Databases
StackOverflow2013
Postsdbo
POWhy does BasicService.getCodeBase() return null when using file:// as URL protocol in the JNLP codebase attribute?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POWhy does BasicService.getCodeBase() return null when using file:// as URL protocol in the JNLP codebase attribute?
    primarykey
    data
    text
    <p>In a WebStart application, I'm using this code to retrieve programmatically the JNLP codebase:</p> <pre class="lang-java prettyprint-override"><code>package web.start.test; import java.net.URL; import javax.jnlp.BasicService; import javax.jnlp.ServiceManager; import javax.jnlp.UnavailableServiceException; import javax.swing.JOptionPane; public class WebStartTest { public static void main(String[] args) { try { BasicService basicService = (BasicService) ServiceManager.lookup("javax.jnlp.BasicService"); URL codeBase = basicService.getCodeBase(); JOptionPane.showMessageDialog(null, "Code base is: [" + codeBase + "]"); } catch (UnavailableServiceException exception) { throw new RuntimeException(exception); } } } </code></pre> <p>I'm using this JNLP descriptor to start the application:</p> <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;jnlp spec="1.0+" codebase="file:/d:/playground/eclipse/WebStartTest" href="WebStartTest.jnlp"&gt; &lt;information&gt; &lt;title&gt;WebStartTest&lt;/title&gt; &lt;vendor&gt;Web Start Tester&lt;/vendor&gt; &lt;/information&gt; &lt;security&gt; &lt;all-permissions/&gt; &lt;/security&gt; &lt;resources&gt; &lt;j2se version="1.7+" /&gt; &lt;jar href="target/WebStartTest-0.0.1-SNAPSHOT.jar" /&gt; &lt;/resources&gt; &lt;application-desc main-class="web.start.test.WebStartTest" /&gt; &lt;/jnlp&gt; </code></pre> <p>After packaging and signing the jar file, hitting Enter on the JNLP file starts the application successfully, but the pop-up message says: <strong>"Code base is: [null]"</strong>.</p> <p>The same code retrieves the codebase properly when deployed in a web server and launched via a JNLP file that uses "http://" instead of "file://" as the codebase protocol.</p> <p>Is there a way to retrieve the codebase of a WebStart application when deployed on a local (or shared network) drive using a JNLP descriptor with a "file://" codebase?</p> <p>If not, how else can I programmatically find the URL to the application directory in order to access resource files (that are not packaged within the jar files)?</p> <p>Moreover, from a best practices standpoint: is deploying a WebStart application in a shared network drive rather than in a web server (for the sake of simplicity) a reasonable approach, or is it rather a hack that should be avoided?</p> <p>Thank you.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USAndrei Juan
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POWhy does BasicService.getCodeBase() return null when using file:// as URL protocol in the JNLP codebase attribute?
      1. USAndrei Juan
      1. VTBountyStart
    2. VO
      singulars
      1. POWhy does BasicService.getCodeBase() return null when using file:// as URL protocol in the JNLP codebase attribute?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POWhy does BasicService.getCodeBase() return null when using file:// as URL protocol in the JNLP codebase attribute?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI was working Applet and had same issue. When I run applet from local machine it was not working properly but when I uploaded applet jar on web server its working fine. I don't know why but may be its security issue.
      singulars
      1. POWhy does BasicService.getCodeBase() return null when using file:// as URL protocol in the JNLP codebase attribute?
      1. USVicky Thakor
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload