how to resolve jsoup error: unable to find valid certification path to requested target

Question

I am trying to parse the html of the following URL:

https://www.smuc.ac.kr/mbs/smuc/jsp/board/list.jsp?boardId=6993&id=smuc_040100000000

I\'m getting the

Answer 1

Following George's comment, I will post this as an answer.
I made a Kotlin version for checklist's solution, as follows:

package crawlers

import java.security.KeyManagementException

import java.security.NoSuchAlgorithmException

import java.security.SecureRandom
import java.security.cert.X509Certificate
import javax.net.ssl.SSLContext

import javax.net.ssl.SSLSocketFactory
import javax.net.ssl.TrustManager
import javax.net.ssl.X509TrustManager

class SSLHelperKotlin {

    companion object {

        @JvmStatic
        fun socketFactory(): SSLSocketFactory {
            val trustAllCerts = arrayOf(
                    object : X509TrustManager {
                        override fun getAcceptedIssuers() = arrayOf()
                        override fun checkClientTrusted(certs: Array, authType: String) {}
                        override fun checkServerTrusted(certs: Array, authType: String) {}
                    }
            )

            return try {
                val sslContext: SSLContext = SSLContext.getInstance("SSL")
                sslContext.init(null, trustAllCerts, SecureRandom())
                sslContext.socketFactory
            } catch (e: NoSuchAlgorithmException) {
                throw RuntimeException("Failed to create a SSL socket factory", e)
            } catch (e: KeyManagementException) {
                throw RuntimeException("Failed to create a SSL socket factory", e)
            }
        }
    }
}

It's also available on this gist.