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# Debugging in Hosted Mode

You will spend most of your development time working in hosted mode, which means that you are interacting with your GWT application without it having been translated into JavaScript. Anytime you edit, run, and debug applications from a Java integrated development environment (IDE), you are working in hosted mode. When running in hosted mode, the Java Virtual Machine (JVM) is actually executing your application code as compiled Java bytecode, using GWT plumbing to automate an embedded browser window. By remaining in this traditional "code-test-debug" cycle, hosted mode is by far the most productive way to develop your application quickly.

To launch a hosted mode session, your startup class should be `com.google.gwt.dev.GWTShell`, found in `gwt-dev-windows.jar` (or `gwt-dev-linux.jar`).

Tip
In hosted mode, the GWT development shell looks for modules (and therefore client-side source) using the JVM's classpath. Make sure to add your source directories first in your classpath when running the development shell.