Update:

I was able to resolve this.
Now I am facing another issue while deserialization

I just want to obfuscate one package and want to keep rest of my classes as it is, still I guess proguard is modifying the byte code of the class I added as Keep in the pro rules.
java.lang.IllegalStateException: unread block data
at java.base/java.io.ObjectInputStream$BlockDataInputStream.setBlockDataMode(ObjectInputStream.java:3033)
at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1722)
at java.base/java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2496)
at java.base/java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2390)
at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2228)
at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1687)
at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:489)
at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:447)
at org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:87)
at org.apache.spark.serializer.JavaSerializerInstance.deserialize(JavaSerializer.scala:129)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:507)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)

sample.pro
-keep class java.** { ; }
-keep class kotlin.* { ; }
-keep class groovy.* { *; }

-keep interface java.** { ; }
-keep interface kotlin.* { ; }
-keep interface groovy.* { *; }

#-dontnote kotlin.**
#-dontnote kotlinx.**
#-dontnote com.google.gson.**

-keep class com.datametica.eagle.service.* {
*;
}

-keep class com.datametica.eagle.input.* {
;
}
-keep class com.datametica.eaglecore.enrichstatement.result.* {
*;
}

-keep class com.datametica.eaglecore.enrichstatement.domain.entity.** {
;
}
-keep class com.datametica.eaglecore.relationshipextraction.services. {
;
}
-keep class com.datametica.eagle.schema. {
;
}
-keep class com.datametica.eagle.sql.dictionary. {
;
}
-keep class com.datametica.eagle.extensions. {
;
}
-keep class com.datametica.eaglecore.relationshipextraction.domain. {
*;
}

-keep interface com.datametica.eaglecore.relationshipextraction.domain.* {
*;
}

-keep interface com.datametica.eaglecore.relationshipextraction.services.* {
;
}
-keep,includedescriptorclasses,includecode class com.datametica.eagle.serialization.kryo.* {
*;
}

-keep enum ** {
*;
}

-keepclassmembers class ** {
static java.lang.String *;
}

-keepclassmembers class ** {
synthetic ;
synthetic ;
}
-keepparameternames

-keep class com.datametica.eaglecore.commons.dictionary.* {
;
}
-keep class com.datametica.eagle.provider.querylogprovider. {
;
}
-keep class com.datametica.eaglecore.enrichstatement.builder.domain. {
;
}
-keep class com.datametica.eaglecore.enrichstatement.expression. {
;
}
-keep interface com.datametica.eaglecore.enrichstatement.expression. {
;
}
-keep public class com.datametica.eaglecore.definitionExtraction.helper. {
;
}
-keep public class com.datametica.eaglecore.definitionExtraction.domain. {
;
}
-keep public class com.datametica.eaglecore.definitionExtraction.core. {
;
}
-keep public class com.datametica.eaglecore.calcite.* {
*;
}
#Testing purpose

-keepattributes Signature
-keepattributes SourceFile,ConstantValue,LineNumberTable,RuntimeVisibleAnnotations,RuntimeInvisibleAnnotations,RuntimeVisibleParameterAnnotations,RuntimeInvisibleParameterAnnotations,StackMapTable,EnclosingMethod
-keepnames class **
-keepnames interface **
-keeppackagenames

-dontshrink
-dontoptimize
-ignorewarnings
-dontpreverify
-dontskipnonpubliclibraryclasses
-dontskipnonpubliclibraryclassmembers
-dontusemixedcaseclassnames
-printconfiguration config-output.txt
-verbose
-forceprocessing
#-dontobfuscate
#-target 11
-printmapping proguard.map

Thanks in advance

from proguard.

If you're running code on the JVM then you must preverify the classes: so you should remove -dontpreverify from the configuration.

If you enable any of shrinking, optimization or obfuscation, then the stackmap frames are removed at the beginning of ProGuard here.

The preverification is then executed at the end of ProGuard to recompute the stackmap frames after any modifications that ProGuard would have made due to shrinking, optimization or obfuscation here.

It's not clear how your problem is related to your configuration though. Can you provide a reproducible sample?

from proguard.