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5363798
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2011-03-19T18:01:04.850
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2011-03-19T18:01:04.850
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5362941
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2
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6
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Assuming you wish to programatically determine this from a batch file, you can use the <code>reg.exe</code> tool, installed in <code>windows\system32</code>. The annoying thing about this tool is that there is no way to have it return only a exit code, so you have to suppress its output via redirection to nowhere. And it also generates an ERROR message when the value does not exist. <pre><code>@echo off rem rem DetectJvmInstalled.cmd rem reg.exe query "HKLM\Software\JavaSoft\Java Runtime Environment" /v "CurrentVersion" > nul 2> nul if errorlevel 1 goto NotInstalled rem Retrieve installed version number. rem The reg.exe output parsing found at http://www.robvanderwoude.com/ntregistry.php set JvmVersion= for /F "tokens=3* delims= " %%A IN ('reg.exe query "HKLM\Software\JavaSoft\Java Runtime Environment" /v "CurrentVersion"') do set JvmVersion=%%A rem if "%JvmVersion%" == "" goto NotInstalled :Installed echo JVM Version = %JvmVersion% exit /b 0 :NotInstalled echo JVM Not installed. exit /b 1 </code></pre> Things to note: <ul> <li>There are two redirections to the <code>nul</code> device, one for standard output and one for standard error.</li> <li>The detection is done separately from the value parsing to avoid showing an <code>ERROR...</code> message when the value does not exist.</li> <li>There is a space character after the <code>delims=</code> option (since space is the delimiter).</li> <li>The batch file returns an error level / exit code of zero if successful (installed) or 1 on failure (not installed).</li> </ul> Hope it helps.
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1. POHow to determine if the Java VM is installed on Windows?
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