#isolation
Posts
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Digging into Tomcat's Source 4: Class Loaders — Each Web App Sees Its Own Classes
Why can two web apps in a single Tomcat process use different classes with the same name? We find the answer in the source — the common, server and shared loaders that Bootstrap builds from catalina.properties, the per-app WebappClassLoaderBase whose loadClass() turns parent delegation around, filter() which picks out exceptions such as jakarta.servlet, the delegate setting, and reloadable reloads with their thread-leak warnings — and check each one on a Tomcat built from the reference commit.