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From "Luigi Lauro (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2469) Java Web Start JNLP PersistenceService API storage support
Date Tue, 12 Jun 2007 09:01:37 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12503784

Luigi Lauro commented on DERBY-2469:

JNLP Application Example (@David): Yes, I should have explained better how to make use of
my work in derby.

Let's split it in 2 steps:

A) Enable my StorageFactory with derby: this is where you guys have to help me. I really don't
know where to start here. I gave it a quick check, but from what I've seen, it seems the available
factories are somewhat hard-coded into derby, and so some tinkering will be needed to get
a derby starting using my JNLPStorageFactory.

Any help here from someone who knows how to do this, is really appreciated.

B) Setting up a Java Web Start Environment from where to run derby, in order to test the factory:
unluckily, there is *NO* way to manually load the JNLP APIs implementation classes in a non
java web start environment.

I first tried to do it myself but got stuck in initializing problems when trying to load the
PersistenceService implementation classes manually (you can read the whole story here: http://tech.groups.yahoo.com/group/junit/message/19132
). Then queried both the official sun JNLP forums, and junit users forum, but to no avail.

Therefore the only way I know to test my JNLPStorageFactory is to test it inside a real java
web start environment.

This means deploying a minimal derby jnlp application for testing. This is very easy to do
(you only have to 'describe' your application with a xml-like .jnlp file, and then open this
jnlp file with the java web start plugin), and you can check full info/docs/examples here:

An example minimal JNLP:

<?xml version="1.0" encoding="UTF-8"?>
<jnlp codebase="http://db.apache.org/derby"/>
    <jar href="derby.jar"/>
  <application-desc main-class="org.apache.derby.impl.MAIN_DERBY_CLASS"/>

> Java Web Start JNLP PersistenceService API storage support
> ----------------------------------------------------------
>                 Key: DERBY-2469
>                 URL: https://issues.apache.org/jira/browse/DERBY-2469
>             Project: Derby
>          Issue Type: New Feature
>          Components: Store
>    Affects Versions:
>         Environment: Java Web Start
>            Reporter: Luigi Lauro
>            Assignee: David Van Couvering
>            Priority: Minor
>             Fix For:
>         Attachments: svn-diff-20070329, svn-diff-20070606
> I would love to have Derby write/read to the storage area provided by the JNLP PersistenceService
> Since Derby is now bundled with the Java6 JDK as JavaDB, I think this  integration would
go a long way towards making derby more developer- friendly in Java Web Start environments,
where using the sandbox tools Sun provides us it the right way to go, instead of working 
around it and force the user to give the app the authorization to write on the hard drive
> I'm investigating the effort needed to provide an implementation of the WritableStorageFactory
interface around the PersistenceService API, and if that's doable in a few days work, I will
start working on it and submit a patch for testing/approval ASAP.
> Feel free to volounteer and provide pointers/hints/whatever, it's really appreciate,
especially since I currently know nothing of derby internals.

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