php exec() for java on website doesn't work but works in server terminal -

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i have vps (linux server) downloaded 64-bit version of java. on terminal, able run commands such as:

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/jre/bin/java -version

and receive following output:

openjdk version "1.8.0_65" openjdk runtime environment (build 1.8.0_65-b17) openjdk 64-bit server vm (build 25.65-b01, mixed

so test website, used following php:

<?php    $output = array();   exec('/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/jre/bin/java -version', $output);    foreach($output $line) {     echo $line;     echo '<br/>';   }  ?>

but receive following error:

error occurred during initialization of vm not allocate metaspace: 1073741824 bytes

so far have tried following:

1) i've updated permissions on java that:

stat -c "%a %n" /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/jre/bin/java

returns:

755 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-0.b17.el6_7.x86_64/jre/bin/java

2) i've turned php safe-mode off

3) i've changed max memory in php.ini file 1.5gb

what causes error , how java program run without error?

i able reproduce error using bluehost's webspace, , fix it.

i running heavy java program though php method: shell_exec , java produced error:

error occurred during initialization of vm not allocate metaspace: 1073741824 byte

linux version:

uname -a linux box1.bluehost.com 1.2.50-39.elk6.x86_64 #1 smp mon nov 2 03:10:26 cst 2015 x86_64 x86_64 x86_64 gnu/linux

php version:

php --version php 5.4.43 (cgi-fcgi) (built: jul 13 2015 15:00:01) zend engine v2.4.0, copyright (c) 1998-2014 zend technologies zend guard loader v3.3, copyright (c) 1998-2013, zend technologies

java version:

java -version java version "1.8.0_71"

reproduce problem:

make test.php script under public_html, this:

<?php     shell_exec('java hungryjavaprogram > /home/user/mylog.log'); ?>

the java program called hungryjavaprogram allocates gigabyte of memory.

from browser, visit yoursite.com/test.php run php file. java program reports: 

error occurred during initialization of vm not allocate metaspace: 1073741824 byte

why happening?

the java program has requested more memory php has authorized.

solution #1, increase memory available:

find out how memory php has authorized programs running inside shell_exec can consume making php script , visiting in browser:

<?php    phpinfo(); ?>

look at: memory_limit see default is: 128m

find php.ini under public_html , find memory_limit variable , set 2048m. on bluehost changes take effect immediately. understand 1 rogue program might bring down server. keep low possible.

workaround solution #2, use php fastcgi.

in public_html directory in .htaccess file, saw this:

addhandler application/x-httpd-php54 .php

comment out , replace this:

addhandler fcgid54-script .php

and java program runs without error. though memory limit remains @ 128m, php doesn't seem enforce limit on java programs running within shell_exec("java myprogram").


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