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It can be persisted to a data store, the state of that flow so that when a user returns, the flow can be resumed...

It refers to the flow execution number(e1) and step in that execution(s1)
Eg: if booking was made for the first time and if you are on the thrid step of it, then it
would be /booking?execution=e1s3

How can one setup an Email body using Velocity templates to have buttons, images in them ?

Would css help? If so how should they be attached to the head section of HTML in the template ?


If...

Configuration used is as follows,

appContext.xml
---------------
<bean id="entityManagerFactoryBean" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
...

What if i am having bean def something ike this...

<bean id="..." class="...Employee">
<!-- Dynamically how to set these values -->
<constructor-arg index="0"...

Spring Reference document is very good to start.

But i prefer Spring in Action by Craig Walls would be the best one to read for a beginner.

When to use formBackingObject() or referenceData() methods?

But when to use formBackingObject() and referenceData() methods?

Yes setter based injection should be the preffered type of injection,because as the more the number of arguments in the constructor leads to less readability.

I think the exact location of the configuration file on the filesystem should be specified for FileSystemXmlApplicationContext