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Import certificate to java
PEM: base64
keytool -import -file ~/comodo.pem -alias COMODO_RSA -keystore ${JAVA_HOME}/jre/lib/security/cacerts -storepass changeit

CER/DER: binary
keytool -importcert -file myfile.cer -alias proxy -keystore  $JAVA_HOME/jre/lib/security/cacerts 
Or override