Proguard causing error on org.jetbrains.exposed - kotlin

Question

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Resultados de tradução
I'm trying to use Proguard to obfuscate my application's code, but this is an almost impossible task. It is a desktop application developed in Kotlin language using TornadoFX (JavaFX), and org.jetbrains.exposed. After a lot of work, I managed to make the application compile. But when trying to run the system it gives an error message when trying to use the database functions using org.jetbrains.exposed. My application has a set of packages but I want to obfuscate only one package that contains 6 files, which is the important part of the software. But even using "keep", Proguard changes the classes and the application stops working.
I would like to know if there is a way to obfuscate only some files and tell ProGuard not to change the other files.
If it is not possible, does anyone know how to fix the problem when using the org.jetbrains.exposed library together with Proguard?
build.gradle task
task proguard(type: ProGuardTask) {
doFirst {
waveCounterJar
}
println("Performing obfuscation..")
configuration 'proguard.conf'
injars "$inputJar", filter: "!META-INF/NOTICE,!META-INF/NOTICE.txt,!META-INF/LICENSE,!META-INF/LICENSE.txt"
outjars "$outputJar"
libraryjars "${System.getProperty('java.home')}\\lib\\rt.jar"
libraryjars "${dependsDir}"
}
proguard.conf
-dontshrink
-dontoptimize
-keepkotlinmetadata
# Exclude all other class
-dontwarn !br.com.mawan.waveCounter.waveDetectionUtils.**
-keep class !br.com.mawan.waveCounter.waveDetectionUtils.** { *; }
-keep class * extends org.jetbrains.exposed.dao.IntIdTable { *; }
-keep class * extends org.jetbrains.exposed.dao.IntEntityClass { *; }
-keep class * extends org.jetbrains.exposed.dao.IntEntity { *; }
Pallet.class
package br.com.mawan.waveCounter.models
import org.jetbrains.exposed.dao.EntityID
import org.jetbrains.exposed.dao.IntEntity
import org.jetbrains.exposed.dao.IntEntityClass
import org.jetbrains.exposed.dao.IntIdTable
import org.joda.time.DateTime
object PalletsTable: IntIdTable() {
val palletNr = varchar("palletNr", 50)
val op = varchar("op", 50).nullable()
val palletOp = varchar("palletOp", 50).nullable()
val wave = varchar("wave", 5)
val stacks = integer("stacks")
val totalWaves = integer("totalWaves").default(0)
val totalBoards = integer("totalBoards").default(0)
val estimatedHeight = integer("estimatedHeight").default(0)
val quantity1 = integer("quantity1").default(0)
val quantity2 = integer("quantity2").default(0)
val message = varchar("message", 1000)
val createdDate = datetime("createdDate").default(DateTime.now())
val exported = bool("exported").default(false)
val disabled = bool("disabled").default(false)
}
class Pallet(id: EntityID<Int>) : IntEntity(id) {
companion object : IntEntityClass<Pallet>(PalletsTable)
var palletNr by PalletsTable.palletNr
var op by PalletsTable.op
var palletOp by PalletsTable.palletOp
var wave by PalletsTable.wave
var stacks by PalletsTable.stacks
var totalWaves by PalletsTable.totalWaves
var totalBoards by PalletsTable.totalBoards
var createdDate by PalletsTable.createdDate
var estimatedHeight by PalletsTable.estimatedHeight
var quantity1 by PalletsTable.quantity1
var quantity2 by PalletsTable.quantity2
var message by PalletsTable.message
var disabled by PalletsTable.disabled
var exported by PalletsTable.exported
}
Code where occurs error
transaction {
exec("SET ##global.time_zone = '+00:00'")
// The error occurs here
SchemaUtils.createMissingTablesAndColumns(PalletsTable, LogWebTable, ActionScannerTable, ConfigTable, ScannerDataTable)
exec("ALTER TABLE pallets CHANGE createddate createddate DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP")
}
Error
Caused by: kotlin.KotlinNullPointerException: null
at org.jetbrains.exposed.sql.Table.clone(Unknown Source)
at org.jetbrains.exposed.sql.Table.cloneWithAutoInc(Unknown Source)
at org.jetbrains.exposed.sql.Table.autoIncrement(Unknown Source)
at org.jetbrains.exposed.sql.Table.autoIncrement$default(Unknown Source)
at org.jetbrains.exposed.dao.IntIdTable.<init>(Unknown Source)
at org.jetbrains.exposed.dao.IntIdTable.<init>(Unknown Source)
at br.com.mawan.waveCounter.models.PalletsTable.<init>(Unknown Source)
at br.com.mawan.waveCounter.models.PalletsTable.<clinit>(Unknown Source)
... 26 common frames omitted