Batch file to execute a java application

Question

I have a java application I would like my Windows batch file to execute. May I know why the following batch file codes do not work and how I can correct them ? The script should check for 32bit Java first before proceeding to check for 64 bit Java.

I would also like my batch file to handle Java 6 and above versions and inclusive of JRE or JDK environments. How would I modify my batch file to handle them.

Batch Script:

@ECHO OFF 
IF EXIST "C:\Program Files (x86)\Java" (
    start C:\Program Files (x86)\Java\jre7\bin\java -jar %~dp0\JavaShop.jar
) ELSE (
    IF EXIST "C:\Program Files\Java" C:\Program Files\Java\jre6\bin\java -jar %~dp0\JavaShop.jar
    ELSE ECHO Java software not found on your system. Please go to http://java.com/en/ to download a copy of Java.
    PAUSE
)

didnt understand your question properly, do u want to execute a batch file from your java program? or You are trying to run your JavaShop.jar from your batch file? — Rajesh Pantula
– Rajesh Pantula, Commented Dec 22, 2011 at 13:06
What's the error here? Maybe names with spaces are a problem. Try to "double quote" them. — Simone-Cu
– Simone-Cu, Commented Dec 22, 2011 at 13:09
Please tell us what does not work and how you know it does not work. — Tae-Sung Shin
– Tae-Sung Shin, Commented Dec 22, 2011 at 13:10
when you execute this script what happens? does "C:\Program Files (x86)\Java\jre7\bin\java -jar %~dp0\JavaShop.jar" work from the prompt (outside any script)? — milan
– milan, Commented Dec 22, 2011 at 13:10

Brian · Accepted Answer · 2011-12-22 13:08:55Z

6

I think you're onto a loser if you try to anticipate all likely install paths. Surely if Java's available on the machine, it's already on its path, i.e. available via just:

java

Also in your "start" line, and assuming a hardcoded path was good enough, you would need " chars around the path, due to the space character in it.

answered Dec 22, 2011 at 13:08

Brian

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3 Comments

home Over a year ago

+1; e.g. I do never install my JDKs, JREs in default location.

thotheolh Over a year ago

I installed Java JDK as 64 bit and when I go to my command line and type java, it tells me it is not recognized. I need to specifically go to the 64 bit Java to execute it otherwise it wouldn't be recognized.

Brian Over a year ago

if you can't go to C:\ and run "java", then it's not on your machine's path. For more info here, read: java.com/en/download/help/path.xml

Efthymis · Accepted Answer · 2011-12-22 14:04:00Z

1

You have space characters in your execution path. Try this

@ECHO OFF 
IF EXIST "C:\Program Files (x86)\Java\jre7" (
    start "C:\Program Files (x86)\Java\jre7\bin\java.exe" -jar %~dp0\JavaShop.jar
) ELSE (
    IF EXIST "C:\Program Files\Java\jre6" 
    start "C:\Program Files\Java\jre6\bin\java.exe" -jar %~dp0\JavaShop.jar
    ELSE ECHO Java software not found on your system. Please go to http://java.com/en/ to download a copy of Java.
    PAUSE
)

The best thing to do though is to check if the environmental variable JAVA_HOME is set. If it is set, then java is installed in the system.

@ECHO OFF 
IF EXIST %JAVA_HOME% (
    start %JAVA_HOME%\bin\java.exe -jar %~dp0\JavaShop.jar
) ELSE (
    ECHO Java software not found on your system. Please go to http://java.com/en/ to download a copy of Java.
    PAUSE
)

If you don't have a JAVA_HOME set you could just try the java command itself.

@ECHO OFF 
IF EXIST java (
    start java -jar %~dp0\JavaShop.jar
) ELSE (
    ECHO Java software not found on your system. Please go to http://java.com/en/ to download a copy of Java.
    PAUSE
)

edited Dec 22, 2011 at 14:04

answered Dec 22, 2011 at 13:11

Efthymis

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3 Comments

thotheolh Over a year ago

I ran it and it says the syntax is incorrect without specifying.

Efthymis Over a year ago

@thotheolh which version? the JAVA_HOME one?

thotheolh Over a year ago

I noticed that my JAVA_HOME is not set despite Java 7 already installed in the system. Both versions had syntax incorrect errors.

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