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I've been on a very old version of GAE for a long time. Every time I try to update to the latest version I get this error when deploying it to GCP:

java.lang.IllegalArgumentException: Class file is Java 8 but max supported is 
Java 7: org/eclipse/jetty/http/BadMessageException.class in C:\Users\XXXXXXXXXXX\
backendservlet\build\exploded-app\WEB-
INF\lib\jetty-http-9.3.2.v20150730.jar

I think jetty comes with GAE so how do I fix this? When I deploy it locally it runs without errors. It also builds without error. This only happens when deploying to GCP.

My appengine instance is on JAVA 7 runtime so maybe that's the issue? How do I change that? I tried deplying with a different version and name and it still didn't work.

Please help.

smashah
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2 Answers2

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Looks like jetty (or at least the version you're using) needs Java 8, which is not supported on GAE: Does Google App Engine support Java 8?.

Community
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Dan Cornilescu
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GAE does not yet support Java 8. If jetty is a dependency of your project, you need to use a version that has source 1.7. Otherwise delete C:\Users\XXXXXXXXXXX\ backendservlet\build\exploded-app\WEB- INF\lib\jetty-http-9.3.2.v20150730.jar

Ricardo Meneghin Filho
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