diff --git a/.aider.conf.yml b/.aider.conf.yml
new file mode 100644
index 00000000..650aa3ab
--- /dev/null
+++ b/.aider.conf.yml
@@ -0,0 +1,462 @@
+##########################################################
+# Sample .aider.conf.yml
+# This file lists *all* the valid configuration entries.
+# Place in your home dir, or at the root of your git repo.
+##########################################################
+
+# Note: You can only put OpenAI and Anthropic API keys in the yaml
+# config file. Keys for all APIs can be stored in a .env file
+# https://aider.chat/docs/config/dotenv.html
+
+##########
+# options:
+
+## show this help message and exit
+#help: xxx
+
+#############
+# Main model:
+
+## Specify the model to use for the main chat
+model:  gemini-2.5-pro
+
+########################
+# API Keys and settings:
+
+## Specify the OpenAI API key
+#openai-api-key: xxx
+
+## Specify the Anthropic API key
+#anthropic-api-key: xxx
+
+## Specify the api base url
+#openai-api-base: xxx
+
+## (deprecated, use --set-env OPENAI_API_TYPE=<value>)
+#openai-api-type: xxx
+
+## (deprecated, use --set-env OPENAI_API_VERSION=<value>)
+#openai-api-version: xxx
+
+## (deprecated, use --set-env OPENAI_API_DEPLOYMENT_ID=<value>)
+#openai-api-deployment-id: xxx
+
+## (deprecated, use --set-env OPENAI_ORGANIZATION=<value>)
+#openai-organization-id: xxx
+
+## Set an environment variable (to control API settings, can be used multiple times)
+#set-env: xxx
+## Specify multiple values like this:
+#set-env:
+#  - xxx
+#  - yyy
+#  - zzz
+
+## Set an API key for a provider (eg: --api-key provider=<key> sets PROVIDER_API_KEY=<key>)
+#api-key: xxx
+## Specify multiple values like this:
+#api-key:
+#  - xxx
+#  - yyy
+#  - zzz
+
+#################
+# Model settings:
+
+## List known models which match the (partial) MODEL name
+#list-models: xxx
+
+## Specify a file with aider model settings for unknown models
+#model-settings-file: .aider.model.settings.yml
+
+## Specify a file with context window and costs for unknown models
+#model-metadata-file: .aider.model.metadata.json
+
+## Add a model alias (can be used multiple times)
+#alias: xxx
+## Specify multiple values like this:
+#alias:
+#  - xxx
+#  - yyy
+#  - zzz
+
+## Set the reasoning_effort API parameter (default: not set)
+## depends on the concrete model if and how this is supported
+reasoning-effort: high
+
+## Set the thinking token budget for models that support it (default: not set)
+## depends on the concrete model if and how this is supported
+#thinking-tokens: xxx
+
+## Verify the SSL cert when connecting to models (default: True)
+#verify-ssl: true
+
+## Timeout in seconds for API calls (default: None)
+#timeout: xxx
+
+## Specify what edit format the LLM should use (default depends on model)
+#edit-format: xxx
+
+## Use architect edit format for the main chat
+#architect: false
+
+## Enable/disable automatic acceptance of architect changes (default: True)
+#auto-accept-architect: true
+
+## Specify the model to use for commit messages and chat history summarization (default depends on --model)
+#weak-model: xxx
+
+## Specify the model to use for editor tasks (default depends on --model)
+#editor-model: xxx
+
+## Specify the edit format for the editor model (default: depends on editor model)
+#editor-edit-format: xxx
+
+## Only work with models that have meta-data available (default: True)
+#show-model-warnings: true
+
+## Check if model accepts settings like reasoning_effort/thinking_tokens (default: True)
+#check-model-accepts-settings: true
+
+## Soft limit on tokens for chat history, after which summarization begins. If unspecified, defaults to the model's max_chat_history_tokens.
+#max-chat-history-tokens: xxx
+
+#################
+# Cache settings:
+
+## Enable caching of prompts (default: False)
+#cache-prompts: false
+
+## Number of times to ping at 5min intervals to keep prompt cache warm (default: 0)
+#cache-keepalive-pings: false
+
+###################
+# Repomap settings:
+
+## Suggested number of tokens to use for repo map, use 0 to disable
+#map-tokens: xxx
+
+## Control how often the repo map is refreshed. Options: auto, always, files, manual (default: auto)
+#map-refresh: auto
+
+## Multiplier for map tokens when no files are specified (default: 2)
+#map-multiplier-no-files: true
+
+################
+# History Files:
+
+## Specify the chat input history file (default: .aider.input.history)
+#input-history-file: .aider.input.history
+
+## Specify the chat history file (default: .aider.chat.history.md)
+#chat-history-file: .aider.chat.history.md
+
+## Restore the previous chat history messages (default: False)
+#restore-chat-history: false
+
+## Log the conversation with the LLM to this file (for example, .aider.llm.history)
+#llm-history-file: xxx
+
+##################
+# Output settings:
+
+## Use colors suitable for a dark terminal background (default: False)
+#dark-mode: false
+
+## Use colors suitable for a light terminal background (default: False)
+#light-mode: false
+
+## Enable/disable pretty, colorized output (default: True)
+#pretty: true
+
+## Enable/disable streaming responses (default: True)
+#stream: true
+
+## Set the color for user input (default: #00cc00)
+#user-input-color: "#00cc00"
+
+## Set the color for tool output (default: None)
+#tool-output-color: "xxx"
+
+## Set the color for tool error messages (default: #FF2222)
+#tool-error-color: "#FF2222"
+
+## Set the color for tool warning messages (default: #FFA500)
+#tool-warning-color: "#FFA500"
+
+## Set the color for assistant output (default: #0088ff)
+#assistant-output-color: "#0088ff"
+
+## Set the color for the completion menu (default: terminal's default text color)
+#completion-menu-color: "xxx"
+
+## Set the background color for the completion menu (default: terminal's default background color)
+#completion-menu-bg-color: "xxx"
+
+## Set the color for the current item in the completion menu (default: terminal's default background color)
+#completion-menu-current-color: "xxx"
+
+## Set the background color for the current item in the completion menu (default: terminal's default text color)
+#completion-menu-current-bg-color: "xxx"
+
+## Set the markdown code theme (default: default, other options include monokai, solarized-dark, solarized-light, or a Pygments builtin style, see https://pygments.org/styles for available themes)
+#code-theme: default
+
+## Show diffs when committing changes (default: False)
+#show-diffs: false
+
+###############
+# Git settings:
+
+## Enable/disable looking for a git repo (default: True)
+#git: true
+
+## Enable/disable adding .aider* to .gitignore (default: True)
+#gitignore: true
+
+## Specify the aider ignore file (default: .aiderignore in git root)
+#aiderignore: .aiderignore
+
+## Only consider files in the current subtree of the git repository
+#subtree-only: false
+
+## Enable/disable auto commit of LLM changes (default: True)
+auto-commits: false
+
+## Enable/disable commits when repo is found dirty (default: True)
+#dirty-commits: true
+
+## Attribute aider code changes in the git author name (default: True)
+#attribute-author: true
+
+## Attribute aider commits in the git committer name (default: True)
+#attribute-committer: true
+
+## Prefix commit messages with 'aider: ' if aider authored the changes (default: False)
+#attribute-commit-message-author: false
+
+## Prefix all commit messages with 'aider: ' (default: False)
+#attribute-commit-message-committer: false
+
+## Enable/disable git pre-commit hooks with --no-verify (default: False)
+#git-commit-verify: false
+
+## Commit all pending changes with a suitable commit message, then exit
+#commit: false
+
+## Specify a custom prompt for generating commit messages
+#commit-prompt: xxx
+
+## Perform a dry run without modifying files (default: False)
+#dry-run: false
+
+## Skip the sanity check for the git repository (default: False)
+#skip-sanity-check-repo: false
+
+## Enable/disable watching files for ai coding comments (default: False)
+#watch-files: false
+
+########################
+# Fixing and committing:
+
+## Lint and fix provided files, or dirty files if none provided
+lint: false
+
+## Specify lint commands to run for different languages, eg: "python: flake8 --select=..." (can be used multiple times)
+# lint-cmd: gw-spotless # won't work because aider does not support bash aliases
+## Specify multiple values like this:
+#lint-cmd:
+#  - xxx
+#  - yyy
+#  - zzz
+
+## Enable/disable automatic linting after changes (default: True)
+#auto-lint: true
+
+## Specify command to run tests
+#test-cmd: xxx
+
+## Enable/disable automatic testing after changes (default: False)
+#auto-test: false
+
+## Run tests, fix problems found and then exit
+#test: false
+
+############
+# Analytics:
+
+## Enable/disable analytics for current session (default: random)
+#analytics: xxx
+
+## Specify a file to log analytics events
+#analytics-log: xxx
+
+## Permanently disable analytics
+#analytics-disable: false
+
+############
+# Upgrading:
+
+## Check for updates and return status in the exit code
+#just-check-update: false
+
+## Check for new aider versions on launch
+#check-update: true
+
+## Show release notes on first run of new version (default: None, ask user)
+#show-release-notes: xxx
+
+## Install the latest version from the main branch
+#install-main-branch: false
+
+## Upgrade aider to the latest version from PyPI
+#upgrade: false
+
+## Show the version number and exit
+#version: xxx
+
+########
+# Modes:
+
+## Specify a single message to send the LLM, process reply then exit (disables chat mode)
+#message: xxx
+
+## Specify a file containing the message to send the LLM, process reply, then exit (disables chat mode)
+#message-file: xxx
+
+## Run aider in your browser (default: False)
+#gui: false
+
+## Enable automatic copy/paste of chat between aider and web UI (default: False)
+#copy-paste: false
+
+## Apply the changes from the given file instead of running the chat (debug)
+#apply: xxx
+
+## Apply clipboard contents as edits using the main model's editor format
+#apply-clipboard-edits: false
+
+## Do all startup activities then exit before accepting user input (debug)
+#exit: false
+
+## Print the repo map and exit (debug)
+#show-repo-map: false
+
+## Print the system prompts and exit (debug)
+#show-prompts: false
+
+#################
+# Voice settings:
+
+## Audio format for voice recording (default: wav). webm and mp3 require ffmpeg
+#voice-format: wav
+
+## Specify the language for voice using ISO 639-1 code (default: auto)
+#voice-language: en
+
+## Specify the input device name for voice recording
+#voice-input-device: xxx
+
+#################
+# Other settings:
+
+## specify a file to edit (can be used multiple times)
+#file: xxx
+## Specify multiple values like this:
+#file:
+#  - xxx
+#  - yyy
+#  - zzz
+
+## specify a read-only file (can be used multiple times)
+read: CONVENTIONS.md
+
+## Specify multiple values like this:
+# read:
+#  - CONVENTIONS.md
+#  - ...
+#  - ...
+
+## Use VI editing mode in the terminal (default: False)
+#vim: false
+
+## Specify the language to use in the chat (default: None, uses system settings)
+#chat-language: xxx
+
+## Always say yes to every confirmation
+#yes-always: false
+
+## Enable verbose output
+#verbose: false
+
+## Load and execute /commands from a file on launch
+#load: xxx
+
+## Specify the encoding for input and output (default: utf-8)
+#encoding: utf-8
+
+## Line endings to use when writing files (default: platform)
+#line-endings: platform
+
+## Specify the config file (default: search for .aider.conf.yml in git root, cwd or home directory)
+#config: xxx
+
+## Specify the .env file to load (default: .env in git root)
+#env-file: .env
+
+## Enable/disable suggesting shell commands (default: True)
+#suggest-shell-commands: true
+
+## Enable/disable fancy input with history and completion (default: True)
+#fancy-input: true
+
+## Enable/disable multi-line input mode with Meta-Enter to submit (default: False)
+#multiline: false
+
+## Enable/disable terminal bell notifications when LLM responses are ready (default: False)
+#notifications: false
+
+## Specify a command to run for notifications instead of the terminal bell. If not specified, a default command for your OS may be used.
+#notifications-command: xxx
+
+## Enable/disable detection and offering to add URLs to chat (default: True)
+#detect-urls: true
+
+## Specify which editor to use for the /editor command
+#editor: xxx
+
+############################
+# Deprecated model settings:
+
+## Use claude-3-opus-20240229 model for the main chat (deprecated, use --model)
+#opus: false
+
+## Use anthropic/claude-3-7-sonnet-20250219 model for the main chat (deprecated, use --model)
+#sonnet: false
+
+## Use claude-3-5-haiku-20241022 model for the main chat (deprecated, use --model)
+#haiku: false
+
+## Use gpt-4-0613 model for the main chat (deprecated, use --model)
+#4: false
+
+## Use gpt-4o model for the main chat (deprecated, use --model)
+#4o: false
+
+## Use gpt-4o-mini model for the main chat (deprecated, use --model)
+#mini: false
+
+## Use gpt-4-1106-preview model for the main chat (deprecated, use --model)
+#4-turbo: false
+
+## Use gpt-3.5-turbo model for the main chat (deprecated, use --model)
+#35turbo: false
+
+## Use deepseek/deepseek-chat model for the main chat (deprecated, use --model)
+#deepseek: false
+
+## Use o1-mini model for the main chat (deprecated, use --model)
+#o1-mini: false
+
+## Use o1-preview model for the main chat (deprecated, use --model)
+#o1-preview: false
diff --git a/.gitignore b/.gitignore
index bd8ec3fe..8f9613a5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -142,3 +142,8 @@ Desktop.ini
 ######################
 /.environment*
 /src/test/resources/migration-prod/*
+.aider/
+.aider.tags.cache.*
+.aider.chat.history.md
+.aider.input.history
+.cache
diff --git a/CONVENTIONS.md b/CONVENTIONS.md
new file mode 100644
index 00000000..18ab2d1b
--- /dev/null
+++ b/CONVENTIONS.md
@@ -0,0 +1,111 @@
+# Code Generting Conventions
+
+This document outlines the coding conventions for this project to be used by any AI agent.
+Ask the user to add these files to the AI agent before generating anything.
+
+## Initially
+
+At the beginning of each code generation session, determine all files which are not yet added, but might need to be changed and new files which might need to be created.
+
+Consider:
+- related Java-classes (*.java), including test classes
+- also Java-classes files in the same package as the mainly related class, e.g. patcher
+- related liquibase changesets (*.sql)
+- related openapi specs (*.yaml)
+- related i18n files (*.properties)
+
+Make sure production code and test code stay in sync,
+a change in one usually means the other has also to be changed.
+
+## Java Conventions (`*.java` files)
+
+### General Rules for Java Files
+
+These rules apply to all `.java` files in `src/**/*.java` but not those located in `**/generated/**`, `build/**`, or `.gradle/**` directories.
+
+1.  **Imports**: No wildcard imports. Unused imports must be removed.
+2.  **Indentation**: Use 4 spaces for indentation. Do not use tabs.
+3.  **End of File**: All files must end with a newline character.
+4.  **Formatting Control**: Spotless formatting can be temporarily disabled for specific code blocks using comments:
+    ```java
+    // spotless:off
+    // ... code that should not be formatted ...
+    // spotless:on
+    ```
+*   Follow existing code style and patterns within the project.
+    - Avoid reassigning variables and use `final var` where possible.
+    - Use `final` for method parameters.
+*   Use meaningful names for variables, methods, and classes.
+*   Write clear and concise comments where necessary to explain complex logic or intent.
+
+### toString via Stringify
+
+For assertions, keep in mind, that the Stringify implementation of the toString method skips null values. Thus, do not add null values in assertions if a Stringify-based toString implementation is tested!
+
+
+## PostgreSQL Conventions (`*.sql` files)
+
+Do only Liquibase changesets if they got created in the same branch.
+
+If they already exist in the master branch, generate a new Liquibase changeset.
+
+Add new Liquibase changesets to existing files where they belong,
+e.g. add a changeset with an ALTER TABLE directly after the related CREATE TABLE changeset. 
+
+If creating a new Liquibase changeset, there is no need to check if the change already exists, Liquibase will check that.
+
+## i18n Conventions (`*.properties` files)
+
+Use the English translation as the key in the `messages_*.properties` file,
+'=' and ' ' need to be quoted.
+
+## YAML Conventions (*.yaml files)
+
+Always use exactly 4 spaces for indentation.
+
+## General Conventions
+
+### general strategy
+
+At the beginning of each task, always determine all files which might need to be changed and new files which might need to be created. 
+
+### adding/deleting/amending fields/properties
+
+If a field in a database table is added, deleted or amended, the following steps must be taken:
+
+- The property must be added to the Java class on which the entity/entities are based; it must also be included in the toString method. Also amend the related unit test.
+
+- If the related entity has a patcher class, also add the new property to the patcher (usually ending with EntityPatcher) and its unit test (usually ending with EntityPatcherUnitTest).
+
+- The property must be included in (potentially 3) JSON resources (POST, GET, PATCH) in the OpenAPI specification.
+
+- The property must be added to the SQL table, so either enforce it via Liquibase or create a new Liquibase changeset.
+
+- The property must be included in the restricted view, which must be dropped and recreated due to the structural change; this view is generated by a stored procedure from the RBAC system.
+
+- The property must be added to the RBAC update trigger; for this, the RBAC DSL, the static method rbac() in the entity class(es), must be adjusted. The generator should automatically force Liquibase to reapply the changeset.
+
+- The tests may need to be adjusted; the new field should also be tested in an integration test for POST, GET, and PATCH.
+
+## While Generating CHanges
+
+Check all added files, if they need to be changed for the new feature.
+Most likely, all added files need some sort of change.
+
+Make sure production code and test code stay in sync,
+a change in one usually means the other has also to be changed.
+
+## Executing Commands
+
+### Generating from OpenAPI
+
+If OpenAPI specs (*.yaml) got changed, `gw openApiGenerate` needs to be executed.
+
+### Generating from RBAC DSL
+
+If any RBAC spec of an entity has changed, the static rbac() method in an entity class, `gw rbacGenerate` has to be executed before any test can run.
+
+### Test Execution
+
+Use the alias `gw-test` to run the tests with a proper environment.
+Do not suggest to run `./gradlew test`, it won't work without a correect environment.
diff --git a/README.md b/README.md
index 1997dcf9..162885ce 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 # hsadminNg Development
 
+(The origin repository for this project can be found at [Hostsharing eG](https://git.hostsharing.net/hostsharing/hs.hsadmin.ng).)
+
 This documents gives an overview of the development environment and tools.
 For architecture consider the files in the `doc` and `adr` folder.
 
@@ -361,6 +363,9 @@ You can explore the prototype as follows:
 ### Directory and Package Structure
 
 #### General Directory Structure
+ 
+`.aider.conf.yml`
+    Configuration for the _aider AI_ coding agent.
 
 `.aliases`
     Shell-aliases for common tasks.
@@ -371,6 +376,9 @@ You can explore the prototype as follows:
 `build.gradle.kts`
     Gradle build-file (Kotlin-Script). Contains dependencies and build configurations.
 
+`CONVENTIONS.md`
+    Coding conventions for use by an AI agent.
+
 `doc/`
     Contains project documentation.
 
@@ -932,6 +940,126 @@ BEGIN
 END $$;
 ```
 
+### How to Use _aider AI_ - Pair Programming in Your Terminal
+
+[aider](https://aider.chat/) is an [open source](https://github.com/Aider-AI/aider) AI agent in the shape of a command-line tool that lets you code with large language models (LLMs) OpenAI GPT, Claude Sonnet or Google Gemini.
+It allows you to easily analyze and edit files by chatting with the AI.
+
+*BEWARE*: aider is going to send your source code to the LLM!
+
+_hsadmin-NG_ is open source, so this is not a big problem.
+For more information about security regarding aider, please have a look at the end of this chapter and check out [the aider privacy policy](https://aider.chat/docs/legal/privacy.html).
+
+#### Installation
+
+Assuming you have Python 3 and `pipx` installed (a tool to install and run Python applications in isolated environments), you can install `aider-chat` like this:
+
+```shell
+pipx install aider-chat
+```
+
+If you want to use specific features like OpenAI's vision capabilities, you might need to add the following dependencies:
+
+```shell
+pipx inject aider-chat openai --include-apps
+```
+
+To add support for Google's Gemini AI, you can add the `google-generativeai` package:
+
+```shell
+pipx inject aider-chat google-generativeai --include-apps
+```
+
+#### Configuration
+
+`aider` requires an API key for the AI model you want to use.
+
+E.g. for _OpenAI GPT_, set the `OPENAI_API_KEY` environment variable:
+
+```shell
+export OPENAI_API_KEY="your-api-key-here"
+```
+
+And e.g. for _Google Gemini_, set the `GEMINI_API_KEY` environment variable:
+
+```shell
+export GEMINI_API_KEY="your-api-key-here"
+```
+
+You might want to add this to your shell's startup file (e.g., `.bashrc`, `.zshrc`).
+
+#### Usage
+
+1.  Navigate to your project's root directory in the terminal.
+2.  Start `aider` by simply typing:
+    ```shell
+    aider # see also .aider.conf.yml
+    ```
+3.  Add the files you want the AI to work with:
+    ```
+    /add path/to/your/file.java path/to/another/file.py
+    ```
+4.  Start chatting! Describe the changes you want, ask questions, or request code generation. `aider` will propose changes and apply them directly to your files after your confirmation.
+5.  Use `/quit` to exit `aider`.
+
+Refer to the [official aider documentation](https://aider.chat/docs/usage.html) for more commands and advanced features.
+
+#### Example Session
+
+Aider is not yet very good at figuring out which files to amend in a large code base.
+I tried giving hints with `/ask`, but it was always missing too many files.
+With some of my approaches, it even wanted to create new files, which is not necessary for this task. 
+
+I even tried with other language models, like gpt-o4 or r1 (deepseek-reasoning), no success.
+Maybe somebody else can figure it out, or it gets better with time?
+
+For now, I just determined the files myself.
+As I knew that the new filed needs to be supported everywhere, 
+where the existing field `registrationOffice` occurs, I could simply use grep:  
+
+```shell
+    aider `grep -rl registrationOffice src/main/java/ src/test/java/ src/main/resources/api-definition src/main/resources/db/`
+```
+
+Then I requested my change to the _aider AI_ chat:
+
+> I want to add a text field `notes` to the database table `hs_office.partner_details` and related files.
+  Files to amend have already been added to aider AI.
+  Please apply all required changes for Java production+test-code,
+  add the Liquibase changeset and amend the OpenAPI-Spec. 
+
+I ran the tests and found that patching the partner details did not work.
+So, I told the _aider AI_ about it:
+
+> Please doublecheck if you followed all conventions.
+  Any other amendments necessary to support the new field `notes` in the partner details?   
+
+Then I saw, that _aider AI_ did add some notes to the test data, but not to the assertions.
+I decided that the changes in the test-data are not necessary and reverted thos files using git.
+
+Now, all tests passed.
+
+Try it yourself, but keep in mind that LLMs use a concept called _temperature_ which specifies a level of randomness.
+This means, you might get different results.
+
+#### Security
+
+To reassure myself which files _aider AI_ accesses, I checked this with `strace`:
+
+```
+# run aider under strace: 
+strace -f -t -e trace=file -o build/aider.strace aider ...
+
+# and in another terminal check the strace log:
+tail -f build/aider.strace | grep -oP '"\K[^\n"]+(?=")' 
+```
+
+At the time I've checked it, all accessed files made sense.
+Of course, as with any locally installed application, there is no guarantee.
+
+There is a _Docker_ image for _aider AI_, but it's pretty restriced
+and to be able to use some features, you'd need to rebuild the image.
+
 
 ## Further Documentation
 
diff --git a/build.gradle.kts b/build.gradle.kts
index 33500bcc..4f219c57 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -71,9 +71,11 @@ repositories {
     maven { url = uri("https://repo.spring.io/milestone") }
 }
 
+val JAVA_VERSION = 21
+
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(21))
+        languageVersion.set(JavaLanguageVersion.of(JAVA_VERSION))
         vendor.set(JvmVendorSpec.ADOPTIUM)
         implementation.set(JvmImplementation.VENDOR_SPECIFIC)
     }
@@ -623,6 +625,20 @@ tasks.register("convertMarkdownToHtml") {
     dependsOn(tasks.named("scenarioTest"))
 }
 
+// HOWTO re-generate the RBAC rules (PostgreSQL code) from the RBAC specs in the entities rbac()-method
+//  in a shell run `gw rbacGenerate`
+tasks.register<JavaExec>("rbacGenerate") {
+    group = "application"
+    mainClass.set("net.hostsharing.hsadminng.rbac.generator.RbacSpec")
+    classpath = sourceSets["main"].runtimeClasspath
+
+    // This ensures the task uses the Java version from the defined toolchain.
+    javaLauncher.set(javaToolchains.launcherFor {
+        languageVersion.set(JavaLanguageVersion.of(JAVA_VERSION))
+        vendor.set(JvmVendorSpec.ADOPTIUM)
+        implementation.set(JvmImplementation.VENDOR_SPECIFIC)
+    })
+}
 
 // shortcut for compiling all files
 tasks.register("compile") {