solution: read configuration from dshackle.yaml (in current directory)

src/main/kotlin/io/emeraldpay/dshackle/Starter.kt

@@ -1,10 +1,14 @@
 package io.emeraldpay.dshackle
 
+import org.springframework.beans.factory.config.YamlPropertiesFactoryBean
 import org.springframework.boot.SpringApplication
 import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.env.YamlPropertySourceLoader
 import org.springframework.context.annotation.Import
+import org.springframework.context.annotation.PropertySource
 
 @SpringBootApplication(scanBasePackages = [ "io.emeraldpay.dshackle" ])
+@PropertySource("file:./dshackle.yaml", ignoreResourceNotFound = true, factory = YamlPropertySourceFactory::class)
 @Import(Config::class)
 open class Starter
 

src/main/kotlin/io/emeraldpay/dshackle/YamlPropertySourceFactory.kt

@@ -0,0 +1,28 @@
+package io.emeraldpay.dshackle
+
+import org.apache.commons.lang3.StringUtils
+import org.springframework.beans.factory.config.YamlPropertiesFactoryBean
+import org.springframework.core.env.PropertiesPropertySource
+import org.springframework.core.env.PropertySource
+import org.springframework.core.io.Resource
+import org.springframework.core.io.support.EncodedResource
+import org.springframework.core.io.support.PropertySourceFactory
+import java.util.*
+
+class YamlPropertySourceFactory: PropertySourceFactory {
+
+    override fun createPropertySource(name: String?, resource: EncodedResource): PropertySource<*> {
+        val loadedProperties = this.loadYamlIntoProperties(resource.resource)
+
+        return PropertiesPropertySource(if (StringUtils.isNotBlank(name)) name else resource.resource.filename, loadedProperties)
+
+    }
+
+    private fun loadYamlIntoProperties(resource: Resource): Properties {
+        val factory = YamlPropertiesFactoryBean()
+        factory.setResources(resource)
+        factory.afterPropertiesSet()
+
+        return factory.getObject()
+    }
+}

src/main/resources/application.properties

@@ -1 +1 @@
-port=9001
+port=9001