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POWhich classes can be used in GWT app deployed to Google App Enginge?
 

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  1. POWhich classes can be used in GWT app deployed to Google App Enginge?
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    <p>I'm writing an app with GWT, which I want to deploy to Google App Engine. I want to use some classes from JRE, like <code>java.io.BufferedReader;</code> <code>java.net.URL</code> <code>javax.crypto.Cipher</code> <code>java.util.zip.InflaterInputStream</code>, which are listed on <code>JRE Class White List</code> - <a href="https://developers.google.com/appengine/docs/java/jrewhitelist" rel="nofollow">https://developers.google.com/appengine/docs/java/jrewhitelist</a></p> <p>I'm using eclipse and when I'm trying to run my app locally compiler throws me errors like <code>[ERROR] [gwtlist] - Line 46: No source code is available for type java.net.URL; did you forget to inherit a required module?</code>.</p> <p>In <code>Google App Engine General Questions</code> - <a href="https://developers.google.com/appengine/kb/general#language" rel="nofollow">https://developers.google.com/appengine/kb/general#language</a> it's said: <code>...Also, Java-based applications may only use the JRE classes in the JRE class white list.</code></p> <p>My question is if am I thinking wright or wrong? Is this <code>JRE Class White List</code> can be used on client side, or maybe it is only useful for server side code? In this case I don't need to use Google App Engine, 'cause all the client code has to be written only in pure <code>GWT</code> with some java classes from <code>JRE Emulation Reference</code> - <a href="https://developers.google.com/web-toolkit/doc/latest/RefJreEmulation?hl=es-419#Package_java_io" rel="nofollow">https://developers.google.com/web-toolkit/doc/latest/RefJreEmulation?hl=es-419#Package_java_io</a>. In this case what is the goal of Google App Engine? Is it only to emulate server?</p> <p>Edit: In case when Google App Engine can only emulate JRE classes on server side, could you tell me where exactly app is running. I mean situation as:</p> <p>App is deployed on Google App Engine.<br>Client runs app and loggs in.<br>Server side code opens external file on other server, decompress it and sends the result to a client side.</p> <p>My question is how the <code>transfer</code> is working? Is it everything inside Google cloud, or do client has to download e.g. this uncompressed file?``</p>
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