Maven“JAVA_HOME 应该指向 JDK 而不是 JRE”

Question

I had the following command working fine with OpenJDK

mvn clean install

I then uninstalled OpenJDK and installed Oracle JDK 8, and now when I run mvn clean install

The JAVA_HOME environment variable is not defined correctly This environment variable is needed to run this program NB: JAVA_HOME should point to a JDK not a JRE

I'm running Linux Mint 19, I did run into a few Stackoverflow questions related to the issue. Most where related to Windows and some that were related to Linux. The Linux ones recommended to run

sudo update-alternatives --config java

but in my case I get

There is only one alternative in link group java (providing /usr/bin/java): /usr/lib/jvm/java-8-oracle/jre/bin/java Nothing to configure.

Any idea how I can make mvn clean install work again?

Answer 1

May be java path configuration missing. You can follow this steps:

1. Create or export JAVA_HOME="JDK directory" . Ex. " C:\\Program Files\\Java\\jdk1.8.0_65 "
2. Create or export Path variable for PATH="JDK Bin DIrectory" . Ex. " C:\\Program Files\\Java\\jdk1.8.0_65\\bin "
3. Run command java -version from your terminal.Check it is correct or not.

Then configure maven. follow these steps : You can try to install maven globaly. you can skip these steps if already configured.just for check run mvn --version command for checking maven is installed correctly.

1. Download maven from maven download link

2. Create or export M2_HOME="MAVEN ROOT LOCATION". Ex. : E:\\SoftwareRepo\\building tools\\apache-maven-3.5.2

3. Create or export MAVEN bin folder location to PATH variable. For example: E:\\SoftwareRepo\\building tools\\apache-maven-3.5.2\\bin

4. Open terminal or cmd and run mvn --version to confirm maven is installed or not.

Answer 2

You may refer to the link to setup the JAVA_HOME for Linux -

https://docs.oracle.com/cd/E21454_01/html/821-2532/inst_cli_jdk_javahome_t.html

Setting up Maven again :

https://maven.apache.org/install.html

check whether the mvn -v command is working or not..

Then execute other commands with mvn..

Thanks :)

Answer 3

For mac or ubuntu users

Make sure java is installed, if you have installed java 1.7

echo 'export JAVA_HOME="$(/usr/libexec/java_home -v 1.7 -f)"' >> ~/.bash_profile 

or java 1.8, change the version accordingly.

echo 'export JAVA_HOME="$(/usr/libexec/java_home -v 1.8 -f)"' >> ~/.bash_profile

Then

source ~/.bash_profile

Now check,

echo $JAVA_HOME 

This should be pointing to correct java version.