Verifying the Derby system configuration

You should confirm that your computer has the correct software installed and that the environment variables are set before you start working with Derby.

1. Verify that the java executable file, version 5 or higher, is in your command execution PATH by opening a command window and running the java -version command. The output from the command looks something like this:

   java version "1.7.0_07"  
   Java(TM) SE Runtime Environment (build 1.7.0_07-b10)  
   Java HotSpot(TM) Client VM (build 23.3-b01, mixed mode, sharing)

   The output you see might be different from what is shown here because the java -version command outputs vendor-specific information. If the command produces an error or the version listed is not 5 or higher, install a JDK before continuing.
2. Verify that the DERBY_HOME environment variable is set and points to the root directory of the Derby 10.10 installation. Open a command window and run the appropriate command for your system. If you installed Derby in the /opt/Derby_10 directory on UNIX or the c:\Derby_10 directory on Windows, the command that you use and the expected output are shown in the following table.

   Table 1. Verifying the DERBY_HOME setting

   Operating System	Command	Output
   UNIX (Korn Shell)	echo $DERBY_HOME	/opt/Derby_10
   Windows	echo %DERBY_HOME%	C:\Derby_10

   If you receive an error or do not see the expected output, ensure that you have set the DERBY_HOME environment variable, as described in Setting the environment variables.