Check the package information based on the repository data:
zypper if java-11-openjdk
or query the RPM package directly:
rpm -qpi java-11-openjdk-11....rpm
This will output the basic package information.
For example, here's the details of the package "java-11-openjdk-11.0.11.0-3.56.1.x86_64" as available for SLES 15 SP2:
$ rpm -qpi java-11-openjdk-11.0.11.0-3.56.1.x86_64.rpm
Name : java-11-openjdk
Version : 11.0.11.0
Release : 3.56.1
Architecture: x86_64
Install Date: (not installed)
Group : Development/Languages/Java
Size : 637573
License : Apache-1.1 AND Apache-2.0 AND GPL-1.0-or-later AND GPL-2.0-only AND GPL-2.0-only WITH Classpath-exception-2.0 AND LGPL-2.0-only AND MPL-1.0 AND MPL-1.1 AND SUSE-Public-Domain AND W3C
Signature : RSA/SHA256, Do 22 Apr 2021 10:03:24 CEST, Key ID 70af9e8139db7c82
Source RPM : java-11-openjdk-11.0.11.0-3.56.1.src.rpm
Build Date : Do 22 Apr 2021 09:53:38 CEST
Build Host : sheep69
Relocations : (not relocatable)
Packager : https://www.suse.com/
Vendor : SUSE LLC <https://www.suse.com/>
URL : https://openjdk.java.net/
Summary : OpenJDK 11 Runtime Environment
Description :
The OpenJDK 11 runtime environment.
Distribution: SUSE Linux Enterprise 15
To answer your questions in short, the following details should help:
Source RPM : java-11-openjdk-11.0.11.0-3.56.1.src.rpm
URL : https://openjdk.java.net/
SUSE provides a source RPM package for your installed package.