More questions

Is it a bad practice to call Hyperon parameters and functions from level of java code?

Yes, everything should be done through the Domain (given it is defined).

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Is Hyperon Runtime going to work on java 1.7?

Only for Hyperon versions previous to 1.5.79. Every version since 1.5.79 runs on Java 8.

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Does Hyperon Persistence support primitives types collections? What if as a result getter shows primitive type data, when it should be a collection?

Hyperon Persistence does not support collections of primitive type – you will have to create type such as StringContainer which has a single field “string” and then use it as Collection.

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How to set range of values within IN cell of the parameter?

In column „IN” definition choose matcher: between/ie or between/ii Now in column „IN” you can set range like: a-b or a:b Available matchers:

• between/ii reads your values as range: (both sides closed, value a and b are included in set range)
• between/ie reads your values as range a is included in set range

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Can Hyperon run on min 256MB max 1GB RAM server capability?

It’s really risky, because Vaadin GUI needs more RAM, at least in range : 512 MB to 2GB. However it is recommended to stay with max 3GB.