Comments on: Grails and Google AppEngine http://www.morkeleb.com/2009/07/14/grails-and-google-appengine/ Simple design for advanced constructions Mon, 06 Feb 2012 03:50:10 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Building Blocks » Grails and Google AppEngine Beginners Guide http://www.morkeleb.com/2009/07/14/grails-and-google-appengine/comment-page-1/#comment-300 Building Blocks » Grails and Google AppEngine Beginners Guide Sun, 13 Dec 2009 18:01:14 +0000 http://www.morkeleb.com/?p=465#comment-300 [...] Grails and Google AppEngine [...] [...] Grails and Google AppEngine [...]

]]> By: admin http://www.morkeleb.com/2009/07/14/grails-and-google-appengine/comment-page-1/#comment-151 admin Thu, 27 Aug 2009 07:49:28 +0000 http://www.morkeleb.com/?p=465#comment-151 I tried modifying the ants file so it wouldn't fork. I couldn't get it to work. If you have a working copy I'd be happy to update the post with it. I tried modifying the ants file so it wouldn’t fork. I couldn’t get it to work. If you have a working copy I’d be happy to update the post with it.

]]> By: Erik Bengtson http://www.morkeleb.com/2009/07/14/grails-and-google-appengine/comment-page-1/#comment-147 Erik Bengtson Wed, 26 Aug 2009 14:52:33 +0000 http://www.morkeleb.com/?p=465#comment-147 To avoid the 8192 limit, you can also disable fork when running your ant tasks To avoid the 8192 limit, you can also disable fork when running your ant tasks

]]> By: Andy http://www.morkeleb.com/2009/07/14/grails-and-google-appengine/comment-page-1/#comment-110 Andy Fri, 31 Jul 2009 16:14:43 +0000 http://www.morkeleb.com/?p=465#comment-110 No problem. I did read it, honest ;-) My point with "which tool" is that the DN enhancer can be run from the command line (with certain input), or via our Eclipse plugin (not Googles), or via Ant, or via Maven, or at runtime. Hence there are various "tools" that you may have been using. You said later you're using command line, so that answered the question. PS. I'm not from a Grails background so that side of it wouldn't make sense to me either way :-) No problem. I did read it, honest ;-) My point with “which tool” is that the DN enhancer can be run from the command line (with certain input), or via our Eclipse plugin (not Googles), or via Ant, or via Maven, or at runtime. Hence there are various “tools” that you may have been using. You said later you’re using command line, so that answered the question. PS. I’m not from a Grails background so that side of it wouldn’t make sense to me either way :-)

]]> By: Building Blocks » Grails and Google AppEngine on Windows http://www.morkeleb.com/2009/07/14/grails-and-google-appengine/comment-page-1/#comment-105 Building Blocks » Grails and Google AppEngine on Windows Mon, 27 Jul 2009 20:32:59 +0000 http://www.morkeleb.com/?p=465#comment-105 [...] a previous post I described a problem where the app-engine command would fail when enhancing the domain objects for [...] [...] a previous post I described a problem where the app-engine command would fail when enhancing the domain objects for [...]

]]> By: admin http://www.morkeleb.com/2009/07/14/grails-and-google-appengine/comment-page-1/#comment-104 admin Sun, 26 Jul 2009 21:17:29 +0000 http://www.morkeleb.com/?p=465#comment-104 If the previous reply seemed harsh it was not my intention. I appologies if the reply came out wrong. If the previous reply seemed harsh it was not my intention. I appologies if the reply came out wrong.

]]> By: admin http://www.morkeleb.com/2009/07/14/grails-and-google-appengine/comment-page-1/#comment-103 admin Fri, 24 Jul 2009 20:22:11 +0000 http://www.morkeleb.com/?p=465#comment-103 I'm not sure you bothered to read the post. The issues is with enhancing the domain-classes using the datanucleus enhancer. Now the enchancement in Grails is done using Google's ant macros. The commandline arguments to the enhancer becomes too long to execute on windows. You can see the problem described on googles FAQ http://code.google.com/intl/nb/eclipse/docs/faq.html#datanucleuswindowserror, also noted in the post. It's the enchancer tool that doesn't run. When running the enhancer from the commandline my classes aren't enhanced. They complain that they cannot find the packaged files. For example running the enhancer on the classes in the package Test, causes an error saying that it can't find the class named Test.Classname. I'm quite sure that datanucleus enhancer tool runs perfectly with Grails, but I can't get it to work on my x64 Windows Machine. I will continuously post updates as I progress. I do not blame Datanucleus for any of the above stated problems. I believe that these are configuration issues, but I'm merely trying to help others whom run into the same issue. Nor have I contacted Datanucleus, since I do not believe that the issue is with Datanucleus software. I'd rather have a more concrete description of a potential problem before posting an issue. But I'm glad you noticed my post, hopefully during the next week there will be a new post with a suggested resolution. I’m not sure you bothered to read the post.

The issues is with enhancing the domain-classes using the datanucleus enhancer. Now the enchancement in Grails is done using Google’s ant macros. The commandline arguments to the enhancer becomes too long to execute on windows.

You can see the problem described on googles FAQ http://code.google.com/intl/nb/eclipse/docs/faq.html#datanucleuswindowserror, also noted in the post.

It’s the enchancer tool that doesn’t run.

When running the enhancer from the commandline my classes aren’t enhanced. They complain that they cannot find the packaged files.
For example running the enhancer on the classes in the package Test, causes an error saying that it can’t find the class named Test.Classname.

I’m quite sure that datanucleus enhancer tool runs perfectly with Grails, but I can’t get it to work on my x64 Windows Machine.

I will continuously post updates as I progress. I do not blame Datanucleus for any of the above stated problems. I believe that these are configuration issues, but I’m merely trying to help others whom run into the same issue. Nor have I contacted Datanucleus, since I do not believe that the issue is with Datanucleus software. I’d rather have a more concrete description of a potential problem before posting an issue.

But I’m glad you noticed my post, hopefully during the next week there will be a new post with a suggested resolution.

]]> By: Andy http://www.morkeleb.com/2009/07/14/grails-and-google-appengine/comment-page-1/#comment-101 Andy Sun, 19 Jul 2009 07:22:20 +0000 http://www.morkeleb.com/?p=465#comment-101 > I tried using the Datanucleus tool directly without success. > ... > are not named according to how Datanucleus would like it. Perhaps state which DataNucleus tool, and what is "without success", and then mention what is "not named according to how DataNucleus would like it". DataNucleus has no reported issues relating to Grails, so we're unlikely to respond when we don't know about something .... other than just happening to come across someone's blog .... > I tried using the Datanucleus tool directly without success.
> …
> are not named according to how Datanucleus would like it.

Perhaps state which DataNucleus tool, and what is “without success”, and then mention what is “not named according to how DataNucleus would like it”.

DataNucleus has no reported issues relating to Grails, so we’re unlikely to respond when we don’t know about something …. other than just happening to come across someone’s blog ….

]]> By: admin http://www.morkeleb.com/2009/07/14/grails-and-google-appengine/comment-page-1/#comment-100 admin Wed, 15 Jul 2009 20:45:50 +0000 http://www.morkeleb.com/?p=465#comment-100 <a href="#comment-99" rel="nofollow">@Alessio Spadaro </a> I agree, this would most likely be the best option for getting Grails to work on Windows machines. Atleast until we see some new releases of the enhancer. I'm not hoping for Microsoft to drop a hot-fix for this issue. I will see if this is a valid solution. If I find one I will naturally blog about it and inform on grails.org. @Alessio Spadaro

I agree, this would most likely be the best option for getting Grails to work on Windows machines. Atleast until we see some new releases of the enhancer. I’m not hoping for Microsoft to drop a hot-fix for this issue.

I will see if this is a valid solution. If I find one I will naturally blog about it and inform on grails.org.

]]> By: Alessio Spadaro http://www.morkeleb.com/2009/07/14/grails-and-google-appengine/comment-page-1/#comment-99 Alessio Spadaro Wed, 15 Jul 2009 08:12:16 +0000 http://www.morkeleb.com/?p=465#comment-99 Hi, i'm experiencing the same problem, but i didn't have time lately to see in to this. Following the bug opened on gae (issue 1862) i found a thread reporting this hint: DataNucleus provides a JAR containing the Enhancer ( datanucleus-enhancer.jar ). From J2SE 1.6 and forward, you can automatically enhance your classes when compiling your classes. Just add the datanucleus-enhancer.jar , datanucleus-cor.jar , jdo2-api.jar and asm.jar to the compiler classpath and the classes will be enhanced. (from http://www.jpox.org/servlet/forum/viewthread_thread,5394_offset,10 ) Under the assumption of using java6, this seems a good candidate for disabling the enhanching-stage, doesn't it? Best, Alessio Hi,
i’m experiencing the same problem, but i didn’t have time lately to see in to this.
Following the bug opened on gae (issue 1862) i found a thread reporting this hint:

DataNucleus provides a JAR containing the Enhancer ( datanucleus-enhancer.jar ). From J2SE 1.6 and forward, you can automatically enhance your classes when compiling your classes. Just add the datanucleus-enhancer.jar , datanucleus-cor.jar , jdo2-api.jar and asm.jar to the compiler classpath and the classes will be enhanced.

(from http://www.jpox.org/servlet/forum/viewthread_thread,5394_offset,10 )

Under the assumption of using java6, this seems a good candidate for disabling the enhanching-stage, doesn’t it?

Best,
Alessio

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