Add Configuration

src/main/kotlin/pl/writeonly/omnibus/config/Config.kt

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+package pl.writeonly.omnibus.config
+
+import com.fasterxml.jackson.annotation.JsonInclude
+import com.fasterxml.jackson.databind.ObjectMapper
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.context.annotation.Configuration
+
+@Configuration
+class Config {
+
+    @Autowired
+    private lateinit var objectMapper: ObjectMapper
+
+    fun customizeObjectMapper() {
+        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL)
+    }
+}

src/main/resources/data.sql

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+INSERT INTO post(id, title, content) VALUES (1, 'Test post 1', 'Content1');

src/main/resources/schema.sql

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+CREATE TABLE post (
+  id BIGINT AUTO_INCREMENT PRIMARY KEY,
+  title VARCHAR(400) NOT NULL,
+  content VARCHAR(2000) NULL
+);