Not able to change the JDK in Mac OS using Jenv

Question

I am using Amazon corretto JDK and earlier had only 1.8 installed in my Mac OS, yesterday I installed Amazon corretto JDK 11 using the Mac OS package installer and after that it

Answer 1

Behind the scenes jenv uses the /Library/Java/JavaVirtualMachines directory.

Then you could also type /usr/libexec/java_home -V to show all the available JDKs and analyse your issue:

Matching Java Virtual Machines (4): 
11.0.2_2-OracleJDK, x86_64: "Java SE 11.0.2" /Library/Java/JavaVirtualMachines/OracleJDK-jdk-11.0.2.jdk/Contents/Home 
11.0.2_1-OpenJDK, x86_64: "OpenJDK 11.0.2" /Library/Java/JavaVirtualMachines/OpenJDK-jdk-11.0.2.jdk/Contents/Home 
1.8.0_11, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home 
1.7.0_45, x86_64: "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home 

/Library/Java/JavaVirtualMachines/OracleJDK-jdk-11.0.2.jdk/Contents/Home

In this exemple export JAVA_HOME=$(/usr/libexec/java_home -v 1.8) set the JDK 1.8 version.

Thus, you even could define the following aliases:

java11_OpenJDK_export='export JAVA_HOME=$(/usr/libexec/java_home -v 11.0.2_1-OpenJDK)'
java11_OracleJDK_export='export JAVA_HOME=$(/usr/libexec/java_home -v 11.0.2_2-OracleJDK)'
java7_export='export JAVA_HOME=$(/usr/libexec/java_home -v 1.7)'
java8_export='export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)'

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NB: The version to use after java_home -v is defined in each JDK installation in the Contents/Info.plist file section JVMVersion.

I changed it, to easily switch between the OpenJDK and the Oracle JDK:

$ tail -5 /Library/Java/JavaVirtualMachines/OpenJDK-jdk-11.0.2.jdk/Contents/Info.plist | head -2
JVMVersion
11.0.2_1-OpenJDK

$ tail -5 /Library/Java/JavaVirtualMachines/OracleJDK-jdk-11.0.2.jdk/Contents/Info.plist | head -2
JVMVersion
11.0.2_2-OracleJDK

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So, in your case as you have two 1.8 versions (1.8 and 1.8.0.252). It is more than likely that you should update their Contents/Info.plist file section JVMVersion.