Tomcat: Native library which allows using OpenSSL was not found

I figured out what the issue was.

I had already set up an SSL/TLS/HTTPS connection protocol in the opt/tomcat/conf/server.xml file:

<Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol"
           maxThreads="150" SSLEnabled="true" >
    <UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol" />
    <SSLHostConfig>
        <Certificate certificateKeyFile="conf/key.key"
                     certificateFile="conf/cert.crt"
                     certificateChainFile="conf/chain.crt"
                     type="RSA" />
    </SSLHostConfig>
</Connector>

but the *.war file that was gonna use the connection was not put in the opt/tomcat/webapps directory.

Here's how I solved it:

I simply added the *.war file in the opt/tomcat/webapps directory of tomcat, and then I restarted the tomcat server using:

sudo systemctl restart tomcat

And everything worked fine.

That's all.

I hope this helps