HttpURLConnection.getResponseCode() alway return null pointer exception.

[Tran Quoc Anh]

Hi, when I try to call getResponseCode method (or connect(),..), it's causes null pointer exception. Here's my code:

  

URL url = new URL("https://www.googleapis.com/oauth2/v1/userinfo?access_token=" + accessToken);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
Log.log("con = "+con);
int sc = con.getResponseCode();

When I print con to log, it's not null. But when I call con. getResponseCode() the app crash with null pointer exception.

Plese help me to fix it. Thanks

[Tran Quoc Anh]

is there anyone have the same problem? please help me to fix it. thanks.

[Tran Quoc Anh]

If the URL is https (ex: https://twitter.com/), some methods of HttpURLConnection will cause Null Pointer Exception. But if the URL is http (ex: http://www.robovm.org/), it doesn't happen. Plese help me.

[Niklas Therning]

Check out this previous post and make sure you have those patterns in your <forceLinkClasses> in your robovm.xml file: https://groups.google.com/d/msg/robovm/trYc6iv71-Y/e9jdnG54byoJ

On Mon, Jul 21, 2014 at 6:39 AM, Tran Quoc Anh <windlo...@gmail.com> wrote:

If the URL is https (ex: https://twitter.com/), some methods of HttpURLConnection will cause Null Pointer Exception. But if the URL is http (ex: http://www.robovm.org/), it doesn't happen. Plese help me.

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[Tran Quoc Anh]

My app crash with no error in robovm console after add some patterns in my <forceLinkClasses> in my robovm.xml file, like this:

<forceLinkClasses>

<pattern>com.badlogic.gdx.scenes.scene2d.ui.SplitPane$SplitPaneStyle</pattern>

<pattern>org.apache.harmony.security.provider.**</pattern>

<pattern>com.android.org.bouncycastle.jce.provider.**</pattern>

<pattern>org.apache.harmony.xnet.provider.jsse.**</pattern>

<pattern>com.badlogic.gdx.sqlite.robovm.RobovmDatabaseManager</pattern>

<pattern>SQLite.**</pattern>

<!-- For http: support in URLConnection -->

    <pattern>com.android.okhttp.HttpHandler</pattern>

    <!-- For https: support in URLConnection -->

    <pattern>com.android.okhttp.HttpsHandler</pattern>

    <!-- OpenSSL is preferred over BouncyCastle. This pulls in full OpenSSL support. -->

    <pattern>com.android.org.conscrypt.**</pattern>

    <!-- We still need KeyStore.BKS and CertPathValidator.PKIX from BouncyCastle -->

    <pattern>com.android.org.bouncycastle.jce.provider.BouncyCastleProvider</pattern>

    <pattern>com.android.org.bouncycastle.jcajce.provider.keystore.BC$Mappings</pattern>

    <pattern>com.android.org.bouncycastle.jcajce.provider.keystore.bc.BcKeyStoreSpi</pattern>

    <pattern>com.android.org.bouncycastle.jcajce.provider.keystore.bc.BcKeyStoreSpi$Std</pattern>

    <pattern>com.android.org.bouncycastle.jce.provider.PKIXCertPathValidatorSpi</pattern>

    <!-- Use AndroidDigestFactoryOpenSSL as AndroidDigestFactory implementation -->

    <pattern>com.android.org.bouncycastle.crypto.digests.AndroidDigestFactoryOpenSSL</pattern>

      <pattern>java.util.logging.SimpleFormatter</pattern>

    <pattern>java.util.logging.ConsoleHandler</pattern>

  </forceLinkClasses>

Please look my crash file included. Thanks

[Niklas Therning]

This works just fine for me both in the simulator and on device:

    URL url = new URL("https://www.googleapis.com/oauth2/v1/userinfo?access_token=" + "foo");

    HttpURLConnection con = (HttpURLConnection) url.openConnection();

    System.out.println(con);

    int sc = con.getResponseCode();

    System.out.println(sc);

Prints out

com.android.okhttp.internal.http.HttpsURLConnectionImpl$HttpUrlConnectionDelegate:https://www.googleapis.com/oauth2/v1/userinfo?access_token=foo

401

Obviously I cannot test this with a valid access token.

I have this in my robovm.xml

  <forceLinkClasses>

    <!-- For http: support in URLConnection -->

    <pattern>com.android.okhttp.HttpHandler</pattern>

    <!-- For https: support in URLConnection -->

    <pattern>com.android.okhttp.HttpsHandler</pattern>

    <!-- OpenSSL is preferred over BouncyCastle. This pulls in full OpenSSL support. -->

    <pattern>com.android.org.conscrypt.**</pattern>

    <!-- We still need KeyStore.BKS and CertPathValidator.PKIX from BouncyCastle -->

    <pattern>com.android.org.bouncycastle.jce.provider.BouncyCastleProvider</pattern>

    <pattern>com.android.org.bouncycastle.jcajce.provider.keystore.BC$Mappings</pattern>

    <pattern>com.android.org.bouncycastle.jcajce.provider.keystore.bc.BcKeyStoreSpi</pattern>

    <pattern>com.android.org.bouncycastle.jcajce.provider.keystore.bc.BcKeyStoreSpi$Std</pattern>

    <pattern>com.android.org.bouncycastle.jce.provider.PKIXCertPathValidatorSpi</pattern>

    <!-- Use AndroidDigestFactoryOpenSSL as AndroidDigestFactory implementation -->

    <pattern>com.android.org.bouncycastle.crypto.digests.AndroidDigestFactoryOpenSSL</pattern>

  </forceLinkClasses>

If you want more help on this one you should come up with a minimal test case and create a new issue and refer to the test app: https://github.com/robovm/robovm/issues/new