How to check PATH variable for java already installed or not in a batch file

Question

I have a test.bat file where i need to write a script to check PATH VARIABLE for java already installed or not ?

 Conditions :-

  1) If yes then 
       a) Check for the java version .
       b) Check for JAVA_HOME env variable :-
           i) if no , create it.
           ii) if yes , get the JAVA_HOME value.
  2) If No then
   set JAVA_HOME to local path (embedded)



 I know the commands like :-
      For version
         -> java -version

      For variable path 
         -> echo %path%

      For Java variable path
         -> echo %JAVA_HOME%

But how to write script for these condition in batch file i.e .bat ? I'm very new to this so kindly give me your valuable answers or helpful links.

BenMorel · Accepted Answer · 2014-01-06 17:09:19Z

3

You can check with something like that:

@echo off
if defined JAVA_HOME (
if exist "%JAVA_HOME%\bin\javac.exe" goto okJavac
)

echo Java not found
exit 1

%okJavac
echo Java path "%JAVA_HOME%"
rem the end of your script

edited Jan 6, 2014 at 17:09

BenMorel

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answered Aug 5, 2013 at 9:59

Alexxx

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4 Comments

Little bird Over a year ago

:I tried your code but after double clicking on the test.bat file but i could see a glimpse of terminal which comes and disappear .Even i checked JAVA_HOME path location and its in right location as what you defined in your code. How can i resolve this problem ?

Little bird Over a year ago

@Tala : any solutions for this ?

Tala Over a year ago

Start your bat from cmd with K key added : /K yourfile.bat

Little bird Over a year ago

i tried :okJavac instead of %okJavac ....and its working . thanx Tala and Alexxx :)

Endoro · Accepted Answer · 2013-08-05 11:11:05Z

2

try this:

@ECHO OFF &SETLOCAL
for /f tokens^=2delims^=^"  %%a in ('java -version 2^>^&1') do set "JavaVersion=%%a"
IF NOT DEFINED JavaVersion ECHO no Java installed & GOTO :EOF
FOR /f "tokens=2delims=." %%a IN ("%JavaVersion%") DO SET "sub=%%a"

IF DEFINED ProgramFiles(x86) (
    IF NOT DEFINED JAVA_HOME SET "JAVA_HOME=%ProgramFiles(x86)%\Java\jre%sub%\bin"
) ELSE (
    IF NOT DEFINED JAVA_HOME SET "JAVA_HOME=%ProgramFiles%\Java\jre%sub%\bin"
)

SET "java_home"
PAUSE

answered Aug 5, 2013 at 11:11

Endoro

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Comments

Community · Accepted Answer · 2017-05-23 12:11:36Z

1

Check the appropriate MS guide for working with the batch files. You can check the output of the java -version in the way described here

edited May 23, 2017 at 12:11

CommunityBot

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answered Aug 5, 2013 at 10:03

wanderlust

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