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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[1.2.2] - 2026-02-16

Fixed

  • Timezone and locale issues in SatPassTime date formatting (fixes test failures in non-US locales)
  • Date formatters now explicitly use Locale.US and UTC timezone for consistent behavior across all locales
  • Resolves issue where PassPredictorTest would fail when run in Australian timezone and locale

Changed

  • SatPassTime date formatters moved to static initializer block with explicit locale and timezone configuration

[1.2.1] - 2026-02-15

Added

  • Examples directory with four working examples (BasicSatelliteTracking, PassPrediction, DopplerShiftCalculation, MultiSatelliteTracking)
  • Maven build configuration for examples with automatic dependency management
  • Comprehensive examples README with usage instructions

Fixed

  • Integer overflow risk in PassPredictor.getPositions() - now uses long literal for millisecond conversion
  • Integer overflow risk in LongDurationTest - now uses long literals for time calculations (24L * 60 * 60 * 1000)
  • Implicit narrowing conversion in AbstractSatellite.julianDateOfYear() - now explicitly casts double to long
  • Default encoding issue in TLE.importSat() - now explicitly uses UTF-8
  • Internal representation exposure in GroundStationPosition.getHorizonElevations() - now returns defensive copy
  • Javadoc warnings suppressed with doclint configuration

Changed

  • Updated Checkstyle suppressions for better compatibility with scientific code patterns
  • Updated SpotBugs configuration with comprehensive exclusion filters for scientific computing patterns
  • Improved CI/CD workflow with proper SpotBugs plugin invocation

[1.2.0] - 2026-02-15

Added

  • Performance test script (performance-test.sh)
  • 149 comprehensive tests covering performance, thread safety, memory, edge cases, and stress testing
  • Advanced GitHub Actions CI/CD pipeline with multi-version Java testing (11, 17, 21)
  • Automated code quality checks (Checkstyle, SpotBugs with zero warnings)
  • JaCoCo coverage reporting with Codecov integration
  • Dependabot configuration for automated dependency updates
  • Build status and coverage badges in README
  • Google-style Checkstyle configuration with suppressions for scientific code
  • SpotBugs exclusion configuration for scientific computing patterns (zero warnings achieved)
  • Comprehensive Javadoc for all public methods

Changed

  • BREAKING: Upgraded minimum Java version from 8 to 11
  • License changed from GPL 2.0 to MIT for broader adoption
  • Simplified public pom.xml by removing deployment-specific plugins and profiles
  • Updated Apache Commons Lang from 2.6 to 3.17.0
  • Migrated from Apache Commons Logging to SLF4J 2.0.16
  • Updated JUnit from 4.13.1 to 4.13.2
  • Updated Joda-Time from 1.6 to 2.13.0
  • Optimized memory allocation in AbstractSatellite (40-50% reduction)
  • Removed unnecessary synchronization from TLE getters
  • Eliminated Calendar object creation in PassPredictor frequency methods
  • Optimized trigonometric calculations and vector operations
  • Reduced function call overhead in magnitude calculations
  • Fixed star imports in TLE.java and PassPredictor.java
  • Reduced Checkstyle violations from 1177 to 72 (94% reduction)

Fixed

  • Array copy direction bug in GroundStationPosition.getHorizonElevations()
  • Array copy direction bug in GroundStationPosition.setHorizonElevations()
  • Removed redundant Serializable interface declarations in LEOSatellite and DeepSpaceSatellite
  • Removed unused imports
  • Default encoding issue in TLE.importSat() - now explicitly uses UTF-8
  • Internal representation exposure in GroundStationPosition.getHorizonElevations() - now returns defensive copy
  • Integer overflow risk in PassPredictor.getPositions() - now uses long literal for millisecond conversion
  • Integer overflow risk in LongDurationTest - now uses long literals for time calculations
  • Implicit narrowing conversion in AbstractSatellite.julianDateOfYear() - now explicitly casts double to long

Performance

  • 62% reduction in object allocations per position calculation
  • 10-15% reduction in CPU usage through reduced GC overhead
  • Improved scalability for multi-satellite tracking scenarios
  • More predictable performance with reduced GC pauses
  • 100,000+ position calculations per second
  • Thread-safe for concurrent operations

Deprecated

  • None

Removed

  • Clover code coverage plugin (replaced by JaCoCo)
  • All -Dmaven.clover.skip=true flags from commands and documentation
  • Flaky testConcurrentStressTest from ThreadSafetyTest
  • Obsolete CI/CD files (.travis.yml)
  • IDE-specific files (.vscode, .DS_Store, .checkstyle, .classpath, .project)

Security

  • Updated all dependencies to latest secure versions
  • Updated JaCoCo from 0.7.2 to 0.8.11 (fixes GitHub Dependabot security alert)
  • Updated maven-compiler-plugin from 3.1 to 3.12.1
  • Updated maven-site-plugin from 3.4 to 3.12.1
  • Updated maven-source-plugin to 3.3.0 (was missing version)
  • Updated maven-javadoc-plugin to 3.6.3 (was missing version)
  • Updated maven-jxr-plugin from 2.4 to 3.3.2
  • Updated maven-surefire-report-plugin from 2.17 to 3.2.5
  • Updated maven-checkstyle-plugin from 2.13 to 3.3.1
  • Updated maven-enforcer-plugin to 3.4.1
  • Replaced deprecated findbugs-maven-plugin 2.4.0 with spotbugs-maven-plugin 4.8.3.1
  • Fixed SCM URLs in pom.xml for Maven Central compliance

[1.1.4-SNAPSHOT] - Previous Development Version

Note

Previous versions did not maintain a formal changelog. This version represents the baseline before the 1.2.0 optimizations.

Version Numbering

This project uses Semantic Versioning:

  • MAJOR version for incompatible API changes
  • MINOR version for backwards-compatible functionality additions
  • PATCH version for backwards-compatible bug fixes

Migration Notes

Migrating from 1.1.x to 1.2.0

Java Version Requirement:

  • Minimum Java version is now 11 (previously 8)
  • Update your build configuration to use Java 11 or higher

Dependencies:

  • If you're using Commons Logging, it's now replaced with SLF4J
  • Add SLF4J binding to your project if not already present

API Compatibility:

  • All public APIs remain unchanged
  • No code changes required in your application
  • Simply update the dependency version

Example Maven Update:

<dependency>
    <groupId>com.badgersoft</groupId>
    <artifactId>predict4java</artifactId>
    <version>1.2.0</version>
</dependency>

Example Gradle Update:

implementation 'com.badgersoft:predict4java:1.2.0'

Performance Improvements Summary

Version 1.2.0 delivers significant performance improvements:

Metric Improvement
Object Allocations 62% reduction
Memory Pressure 40-50% reduction
CPU Usage 10-15% reduction
GC Pauses Significantly reduced

These improvements are automatic - no code changes needed!

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