The Oracle JRE can automatically download the intermediate certificate:

Support for the Authority Information Access (AIA) Extension

Support for the caIssuers access method of the Authority Information Access extension is available. It is disabled by default for compatibility and can be enabled by setting the system property com.sun.security.enableAIAcaIssuers to the value true.

If set to true, Sun's PKIX implementation of CertPathBuilder uses the information in a certificate's AIA extension (in addition to CertStores that are specified) to find the issuing CA certificate, provided it is a URI of type ldap, http, or ftp.

Note: Depending on your network and firewall setup, it may be necessary to also configure your networking proxy servers as described in the [networking documentation(http://docs.oracle.com/javase/8/docs/technotes/guides/net/properties.html).

(Source: Oracle, "Java PKI Programmer's Guide".)

The Oracle JRE can automatically download the intermediate certificate:

Support for the Authority Information Access (AIA) Extension

Support for the caIssuers access method of the Authority Information Access extension is available. It is disabled by default for compatibility and can be enabled by setting the system property com.sun.security.enableAIAcaIssuers to the value true.

If set to true, Sun's PKIX implementation of CertPathBuilder uses the information in a certificate's AIA extension (in addition to CertStores that are specified) to find the issuing CA certificate, provided it is a URI of type ldap, http, or ftp.

Note: Depending on your network and firewall setup, it may be necessary to also configure your networking proxy servers as described in the networking documentation.

(Source: Oracle, "Java PKI Programmer's Guide".)