Create a Java Certificate
keytool.exe -genkey -keyalg algorithm -alias my_alias -keystore myfilename.jks -storepass my_password -validity my_days -keysize my_size
Options:
 -alias <alias>                  alias name of the entry to process
 -keyalg <keyalg>                key algorithm name
 -keysize <keysize>              key bit size
 -sigalg <sigalg>                signature algorithm name
 -destalias <destalias>          destination alias
 -dname <dname>                  distinguished name
 -startdate <startdate>          certificate validity start date/time
 -ext <value>                    X.509 extension
 -validity <valDays>             validity number of days
 -keypass <arg>                  key password
 -keystore <keystore>            keystore name
 -storepass <arg>                keystore password
 -storetype <storetype>          keystore type
 -providername <providername>    provider name
 -providerclass <providerclass>  provider class name
 -providerarg <arg>              provider argument
 -providerpath <pathlist>        provider classpath
 -v                              verbose output
 -protected                      password through protected mechanism

Example:

keytool.exe -genkey -keyalg RSA -alias myjavacert -keystore mykeystore.jks -storepass 123456qwerty -validity 365 -keysize 2048
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