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You need a Java 24+ JRE (or JDK) to run BuildABrowser. Download Azul Zulu OpenJDK. Ensure your PATH and JAVA_HOME environment variables are set.

Java 24:


java -Xms32m
				-XX:MaxHeapFreeRatio=10 -XX:MinHeapFreeRatio=10
				-XX:G1PeriodicGCInterval=1000 -XX:+G1PeriodicGCInvokesConcurrent
				-XX:+UnlockExperimentalVMOptions -XX:+UseCompactObjectHeaders
				-Djava.net.preferIPv4Stack=true -jar buildabrowser.jar

Java 25 (LTS):


java -Xms32m
				-XX:MaxHeapFreeRatio=10 -XX:MinHeapFreeRatio=10
				-XX:G1PeriodicGCInterval=1000 -XX:+G1PeriodicGCInvokesConcurrent
				-Djava.net.preferIPv4Stack=true -jar buildabrowser.jar

By default, BuildABrowser uses Skija (GPU-accelerated) for drawing. You can use Java2D by adding the --use-java2d flag, or use Skija in software-rendering mode via the --use-software-rendering flag.