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https://issues.apache.org/jira/browse/DERBY-2469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12503784
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Luigi Lauro commented on DERBY-2469:
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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: http://java.sun.com/products/javawebstart/
An example minimal JNLP:
<?xml version="1.0" encoding="UTF-8"?>
<jnlp codebase="http://db.apache.org/derby"/>
<information>
<title>Derby</title>
</information>
<resources>
<jar href="derby.jar"/>
</resources>
<application-desc main-class="org.apache.derby.impl.MAIN_DERBY_CLASS"/>
</jnlp>
> 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: 10.2.2.0
> Environment: Java Web Start
> Reporter: Luigi Lauro
> Assignee: David Van Couvering
> Priority: Minor
> Fix For: 10.3.0.0
>
> Attachments: svn-diff-20070329, svn-diff-20070606
>
>
> I would love to have Derby write/read to the storage area provided by the
> JNLP PersistenceService API.
> 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 IMHO.
> 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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