Language: Deutsch · English

Launcher (EN)

The Nuclos Launcher starts the Rich Client without Java Web Start – how to enable, install and configure it.

HOW-TO USER UPDATED: JUL 2026 APPLIES TO NUCLOS 4.2026.X

On this page

What the Launcher does

The Launcher downloads a server-side packaged Rich Client and starts it – independent of Java Web Start. It must be enabled twice: in the server configuration and as an install on the client.

1. Server configuration

Enable the Launcher option in the installer's last step. The server then builds a complete packaged desktop client for the Launcher to download and start.

Enable the Launcher option in the installer.

2. Client installation

The Launcher is installed on the client as its own application – installer for Windows, standalone packages for Linux/macOS. The "full" variants bundle their own JRE.

The Nuclos Launcher with added instances.

nuclos:// protocol

On supported platforms the nuclos:// protocol is registered. Instance links look like nuclos://<hostname>:<port>/<instance> (port 80 may be omitted).

JRE selection

The Launcher picks the Java runtime in this order:

Java from the server
Java defined in the Launcher
Java found on the system

Place custom runtimes under <install-dir>/data/launcher/ (a ZIP containing a JRE/JDK), e.g. jre-windows-x64bit.zip.

Custom SSL certificates

For servers with a custom/invalid certificate, give the Launcher a TrustStore: a file named cacerts in its install directory (default password changeit).