Claus Ibsen created CAMEL-23757:
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Summary: Add Java DSL model writer for full-circle DSL
transformation (XML/YAML to Java DSL)
Key: CAMEL-23757
URL: https://issues.apache.org/jira/browse/CAMEL-23757
Project: Camel
Issue Type: Improvement
Components: camel-core
Reporter: Claus Ibsen
Camel has generated model writers for XML (ModelWriter in camel-xml-io) and
YAML (YamlModelWriter in camel-yaml-io), both generated by Mojos extending
ModelWriterGeneratorMojo in camel-package-maven-plugin. These take Camel Model
objects and produce the target DSL output.
What is missing is the reverse direction for Java DSL — a writer that takes
Model objects and produces Java DSL source code. Since we already have parsers
that read XML and YAML into Model objects, adding a Java DSL writer would
enable full-circle transformation: Java <-> XML <-> YAML <-> Java.
*Motivation:*
- LLMs produce better output for Java DSL (most training data uses it) — a
mechanical transform from XML/YAML via the Model ensures correctness
- Migration path for teams moving from XML-based deployments to Java DSL
- Round-trip validation (transform A->B->A and verify equivalence)
- AI-assisted editing: edit in Java DSL (strongest LLM support), then transform
back to user's preferred format
*Implementation approach:*
# New Mojo: JavaDslModelWriterGeneratorMojo extending ModelWriterGeneratorMojo
# New Velocity template: model-java-writer.vm generating fluent Java DSL method
chains
# New runtime support class: JavaDslWriterSupport for string building,
indentation, fluent chaining
# New module or subpackage to host the generated JavaDslModelWriter
# Tests using existing XML/YAML test fixtures as round-trip inputs
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