How to set java_home on Windows 7?

Question

I went to the Environment Variables in 'System' in the control panel and made two new variables, one for user variables and one for system variables. Both were named JAVA_HOME and both pointing to

C:\Sun\SDK\jdk\bin

But for some reason, I still get the below error when running a Java command...

BUILD FAILED
C:\Users\Derek\Desktop\eclipse\eclipse\glassfish\setup.xml:161: The following error  occurred while executing this line:
C:\Users\Derek\Desktop\eclipse\eclipse\glassfish\setup.xml:141: The following error occurred while executing this line:
C:\Users\Derek\Desktop\eclipse\eclipse\glassfish\setup.xml:137: Please set java.home to a JDK installation

Total time: 1 second
C:\Users\Derek\Desktop\eclipse\eclipse\glassfish>lib\ant\bin\ant -f setup.xml
Unable to locate tools.jar. Expected to find it in C:\Program Files\Java\jre6\lib\tools.jar
Buildfile: setup.xml

How can I fix this problem?

Answer 1

One Image can fix this issue.

For More

Answer 2

In Eclipse: Window->Preferences->Java->Installed JREs

Use the search feature to make sure your latest Java installation is listed; then make sure it is the one that is checked. This should be a JDK not a JRE.

Answer 3

This is the official solution for setting the Java environment from www.java.com - here.

There are solutions for Windows 7, Windows Vista, Windows XP, Linux/Solaris and other shells.

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Example

Windows 7

1. Select Computer from the Start menu
2. Choose System Properties from the context menu
3. Click Advanced system settings -> Advanced tab
4. Click on Environment Variables, under System Variables, find PATH, and click on it.
5. In the Edit windows, modify PATH by adding the location of the class to the value for PATH. If you do not have the item PATH, you may select to add a new variable and add PATH as the name and the location of the class as the value.
6. Reopen Command prompt window, and run your Java code.

Answer 4

You have to first Install JDK in your system.

Set Java Home

JAVA_HOME = C:\Program Files\Java\jdk1.7.0 [Location of your JDK Installation Directory]

Once you have the JDK installation path:

• Right-click the My Computer icon on
• Select Properties.
• Click the Advanced system setting tab on left side of your screen
• Aadvance Popup is open.
• Click on Environment Variables button.

• Under System Variables, click New.
• Enter the variable name as JAVA_HOME.
• Enter the variable value as the installation path for the Java Development Kit.
• Click OK.
• Click Apply Changes.

Set JAVA Path under system variable

PATH= C:\Program Files\Java\jdk1.7.0; [Append Value with semi-colon]

Answer 5

You need to set it to C:\Sun\SDK\jdk (Assuming that is where the JDK is installed - It is not the default) - Do not put the \bin in C:\Sun\SDK\jdk\bin.

If your app only runs when you are logged in as the current user then put it in the user variables - If it needs to run for all users on your system then put it in System variables.

You might also need to add %JAVA_HOME%\bin to the path also (Also it depends on whether you run it from just the user or from all users, including System)

Answer 6

Run Eclipse as Administrator.

That solved my problem. I'm still digging for the logic behind it.