FindJavaHome.java revision e75c2484bff064fbbf51e92aed4f37b08e6427b7
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at
* trunk/opends/resource/legal-notices/OpenDS.LICENSE
* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at
* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
* add the following below this CDDL HEADER, with the fields enclosed
* by brackets "[]" replaced with your own identifying information:
* Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
*
* Copyright 2006-2008 Sun Microsystems, Inc.
*/
import java.io.*;
/**
* This program provides a simple utility that determines the location of the
* Java installation. The output will be in a form suitable for use in a
* JAVA_HOME environment variable.
*/
public class FindJavaHome
{
public static void main(String[] args)
throws Exception
{
String javaHome = System.getProperty("java.home");
File javaHomeDir = new File(javaHome);
if (! javaHomeDir.exists())
{
throw new Exception("System property java.home doesn't reference a " +
"real directory");
}
String javacPath = File.separator + "bin" + File.separator + "javac";
File javacFile = new File(javaHome + javacPath);
if (! javacFile.exists())
{
javacFile = new File(javaHomeDir.getParent() + javacPath);
if (javacFile.exists())
{
javaHomeDir = new File(javaHomeDir.getParent());
}
else
{
throw new Exception("Unable to determine Java compiler location " +
"from java.home property value " + javaHome);
}
}
System.out.println(javaHomeDir.getAbsolutePath());
}
}