Question 1

How to map vertices to case classes in Gremlin-Scala?

Accepted Answer

Use the @label annotation on case classes and the Marshallable macro; define classes outside scopes, save with 'graph + example', and load with 'v.toCC[Example]', as detailed in the README's mapping section.

Question 2

Gremlin-Scala vs Gremlin-Java: which is better for Scala projects?

Accepted Answer

Gremlin-Scala is superior for Scala projects due to its type-safe DSL and idiomatic API, while Gremlin-Java is better for pure Java environments or when avoiding Scala dependencies.

Question 3

How to handle transactions in Gremlin-Scala?

Accepted Answer

Transactions are not thread-safe per TinkerPop's implementation; the README notes that org.apache.tinkerpop.gremlin.structure.Transaction uses ThreadLocal, so caution is needed in concurrent settings.

Question 4

What graph databases are supported by Gremlin-Scala?

Accepted Answer

Any Apache TinkerPop 3-compatible database like JanusGraph, Neo4j, or Amazon Neptune; the examples project provides setups for different databases.

Question 5

How to build a custom DSL with Gremlin-Scala?

Accepted Answer

Define your ADT as case classes, create Steps with an implicit constructor, and import gremlin.scala.dsl._ to use for-comprehensions, as shown in the DSL specification examples.

Question 6

Is Gremlin-Scala compatible with Apache TinkerPop 4?

Accepted Answer

No, Gremlin-Scala wraps TinkerPop 3; the versioning uses the first three digits for TP3, so it may not support TP4 features without updates.

Question 7

How to serialize graphs in Gremlin-Scala?

Accepted Answer

Supports graphML, graphson, and gryo/kryo formats; use methods like 'graph.io(...).writeGraph' and 'readGraph' for serialization, as referenced in the GraphSerialisationSpec.

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