The signer's certificate chain is not validated warning

Hi
I have collected my certificate using Firefox, Run ‘back-up-all’ and saved it as a p12 file

when i run
jarsigner -storetype pkcs12 -keystore mycert.p12 myjar.jar “xxxx ltd’s comodo ca limited id”

I get

Warning:
The signer’s certificate chain is not validated.

What is going wrong here ?

keytool -list -v -storetype pkcs12 -keystore mycert.p12

gives the following:

Keystore type: PKCS12
Keystore provider: SunJSSE
Your keystore contains 1 entry

Alias name: xxx ltd’s comodo ca limited id
Creation date: 07-Aug-2015
Entry type: PrivateKeyEntry
Certificate chain length: 3
Certificate[1]:

Certificate[2]:
Owner: CN=COMODO RSA Code Signing CA, O=COMODO CA Limited, L=Salford, ST=Greater Manchester, C=GB
Issuer: CN=COMODO RSA Certification Authority, O=COMODO CA Limited, L=Salford, ST=Greater Manchester, C=GB
Serial number:
Valid from: Thu May 09 01:00:00 BST 2013 until: Tue May 09 00:59:59 BST 2028

Certificate[3]:
Owner: CN=COMODO RSA Certification Authority, O=COMODO CA Limited, L=Salford, ST=Greater Manchester, C=GB
Issuer: CN=COMODO RSA Certification Authority, O=COMODO CA Limited, L=Salford, ST=Greater Manchester,

SOLVED:
switched to JDK1.8 - it works fine

JDK1.7 is BUGGY BUGGY BUGGY