ZAP Proxy is a penetration testing tool to test vulnerabilities in Web applications. It is written in Java, but doesn't work right away if you're using Mac OS X Snow Leopard, instead crashing ungracefully upon launch. The culprit? the Java version that comes bundled with it, 1.7.0_75. Here, and helped by ZAP's friendly IRC service, I describe how to properly execute ZAP 2.4.0. Luckily, the code is supposed to be compatible with previous JRE versions.