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Java Requirement Update for Web3Signer

Date: 2026-01-05
Reference: Web3Signer Installation Documentation


Important Discovery

According to the official Web3Signer documentation, Web3Signer requires Java 21 or later.

Our previous installation used Java 17 JRE, which is insufficient for Web3Signer 25.12.0.


Required Action

The Web3Signer container (VMID 107) needs Java 21 installed before Web3Signer can run properly.

Update Java Version

ssh root@192.168.11.11

# Install Java 21 in container 107
pct exec 107 -- bash -c 'apt-get update && apt-get install -y openjdk-21-jre-headless'

# Verify Java version
pct exec 107 -- java -version
# Should show: openjdk version "21.x.x"

Updated Installation Process

The installation script has been updated to include Java 21 installation. When you run the installation after downloading the Web3Signer binary, it will:

  1. Install Java 21 (if not already installed)
  2. Copy Web3Signer binary to container
  3. Extract and configure Web3Signer
  4. Start the service

Installation Steps (Updated)

  1. Download Web3Signer via browser (due to network SSL issues)
  2. Transfer to Proxmox host: scp web3signer-25.12.0.tar.gz root@192.168.11.11:/tmp/
  3. Run installation script:
    ssh root@192.168.11.11
    /tmp/web3signer-install-after-transfer.sh
    
    The script will automatically install Java 21 before installing Web3Signer.

Documentation Reference


Status

  • Installation script updated to include Java 21
  • Script deployed to Proxmox host
  • Waiting for Web3Signer binary download and transfer
  • Java 21 will be installed automatically during installation