What is needed to import a certificate (https)?

Question

tomcat

Good time.
The task is to install an ssl certificate on tomcat, I did not generate a CSR request, I was given 2 files 1.cer (contains a certificate for the domain site) 2.p7b (contains the entire chain).



import p7b into keystore (java) fails, it says:
keytool error: java.lang.Exception: Input not an X.509 certificate

Setting example tomcat(server.xml)
maxThreads="150" SSLEnabled="true" scheme=" https" secure="true"
clientAuth="false" sslProtocol="TLS" keystoreFile="tomcat.jks" alias="server" keystorePass="12345678"/> Tell me

which way to look.