IBM User Guide for Java V7 on Windows > Troubleshooting and support > Problem determination > Windows problem determination

Setting up and checking your Windows environment

The operation of the JRE on Windows is controlled by a number of environment variables.

If you experience initial problems in running the JVM, check the following items:

PATH

The PATH environment variable must point to the directory of your Java™ installation that contains the file java.exe. Ensure that PATH includes the \bin directory of your Java installation.

CLASSPATH

The JRE uses this environment variable to find the classes it needs when it runs. This is useful when the class you want to run uses classes that are located in other directories. By default, this is blank. If you install a product that uses the JRE, CLASSPATH is automatically set to point to the .jar files that the product needs.

• Windows 32-bit large address aware support
  The 32-bit IBM JVM for Windows includes support for the /LARGEADDRESSAWARE switch, also known as the /3GB switch. This switch increases the amount of space available to a process, from 2 GB to 3 GB. The switch is a Windows boot parameter, not a command line-option to the JVM.

Parent: Windows problem determination

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