Paul's suggestion is correct. I got a little bit deeper in that subject and found a reason.
Android apk packaging tool (APKBuilder class from sdklib.jar) ignores different folders while it creates the package (source). One of those folders is META-INF - no matter if its in the attached library or in the project's source folder.
Workaround for version 1.8 (and probably other also, but I didn't test it) of Jersey is to provide custom (default one looks up META-INF/services/ which is not present in android apk) implementation for ServiceFinder$ServiceIteratorProvider which has hard coded provider class names. I based my implementation on this implementation proposed by Lucas:
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import android.util.Log;
import com.sun.jersey.spi.service.ServiceFinder.ServiceIteratorProvider;
public class AndroidServiceIteratorProvider<T> extends ServiceIteratorProvider<T> {
private static final String TAG = AndroidServiceIteratorProvider.class.getSimpleName();
private static final String MESSAGE = "Unable to load provider";
private static final HashMap<String, String[]> SERVICES = new HashMap<String, String[]>();
private static final String[] com_sun_jersey_spi_HeaderDelegateProvider = {
"com.sun.jersey.core.impl.provider.header.MediaTypeProvider",
"com.sun.jersey.core.impl.provider.header.StringProvider"
};
private static final String[] com_sun_jersey_spi_inject_InjectableProvider = {
};
private static final String[] javax_ws_rs_ext_MessageBodyReader = {
"com.sun.jersey.core.impl.provider.entity.StringProvider",
"com.sun.jersey.core.impl.provider.entity.ReaderProvider"
};
private static final String[] javax_ws_rs_ext_MessageBodyWriter = {
"com.sun.jersey.core.impl.provider.entity.StringProvider",
"com.sun.jersey.core.impl.provider.entity.ReaderProvider"
};
static {
SERVICES.put("com.sun.jersey.spi.HeaderDelegateProvider",
com_sun_jersey_spi_HeaderDelegateProvider);
SERVICES.put("com.sun.jersey.spi.inject.InjectableProvider",
com_sun_jersey_spi_inject_InjectableProvider);
SERVICES.put("javax.ws.rs.ext.MessageBodyReader",
javax_ws_rs_ext_MessageBodyReader);
SERVICES.put("javax.ws.rs.ext.MessageBodyWriter",
javax_ws_rs_ext_MessageBodyWriter);
SERVICES.put("jersey-client-components", new String[]{});
SERVICES.put("com.sun.jersey.client.proxy.ViewProxyProvider", new String[]{});
}
@SuppressWarnings("unchecked")
@Override
public Iterator<Class<T>> createClassIterator(Class<T> service,
String serviceName, ClassLoader loader,
boolean ignoreOnClassNotFound) {
String[] classesNames = SERVICES.get(serviceName);
int length = classesNames.length;
ArrayList<Class<T>> classes = new ArrayList<Class<T>>(length);
for (int i = 0; i < length; i++) {
try {
classes.add((Class<T>) Class.forName(classesNames[i]));
} catch (ClassNotFoundException e) {
Log.v(TAG, MESSAGE,e);
}
}
return classes.iterator();
}
@Override
public Iterator<T> createIterator(Class<T> service, String serviceName,
ClassLoader loader, boolean ignoreOnClassNotFound) {
String[] classesNames = SERVICES.get(serviceName);
int length = classesNames.length;
ArrayList<T> classes = new ArrayList<T>(length);
for (int i = 0; i < length; i++) {
try {
classes.add(service.cast(Class.forName(classesNames[i])
.newInstance()));
} catch (IllegalAccessException e) {
Log.v(TAG, MESSAGE,e);
} catch (InstantiationException e) {
Log.v(TAG, MESSAGE,e);
} catch (ClassNotFoundException e) {
Log.v(TAG, MESSAGE,e);
}
}
return classes.iterator();
}
}
I removed most of the classes since I didn't use them and also they were causing verification errors on dalvik vm...
NOTE: It means that with this implementation you can use only subset of headers/types supported by Jersey (I needed only String). To support other types you have to add providers located in META-INF/services folder of jersey-client.jar (or from Lucas' implementation) and check if they don't cause verification errors on Android.
The above code should be used as follows:
ServiceFinder.setIteratorProvider(new AndroidServiceIteratorProvider());
Client client = Client.create();
EDIT:
It seems that the problem have been fixed in android-maven-plugin.
[email protected] wrote:
The pull request with the fix was merged into master and will be released with 3.2.1:
