PowerMock java.lang.ClassCastException: sun.net.www.protocol.https.HttpsURLConnectionImpl cannot be passed to javax.net.ssl.HttpsURLConnection

Question

I created mock HttpsURLConnectionbased on StackExchange answer :

import java.net.URL;
import javax.net.ssl.HttpsURLConnection;

...

@RunWith(PowerMockRunner.class)
public class DialogTest {
    public void mockHttpsUrlConnectionExample() throws Exception
    {
        URL mockUrl = PowerMockito.mock(URL.class);
        PowerMockito.whenNew(URL.class).withAnyArguments().thenReturn(mockUrl);
        HttpsURLConnection mockUrlConnection = PowerMockito.mock(HttpsURLConnection.class);
        PowerMockito.when(mockUrl.openConnection()).thenReturn(mockUrlConnection);
        PowerMockito.when(mockUrlConnection.getResponseCode()).thenReturn(200);

        // Create and call my objects ...

    }
}

However, when I use it, I see a cast exception:

java.lang.ClassCastException: sun.net.www.protocol.https.HttpsURLConnectionImpl cannot be cast to javax.net.ssl.HttpsURLConnection

The problem is this code:

import java.net.URL;
import javax.net.ssl.HttpsURLConnection;

...

private Boolean sendRequest(String endpoint, JSONObject requestData, Boolean throwOnAuthException) throws JSONException, IOException {
    this.responseData = null;

    try {
        String serviceURI = getServiceURI();
        String dialogUri = String.format("%s%s", serviceURI, endpoint);
        URL url = new URL(dialogUri);

        // Exception source is this cast
        HttpsURLConnection urlConnection = (HttpsURLConnection) url.openConnection();

However, when I look at the source code, I see that it sun.net.www.protocol.https.HttpsURLConnectionImplimplementsjavax.net.ssl.HttpsURLConnection

Any suggestions to fix this problem?

Answer 1

The problem is a conflict between the regular classloader and PowerMock

PowerMock . , .

. , PowerMock - .  , .

, PowerMock javax.net.ssl.HttpsURLConnection

, make. javax.net.ssl.HttpsURLConnection . , , PowerMock @PowerMockIgnore. .

@PowerMockIgnore({"javax.net.ssl.*"})
@PrepareForTest(android.util.Log.class)
public class DialogTest {
...

, PowerMock HttpsURLConnection

, HttpsURLConnection

factory HttpsURLConnection. .

public class HttpsUrlConnectionProvider {
    public HttpsURLConnection getHttpsURLConnection(String dialogUri) throws IOException {
        URL url = new URL(dialogUri);
        return (HttpsURLConnection) url.openConnection();
    }
}

HttpsURLConnection, HTTP.

final HttpsURLConnection mockUrlConnection = PowerMockito.mock(HttpsURLConnection.class);
PowerMockito.when(mockUrlConnection, "getResponseCode").thenReturn(200);
PowerMockito.when(mockUrlConnection, "getOutputStream").thenReturn(outputStream);

// Replace the HttpsURLConnection factory with one that returns our mock HttpsURLConnection
HttpsUrlConnectionProvider mockConnFactory = new HttpsUrlConnectionProvider() {
    public HttpsURLConnection getHttpsURLConnection(String dialogUri) throws
            IOException {
       return mockUrlConnection;
    }
};
dialog.setHttpsUrlConnectionProvider(mockConnFactory);