FDS and Tomcat : Flex Sample App - Contact Manager

[Former Community Member]

http://localhost:8080/samples/dataservice/contact/contactmgr.mxml



When loading, I see the contact list load with Randy Carter
as the default.



1. Click on New

2. Fill in my First and Last Name



I get the following error messages:



Error

Unable to access UserTransaction in DataService.



I followed these directions for Tomcat for installing JOTM
and editing the conf/server.xml for Tomcat




http://labs.adobe.com/wiki/index.php/Flex:Install_Instructions



Please advise on how I can get this sample app to be able to
add new Contact details.

[CathyM]

If you're getting the error message - "Unable to access
UserTransaction in DataService", then your transaction services is
not set up correctly. There is not enough detail in your message to
diagnosis what the issue is but this is what I would recommend and
the configuration that works for me.



(a) During development, get in the habit of running the
server in debug mode and check for errors in the server console and
logs frequently, especially when you encounter errors on the
client.



For FDS, you'll want to set debug level logging in
enterprise-services.xml. Restart the server after making changes.



(b) Double-check that JOTM is configured correctly.



These are the steps I used to get Flex running with Tomcat
5.5.17 and JOTM 2.0.10 - the latest versions.

With Tomcat, there are several different ways of configuring
the server so this is not the only way of doing things. The
directions under 'Configuring Tomcat' seems to have the most
details for all versions of Tomcat -
http://static.raibledesigns.com/downloads/howto-tomcat-jotm.html



i. drop the JOTM jars into <tomcat>/common/lib

ii. add the following line to my application configuration
file <tomcat>/conf/Catalina/localhost/samples.xml



<Context
docBase="c:/dev/flex/enterprise/apps/j2ee/samples"
privileged="true" antiResourceLocking="false"
antiJARLocking="false">

....

<Transaction
factory="org.objectweb.jotm.UserTransactionFactory"
jotm.timeout="60"/>

....

</Context>



iii. restart the server for good measure, check the logs
localhost-xxxx.log and catalina-xxx.log to be sure that everything
started correctly.



(c) Verify that transactions are working correctly with this
test JSP page. Just drop the jsp page into your web application and
access from the browser. If you see an exception, go back to the
JOTM setup. If you see, 'success'. Then proceed with the contact
manager example.



<%@ page import="javax.naming.*,javax.transaction.*" %>



<%

Context ctx = new InitialContext();

UserTransaction tx =
(UserTransaction)ctx.lookup("java:comp/UserTransaction");

tx.begin();

tx.commit();

%>

success!



(d) Run the contact manager sample and try to update a
contact. If you see "Unable to access UserTransaction in
DataService", then check the server console and server logs for
errors and/or exceptions.



- Cathy

[Former Community Member]

Thanks so much for your technical advice. I'm doing something
wrong since I could not get it to run due to my limited expertise
in setting up servers, configuration files, etc. So I gave up.



Instead, I reinstalled with the Integrated Jrun instead of
the custom install with all the manual tweaking needed with Tomcat.



The samples webapps worked fine on the first try with Jrun.
In addition, other problems I had with latest Tomcat 5.5, such as
running out of memory during loading are all gone when using Jrun
(and I do have 1.5 gigs of ram.. so tomcat must be leaking
somewhere).



Anyway, I finally have a working local server to play with
now.

[CathyM]

> with latest Tomcat 5.5, such as running out of memory
during loading



Depending on the application server default memory for the
application jvm, you may need to increase the default memory. As I
recall, this is the case with Tomcat. For the integrated JRun, we
run with the following jvm memory args -Xms32m -Xmx384m. You could
start with that.