Proguard not working with jackson

[priyanshi bhardwaj]

Hello,
I am using jackson library in my project

gradle.java

    implementation 'com.fasterxml.jackson.core:jackson-core:2.4.2'
    implementation 'com.fasterxml.jackson.core:jackson-databind:2.10.1'

proguard.rules.pro

-keepattributes *Annotation*,EnclosingMethod,Signature
-keepnames class com.fasterxml.jackson.** { *; }
-dontwarn com.fasterxml.jackson.databind.**


# General
-keepattributes SourceFile,LineNumberTable,*Annotation*,EnclosingMethod,Signature,Exceptions,InnerClasses

It is storing the data in realm in abc.java

 
                        ObjectMapper Obj = new ObjectMapper();
                        try{
                            String jsonStr = Obj.writeValueAsString(map.get(key));
                           metadata.setValue((map.get(key)!=null)?jsonStr:" ");
                        }catch (Exception e){

                        }
                    

after fetching from realm xyz.java

  HashMap<String, Object> jsonMap = new HashMap<String, Object>();


                            jsonMap = (HashMap<String, Object>) new Gson().fromJson(metadata.getValue(), new TypeToken<HashMap<String, Object>>() {
                            }.getType());
jsonMap is used further

I am getting a NPE while creating release build:
Cause: java.lang.NullPointerException


Unable to debug this issue further. Any help is appreciated. Thanks in advance

[Tim Moores]

I assume that it works correctly if you don't use obfuscation - is that correct?

A quick search fro "jackson android proguards" finds pages such as https://proguard-rules.blogspot.com/2017/05/jackson-proguard-rules.html, https://stackoverflow.com/questions/27687128/how-to-setup-proguard-for-jackson-json-processor and especially https://github.com/krschultz/android-proguard-snippets/pull/132, all of which have different ProGuard settings than the one you're using.

[priyanshi bhardwaj]

Tim Moores wrote:I assume that it works correctly if you don't use obfuscation - is that correct?

Yes. I have tried multiple proguard rules for jackson but none of them is working. I am constantly getting a NPE. There is no details also so I can't figure out exactly where Npe is coming. how can I debug it to get detailed logs of the respective issue.

[priyanshi bhardwaj]

Tim Moores wrote:
A quick search fro "jackson android proguards" finds pages such as https://proguard-rules.blogspot.com/2017/05/jackson-proguard-rules.html, https://stackoverflow.com/questions/27687128/how-to-setup-proguard-for-jackson-json-processor and especially https://github.com/krschultz/android-proguard-snippets/pull/132, all of which have different ProGuard settings than the one you're using.

I have tried above proguard guard settings too but still getting a npe

[Tim Moores]

priyanshi bhardwaj wrote:how can I debug it to get detailed logs of the respective issue.

Add plenty of logging - logcat is your friend. in particular, make sure all object references you use are not null - that's how NPEs happen.