This article is useful if you want to download all certificates (the whole certificate chain) from a remote host and import into a trust store. Or, you are getting the error below that suggests that you do not have the right certificates and you need to download the right ones.
org.mule.extension.ldap.internal.exception.LDAPException: org.mule.extension.ldap.internal.exception.LDAPException: CONNECTIVITY: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
openssl s_client -showcerts -verify 5 -connect www.google.com:443 < /dev/null | awk '/BEGIN/,/END/{ if(/BEGIN/){a++}; out="cert"a".pem"; print >out}'
keytool -importcert -file cert1.pem -keystore $JAVA_HOME/jre/lib/security/cacerts -alias "alias-test1" -deststoretype JKS keytool -importcert -file cert2.pem -keystore $JAVA_HOME/jre/lib/security/cacerts -alias "alias-test2" -deststoretype JKS
001115764

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