gwt google app engine HTTP ERROR 404

[user414967 via StackOverflow]

I created a new gwt project with google application engine in eclipse. But when I run the project, in the browser I got the following message.

HTTP ERROR 404

Problem accessing /Test.html. Reason:

NOT_FOUND

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now it shows the following message.

HTTP ERROR: 503

Problem accessing /Test.html. Reason:

SERVICE_UNAVAILABLE

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What could be the problem? I did clean and build. But still the same problem.

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[skiller3 via StackOverflow]

I would recommend you check that:

a) The correct project directory is selected as your WAR in your eclipse project GWT settings. You can check your project GWT settings by right-clicking on the project, selecting Properties, and then clicking on Google in the left-hand list (the Google item will have sub-items; the WAR should be specified in one of them).

b) The URL following the -startupUrl option in your run/debug configuration is correct if it exists (if it doesn't exist then you should add it). The argument can be inserted into the "Program arguments" text field in the "Arguments" tab.

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[wzbozon via StackOverflow]

I encountered this problem, when my project facet had Java 1.8 version, GAE needs Java 1.7. You can change it by right clicking java and selecting "change version" here:

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