[appengine-java] Re: Eclipse GWT update error

2009-09-15 Thread AndrewG

Miguel,

I have now tried this - but not had any luck making it work as yet.

I have downloaded and unzipped 'gwt-windows-1.6.4' - then put it into
eclipse/plugins.

If I try to 'Add App Engine SDK' - it just says: Failed to Initialise
App Engine SDK at ./gwt-windows-1.6.4 - don't know why.

One obvious thing - don't know if its significant - if you look inside
the dirs for the other gwt versions installed - they have a number of
things, like: appengine-sdk-plugin.jar, META-INF directory, etc as
well as an appengine-java-sdk-xxx directory, but the newly downloaded/
unzipped directory only contains a 'gwt-windows-1.6.4' sub-directory.

Andrew


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[appengine-java] Re: Eclipse GWT update error

2009-09-15 Thread AndrewG


Miguel,

thank you - just before I picked up yr msg I figured out that I had
tried to install it in the wrong place, and tried again. I have now
(re-)installed the 'web toolkit' at v1.6.4, but I haven't yet
reinstalled the app engine to its previous state.

With just the toolkit re-installed, I am now getting a different set
of errors: Project xxx is missing required library ..
com.google.appenginesdkbundle_1_2_1

where the missing jars are things like: appengine-tools-api.jar,
appengine-local-runtime-shared.jar, etc'.

does this mean that the gwt sdk v 1.6.4 is closely tied to the
appengine vn that was broken during the upgrade? - or is something
else wrong - at the moment eclipse has appengine v1.2.5 installed -
prior to the upgrade it was 1.2.1. I would like to get back to the
configuration that I had before the upgrade (which worked) - but the
only vn that I can see on the download page is v1.2.5 - so not sure
where to get the 1.2.1 version - or is this a red herring and the
errors are being caused by something else ?

Thank you,

Andrew
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[appengine-java] Re: Eclipse GWT update error

2009-09-15 Thread AndrewG

Miguel,

ok - I think that I am closer to the problem now.

At the moment I am running the web app under tomcat 6 with the re-
installed gwt 1.6.4 sdk, following the problematic upgrade.

There now appears to be what looks like a classloader problem - the
various servlets which this app runs cannot now be created. When the
web app starts you get the 'Error loading WebAppClassLoader' message -
and then 'ClassNotFoundException' for each of the servlets defined in
the project - so none of the servlets work.

I have checked that the entries visible in the 'Build Path' - and
everything seems right.

This problem appears to be isolated to the gwt project - if I create a
new dynamic web project from scratch in eclipse - it runs ok - so this
is not just something in the tomcat installation that has broken.

Also, if I run an 'export to war' of the web app - and run it in a
stand-alone tomcat web server - it seems to work.

My guess is that somehow - during the upgrade something in the low-
level classes which the web server has to class-load in order to
create and run servlets has got broken. Unfortunately, if this
assumption is right, I have no idea how to find out what the offender
might be and fix it.

Andrew

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