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manolo / gwt-polymer-elements

Polymer Web Components for GWT. A collection of Material Design widgets for desktop and mobile.
Apache License 2.0
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Unable to deploy on GAE - App using vaadin-gwt-polymer-elements 1.7.0.0 #141

Closed aadhaarm closed 7 years ago

aadhaarm commented 7 years ago

I am trying to integrate vaadin-gwt-polymer-elements and upgrading my GWT app to GWT SDK 2.8. This works absolutely fine on local dev environment when I use Java 8 (jdk1.8.0_111) When I try to deploy the app on GAE, I get the following error:

Unable to update app: Class file is Java 8 but max supported is Java 7: com/vaadin/polymer/app/AppBoxElement.class in /Users/aadhaarmehrotra/git/rnlg-ims/RNLGPC/war/WEB-INF/lib/vaadin-gwt-polymer-elements-1.7.0.0.jar

Please suggest how this app can be deployed to appengine (using Eclipse GAE plugin). Thanks.

aadhaarm commented 7 years ago

Here is the fix for this issue. 'vaadin-gwt-polymer-elements-1.7.0.0.jar' DOES require Java 8 and Appengine doesn't support Java 8 so we can not upload 'vaadin-gwt-polymer-elements-1.7.0.0.jar' to appengine.

By removing it from /WEB-INF/lib and by adding 'vaadin-gwt-polymer-elements-1.7.0.0.jar' dependency as an external JAR, the application could compile successfully and the generated JS files are only uploaded to Appengine.

By satisfying both Appengine and the JAR requirements, this app can be deployed to Appengine!!