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Proguard induced : No enum constants for class while deserializing using jackson
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I'm getting the following exception with deserializing a json file using jackson. Any tips on how to fix it?
com.fasterxml.jackson.databind.JsonMappingException: No enum constants for class com.dp.h (through reference chain: com.dp.L["properties"]->com.dp.model.K["traits"]->com.dp.model.W["distribution"])
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:290)
at com.fasterxml.jackson.databind.SerializerProvider.reportMappingProblem(SerializerProvider.java:1360)
at com.fasterxml.jackson.databind.SerializerProvider._createAndCacheUntypedSerializer(SerializerProvider.java:1498)
at com.fasterxml.jackson.databind.SerializerProvider.findValueSerializer(SerializerProvider.java:619)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.resolve(BeanSerializerBase.java:374)
at com.fasterxml.jackson.databind.ser.SerializerCache.addAndResolveNonTypedSerializer(SerializerCache.java:223)
at com.fasterxml.jackson.databind.SerializerProvider._createAndCacheUntypedSerializer(SerializerProvider.java:1483)
at com.fasterxml.jackson.databind.SerializerProvider.findPrimaryPropertySerializer(SerializerProvider.java:739)
at com.fasterxml.jackson.databind.ser.impl.PropertySerializerMap.findAndAddPrimarySerializer(PropertySerializerMap.java:64)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter._findAndAddDynamic(BeanPropertyWriter.java:901)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:710)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:770)
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:183)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:732)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:770)
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:183)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:732)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:770)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeWithType(BeanSerializerBase.java:653)
at com.fasterxml.jackson.databind.ser.impl.TypeWrappedSerializer.serialize(TypeWrappedSerializer.java:32)
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:502)
at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:341)
at com.fasterxml.jackson.databind.ObjectMapper._writeValueAndClose(ObjectMapper.java:4799)
at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:4040)
Caused by: java.lang.IllegalArgumentException: No enum constants for class com.dp.customtypes.h
at com.fasterxml.jackson.databind.util.EnumValues._enumConstants(EnumValues.java:266)
at com.fasterxml.jackson.databind.util.EnumValues.constructFromName(EnumValues.java:85)
at com.fasterxml.jackson.databind.ser.std.EnumSerializer.construct(EnumSerializer.java:123)
at com.fasterxml.jackson.databind.ser.BasicSerializerFactory.buildEnumSerializer(BasicSerializerFactory.java:1218)
at com.fasterxml.jackson.databind.ser.BasicSerializerFactory.findSerializerByPrimaryType(BasicSerializerFactory.java:428)
at com.fasterxml.jackson.databind.ser.BeanSerializerFactory._createSerializer2(BeanSerializerFactory.java:235)
at com.fasterxml.jackson.databind.ser.BeanSerializerFactory.createSerializer(BeanSerializerFactory.java:174)
at com.fasterxml.jackson.databind.SerializerProvider._createUntypedSerializer(SerializerProvider.java:1525)
at com.fasterxml.jackson.databind.SerializerProvider._createAndCacheUntypedSerializer(SerializerProvider.java:1493)
... 38 more
This is how my gradle proguard file looks
tasks.register<proguard.gradle.ProGuardTask>("proguard") {
verbose()
ignorewarnings()
keeppackagenames("com.dp.**")
// retain annotations and other stuff that could be used downstream (since this project is used as a library)
// https://www.guardsquare.com/manual/configuration/attributes
keepattributes("Exceptions,InnerClasses,Signature,Deprecated,SourceFile,LineNumberTable,*Annotation*,EnclosingMethod")
injars(tasks.jar.flatMap { it.archiveFile })
outjars(layout.buildDirectory.file("obfuscated.jar"))
printmapping(layout.buildDirectory.file(project.name + "-obfuscation-mapping.txt"))
val javaHome = BuildUtils.getJavaHome(javaToolchains)
libraryjars(
// filters must be specified first, as a map
mapOf(
"jarfilter" to "!**.jar",
"filter" to "!module-info.class"
),
"$javaHome/jmods/java.base.jmod"
)
libraryjars(sourceSets.main.get().compileClasspath)
// need the following for incremental obfuscation
dontshrink()
dontoptimize()
}
1 answer
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If you have enum classes in the code that is being obfuscated, you need to tell proguard to skip obfuscating the values and valueOf method in your enum class, since it uses reflection internally to fetch the enum constants of an enum.
This is how the rule would look if you are using the gradle proguard plugin
keepclassmembers(
"""
enum * {
public static **[] values();
public static ** valueOf(java.lang.String);
}"""
)
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