java.lang.VerifyError: Expecting a stackmap frame

Question

Is there a way to load a custom HttpServlet to GAE? I uploaded a project that included an HttpServlet in the .server package and added it to the web.xml...

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Answer 1

GAE uses Java 1.6, but you've compiled the code with Java 1.7. You need to recompile with Java 1.6. As per the comments, you're using Eclipse; you can set the Java compiler level in Java > Compiler section of project's properties.

Answer 2

Using -XX:-UseSplitVerifier is a temporary solution. Now java uses the previous version of the bytecode verifier which tolerates this bad or missing stackmap frames. Java8 doesnt support this option.

Answer 3

As BalusC pointed out, one solution to the problem is to just use JDK6.

Another solution, if you want to stay with JDK7, would be to use "-XX:-UseSplitVerifier" as an argument for the VM. Go to

Window → Preferences → Java → Installed JREs → Edit... → Default VM arguments

and add it there.

Answer 4

I could solve this issue by setting Eclipse Mars / Project properties / Java compiler :

• Compiler compliance level to 1.7 (as I don't have 1.6 anymore)
• Generated .class files compatibility : 1.6
• Source compatibility : 1.6

as I didn't have 1.7 specific code :-)

Server Ubuntu + Tomcat 7.0.52 on JVM 1.7.0_85-b01 Dev Eclipse Mars on JDK 7u55