How to install the Appengine SDK to the Maven local repository?
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Note that this needs to be done only once.
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$ mvn gae:unpack
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Note that you don't need to manually download any SDK.
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How to generate the WAR?
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$ mvn package
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$ mvn war:war
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Note that this must be done before running the webapp locally and before
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deploying it to Appengine.
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How to run the webapp locally?
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$ mvn gae:run
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How to deploy the webapp to Appengine?
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$ mvn gae:update
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If you have made any changes to the code or pom.xml file of demo here,
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you may need to run Maven commands like ```mvn clean install -U```
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(especially one hierarchy above i.e at java/ folder) to resolve any
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dependency issues w.r.t new developement version.
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