 2014-12-14T22:59:23+05:30)
Maven home: C:\apache-maven-3.2.5
Java version: 1.7.0_71, vendor: Oracle Corporation
Java home: C:\Program Files\Java\jdk1.7.0_71\jre
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows"

To check which version of Gradle installed:

C:\>gradle -version

    ------------------------------------------------------------
    Gradle 2.2.1
    ------------------------------------------------------------

    Build time:   2014-11-24 09:45:35 UTC
    Build number: none
    Revision:     6fcb59c06f43a4e6b1bcb401f7686a8601a1fb4a

    Groovy:       2.3.6
    Ant:          Apache Ant(TM) version 1.9.3 compiled on December 23 2013
    JVM:          1.7.0_71 (Oracle Corporation 24.71-b01)
    OS:           Windows 7 6.1 amd64

To check which version of node installed:

C:\>node -v

v0.12.0

Setting environment variables for

1) JAVA

Windows: Set the environment variable JAVA_HOME to C:\Program Files\Java\jdk1.6.0_21

Linux: export JAVA_HOME=/usr/local/java-current

2) Maven (extract distribution here (You can extract any where you want)

Windows:  C:\Program Files\Apache Software Foundation\apache-maven-3.2.1
Linux: /usr/local/apache-maven

Windows:-

M2_HOME=C:\Program Files\Apache Software Foundation\apache-maven-2.2.1
M2=%M2_HOME%\bin
MAVEN_OPTS=-Xms256m -Xmx512m

Linux: Open command terminal and set environment variables.

export M2_HOME=/usr/local/apache-maven/apache-maven-2.2.1
export M2=$M2_HOME/bin
export MAVEN_OPTS=-Xms256m -Xmx512m

3)

How to check which version of Java, Maven, Gradle

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