How to Resolve SSL Errors in JDK 11 with Valid Certificates?

What steps can I take to fix SSL errors in JDK 11 when using a valid certificate previously successful in earlier Java versions?

SSL errors in JDK 11, despite using valid certificates that functioned without issues in previous Java versions, can often arise due to changes in the Java security model and strict certificate validation processes.

// Add a valid certificate to the Java keystore
keytool -import -alias mycert -file mycert.crt -keystore $JAVA_HOME/lib/security/cacerts -storepass changeit

// Verify your certificate installation
keytool -list -v -alias mycert -keystore $JAVA_HOME/lib/security/cacerts -storepass changeit

Causes

• Changes in the Java Security Architecture in JDK 11
• Increased strictness on Certificate Authorities (CAs)
• Deprecation of certain SSL/TLS protocols
• Changes in default trust store configurations

Solutions

• Ensure that your certificate is included in the Java keystore. Use the command: `keytool -importkeystore -srckeystore yourSourceKeystore -destkeystore yourDestinationKeystore`
• Check for the correct Java version by running `java -version` to confirm you are using JDK 11.
• Update your CA certificates: use `keytool -list -v -keystore $JAVA_HOME/lib/security/cacerts` to see what's included in your trust store.
• Review your application’s SSL implementation to ensure it aligns with JDK 11's requirements.

Mistake: Not updating the JAVA_HOME environment variable to point to JDK 11.

Solution: Make sure JAVA_HOME is set correctly to the path of your JDK 11 installation.

Mistake: Assuming the default cacerts file contains all needed certificates.

Solution: Regularly update the cacerts file with the latest certificates from your Certificate Authority.

Mistake: Not properly importing the certificate into the keystore.

Solution: Ensure you use the correct alias and keystore location when running keytool commands.