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PODropbox Java API with GWT Authentication problems
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copied!<p>I am using version 1.6 of the Dropbox API for Java found here: <a href="https://www.dropbox.com/developers/core/sdks/java" rel="nofollow">https://www.dropbox.com/developers/core/sdks/java</a></p> <p>I am also using GWT 2.5.1 in Eclipse 3.7</p> <p>I have the following code which works when run as a Java Applcation:</p> <pre><code> DbxRequestConfig requestConfig = new DbxRequestConfig(type, locale); DbxAppInfo appInfo = new DbxAppInfo(APP_ID, APP_SECRET); DbxWebAuthNoRedirect webauth = new DbxWebAuthNoRedirect(requestConfig, appInfo); String result = webauth.start(); System.out.println(result); BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String code = reader.readLine(); webauth = new DbxWebAuthNoRedirect(requestConfig, appInfo); DbxAuthFinish finish = webauth.finish(code); DbxClient client = new DbxClient(requestConfig, finish.accessToken); DbxAccountInfo info = client.getAccountInfo(); long total = info.quota.total; long used = info.quota.normal; System.out.println("total: " + total); System.out.println("used: " + used); </code></pre> <p>This works just fin when I run it as a Java Application. However, when I try to do something similar with GWT within a RemoteServiceServlet. I get an exception when I try to do </p> <pre><code>webauth = new DbxWebAuthNoRedirect(requestConfig, appInfo); </code></pre> <p>The exception I am getting is the following:</p> <pre><code>Caused by: java.lang.ClassCastException: com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection cannot be cast to javax.net.ssl.HttpsURLConnection at com.dropbox.core.http.StandardHttpRequestor.prepRequest(StandardHttpRequestor.java:160) at com.dropbox.core.http.StandardHttpRequestor.startPost(StandardHttpRequestor.java:87) at com.dropbox.core.http.StandardHttpRequestor.startPost(StandardHttpRequestor.java:21) at com.dropbox.core.DbxRequestUtil.startPostNoAuth(DbxRequestUtil.java:156) at com.dropbox.core.DbxRequestUtil.doPostNoAuth(DbxRequestUtil.java:289) at com.dropbox.core.DbxWebAuthHelper.finish(DbxWebAuthHelper.java:40) at com.dropbox.core.DbxWebAuthNoRedirect.finish(DbxWebAuthNoRedirect.java:84) at com.cloudshare.server.DropboxPlayground.getFinish(DropboxPlayground.java:21) at com.cloudshare.server.DropboxServiceImpl.authenticate(DropboxServiceImpl.java:70) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:115) at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:561) ... 40 more </code></pre> <p>I have been banging my head against a wall for last couple of hours trying to figure out what is going on. I originally wanted to use a DbxWebAuth but the documentation in their API includes instructions that have classes that don't exist (I am assuming they did at one time).</p> <p>I feel like the DbxWebAuthNoRedirect is doing something where it is dynamically loading a connection based on the classes that are available. But I have not been able to figure it out.</p> <p>Thanks in advance for the help!</p> <p>EDITS:</p> <p>Okay, so I looked at the Dropbox API source and the error is occurring here:</p> <pre><code> URL urlObject = new URL(url); HttpsURLConnection conn = (HttpsURLConnection) urlObject.openConnection(this.proxy); </code></pre> <p>Because I am using Google App Engine, it is using its own URL object rather than the one imported by the App Engine API. Any ideas on a solution that doesn't involve writting a GWT wrapper for the Dropbox API.</p>

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