Finding java home directory during runtime

Hello dear all,
My problem is that i need to locate the java home directory dynamically during the runtime
of my application in order to use the /bin/jar tool.
Can you please provide me some help?
Thanks in advance,
Artemakis

The different OS's all have a facility (usually called environment variables) that contains OS parameters. If you place the location of the java home directory in one of the parameters it can be retrieved from within a Java program. An example entry would be JAVA_HOME=C:\Program Files\Java\jdk1.5.0_01 (in Windows)
The method to do this varies by version. Java 5 has a method in the System class, getenv(JAVA_HOME) that does this.
Earlier versions must pass the parameter name and value in at JVM startup, then the value can be retrieved by a java statement.
// This passes it in
java -DJAVA_HOME=C:\Program Files\Java\jdk1.5.0_01 <yourClass>
// This retrieves it
System.getProperty(JAVA_HOME);

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How do i find my <home directory> in order to clear it

In Mac...the 2 home directories that have to be erased under the "Unintall Flash Player" on the Adobe website. its Step 9
Date: Sat, 30 Nov 2013 11:49:55 -0800
From: [email protected]
To: [email protected]
Subject: How do i find my <home directory> in order to clear it
    Re: How do i find my in order to clear it
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defaults write /Library/Preferences/com.apple.loginwindow StartupDelay -int 45
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Re: Lion Update 10.7.2 Home Directory on another volume

Hi all,
Fought this for a few days.
Machine MacMini 2007 with 500GB Hard drive installed.
On OS X 10.6.x and OS X 10.7.1.x I had moved my home directory to another volume, as my Home directory was initially as big, and is now bigger than my boot drive. Installed 10.7.2 upgrade and after macine rebooted told me it could not find my home directory.
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3. Opened Terminal and checked external volume with my home directory on it /Volumes/Users/<HomeDirectoryName>, all files seemed to be there and intact
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5. In Terminal performed the following steps, and verified directories:
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7. Let computer cook until next morning. Tried setting home directory in Users Accounts/Login/Advanced to /Volumes/MyUser/<LoginName> still no joy!
8. Took Shower -- always get best ideas in shower! went back re-read MacWorld Articales on moving Home directory, and TUAW article.
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If Engineering will check to see if an existing directory exists for the Home directory and set it up, then the problem would not have happened.
Hope this helps Engineering and others with this problem.

I tried something a bit different that worked (so far). I always have a second Admin account that has its home directory still on the main Mac HD. I logged into that account and opened system prefs. Then I found my account and right clicked on it to get the "Advanced options." I reset the account's home folder (which said it was on the external drive) to the internal Mac HD.
Logged out of Admin account and back into my account, which showed as a new user account. Logged out and back in as Admin, then back to system prefs and "Advanced options" for my real account. Changed the path to my home folder on the external drive. Logged out of Admin, back to my account and it was fixed.
Hope this helps anyone having the same problem.

"Home Directory" full in mail

I can't use my mail as I keep getting this message:
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I can't find this 'home directory' and have no issues using mail on my other mac which is linked to the same pop account.

Hi surepure,
It sounds like you are using Filevault.
Filevault- "There isn't enough space on your hard disk..." alert ...
http://support.apple.com/kb/TS1974
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http://support.apple.com/kb/HT2631?viewlocale=en_US

Finding java home directory during runtime

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