@echo off
REM ============================================================================
REM Function: Fetch the max value of java option -Xmx in 32 bit Windows system
REM Version: 1.0 @ Sep 10 2014
REM ============================================================================

java -version >nul 2>&1
if errorlevel 1 (
    echo Please make sure you have:
    echo 1. Installed JDK or JRE
    echo 2. Created environment variable %%JAVA_HOME%%
    echo 3. Added environment variable %%JAVA_HOME%%\bin into %%PATH%%
    goto End
)

:StepHundred
for /l %%i in (1000,100,2048) do (
    java -Xmx%%im -version >nul 2>&1
    if errorlevel 1 (
        goto StepTen
    ) else (
        set "Xmx=%%i"
        echo Testing: -Xmx%%im OK
    )
)

:StepTen
for /l %%i in (%Xmx%,10,2048) do (
    java -Xmx%%im -version >nul 2>&1
    if errorlevel 1 (
        goto StepOne
    ) else (
        set "Xmx=%%i"
        echo Testing: -Xmx%%im OK
    )
)

:StepOne
for /l %%i in (%Xmx%,1,2048) do (
    java -Xmx%%im -version >nul 2>&1
    if errorlevel 1 (
        goto ShowResult
    ) else (
        set "Xmx=%%i"
        echo Testing: -Xmx%%im OK
    )
)

:ShowResult
echo Final value is: -Xmx%Xmx%m

:End
pause
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