Making sure JAVA_HOME is correctly set

Question

Pretty new to Java and also to Mac ... I want to make sure JAVA_HOME is set so in other programs I can use its path. So I did some Googling and here is what I got:

If I enter /usr/libexec/java_home in terminal I get this: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home but if I enter echo $JAVA_HOME in terminal, I don't get anything back.

Can you please tell me what is going on in here?

Thanks.

Answer 1

JAVA_HOME isn't set by default on OSX. You can resolve this by opening terminal and executing the following:

echo "export JAVA_HOME=`/usr/libexec/java_home`" >> ~/.profile     . ~/.profile 

This will cause JAVA_HOME to be set on startup (rather than just the current session), and immediately add it.

Answer 2

Checking JAVA_HOME path

Try running source .bash_profile prior to echo $JAVA_HOME in your root directory. This should correct the problem if you've set JAVA_HOME correctly. If you're not sure you're in your root directory, simply type cd ~, press enter and you're there.

• Explanation: source loads and runs your bash_profile.

If you haven't set JAVA_HOME correctly, following the instructions below should clear things up.

• vim .bash_profile — opens your bash_profile in Vim.

  • I've included a list of VIM commands you'll likely need to edit your .bash_profile below.

• export JAVA_HOME=$(/usr/libexec/java_home) — creates an ENV_VAR (Environment Variable) and sets/stores the home path of the JDK to (/usr/libexec/java_home).
• Exit vim and type the following at the terminal*
• source .bash_profile — loads and runs your updated bash_profile
• echo $JAVA_HOME — returns the value stored in the ENV_VAR JAVA_HOME, which is the home path of your JDK installation.

---

VIM Commands:

Vim is an editor to create or edit a text file. There are two modes in vim.

• Command Mode: user can move around the file, delete text, etc.

• Insert Mode: user can insert text.

Changing between modes:

Command mode to Insert mode

• type the appropriate letter for the action you want (a, A, i, I, o, O) -- details for letters below.

Insert mode to Command mode

• press Esc (escape key)

Text Entry Commands (Used to start text entry)

• a -- Append text following current cursor position

• A -- Append text to the end of current line

• i -- Insert text before the current cursor position

• I -- Insert text at the beginning of the cursor line

• o -- Open up a new line following the current line and add text there

• O -- Open up a new line in front of the current line and add text there

Cursor Movement Commands (only used in the commands mode.)

• h -- Moves the cursor one character to the left

• l -- Moves the cursor one character to the right

• k -- Moves the cursor up one line

• j -- Moves the cursor down one line

• nG or :n -- Cursor goes to the specified (n) line

• (ex. 10G goes to line 10)

• $ -- Move cursor to the end of current line

• 0 -- (zero) Move cursor to the beginning of current line

• w -- Forward one word

• b -- Backward one word

Exit Commands

• :wq -- Write file to disk and quit the editor

• :q! -- Quit (no warning)

• :q -- Quit (a warning is printed if a modified file has not been saved)

• ZZ -- Save workspace and quit the editor (same as :wq)

VIM Editor Commands -- full list

osxterminaljava