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For nearly every web-application you need a database to store your information. Usually you’d use a relational database like Postgresql or MySQL and a mapper like Hibernate to access it in your code. And here comes the problem:

Googles doesn’t offer you a relational database but their own database-system called BigTable which you can’t access with the usual Hibernate-Mapping. And one more thing: Google doesn’t call it a database but a datastore

In this example I’d like to show you, how to save, get, update and delete an object.

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For nearly every web-application you need a database to store your information. Usually you'd use a relational database like Postgresql or MySQL and a mapper like Hibernate to access it in your code. And here comes the problem: Googles doesn't offer you a relational database but their own database-system called BigTable which you can't access ...

After deploying the first web-app to GAE, we now want to try to run a tapestry based application.

One problem I faced, resulted from google’s JRE Class whitelist, which lists all classes, you can use in your application. The current stable release of Tapestry uses a blacklisted XML Parser.

Therefore you have two possibilities:

• Replace the XML-Parser
• or just use Tapestry 5.2

I decided to update my downloaded Tapestry Libs to 5.2.

Create a project

First we have to create a new Tapestry-app with Maven. I used the integrated support of Netbeans to achieve this. In apache’s maven repository you can find a quickstart-app for Tapestry 5.2, which is ideal for testing purpose.

Now you only have to add a appengine-web.xml file and that’s it…

After deploying the first web-app to GAE, we now want to try to run a tapestry based application. One problem I faced, resulted from google's JRE Class whitelist, which lists all classes, you can use in your application. The current stable release of Tapestry uses a blacklisted XML Parser. Therefore you have two possibilities: Replace the XML-Parser or ...