Using latest Dex2Jar : Seeing this failure " Failed resolution of: Lres/Hex "

[vramasam]

Hello @ThexXTURBOXx

When we try to use https://mvnrepository.com/artifact/com.squareup.okhttp3/okhttp/4.9.3 in the apk. It results in following error.

Process: com.sampleapp, PID: 13211
java.lang.NoClassDefFoundError: Failed resolution of: Lres/Hex;
at okhttp3.internal.http2.Huffman.$d2j$hex$c61541e3$decode_I(Unknown Source:16)
at okhttp3.internal.http2.Huffman.(Unknown Source:17)
at okhttp3.internal.http2.Hpack$Writer.writeByteString(Unknown Source:11)
at okhttp3.internal.http2.Hpack$Writer.writeHeaders(Unknown Source:264)
at okhttp3.internal.http2.Http2Writer.headers(Unknown Source:12)
at okhttp3.internal.http2.Http2Connection.newStream(Unknown Source:82)
at okhttp3.internal.http2.Http2Connection.newStream(Unknown Source:6)
at okhttp3.internal.http2.Http2ExchangeCodec.writeRequestHeaders(Unknown Source:25)
at okhttp3.internal.connection.Exchange.writeRequestHeaders(Unknown Source:16)
at okhttp3.internal.http.CallServerInterceptor.intercept(Unknown Source:29)
at okhttp3.internal.http.RealInterceptorChain.proceed(Unknown Source:80)
at okhttp3.internal.connection.ConnectInterceptor.intercept(Unknown Source:32)
at okhttp3.internal.http.RealInterceptorChain.proceed(Unknown Source:80)
at okhttp3.internal.cache.CacheInterceptor.intercept(Unknown Source:192)
at okhttp3.internal.http.RealInterceptorChain.proceed(Unknown Source:80)
at okhttp3.internal.http.BridgeInterceptor.intercept(Unknown Source:171)
at okhttp3.internal.http.RealInterceptorChain.proceed(Unknown Source:80)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(Unknown Source:37)
at okhttp3.internal.http.RealInterceptorChain.proceed(Unknown Source:80)
at okhttp3.internal.connection.RealCall.getResponseWithInterceptorChain$okhttp(Unknown Source:119)
at okhttp3.internal.connection.RealCall.execute(Unknown Source:27)

How we are calling the OkHttpClient from code: The problem is with 4.x.x http library

private static final String URL_STRING = "https://www.google.com/";
private void okHttpLib()
{
try {
new Thread(new Runnable()
{
@OverRide
public void run()
{
try {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(URL_STRING)
.build();
Response response = client.newCall(request).execute();
Log.i(LOG_TAG, "OK HTTP, " + URL_STRING + ", status code: " + response.code());
response.body().string();
}
catch (Exception e) {
Log.e(LOG_TAG, "Exception while making okhttp call");
}
}
}).start();
}
catch (Exception e) {
Log.e(LOG_TAG, "Exception", e);
}
}

Can you please check this issue?

[vramasam]

Not seeing this exception specific to okHttp library. Observed the same issue in another apk.
Process: com.hdfc.techapp, PID: 9828
java.lang.NoClassDefFoundError: Failed resolution of: Lres/Hex;
at androidx.appcompat.R$styleable.$d2j$hex$b9a46b2b$decode_I(Unknown Source:16)
at androidx.appcompat.R$styleable.(Unknown Source:115)
at androidx.appcompat.app.AppCompatDelegateImpl.createView(Unknown Source:8)
at

Tried the same with the old version of Dex2Jar there this issue is not happening. Can you please look into it?

[ThexXTURBOXx]

Hello, sorry for not responding for quite some time. I needed to finish some work for University and academic purposes.
What exactly are you trying to do? It seems like you are trying to disassemble a dex file into a jar and reassembling it into Dalvik and then trying to run the apk/dex file on an Android phone. Is that correct?

I searched for the res/Hex file everywhere, but no matter what, I can't find it. Even if you run jadx on an APK file with okhttp included, there is no res/Hex class file.

[vramasam]

@ThexXTURBOXx No problem. Thank you for the response back.

Yes your understanding is correct, we are disassemble the dex file in to jar and then reassembling the Dalvik .

Here as you said this file "res/Hex" is not available in the final apk.
We tried including the "dex-translator/src/test/java/res/Hex.java" in the final dex file, then this error is not coming. or We have to change IR2JConverter MAX_FILL_ARRAY_BYTES to Integer.MAX

Ideally my understanding, in this class dex-translator/src/main/java/com/googlecode/d2j/dex/Dex2Asm.java addHexDecodeMethod suppose to do that. But it didn't happen. I may be wrong here, I thought it will give you idea where to look out. Sorry If I am wrong here.

We also observed this is not happening with Dex2Jar first version for the same apk. It's happening because of the changes done with Dex2Jar latest changes.

[ThexXTURBOXx]

@vramasam Thanks for additional information. Please try out v47 where I believe I have fixed this issue :)

[ThexXTURBOXx]

For future reference:
Introduced bug in: 62eba63
Fixed in: 0e26919 (additional fix in 8496704)

[vramasam]

@vramasam Thanks for additional information. Please try out v47 where I believe I have fixed this issue :)

Sure. Thank you. Will test and update the results here.

[ThexXTURBOXx]

@vramasam Do you have any news on this or are there still any errors occurring regarding this?

[vramasam]

Hello @ThexXTURBOXx

We observed below exception:
2022-03-31 16:17:48.090 20215-20215/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.hdfc.techapp, PID: 20215
java.lang.NoSuchMethodError: No static method decode_B(Ljava/lang/String;)[B in class Landroidx/appcompat/R$styleable; or its super classes (declaration of 'androidx.appcompat.R$styleable' appears in /data/app/~~aQ9x9aGc8JPDrjAM226nIA==/com.xxx.xxxx-qkeGzcHRj9s7g-NO1EajHw==/base.apk)
at androidx.appcompat.R$styleable.$d2j$hex$497c133b$decode_I(Unknown Source:22)
at androidx.appcompat.R$styleable.(Unknown Source:115)
at androidx.appcompat.app.AppCompatDelegateImpl.createView(Unknown Source:8)

[ThexXTURBOXx]

Ah I see! I forgot one small thing. Give me a second :)

[ThexXTURBOXx]

Try again using version v48. Now, the method name should also be properly changed.

[vramasam]

Okay @ThexXTURBOXx . Thank you. Will test and let you know

[ThexXTURBOXx]

@vramasam Any news on this? :)

[vramasam]

Hello @ThexXTURBOXx

Sorry for the delay response. The above error got resolved. We are seeing the following exception.

2022-04-07 12:30:05.898 21597-21597/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.xx.xxxx, PID: 21597
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xxx.techapp/com.xxxx.xxxx.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3763)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3939)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2278)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:246)
at android.app.ActivityThread.main(ActivityThread.java:8429)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:596)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor(Unknown Source:438)
at androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor(Unknown Source:5)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(Unknown Source:0)
at androidx.appcompat.app.AppCompatActivity.setContentView(Unknown Source:7)

[ThexXTURBOXx]

Thanks for your feedback! Nice to hear that this issue has been resolved.
I will take a look at the new issue as soon as possible

[vramasam]

Thank you @ThexXTURBOXx .

If you have any further updates on the ticket, please let us know.

[ThexXTURBOXx]

Yes, I will! I think the main problem is that dex2jar is not the right tool for a complete, 100% working disassembling and reassembling of dex files.
There will always be errors because of incompatibilities between both instruction sets.
Depending on what you want to achieve, it might be worth to take a look at dexlib2 or even multidexlib2 (from DexPatcher). They provide nice functionality for parsing and manipulating these files (if that is what you want to do).

[vramasam]

Ohh okay. Thank you for the update and suggestion. Then this issue is not possible to be fixed ?