How do I check if the Java JDK is installed on Mac

Question

How do you check if Java SDK is installed on a Mac   Is there a command line for this

User · Answer

Make sure you correctly define the project s JDK and restart IntelliJ  full restart

User · Answer

Just type javac  If it is installed you get usage information  otherwise it would just ask if you would like to install Java

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If you are on Mac OS Big Sur  then you probably have a messed up java installation  I found info on how to fix the issue with this article  https   knasmueller net how-to-install-java-openjdk-15-on-macos-big-sur  Download the  tar gz file of the JDK on https   jdk java net 15  Navigate to the download folder  and run these commands  move the  tar gz file  extract it and remove it after extraction    sudo mv openjdk-15 0 2 osx-x64 bin tar gz  Library Java JavaVirtualMachines  cd  Library Java JavaVirtualMachines  sudo tar -xzf openjdk-15 0 2 osx-x64 bin tar gz sudo rm openjdk-15 0 2 osx-x64 bin tar gz  Note  it might be 15 0 3 or higher  depending on the date of your download   run  usr libexec java home -v15 and copy the output add this line to your  bash profile or  zshrc file  depending on which shell you are using  You will probably have only one of these files existing in your home directory     bash profile or    zshrc    JAVA HOME  Library Java JavaVirtualMachines jdk-15 0 2 jdk Contents Home   save the changes and make them effective right away by running  source    bash profile or source    zshrc check that java is working - run java -v

User · Answer

javac -version in a terminal will do

User · Answer

You can leverage the java home helper binary on OS X for what you re looking for   To list all versions of installed JDK      usr libexec java home -V Matching Java Virtual Machines  2       1 8 0 51  x86 64     Java SE 8   Library Java JavaVirtualMachines jdk1 8 0 51 jdk Contents Home     1 7 0 79  x86 64     Java SE 7   Library Java JavaVirtualMachines jdk1 7 0 79 jdk Contents Home   To request the JAVA HOME path of a specific JDK version  you can do      usr libexec java home -v 1 7  Library Java JavaVirtualMachines jdk1 7 0 79 jdk Contents Home     usr libexec java home -v 1 8  Library Java JavaVirtualMachines jdk1 8 0 51 jdk Contents Home   You could take advantage of the above commands in your script like this   REQUESTED JAVA VERSION  1 7  if POSSIBLE JAVA HOME     usr libexec java home -v  REQUESTED JAVA VERSION 2 gt  dev null    then       Do this if you want to export JAVA HOME     export JAVA HOME   POSSIBLE JAVA HOME      echo  Java SDK is installed  else     echo  Did not find any installed JDK for version  REQUESTED JAVA VERSION  fi   You might be able to do if-else and check for multiple different versions of java as well   If you prefer XML output  java home also has a -X option to output in XML      usr libexec java home --help Usage  java home  options         Returns the path to a Java home directory from the current user s settings   Options       -v --version    lt version gt         Filter Java versions in the  JVMVersion  form 1 X   or          -a --arch       lt architecture gt    Filter JVMs matching architecture  i386  x86 64  etc        -d --datamodel  lt datamodel gt       Filter JVMs capable of -d32 or -d64      -t --task       lt task gt            Use the JVM list for a specific task  Applets  WebStart  BundledApp  JNI  or CommandLine       -F --failfast                   Fail when filters return no JVMs  do not continue with default          --exec       lt command gt         Execute the  JAVA HOME bin  lt command gt  with the remaining arguments       -R --request                    Request installation of a Java Runtime if not installed       -X --xml                        Print full JVM list and additional data as XML plist       -V --verbose                    Print full JVM list with architectures       -h --help                       This usage information

User · Answer

Below command worked out pretty good   javac -version   I also manually verified by navigating to the Java Folder on my Mac   Library Java JavaVirtualMachines jdk1 8 0 131 jdk

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Type in  a terminal   which javac   It should show you something like   usr bin javac

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Open terminal  run command to see   javac -version Also you can verify manually by going to the specific location and then check  To do this run below command in the mac terminal  cd  Library Java JavaVirtualMachines    Then run ls command in the terminal again  Now you can see the jdk version  amp  package if exists in your computer

User · Answer

usr bin java home tool returns 1 if java not installed   So you can check if java is installed by the next way    usr libexec java home  amp  gt   dev null  amp  amp  echo  installed     echo   not installed

[macos] How do I check if the Java JDK is installed on Mac?

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