FXML Checker

FXML Checker analyzes FXML markup to catch errors before runtime. It parses XML content, detects syntax and structural problems, and flags issues that would cause a JavaFX UI to fail at runtime. It is designed for developers who author or review FXML files, QA engineers validating UI markup, and build pipelines enforcing markup quality. The tool accepts FXML as text or as file streams and reports errors with exact line and column information, enabling rapid pinpointing of the root cause.

Conceptual operation: The tool builds a parse tree from the FXML input, then applies domain rules such as ensuring a single root element, matching start/end tags, validating fx:id declarations, and checking references to controllers and event handlers. It can operate in batch mode across multiple files, producing a project-wide report that highlights inconsistencies and potential misconfigurations. Outputs are structured, machine-readable, and suitable for CI integration.

Use cases: pre-commit checks to catch markup errors before merging; CI gates that enforce markup correctness in components; QA verification that UI definitions align with controllers; audits of large UI codebases to locate orphaned fx:id references. Unique differentiators include project-wide cross-file reference checks, explicit error codes, and a compact report designed for automated consumption.