java can't connect to https sites

[Sam Uong]

After installing 18.04 and default-jdk, which provides java/javac 1.10.1, Java applications are unable to connect to https sites. This can be reproduced with a simple Java program:

sam@sam-desktop:~$ cat <<EOF >HttpsTester.java
> import java.net.URL;
> import javax.net.ssl.HttpsURLConnection;
>
> public class HttpsTester {
> public static void main(String[] args) {
> try {
> HttpsURLConnection connection = (HttpsURLConnection) new URL("https://www.ubuntu.com").openConnection();
> System.out.println("Response code: " + connection.getResponseCode());
> System.out.println("It worked!");
> } catch (Exception e) {
> System.out.println(e.getMessage());
> }
> }
> }
> EOF
sam@sam-desktop:~$ javac HttpsTester.java
sam@sam-desktop:~$ java HttpsTester
java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty

This seems to be due to a misconfigured keystore in /etc/ssl/certs/java/cacerts. If I use the keystore which is bundled in Oracle's JRE, then the certificate check during connection succeeds:

sam@sam-desktop:~$ tar -zxf jre-10.0.1_linux-x64_bin.tar.gz
sam@sam-desktop:~$ java -Djavax.net.ssl.trustStore=jre-10.0.1/lib/security/cacerts HttpsTester
Response code: 200

I'm not sure if this is somehow related to 1406483, but I've tried recreating my keystore (using 'sudo update-ca-certificates -f' and 'sudo apt-get install --reinstall ca-certificates-java') without success.

My keystore is not empty, but contains a different set of keys to Oracle's one:

sam@sam-desktop:~$ keytool -list -keystore /etc/ssl/certs/java/cacerts -storepass changeit | grep 'Your keystore contains'
Warning: use -cacerts option to access cacerts keystore
Your keystore contains 134 entries

sam@sam-desktop:~$ keytool -list -keystore jre-10.0.1/lib/security/cacerts -storepass changeit | grep 'Your keystore contains'
Your keystore contains 104 entries

[Sam Uong (samuong)]

Running "java -Djavax.net.ssl.trustStorePassword=changeit HttpsTester" works, so I've marked this as a duplicate of bug #1743139.