Trying to run a jar from PHP

Question

After reading some of the posts in this website related to exactly the same issue I've got, I found that none of them were giving me a successful result:

How to run a jar from a web server using PHP

Run Java class file from PHP script on a website

why exec('java -jar file.jar') dont work on browser but works on command line?

I'm using a Windows Server 2008 R2 datacenter, 64 bits, it's an EC2 instance from AWS. The command that I use to run my jar in a php file is exec, which works for any phyton script and normal .exe programs. But when it comes to a jar, it does nothing.

This is my code (my jar needs 5 parameters):

$script = "java -jar scripts/IDW.jar 5 none 2 values_grid values";      
$result = exec($script, $output);
if ($result) {
    print_r($output);           
}
else {
    echo "Failed";
}
echo "<br/>Result: ". $result;

The result I have is:

Failed
Result:

When I run the jar on console, it runs perfectly, but not from PHP, which means I am passing the right parameter values at the above Php code.

Java version: 1.7.0_51 and PHP version: 5.4.26

I would highly appreciate any comments on this.

@d3l The path is adjusted already to java. The final part of it is: 'C:\Program Files\Java\jre7\bin;'. Also my 'Java environment variable' is set to 'C:\Program Files\Java\jre7'; — user3927433, Aug 11 '14 at 21:32
@Tyralcori I added a new line to show the $output and it is: 1, although my jar file should return a different output, actually, it should be many lines... — user3927433, Aug 11 '14 at 21:39

score 1 · Answer 1 · answered Aug 10 '14 at 18:28

1

You can check with shell_exec, system() and other function pctl function as well. These functions might be disabled, so before executing check them or you can use this as well

function execInBackground($cmd) { 
    if (substr(php_uname(), 0, 7) == "Windows"){ 
        pclose(popen("start /B ". $cmd, "r"));  
    } 
    else { 
        exec($cmd . " > /dev/null &");   
    } 
}

More detail found here.

answered Aug 10 '14 at 18:28

Hrishikesh Mishra

3,295
3
27
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Hi @Hrishikesh, I tried your code and it seems unstoppable. It never comes back. It's always waiting and I think it gets stuck. – user3927433 Aug 11 '14 at 21:42

score 0 · Answer 2 · answered Aug 10 '14 at 18:17

You have to do something like this:

//REPLACE THIS PATH WITH THE REAL JAVA PATH
$handle = popen(`"C:\\Program Files (x86)\\Java\\jre7\\bin\\java.exe arguments"`, "r"));
//You can read with $read = fread($handle, 2096)
pclose($handle);

exec will not work on Windows (for "external" executables) and in most cases you'll have to provide the full path to Java.

score 0 · Accepted Answer · edited May 23 '17 at 10:33

0

This is not a straight answer, but if calling java from Php does not work under any circumstances, you can also run jar files from Python scripts. I mean Php --> Python --> jar.

Calling Python scripts from Php always works for me.

This post helped me in the past:

Python: How can I execute a jar file through a python script

edited May 23 '17 at 10:33

Community

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answered Aug 13 '14 at 08:18

Web-GIS entrepreneur

154
3
7

Trying to run a jar from PHP

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