Not able to switch java home properly in mac


Not able to switch java home properly in mac



I have two versions of Java in my mac and I am trying to switch from 1.8 to 1.7 for compiling one of my project which has 1.7 specific contents. Though I ran the following commands in the terminal:


$ alias setJdk1.7='export JAVA_HOME=$(/usr/libexec/java_home -v 1.7)'
$ setJdk1.7



With that, I can see the proper version in java -version and mvn -version.


$ java -version

java version "1.7.0_181"
Java(TM) SE Runtime Environment (build 1.7.0_181-b09)
Java HotSpot(TM) 64-Bit Server VM (build 24.181-b09, mixed mode)

$ mvn -version

Apache Maven 3.0.5 (...)
Maven home: *mvn path*
Java version: 1.7.0_181, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.7.0_181.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.13.5", arch: "x86_64", family: "mac"



However, the /usr/libexec/java_home still seems to be pointing to the 1.8 java only.


$ echo $(/usr/libexec/java_home)
/Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home



I am very new to mac and not really sure how I can toggle between versions. This is not allowing to successfully compile my project.




1 Answer
1



Maybe try using a function instead and setting up your command as follows:


setJdk1.7() {
export JAVA_HOME=$(/usr/libexec/java_home -v 1.7)
export PATH=$JAVA_HOME/bin:$PATH
}



Your command likely doesn't work because $JAVA_HOME is never added to your $PATH.


$JAVA_HOME


$PATH





This may be a dumb question, how do I execute a function? Should it be in a .bash? Anyways, I tried to run these two commands separately, the echo $JAVA_HOME gives the 1.7 version however the echo of /usr/libexec/java_home still shows 1.8
– SRS
Jul 2 at 3:11





To execute a function it's much like an alias, so you'd just do setJdk1.7 from the Terminal prompt. Can you please post the output of the command /usr/libexec/java_home -V.
– l'L'l
Jul 2 at 3:16


setJdk1.7


/usr/libexec/java_home -V





$ /usr/libexec/java_home -V Matching Java Virtual Machines (2): 1.8.0_151, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home 1.7.0_181, x86_64: "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_181.jdk/Contents/Home
– SRS
Jul 2 at 7:27





@SRS: Things seem in the correct place; are you always in the same terminal window while changing/checking versions? Also does export JAVA_HOME=$(/usr/libexec/java_home -v 1.7.0) make any difference (notice the zero on the end)?
– l'L'l
Jul 3 at 0:43


export JAVA_HOME=$(/usr/libexec/java_home -v 1.7.0)






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