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Error, GlassFish v3 Error 400 occurs when selects to open a deployed simple webapp from Applications menu Steps To Reproduce: 1. Install Netbean 6.1 RC build 2. Install Glassfish V3 plugin 3. Install Glassfish V3 Preview container 4. Create a test JSP Web Module (TestWebJSP) and deploy the war file to Glassfish V3 5. From Services tab > expand Servers > Glassfish V3 Preview > Application 6. Right-click at the TestWebJSP > select open in Browser
*** Issue 133061 has been marked as a duplicate of this issue. ***
This behavioral is caused by glassfish itself(try to deploy webapp manually), not by netbeans plugin. Download latest build from glassfish home pages - that already can deploy web projects ;)