sudo apt update sudo apt install openjdk-17-jre-headless # For headless servers sudo apt install openjdk-17-jre # Full desktop support
grant codeBase "file:/app/*" permission java.io.FilePermission "/var/log/*", "read,write"; ; Create custom JREs containing only required modules: java runtime environment linux
java -version # Should show: "Headless" or absence of AWT exceptions 6.1 JRE Vulnerabilities and Patching Linux distributions provide security updates via system package managers. Always use a supported LTS version (e.g., OpenJDK 17, 21). Monitor CVE databases (NVD, Red Hat Security). 6.2 Security Manager and Policy Files Although deprecated in Java 17+ (removed in Java 21), legacy systems can restrict permissions via java.policy : sudo apt update sudo apt install openjdk-17-jre-headless #