Technology Stack¶

FreeXmlToolkit is built using modern Java technologies and libraries to provide a robust, cross-platform XML and JSON processing environment.

Last Updated: March 2026 | Version: 1.6.3

Core Technologies¶

Java Platform¶

Java Verstemplate-management.mdion: Java 25 with preview features enabled
Build System: Gradle 8.x with Kotlin DSL
Application Framework: JavaFX 24.0.1 (included in Liberica Full JDK)

UI Framework¶

JavaFX: 24.0.1 for cross-platform desktop GUI (bundled with Liberica Full JDK)
FXML: Declarative UI layout with MVC architecture
AtlantaFX: 2.1.0 - Modern theme library for enhanced styling
RichTextFX: 0.11.7 - Advanced text editing component with syntax highlighting
ControlsFX: 11.2.3 - Extended JavaFX controls

Key Libraries¶

XML Processing¶

Saxon HE: 12.9 - XSLT 3.0, XPath 3.1 and XQuery processing engine
Jakarta XML Bind API: 4.0.4 - XML binding and marshalling
Apache Xerces: 2.12.2 (exist-db fork) - XSD 1.1 validation with assertions support

JSON Processing¶

Gson: 2.13.2 - JSON parsing and serialization
JSONPath: 2.10.0 (Jayway) - JSONPath query language support
JSON Schema Validator: 1.5.3 (NetworkNT) - JSON Schema validation (Draft 4-2020-12)

PDF Generation¶

Apache FOP: 2.11 - XSL-FO to PDF transformation
Apache PDFBox: 3.0.6 - PDF manipulation
Apache Batik: 1.19 - SVG processing and rendering

Digital Signatures¶

Apache Santuario: 4.0.4 - XML Security (XML-DSig)
BouncyCastle: 1.83 - Cryptographic operations for XML digital signatures
Java Cryptography Architecture (JCA): Native Java crypto support

Office Integration¶

Apache POI: 5.4.1 - Excel export for validation results

Utilities¶

Apache Commons Lang3: 3.20.0 - String manipulation and utilities
Apache Commons IO: 2.21.0 - File and IO utilities
Apache Commons Text: 1.15.0 - Text algorithms
Gson: 2.13.2 - JSON processing

Testing Framework¶

JUnit 5: Unit and integration testing
TestFX: 4.0.18 - JavaFX application testing framework
Mockito: Mocking framework for unit tests

Logging¶

Log4j2: 2.24.1 - Comprehensive logging framework
SLF4J: Logging facade for library compatibility

UI Enhancements¶

Ikonli: 12.4.0 - Icon packs (Bootstrap, FontAwesome, Feather, Win10)
CSSFX: 11.5.1 - CSS hot-reloading for development
Thymeleaf: 3.1.3 - Template engine for documentation generation

Architecture Components¶

Model-View-Controller (MVC)¶

Controllers: JavaFX controllers handling UI logic and user interactions
Services: Business logic layer for XML operations
Domain Models: Data transfer objects and entity representations
FXML Views: Declarative UI definitions

XSD Editor V2 Architecture (MVVM Variant)¶

The XSD Editor V2 uses a sophisticated MVVM variant: - Model Layer: Pure XsdNode tree with PropertyChangeSupport - Command Pattern: All editing operations for undo/redo (24 commands) - Observable Properties: Reactive UI updates without tight coupling - Incremental Rendering: Only changed nodes re-render

Core Services¶

XmlService¶

XML parsing, validation, and transformation
XPath and XQuery execution with context-aware autocomplete
Schema validation (XSD 1.0 and 1.1)
Document manipulation operations

XsdDocumentationService¶

Schema analysis and documentation generation
HTML/SVG documentation output
Technical annotation processing (XsdDocInfo)
Schema flattening and sample data generation

SchematronService¶

Schematron rule compilation and validation
Business rule processing
Integration with Saxon XSLT engine

SignatureService¶

XML digital signature creation and validation
Certificate management and generation
Cryptographic operations using BouncyCastle

IntelliSense System¶

org.fxt.freexmltoolkit.controls.intellisense/
├── XmlIntelliSenseEngine     # Main orchestrator
├── XsdIntegrationAdapter     # XSD-based suggestions
├── CompletionCache           # Performance caching
├── CompletionContext         # Context-aware completion
└── AttributeValueHelper      # Type-aware attribute editing

org.fxt.freexmltoolkit.controls.v2.editor.intellisense/
├── IntelliSenseEngine        # V2 main engine
├── ContextAnalyzer           # XPath context detection
├── XsdCompletionProvider     # XSD-based completions
└── IntelliSensePopup         # Completion UI

Key Features: - XPath-aware enumeration lookup: Correctly identifies enumeration values based on full XPath context - Context-sensitive suggestions: Different suggestions for elements, attributes, and text content - XSD constraint awareness: Shows only valid options based on schema

Template Engine¶

org.fxt.freexmltoolkit.service/
├── TemplateEngine            # Template processing
├── SchemaGenerationEngine    # Schema-based generation
├── XPathSnippetRepository    # XPath expression library
└── TransformationProfile     # XSLT transformation profiles

Thread Pool Architecture¶

Centralized thread management with 5 specialized pools: - CPU Pool: CPU-intensive operations (XSLT, validation) - IO Pool: File operations, network requests - UI Pool: JavaFX Application Thread operations - Scheduled Pool: Periodic tasks (memory monitoring) - Single Pool: Serial task execution

Build Configuration¶

Gradle Features¶

Java Toolchain: Configured for Java 25
Native Packaging: Cross-platform executable generation (jpackage)
Dependency Updates: Automated dependency update checking
Test Heap: 16GB max configured for large schema tests

Repository Configuration¶

repositories {
    mavenCentral()
    gradlePluginPortal()
}

Key Dependencies¶

dependencies {
    // XML Processing
    implementation("net.sf.saxon:Saxon-HE:12.9")
    implementation("jakarta.xml.bind:jakarta.xml.bind-api:4.0.4")
    implementation("org.exist-db.thirdparty.xerces:xercesImpl:2.12.2")

    // PDF Generation
    implementation("org.apache.xmlgraphics:fop:2.11")

    // UI Components
    implementation("org.fxmisc.richtext:richtextfx:0.11.7")
    implementation("io.github.mkpaz:atlantafx-base:2.1.0")
    implementation("org.controlsfx:controlsfx:11.2.3")

    // Security
    implementation("org.apache.santuario:xmlsec:4.0.4")
    implementation("org.bouncycastle:bcpkix-jdk18on:1.83")

    // Testing
    testImplementation("org.junit.jupiter:junit-jupiter:5.x")
    testImplementation("org.testfx:testfx-junit5:4.0.18")
}

Performance Optimizations¶

Memory Management¶

ExecutorService: Centralized thread pool for heavy operations
Memory Monitoring: Built-in memory usage tracking with configurable thresholds
Caching Systems: Intelligent caching for schemas, templates, and completion data
Lazy Loading: On-demand loading of resources and components

Processing Optimizations¶

Saxon HE Configuration: Optimized XSLT 3.0 and XQuery processing
Document Streaming: Memory-efficient XML processing for large files
Background Processing: Non-blocking operations to maintain UI responsiveness
Incremental Updates: Efficient handling of document changes

Cross-Platform Support¶

Native Packaging¶

jpackage: Java native packaging tool for platform-specific installers
JLink: Custom runtime images for reduced distribution size
Platform-Specific Builds: Windows (.exe), macOS (.dmg), and Linux (AppImage)

JavaFX Runtime¶

JavaFX 24.0.1 is bundled with Liberica Full JDK, providing: - Cross-platform GUI consistency - Hardware-accelerated graphics with automatic fallback to software rendering for maximum compatibility - Web content rendering (WebView) - Swing interoperability

Security Features¶

For detailed information about security protections, see the Security Features documentation.

Digital Signatures¶

XML-DSig: W3C XML Digital Signature support
Certificate Validation: X.509 certificate chain validation
Cryptographic Algorithms: Support for RSA, DSA, and ECDSA signatures
Key Generation: RSA 2048/4096-bit key pair generation

Input Validation & Attack Prevention¶

XXE Protection: Secure XML parser configuration prevents external entity attacks
SSRF Protection: URL validation blocks access to internal networks and metadata endpoints
XSLT Extension Security: Java extensions disabled by default to prevent code execution
Path Traversal Prevention: File access restricted to prevent directory escape
XPath Injection Prevention: Proper parameter escaping in XPath queries
Schema Validation: Strict validation against XSD 1.0/1.1 schemas

Development Environment¶

Recommended IDE Setup¶

IntelliJ IDEA: Primary development environment
JavaFX Scene Builder: Visual FXML design tool
Git: Version control system

Code Quality¶

Static Analysis: Built-in code analysis and inspection
Unit Testing: Comprehensive test coverage with JUnit 5
UI Testing: TestFX for JavaFX component testing
Documentation: Javadoc generation for API documentation

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Technology Stack¶

Core Technologies¶

Java Platform¶

UI Framework¶

Key Libraries¶

XML Processing¶

JSON Processing¶

PDF Generation¶

Digital Signatures¶

Office Integration¶

Utilities¶

Testing Framework¶

Logging¶

UI Enhancements¶

Architecture Components¶

Model-View-Controller (MVC)¶

XSD Editor V2 Architecture (MVVM Variant)¶

Core Services¶

XmlService¶

XsdDocumentationService¶

SchematronService¶

SignatureService¶

IntelliSense System¶

Template Engine¶

Thread Pool Architecture¶

Build Configuration¶

Gradle Features¶

Repository Configuration¶

Key Dependencies¶

Performance Optimizations¶

Memory Management¶

Processing Optimizations¶

Cross-Platform Support¶

Native Packaging¶

JavaFX Runtime¶

Security Features¶

Digital Signatures¶

Input Validation & Attack Prevention¶

Development Environment¶

Recommended IDE Setup¶

Code Quality¶

Navigation¶