How to call a program with parameters from batch script?

Question

I like to determine which Java runtime environments are available and check their versions. My code will output the correct jre paths but is unable to execute the java.exe.

What is the correct way to call a program with parameters from a batch script while the program path is a variable?

My script

@echo off


:findjres
for /d %%i in ("C:\Program Files\Java\jre*") do (
    set /a cpath+=1
    call :pushpath "%%i"
)
for /d %%i in ("C:\Program Files (x86)\Java\jre*") do (
    set /a cpath+=1
    call :pushpath "%%i"
)
goto :versjres


:pushpath
set tpath=%1
set xpath!%cpath%=%tpath:~1,-1%
goto :end

:versjres
for /f "usebackq delims==! tokens=1-3" %%i IN (`set xpath`) do (
    echo Array field number %%j have value %%k
    %%k\bin\java.exe --version
)

pause


:end

The error

Exception in thread "main" java.lang.NoClassDefFoundError: Files
Caused by: java.lang.ClassNotFoundException: Files
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: Files.  Program will exit.

halex · Accepted Answer · 2012-08-21 18:07:29Z

6

Changing the line

%%k\bin\java.exe --version

to

"%%k\bin\java.exe" -version

it worked for me.

answered Aug 21, 2012 at 18:07

halex

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2 Comments

burnersk Over a year ago

Awww, I am stupid - you are right. This happens if you work to long. Thank you, @halex!

Ben Richards Over a year ago

Given the error message above: "Could not find main class: Files.", I presume that java is stored in one of C:\Program Files or `C:\Program Files (x86)', the spaces are deliminating directory levels. Hence why the quotes works.

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