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For apache velocity, is there a difference between accessing variables with $ vs. $!{}. If so, what is it?
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Well, the reason is that the Velocity Engine has been deprecated for a while, and a lot of developers around the world need to find well-fitting alternatives. Let's begin and define the set for our test. We will compare the following engines: Apache Velocity.
Velocity can be used to generate web pages, SQL, PostScript and other output from templates. It can be used either as a standalone utility for generating source code and reports, or as an integrated component of other systems.
The Apache Velocity Engine is a free open-source templating engine. Velocity permits you to use a simple yet powerful template language to reference objects defined in Java code. It is written in 100% pure Java and can be easily embedded into your own applications. The engine is the core of the Apache Velocity Project.
Developer file used by Velocity, a Java-based template engine; written using the Velocity Template Language (VTL); contains VTL statements inserted in a normal text document; often used for auto-generating Web source code and class skeletons.
There's two differences, the second is formal and quiet.
Formal reference notations include the braces around the variable. The quiet notation includes the ! and means to output nothing if the reference does not exist. When combining them, you create a formal and quiet notation.
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