Question

GAE remote API for java :Configuring Remote API on an App Engine Client

RemoteApiInsideAppEngineExample(String username, String password)
        throws IOException {
        // Authenticating with username and password is slow, so we'll do it
        // once during construction and then store the credentials for reuse.
        this.options = new RemoteApiOptions()
            .server("your_target_app_id.appspot.com", 443)
            .credentials(username, password);
        RemoteApiInstaller installer = new RemoteApiInstaller();
        installer.install(options);
        try {
            // Update the options with reusable credentials so we can skip
            // authentication on subsequent calls.
            options.reuseCredentials(username, installer.serializeCredentials());
        } finally {
            installer.uninstall();
        }
    }

In my test it always throw exception:

java.lang.IllegalArgumentException: charset may not be null or empty
    at com.google.appengine.repackaged.org.apache.commons.httpclient.util.EncodingUtil.getString(Unknown Source)
    at com.google.appengine.repackaged.org.apache.commons.httpclient.util.EncodingUtil.getString(Unknown Source)
    at com.google.appengine.tools.remoteapi.AppEngineClient$Response.getBodyAsString(AppEngineClient.java:138)
    at com.google.appengine.tools.remoteapi.RemoteApiInstaller.getAppIdFromServer(RemoteApiInstaller.java:318)
    at com.google.appengine.tools.remoteapi.RemoteApiInstaller.loginImpl(RemoteApiInstaller.java:278)
    at com.google.appengine.tools.remoteapi.RemoteApiInstaller.login(RemoteApiInstaller.java:239)
    at com.google.appengine.tools.remoteapi.RemoteApiInstaller.install(RemoteApiInstaller.java:106)

…..

I’m sure the username and password is admin one, I use GAE 1.7, Federated Login, High Replication Datastore.

Any ideas?
Thanks.

Answer 1

I think i found the answer, i use federated login, and currently GAE remote API does not support federated login—so bad that i spent much time on debugging.