Claude
f27cca27e0
The controller was a static singleton: an eagerly created static instance opened the root database during class initialization, and both the connection and the path were static fields. A second operator profile in the same process was therefore impossible, and ChatController's own "new DBController()" never opened anything - it silently adopted the eagerly opened root connection. - drop the eager static instance in favour of a lazily created default instance - turn connection and path into instance state - add a constructor taking a database file name relative to the application directory plus a flag whether a missing file is seeded from the bundled template - create additional profile databases empty instead of seeding them: the bundled template carries 3452 foreign callsigns and user_version 0, which would show a new operator foreign data and trigger the full callsign normalization rebuild. The schema is created by the existing table setup. - remember the shutdown hook so closeDBConnection can deregister it; otherwise every profile switch would leave another hook holding a dead connection All SQL statements keep referencing the plain field and are unchanged. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Hpa6bjie5qkeNG62y6FmXm
KST4Contest
KST4Contest is a Java-based client for the ON4KST chat, developed for coordinated VHF, UHF and microwave contest operation.
The application is developed by Marc Fröhlich (DO5AMF) and since 2026 Philipp Wagner (DN9APW).
Start here
- Project website
- Download Stable, Beta and Nightly builds
- Online manual
- GitHub wiki
- Issues and bug reports
- Development roadmap
What KST4Contest does
KST4Contest combines the ON4KST chat with information that is useful when coordinating contacts during a contest.
Among other things, it can:
- display and filter stations from the supported ON4KST chat categories;
- derive band and frequency information from chat messages and station names;
- maintain Worked and NOT QRV information for the available bands;
- calculate station priorities from distance, activity and other available information;
- manage internal skeds and received Win-Test skeds;
- use AirScout information when evaluating possible aircraft-scatter contacts;
- display stations, paths and additional propagation information on maps;
- exchange information with supported logging programs, Win-Test, PSTRotator and a local DX Cluster interface;
- provide configurable automatic replies for recurring chat requests.
Calculated scores, aircraft-scatter information and path assessments are operating aids. They depend on the available data and should not be treated as guarantees that a contact is possible.
Installation
Ready-to-use packages are available for Windows, Linux and macOS. These packages include the required Java runtime, so a separate Java installation is normally not necessary.
Use the central download page to select the appropriate build:
- Stable is intended for normal contest operation.
- Beta contains changes that are being prepared for a stable release.
- Nightly contains the latest automated development build and is mainly intended for testing.
Documentation
The documentation is available in German and English:
The Markdown sources used for the wiki and the generated PDF manuals are stored in github_docs.
Changes to operating behaviour should be documented together with their purpose and limitations. This is especially important for functions whose result depends on external data, heuristics or information derived from chat messages.
Building from source
Building KST4Contest requires JDK 21. The Maven Wrapper included in the repository should be used, so a separate Maven installation is not required.
Linux and macOS:
./mvnw clean test
./mvnw -B -DskipTests compile
Windows:
mvnw.cmd clean test
mvnw.cmd -B -DskipTests compile
Repository structure
src/main/java/– application source codesrc/test/– automated testsgithub_docs/– German and English manual sourceswebsite/– project website sourcespackaging/– platform-specific packaging files
CI status
Documentation
Builds
License
KST4Contest is distributed under the GNU General Public License v3.0.