How to import a jks certificate in java trust store

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How do I import a .jks file into the java security's truststore? All the tutorial I'm seeing is using a ".crt" file. However, I only have the ".jks" file which is also the keystore I generated using the keytool command.

Currently, I'm following this tutorial.

I was able to generate a Java keystore and key pair and generate a certificate signing request (CSR) for an existing Java keystore, which is based on the tutorial. But I cannot import a root or intermediate CA certificate to an existing Java keystore, and import a signed primary certificate to an existing Java keystore, because it is looking for a ".cert" file.

Am I missing something on the steps listed on the tutorial? How can I trust a certificate if the only file I have is the ".jks" file? And what is the use of the ".csr" file?

Please note that I'm using Windows.

jks keytool https ssl java
2 Answers
#Use Keytool command to generate a self-signed certificate and install the certificate in Client Machine JDK Security Key store path.

# generate a certificate using JKS format keystore
keytool -genkey -alias selfrest -keyalg RSA -keypass pass123 -storetype JKS -keystore selfsigned.jks -storepass pass123 -validity 360 -keysize 2048

# To check the content of the keystore, we can use keytool again:
keytool -list -v -keystore selfsigned.jks

#Export Self signed certificate into .cer file
keytool -exportcert -alias selfrest -keystore selfsigned.jks -file selfsigned.cer

# (Run As Administrator- to open CMD.exe)
# Install self-signed certificate into Java JDK CA Certificate key store path
# to avoid giving certificate path in the client program.
keytool -import -alias selfrest -keystore "C:\Program Files\Java\jdk1.8.0_181\jre\lib\security\cacerts" -file selfsigned.cer

# List certificates stored in JDK Key store which you have just now imported into JDK Security path.
keytool -list -keystore "%JAVA_HOME%\jre\lib\security\cacerts
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