1 files changed, 28 insertions, 6 deletions
diff --git a/dx/etc/dx.bat b/dx/etc/dx.bat
index 654588617..f2e3857df 100755
--- a/dx/etc/dx.bat
+++ b/dx/etc/dx.bat
@@ -22,12 +22,34 @@ REM Set up prog to be the path of this script, including following symlinks,
 REM and set up progdir to be the fully-qualified pathname of its directory.
 set prog=%~f0
 
-rem Check we have a valid Java.exe in the path.
-set java_exe=
-if exist    "%~dp0..\tools\lib\find_java.bat" call    "%~dp0..\tools\lib\find_java.bat"
-if exist "%~dp0..\..\tools\lib\find_java.bat" call "%~dp0..\..\tools\lib\find_java.bat"
-if not defined java_exe goto :EOF
-
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+exit /b 1
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+exit /b 1
+
+:init
 set jarfile=dx.jar
 set "frameworkdir=%~dp0"
 rem frameworkdir must not end with a dir sep.