Using ProcessBuilder to find version of Java -


i trying use java find out versions of java installed on machine. have:

list<string> commands = new arraylist<string>(); commands.add("java.exe"); commands.add("-version"); processbuilder pb = new processbuilder(commands); pb.directory(new file("c:\\program files\\java\\jdk1.6.0_45\\bin")); process p = pb.start(); bufferedreader stdinput = new bufferedreader(new inputstreamreader(p.getinputstream()));  while ((s = stdinput.readline()) != null) {     system.out.println(s); }

however, when run, while loop never executed stdinput empty. if take out commands.add("-version"), input output when running "java.exe" command on command line, seems adding -version arguement causing issues , indicates directory , java.exe commands correct. appreciated.

the output of java -version sent error stream - reading stream should result in proper output: 

bufferedreader stdinput = new bufferedreader(new inputstreamreader(p.geterrorstream()));

alternatively, can call redirecterrorstream(true) merge input , error streams. if wish print command line, can use inheritio on processbuilder.

the running java version can found without need processbuilder retrieving appropriate system property

system.out.println(system.getproperty("java.version"));

Comments

Post a Comment

Popular posts from this blog

javascript - Bootstrap Popover: iOS Safari strange behaviour -

i looking through twitter bootstrap documentation, , i'm interested in implementing dismissible popover when button clicked. here example bootstrap's docs: http://getbootstrap.com/javascript/#dismiss-on-next-click when press "dismissible popover" button os x safari browser works fine. when access same link above ios safari, button not work. is, popover not dismissed on click. why button not working ios safari? the example linked using data-trigger="focus" attribute. try changing data-trigger="click" . <a tabindex="0" class="btn btn-lg btn-danger" role="button" data-toggle="popover" data-trigger="click" title="dismissible popover" data-content="and here's amazing content. it's engaging. right?">dismissible popover</a>
Read more

Magento/PHP - Get phones on all members in a customer group -

i working on custom magento extension. working around adminhtml part , i've created custom form there. here form code: <?php class vivasindustries_smsnotification_block_adminhtml_sms_sendmass_edit_form extends mage_adminhtml_block_widget_form { public function _preparelayout() { $extensionpath = mage::getmoduledir('js', 'vivasindustries_smsnotification'); $head = $this->getlayout()->getblock('head'); $head->addjs('jquery.js'); $head->addjs('vivas.js'); return parent::_preparelayout(); } protected function _prepareform() { $form = new varien_data_form(array( 'id' => 'edit_form', 'action' => $this->geturl('*/*/save', array('id' => $this->getrequest()->get...
Read more

session - Logging Out Using PHP -

i have seen other programs regarding can't seem make work. doing wrong? want achieve after user logged out, going previous pages become restricted. i have 3 php files: 1. sample.php - main page username , password filled in 2. successful.php - user's page after logging in 3. logout.php - destorys session hinder user access pages after logging out sample.php </html> <form action="" method="post"> <table> <tr> <td>username:</td> <td>password:</td> </tr> <tr> <td><input type="text" name="username"></td> <td><input type="password" name="password"></td> </tr> <tr> <td><input type="submit" value="submit" name="submit"></td> </tr> </table> </form> </html> <?php $servername = "localhost"; $username = ...
Read more