If the jar is a "console app" it may not actually show anything since there is no GUI.
One option would be to add a protocol handler for JAR files. This is something Oracle doesn't do, but the registry keys would look like what is below *****JAVA PROTOCOL *****
The two bold items would need to be changed to match your java version and save everything below *****JAVA PROTOCOL ***** save to a .reg file and double click it to import.
By default though Java should add the following registry values which also should allow jars to be executed.
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\.jar]
@="jarfile"
[HKEY_CLASSES_ROOT\jarfile]
@="Executable Jar File"
[HKEY_CLASSES_ROOT\jarfile\shell]
[HKEY_CLASSES_ROOT\jarfile\shell\open]
[HKEY_CLASSES_ROOT\jarfile\shell\open\command]
@="\"C:\\Program Files (x86)\\Java\\jre1.8.0_211\\bin\\javaw.exe\" -jar \"%1\" %*"
*****JAVA PROTOCOL *****
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\JAVA.URI.JAR]
[HKEY_CLASSES_ROOT\JAVA.URI.JAR\shell]
[HKEY_CLASSES_ROOT\JAVA.URI.JAR\shell\open]
[HKEY_CLASSES_ROOT\JAVA.URI.JAR\shell\open\command]
@="\"C:\\Program Files (x86)\\Java\\jre1.8.0_211\\bin\\javaw.exe\" -jar \"%1\" %*"
[HKEY_LOCAL_MACHINE\SOFTWARE\RegisteredApplications]
"JarFile"="Software\\JavaSoft\\Capabilities"
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\JavaSoft\Capabilities]
"ApplicationName"="Java.Jar"
"ApplicationDescription"="Java jar runtime"
"ApplicationIcon"="\"C:\\Program Files (x86)\\Java\\jre1.8.0_211\\bin\\javaw.exe\""
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\JavaSoft\Capabilities\FileAssociations]
[HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\JavaSoft\Capabilities\URLAssociations]
"javajar"="JAVA.URI.JAR"