Spring Boot 2.7.1 LetsEncrypt PEM keystore throws Resource location must not be null - spring

Question

So I read that Spring Boot now supports PEM since 2.7.0
https://docs.spring.io/spring-boot/docs/2.7.0-SNAPSHOT/reference/htmlsingle/#howto.webserver.configure-ssl 17.3.7. Configure SSL
So I am using PEM generated by certbot.
My application.properties
spring.jpa.generate-ddl=true
spring1.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=false
spring.jpa.properties.hibernate.format_sql=false
server.port=443
server.ssl.certificate=fullchain1.pem
server.ssl.certificate.certificate-private-key=privkey1.pem
server.ssl.trust-certificate=fullchain1.pem
When I launch I get
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Could not load key store 'null'
Caused by: org.springframework.boot.web.server.WebServerException: Could not load key store 'null'
Caused by: java.lang.IllegalArgumentException: Resource location must not be null

Answer 1

As per the documentation SSL configuration springboot
UPDATE:
Adding the content from link to directly in the answer, as link can
get updates
SSL can be configured declaratively by setting the various
server.ssl.* properties, typically in application.properties or
application.yml. The following example shows setting SSL properties
using a Java KeyStore file:
server.port=8443
server.ssl.key-store=classpath:keystore.jks
server.ssl.key-store-password=secret
server.ssl.key-password=another-secret
The following example shows setting SSL properties using PEM-encoded
certificate and private key files:
server.port=8443
server.ssl.certificate=classpath:my-cert.crt
server.ssl.certificate-private-key=classpath:my-cert.key
server.ssl.trust-certificate=classpath:ca-cert.crt
Your properties are not correctly declared,
server.ssl.certificate.certificate-private-key=privkey1.pem should be changed to server.ssl.certificate-private-key=privkey1.pem

Answer 2

So this workaround works
#Configuration
public class SSLConfig {
#Bean
public ConfigurableServletWebServerFactory webServerFactory() throws Exception {
TomcatServletWebServerFactory factory = new TomcatServletWebServerFactory();
Ssl ssl = new Ssl();
ssl.setEnabled(true);
ssl.setCertificate("cert1.pem");
ssl.setCertificatePrivateKey("privkey1.pem");
ssl.setKeyStoreType("PKCS12");
ssl.setKeyStorePassword(""); // without this decrytption fails
factory.setSsl(ssl);
factory.setPort(443);
return factory;
}
}

Answer 3

server.ssl.key-store=file:///Users/...
Have you tried this way of setting the path? First, make sure your application up with the correct path, then dig into the next step.