I am migrating a project to a new API and thus have to update the deserialization and data classes. Using the old API and data classes everything works fine, but using the updated version I get the following error
java.lang.ClassNotFoundException: Didn't find class "fooapp.component.ui.cafeteria.model.CafeteriaData" on path: DexPathList[[zip file "/data/app/~~Wji9DkrkAr7qFGIIJ3Aglg==/fooapp-dbYvbr8le25I8FGioIrW6w==/base.apk"],nativeLibraryDirectories=[/data/app/~~Wji9DkrkAr7qFGIIJ3Aglg==/fooapp-dbYvbr8le25I8FGioIrW6w==/lib/x86_64, /system/lib64, /system_ext/lib64]]
when attempting to access a nested field, eg:
response.cafeterias[0]
Note that response.cafeterias is parsed correctly and accessible. So it seems like parsing works for nesting level 1, but somehow breaks when stepping down into the next level.
I am aware that the prices field is missing in the mapping, it is not needed for now. I will check if adding it to the serialization hierarchy fixes the issue tomorrow.
{"canteens": [
{
"version": "2.1",
"canteen_id": "best-canteen",
"weeks": [
{
"number": 48,
"year": 2021,
"days": [
{
"date": "2021-11-29",
"dishes": [
{
"name": "Tasty food 1",
"prices": {
"students": {
"base_price": 0,
"price_per_unit": 0.33,
"unit": "100g"
},
"staff": {
"base_price": 0,
"price_per_unit": 0.55,
"unit": "100g"
},
"guests": {
"base_price": 0,
"price_per_unit": 0.66,
"unit": "100g"
}
},
"ingredients": [
"Gl",
"GlW",
"Kn"
],
"dish_type": "Daily 4"
}]
}]
}]
}]
}
## GSON 2.2.4 specific rules ##
# Gson uses generic type information stored in a class file when working with fields. Proguard
# removes such information by default, so configure it to keep all of it.
-keepattributes Signature
# For using GSON @Expose annotation
-keepattributes *Annotation*
-keepattributes EnclosingMethod
# Gson specific classes
-keep class sun.misc.Unsafe { *; }
-keep class com.google.gson.stream.** { *; }
# OkHttp
-keepattributes Signature
-keepattributes *Annotation*
-keep class com.squareup.okhttp.** { *; }
-keep interface com.squareup.okhttp.** { *; }
-dontwarn com.squareup.okhttp.**
# OkHttp
-keepattributes Signature
-keepattributes *Annotation*
-keep class okhttp3.** { *; }
-keep interface okhttp3.** { *; }
-dontwarn okhttp3.**
# Retrofit 1.X
-keep class com.squareup.okhttp.** { *; }
-keep class retrofit.** { *; }
-keep interface com.squareup.okhttp.** { *; }
-dontwarn com.squareup.okhttp.**
-dontwarn okio.**
-dontwarn retrofit.**
-dontwarn rx.**
-keepclasseswithmembers class * {
@retrofit.http.* <methods>;
}
# If in your rest service interface you use methods with Callback argument.
-keepattributes Exceptions
# If your rest service methods throw custom exceptions, because you've defined an ErrorHandler.
-keepattributes Signature
# Also you must note that if you are using GSON for conversion from JSON to POJO representation, you must ignore those POJO classes from being obfuscated.
# Here include the POJO's that have you have created for mapping JSON response to POJO for example.
# Retrofit 2.X
## https://square.github.io/retrofit/ ##
-dontwarn retrofit2.**
-keep class retrofit2.** { *; }
-keepattributes Signature
-keepattributes Exceptions
-keepclasseswithmembers class * {
@retrofit2.http.* <methods>;
}
# Configuration for Guava 18.0
#
# disagrees with instructions provided by Guava project: https://code.google.com/p/guava-libraries/wiki/UsingProGuardWithGuava
-keep class com.google.common.io.Resources {
public static <methods>;
}
-keep class com.google.common.collect.Lists {
public static ** reverse(**);
}
-keep class com.google.common.base.Charsets {
public static <fields>;
}
-keep class com.google.common.base.Joiner {
public static com.google.common.base.Joiner on(java.lang.String);
public ** join(...);
}
-keep class com.google.common.collect.MapMakerInternalMap$ReferenceEntry
-keep class com.google.common.cache.LocalCache$ReferenceEntry
# http://stackoverflow.com/questions/9120338/proguard-configuration-for-guava-with-obfuscation-and-optimization
-dontwarn javax.annotation.**
-dontwarn javax.inject.**
-dontwarn sun.misc.Unsafe
# Guava 19.0
-dontwarn java.lang.ClassValue
-dontwarn com.google.j2objc.annotations.Weak
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
# Guava 20.0
-dontwarn com.google.**
# Guava 23.5
-dontwarn afu.org.checkerframework.**
-dontwarn org.checkerframework.**
# Add project specific ProGuard rules here.
#
# For more details, see
# http://developer.android.com/guide/developing/tools/proguard.html
-dontobfuscate
-keep class fooapp.models.**{*;}
# Simple-Xml Proguard Config
# NOTE: You should also include the Android Proguard config found with the build tools:
# $ANDROID_HOME/tools/proguard/proguard-android.txt
# Keep public classes and methods.
-dontwarn com.bea.xml.stream.**
-dontwarn org.simpleframework.xml.stream.**
-keep class org.simpleframework.xml.**{ *; }
-keepclassmembers,allowobfuscation class * {
@org.simpleframework.xml.* <fields>;
@org.simpleframework.xml.* <init>(...);
}
-keep class org.sqlite.** { *; }
-keep class org.sqlite.database.** { *; }
# Okio
-keep class sun.misc.Unsafe { *; }
-dontwarn java.nio.file.*
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
-dontwarn okio.**
-keep class com.tickaroo.tikxml.** { *; }
-keep class **$$TypeAdapter { *; }
-keepclasseswithmembernames class * {
@com.tickaroo.tikxml.* <fields>;
}
-keepclasseswithmembernames class * {
@com.tickaroo.tikxml.* <methods>;
}
data class CafeteriaResponse(
@SerializedName("canteens")
var cafeterias: List<CafeteriaData>,
)
data class CafeteriaData(
@SerializedName("version")
var version: String? = null,
@SerializedName("canteen_id")
var cafeteriaSlug: String? = null,
@SerializedName("weeks")
var menusByWeeks: List<WeeklyMenu>
)
data class WeeklyMenu(
@SerializedName("number")
var weekOfYear: Short = -1,
@SerializedName("year")
var year: Short = -1,
@SerializedName("days")
var dishesForWeek: List<DailyMenu>
)
data class DailyMenu(
@SerializedName("date")
var date: DateTime? = null,
@SerializedName("dishes")
var dishesForDay: List<Dish>
)
data class Dish(
@SerializedName("name")
var name: String? = null,
@SerializedName("ingredients")
var ingredients: List<String>,
@SerializedName("dish_type")
var type: String? = null
)
All of these data classes are in the same package.
proguard-square-retrofit.pro needed to be updated including the new POJOs that are used for the API data deserialization.
I added all the POJOs to the below proguard ruleset. I put them all in a seperate package to get finer granularity in obfuscation and avoid keeping unnecessary classes.
# Retrofit 1.X
-keep class com.squareup.okhttp.** { *; }
-keep class retrofit.** { *; }
-keep interface com.squareup.okhttp.** { *; }
-dontwarn com.squareup.okhttp.**
-dontwarn okio.**
-dontwarn retrofit.**
-dontwarn rx.**
-keepclasseswithmembers class * {
@retrofit.http.* <methods>;
}
# If in your rest service interface you use methods with Callback argument.
-keepattributes Exceptions
# If your rest service methods throw custom exceptions, because you've defined an ErrorHandler.
-keepattributes Signature
# Also you must note that if you are using GSON for conversion from JSON to POJO representation, you must ignore those POJO classes from being obfuscated.
# Here include the POJO's that have you have created for mapping JSON response to POJO for example.
-keep class fooapp.component.ui.cafeteria.model.deserialization.*