NoClassDefFoundError: Failed resolution of: Lorg/apache/logging/log4j/LogManager

[FutureHere]

After upgrade Proguard version 6.0.3 to 7.3.0
apk crash

mapping:

proguard.optimize.gson._GsonUtil -> b.a.a.a:
{"fileName":"_GsonUtil.java","id":"sourceFile"}
org.apache.logging.log4j.Logger logger -> a
43:43:void () ->
63:75:com.google.gson.TypeAdapter getTypeAdapter(com.google.gson.Gson,java.lang.Class,java.lang.Object) -> a
95:108:com.google.gson.TypeAdapter getTypeAdapter(com.google.gson.Gson,com.google.gson.reflect.TypeToken,java.lang.Object) -> a
116:120:java.lang.reflect.Type getRuntimeTypeIfMoreSpecific(java.lang.reflect.Type,java.lang.Object) -> a
131:131:boolean isCustomTypeAdapter(com.google.gson.TypeAdapter) -> a
45:45:void () ->

I think the reason is Gson optimization

can u help me ? Thanks

[FutureHere]

[mrjameshamilton]

Hi @FutureHere !

Can you try to narrow down the issue by disabling ProGuard features and/or adding keep rules?

For example: you can disable GSON optimization with -optimizations !library/gson (see https://www.guardsquare.com/manual/configuration/optimizations)

You can also try disabling obfuscation, optimization and shrinking generally to see if one of those are causing the problem: -dontshrink, -dontobfuscate, -dontoptimize

You can also try adding keep rules for the missing class.

If you cannot solve the issue via configuration, can you provide a reproducible sample?

[FutureHere]

Hi @FutureHere !

Can you try to narrow down the issue by disabling ProGuard features and/or adding keep rules?

For example: you can disable GSON optimization with -optimizations !library/gson (see https://www.guardsquare.com/manual/configuration/optimizations)

You can also try disabling obfuscation, optimization and shrinking generally to see if one of those are causing the problem: -dontshrink, -dontobfuscate, -dontoptimize

You can also try adding keep rules for the missing class.

If you cannot solve the issue via configuration, can you provide a reproducible sample?

How can i use proguard without log4j ?
i find the problem proguard dependent org.apache.logging.log4j and change the app code In proguard process
but my application not dependent log4j, so the crash that Noclassdefound log4j happened.

we cant dependent log4j in our app ,so How can i use proguard without log4j ? Whether it can be set？

[FutureHere]

Hi @FutureHere !

Can you try to narrow down the issue by disabling ProGuard features and/or adding keep rules?

For example: you can disable GSON optimization with -optimizations !library/gson (see https://www.guardsquare.com/manual/configuration/optimizations)

You can also try disabling obfuscation, optimization and shrinking generally to see if one of those are causing the problem: -dontshrink, -dontobfuscate, -dontoptimize

You can also try adding keep rules for the missing class.

If you cannot solve the issue via configuration, can you provide a reproducible sample?

How can i use proguard without log4j ?
i find the problem proguard dependent org.apache.logging.log4j and change the app code In proguard process
but my application not dependent log4j, so the crash that Noclassdefound log4j happened.

we cant dependent log4j in our app ,so How can i use proguard without log4j ? Whether it can be set？

[FutureHere]

-optimizations !library/gson

[FutureHere]

addConfigurationDebugging?

[mrjameshamilton]

Thanks for the extra information! It looks like log4j loggers were accidentally added to code that is injected into the app for GSON optimization and configuration debugging. Should be solved by #328