Find the java.exe location from java

Question

I am wondering if there is a way, from java, to find the location of the java.exe running the program?

My use case is that I am trying to have Java execute a batch script that needs JAVA_HOME to be set in the local environment. The environment that I am executing this on may not have JAVA_HOME set or even the java executable on the path, but I would assume that the JVM knows where its executable is located.

Is this the [same question](http://stackoverflow.com/questions/4871051/getting-the-current-working-directory-in-java)? — Scott Solmer, Oct 14 '13 at 21:44
Does `System.out.println(System.getProperty("java.home"));` work? — Justin, Oct 14 '13 at 21:45
Okay, what about [this one](http://stackoverflow.com/questions/9006127/find-absolute-java-exe-path-programatically-from-java-code)? — Scott Solmer, Oct 14 '13 at 21:50
take a look at PeterMmm's answer to http://stackoverflow.com/questions/4681090/how-do-i-find-where-jdk-is-installed-on-my-windows-machine — Justin, Oct 14 '13 at 21:50

score 5 · Accepted Answer · edited Jan 27 '16 at 17:04

5

 System.getProperty("java.home");

is one option. Which shows the following directory in my machine:

C:\Program Files\Java\jdk1.7.0_02\jre

Most important system properties are listed here.

edited Jan 27 '16 at 17:04

jaydez

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answered Oct 14 '13 at 21:43

Sage

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Nice edit completely changing your previous answer. Don't get me wrong, I like right answers, but when it's already been posted elsewhere... – T.J. Crowder Oct 14 '13 at 21:49
yeah. so true, i usually do this wrong, rechecked the linked page and then fixed it. ;) Are you the one who down voted me? :) – Sage Oct 14 '13 at 21:50
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@ Sage: No. By the time I got here, the incorrect answer had already been downvoted and you'd deleted it. I don't downvote correct answers, even when they really should be deleted because they duplicate other correct answers after the fact. – T.J. Crowder Oct 14 '13 at 21:54
After the downvote i rechecked page i have linked and fixed it. But if you think that i picked it from you, i can remove it smilingly if you want. +1 for you. ;) – Sage Oct 14 '13 at 21:55
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@ Sage: No worries, the important thing is the OP gets a resolution. Turns out this is a duplicate. – T.J. Crowder Oct 14 '13 at 21:56
@T.J.Crowder, I haven't yet used to this site. Though my account was created 1 year before, i am regular here for last 17 days. I am not talking about this one but my answer collided with other question's answer in 1-2 minutes elapse, happened to me several time. I even continue to edit my answer to get things right with details for 5 - 10 times. – Sage Oct 14 '13 at 22:01
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@ Sage: Yeah, happens all the time. Usually if I've posted an incorrect answer and later fixed it, but then notice that in the meantime, someone (hexacyanide, in this case) posted a correct one, I'll just delete mine unless it offers more information. – T.J. Crowder Oct 14 '13 at 22:03
uhh, can't delete the accepted answer :( why is that ? sorry i have just tried to remove it but it didn't work – Sage Oct 14 '13 at 22:17

score 4 · Answer 2 · answered Oct 14 '13 at 21:46

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The java.home property will supply the path to the currently running JRE, regardless of what is installed, or what JAVA_HOME is. See the Oracle documentation here.

System.getProperty("java.home");

answered Oct 14 '13 at 21:46

hexacyanide

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Already exists on SO [here](http://stackoverflow.com/questions/9006127/find-absolute-java-exe-path-programatically-from-java-code) – Scott Solmer Oct 14 '13 at 21:54
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That is true, but what point you are trying to make? It also exists in two other answers on this page, as well as the other question that I marked this question as a duplicate of. – hexacyanide Oct 14 '13 at 21:56
It's all for naught... – Scott Solmer Oct 14 '13 at 21:57

Find the java.exe location from java

2 Answers2

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