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Re: WebObjects jar frameworks and classpaths
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Re: WebObjects jar frameworks and classpaths


  • Subject: Re: WebObjects jar frameworks and classpaths
  • From: John Pollard <email@hidden>
  • Date: Fri, 16 Jan 2009 09:12:58 +0000

Chuck, thanks for your thoughts.

On 14 Jan 2009, at 03:16, Chuck Hill wrote:

Go to the Libraries tab, click Add Library, select WebObjects Frameworks, select your framework. You probably need to install it before doing this, I forget.

Is this also exactly equivalent to a line like this in the .classpath file?


<classpathentry kind="con" path="WOFramework/MPServerEOs"/>

Another very helpful guy on the Rome list said this:

[START QUOTE]
... it would seem to be a classloading bug. The code we use to load the plugin is effectively this:
Class clazz = Class.forName(_propertyValues[i], true, Thread.currentThread().getContextClassLoader())
Where _propertyValues[i] is a classname from a rome.properties file found on the classpath.
I don't know anything at all about Webobjects, but a bit of searching found this: http://lists.apple.com/archives/Webobjects-dev/2007/Mar/msg00644.html which seems to indicate that Webobjects classloading has some unique quirks (in particular the reference to " cross- your-fingers-if-you- have-two-classes-with-the-same-name" seems ominous). It may be worth forwarding this email to any webobjects experts to see if they have an opinion on why using Class.forName with the Thread context classloader doesn't seem to work. I've forward this to the ROME dev list in case anyone there has an opinion.
[END QUOTE]


For now I have had to throw everything back into /Library/Java/ Extensions to make things work.

I have to think how much time I've spent trying to take some jars (previously jasper reports, now rome) out of /L/J/E and into jar frameworks!

John



Chuck


On 8 Jan 2009, at 14:01, John Pollard wrote:

Lachlan,

Many thanks for your reply. I have updated to the latest Eclipse 3.4.1 and the latest WOLips nightly, but that does not resolve this issue. I am also posting to the rome mailing list to try from that angle, but a nightly build of the latest rome jar didn't help either.

I also tried adding the two jars to my application directly, cutting out the framework, but got the same outcome.

The rome jar only depends on the jdom dar, so shouldn't be too complicated. I will post back if I eventually find the reason for this.

John

On 6 Jan 2009, at 23:31, Lachlan Deck wrote:

Hi John,

On 07/01/2009, at 12:18 AM, John Pollard wrote:

A bit off topic, but I am struggling to make sense of this. Simply put I want to understand why I can't put a couple of jars into a WO framework and have the code still work as it does when the same jars are in /Library/Java/Extensions.

Not really off topic. This is a classpath issue.

Created a new WebObjects framework.
Manually moved two jar files (rome-1.0RC1.jar and jdom.jar) out of /Library/Java/Extensions into the new framework project's / Libraries sub folder

Good.

In Java Build Path properties, Libraries tab, Add Jars.. to add them in, then in the Order and Export tab tick them

Good.

In the app project, add the new framework as a dependency

Eclipse shows no compile time problems, so why the runtime error:
[java.lang.NoClassDefFoundError] com/sun/syndication/io/ ModuleGenerator


I will be very grateful for any pointers to help me solve this one; in particular why/when Eclipse is happy at compile time, but actually the classes are not found when run.

Are you running WOLips nightly and Eclipse 3.4.x? If not you might need to update WOLips/Eclipse to get the fix that I think went in late November.


The class that is not found is definitely in the rome jar.

Search the archives for Transitive. It's a transitive dependency problem.


with regards,
--

Lachlan Deck


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-- Chuck Hill Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects








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References: 
 >WebObjects jar frameworks and classpaths (From: John Pollard <email@hidden>)
 >Re: WebObjects jar frameworks and classpaths (From: Lachlan Deck <email@hidden>)
 >Re: WebObjects jar frameworks and classpaths (From: John Pollard <email@hidden>)
 >Re: WebObjects jar frameworks and classpaths (From: John Pollard <email@hidden>)
 >Re: WebObjects jar frameworks and classpaths (From: Chuck Hill <email@hidden>)

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