refactor(converters): group Java modules and share generated Ossie models

[wForget]

Summary

This PR is a partial implementation of #121.

It uses jsonschema2pojo-maven-plugin to generate Java models from core-spec/osi-schema.json and packages them as the shared ossie-common module for Java converters.

• Add a Maven reactor under converters/java
• Move ossie-common, Polaris, and Salesforce converters into the Java directory
• Generate shared Java POJOs from core-spec/osi-schema.json
• Replace Polaris' hand-written OsiModel with the generated models
• Use OsiSchema and SemanticModel at the Salesforce converter boundaries
• Produce thin Maven artifacts and executable -all.jar artifacts
• Update documentation, resource paths, and tests

Testing

• mvn -o clean verify
• 25 tests passed
• 14 Salesforce schema-dependent tests skipped because the external Salesforce schema is not included in the repository
• Apache RAT checks passed

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Related Issues

Checklist

Specification

• Spec changes are included in core-spec/ and follow the existing structure
• Spec changes have been discussed on the mailing list or in a linked issue
• Breaking changes to the spec are clearly called out in the summary

Converters

• Converter logic in converters/ is updated to reflect spec or ontology changes
• New converters include tests under the converter's test directory

Documentation

• docs/ is updated to reflect any user-facing changes
• New features or behaviors are documented with examples where appropriate
• CONTRIBUTING.md is updated if the contribution process changed

Tests

• All existing tests pass (pytest / CI green)
• New functionality is covered by tests

Compliance

• ASF license headers are present on all new source files
• No third-party dependencies are added without PMC/IPMC approval

[wForget]

javaName explicitly sets the jsonschema2pojo-maven-plugin generated root class name to OsiModel instead of deriving OsiSchema from the schema file name.

[Copilot]

Pull request overview

This PR refactors the Java converter ecosystem by introducing a converters/java Maven reactor with a shared schema-generated Java model (ossie-common) and updating the Polaris and Salesforce converters to consume those generated Ossie POJOs (removing Polaris’ hand-written model).

Changes:

• Added converters/java Maven reactor with modules: ossie-common, polaris, salesforce, plus a new Java CI workflow.
• Introduced schema-driven Java model generation from core-spec/osi-schema.json (shared as ossie-common) and migrated Polaris/Salesforce to use org.apache.ossie.model.*.
• Reworked Salesforce converter into a configurable “dynamic pipeline” architecture with mapping/handlers, updated docs/resources/tests, and produced shaded *-all.jar artifacts.

Reviewed changes

Copilot reviewed 25 out of 60 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ROADMAP.md	Updates converter paths to point at the new converters/java/... layout.
core-spec/osi-schema.json	Adds javaName to support schema-to-POJO generation.
converters/README.md	Documents the new Java reactor and shared ossie-common model module.
converters/polaris/src/main/java/org/apache/ossie/converter/polaris/OsiYamlGenerator.java	Removes old Polaris YAML generator tied to the hand-written model.
converters/polaris/src/main/java/org/apache/ossie/converter/polaris/OsiModelParser.java	Removes old Polaris YAML parser tied to the hand-written model.
converters/polaris/src/main/java/org/apache/ossie/converter/polaris/model/OsiModel.java	Removes Polaris’ hand-written OsiModel in favor of generated POJOs.
converters/java/salesforce/src/test/resources/examples/salesforceToOsi.json	Adds Salesforce JSON example used by integration tests.
converters/java/salesforce/src/test/resources/examples/osiToSalesforce.yaml	Adds Ossie YAML example used by integration tests.
converters/java/salesforce/src/test/java/org/apache/ossie/SalesforceToOsiConverterTest.java	Adds end-to-end tests for Salesforce → Ossie conversion and pipeline config.
converters/java/salesforce/src/test/java/org/apache/ossie/OsiToSalesforceConverterTest.java	Adds end-to-end tests for Ossie → Salesforce conversion and pipeline config.
converters/java/salesforce/src/test/java/org/apache/ossie/converter/OsiModelBindingTest.java	Tests binding between map-based pipeline structures and generated Ossie model classes.
converters/java/salesforce/src/main/resources/osi-salesforce-converter-config.yaml	Adds pipeline step ordering and direction-specific config.
converters/java/salesforce/src/main/resources/mappings.yaml	Adds base property path mappings for the generic mapping engine.
converters/java/salesforce/src/main/java/org/apache/ossie/validator/SchemaValidator.java	Adds JSON Schema validation (networknt) for converter inputs.
converters/java/salesforce/src/main/java/org/apache/ossie/util/PathUtils.java	Adds nested-path get/set and deep-copy helpers for map-based transformations.
converters/java/salesforce/src/main/java/org/apache/ossie/util/MappingUtils.java	Adds mapping utilities (prefix filtering, handled property extraction).
converters/java/salesforce/src/main/java/org/apache/ossie/util/DataStructureUtils.java	Adds safer map/list accessors and helpers for heterogeneous structures.
converters/java/salesforce/src/main/java/org/apache/ossie/mapper/PropertyMapper.java	Defines mapping provider interface for bidirectional property mappings.
converters/java/salesforce/src/main/java/org/apache/ossie/mapper/FileBasedPropertyMapper.java	Loads mappings.yaml and constructs reverse mappings.
converters/java/salesforce/src/main/java/org/apache/ossie/exception/ValidationException.java	Adds runtime exception type for schema validation failures.
converters/java/salesforce/src/main/java/org/apache/ossie/exception/InvalidInputException.java	Adds runtime exception type for invalid input cases.
converters/java/salesforce/src/main/java/org/apache/ossie/exception/ConversionException.java	Adds runtime exception type for conversion/pipeline failures.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/SemanticModelMappingHandler.java	Maps top-level model properties and integrates extension handling/defaults.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/RelationshipMappingHandler.java	Implements relationship conversion logic, filtering, and SF criteria mapping.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/pipeline/PipelineStep.java	Defines pipeline step interface for handler execution.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/pipeline/PipelineConfigLoader.java	Loads pipeline configuration YAML into runtime config.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/pipeline/PipelineConfig.java	Holds pipeline + per-direction configuration models.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/pipeline/HandlerFactory.java	Creates handlers from config via a registry-style factory.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/pipeline/DirectionConfig.java	Stores format/schema/name-extraction settings per direction.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/OsiModelBinding.java	Bridges map-based pipeline input/output with generated Ossie POJOs.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/MetricMappingHandler.java	Handles SF→Ossie metric wrapping; omits Ossie→SF metric mapping.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/GenericMappingEngine.java	Applies straightforward path mappings (scalar + array mappings).
converters/java/salesforce/src/main/java/org/apache/ossie/converter/DatasetMappingHandler.java	Maps datasets↔semanticDataObjects, applies defaults, stores extensions.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/CustomExtensionHandler.java	Stores/restores vendor properties via custom_extensions round-tripping.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/ConverterImpl.java	Updates Salesforce converter implementation to use generated Ossie model at boundaries.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/ConverterFactory.java	Adds factory entry point for creating the converter implementation.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/ConverterConstants.java	Centralizes constants for keys/structures/dialects/defaults.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/Converter.java	Defines converter API (file + string conversion).
converters/java/salesforce/src/main/java/org/apache/ossie/converter/ConversionDirection.java	Defines direction enum and config key mapping.
converters/java/salesforce/src/main/java/org/apache/ossie/converter/AbstractConverter.java	Adds shared YAML/JSON parsing, output writing, and mapper loading.
converters/java/salesforce/src/main/java/org/apache/ossie/app/OsiSalesforceConverter.java	Adds CLI entry point for the Salesforce converter.
converters/java/salesforce/README.md	Updates build/run instructions for the Java reactor and shaded jar outputs.
converters/java/salesforce/pom.xml	Switches to reactor parent, depends on ossie-common, shades -all.jar, copies canonical schema at build.
converters/java/README.md	Adds top-level docs for the Java reactor layout and build commands.
converters/java/pom.xml	Introduces the Java reactor parent POM and module list.
converters/java/polaris/src/test/java/org/apache/ossie/converter/polaris/OsiPolarisConverterTest.java	Updates Polaris tests for generated model structure and YAML binding.
converters/java/polaris/src/main/java/org/apache/ossie/converter/polaris/PolarisImporter.java	Updates importer to produce generated model objects and extensions.
converters/java/polaris/src/main/java/org/apache/ossie/converter/polaris/PolarisExporter.java	Updates exporter to consume generated model objects (e.g., time dimension changes).
converters/java/polaris/src/main/java/org/apache/ossie/converter/polaris/PolarisClient.java	Adds a REST client for Polaris (Iceberg REST catalog interactions).
converters/java/polaris/src/main/java/org/apache/ossie/converter/polaris/OsiYamlGenerator.java	Replaces hand-written YAML generation with Jackson YAML binding of generated model.
converters/java/polaris/src/main/java/org/apache/ossie/converter/polaris/OsiPolarisConverter.java	Updates Polaris CLI to the generated model API (getSemanticModel(), etc.).
converters/java/polaris/src/main/java/org/apache/ossie/converter/polaris/OsiModelParser.java	Adds Jackson-based YAML parser into generated OsiModel.
converters/java/polaris/README.md	Updates build/run instructions and documents ossie-common usage/shaded jar output.
converters/java/polaris/pom.xml	Switches to reactor parent, depends on ossie-common, shades -all.jar, uses Jackson YAML.
converters/java/ossie-common/src/test/java/org/apache/ossie/model/OsiModelTest.java	Adds tests asserting deserialization/serialization of generated model types and canonical names.
converters/java/ossie-common/README.md	Documents schema-driven generation and the validation boundary (not a schema validator).
converters/java/ossie-common/pom.xml	Adds jsonschema2pojo generation config and artifact definition for the shared model.
.gitignore	Ignores IntelliJ .idea/ directories.
.github/workflows/java-ci.yml	Adds CI workflow to build/test the Java reactor on relevant changes.

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[wForget]

@jbonofre Could you please take a look? Thanks.