Cannot access org.apache.hc.client5.http.utils.URLEncodedUtils in kotlin build script - kotlin

Question

Why is org.apache.hc unresolved considering the dependency has been added?
package com.blah
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory
// Error seen when import line is uncommented:
// 'Unresolved reference: hc'
// import org.apache.hc.client5.http.utils.URLEncodedUtils <--------
import org.w3c.dom.Element
import org.xml.sax.InputSource
import java.io.FileWriter
import java.io.StringReader
import java.net.URI
import java.util.*
val projectVersion: String by project
val liquibaseVersion: String = "4.13.0"
val liquibaseGradlePluginVersion: String = "2.0.4"
plugins {
java
id("org.springframework.boot") apply false
id("org.liquibase.gradle") apply true
}
dependencies {
implementation(platform(org.springframework.boot.gradle.plugin.SpringBootPlugin.BOM_COORDINATES))
liquibaseRuntime(platform(org.springframework.boot.gradle.plugin.SpringBootPlugin.BOM_COORDINATES))
implementation("org.postgresql:postgresql")
implementation("org.liquibase:liquibase-core:$liquibaseVersion")
implementation("org.liquibase:liquibase-gradle-plugin:$liquibaseGradlePluginVersion")
implementation("org.hibernate:hibernate-core")
implementation("org.springframework.boot:spring-boot-starter-data-jpa")
implementation("com.fasterxml.jackson.core:jackson-core")
implementation("com.fasterxml.jackson.core:jackson-databind")
implementation("com.fasterxml.jackson.dataformat:jackson-dataformat-yaml")
implementation("org.springframework.boot:spring-boot-starter-data-jpa")
// No errors when building the Gradle model during import into IDE
// https://mvnrepository.com/artifact/org.apache.httpcomponents.core5/httpcore5
implementation("org.apache.httpcomponents.core5:httpcore5:5.2.1")
liquibaseRuntime("org.liquibase:liquibase-core:$liquibaseVersion")
liquibaseRuntime("org.postgresql:postgresql")
liquibaseRuntime("org.springframework.boot:spring-boot-starter-data-jpa")
liquibaseRuntime(sourceSets.getByName("main").output)
}

Answer 1

Dependencies declared in the dependencies {} block are added to the classpath of the project, not the classpath of the buildscript.
If you want to use dependencies in a Gradle build script, then there are two options
Use the buildscript {} block in build.gradle(.kts)
// build.gradle.kts
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath("org.apache.httpcomponents.core5:httpcore5:5.2.1")
}
}
plugins {
java
id("org.springframework.boot") apply false
id("org.liquibase.gradle") apply true
}
dependencies {
// project dependencies...
}
Define dependencies in an included build, or buildSrc
// ./buildSrc/build.gradle.kts
plugins {
`kotlin-dsl` // a Kotlin or Java plugin is required, so that 'implementation' is available
}
dependencies {
// dependencies defined here will be available in all of the project's build scripts
implementation("org.apache.httpcomponents.core5:httpcore5:5.2.1")
}