Get private key from a Java keystore file using Groovy

private_key.java

import java.security.Key
import java.security.KeyStore

if (args.length < 3)
        throw new IllegalArgumentException('Expected args: <Keystore file> <Keystore format> <Keystore password> <alias> <key password>')

def keystoreName = args[0]
def keystoreFormat = args[1]
def keystorePassword = args[2]
def alias = args[3]
def keyPassword = args[4]

def keystore = KeyStore.getInstance(keystoreFormat)
keystore.load(new FileInputStream(keystoreName), keystorePassword.toCharArray())
def key = keystore.getKey(alias, keyPassword.toCharArray())

println "-----BEGIN PRIVATE KEY-----"
println key.getEncoded().encodeBase64()
println "-----END PRIVATE KEY-----"

getting null point exception when i ran the below code in groovy script

import java.security.Key
import java.security.KeyStore

def keystorePassword ="XXXXXXXX"
def keystoreName = "C:\Users\mmodupalli\Desktop\qeee.jks"
def keystore = KeyStore.getInstance("JKS")
keystore.load(new FileInputStream(keystoreName), keystorePassword.toCharArray())
def key = keystore.getKey("testhie.itsguardian.com", keystorePassword.toCharArray())
log.info key.getEncoded().encodeBase64()

here is the screen shot

Worked for me, thanks!