Please see minimized test below:

$ cat Test.java
public class Test extends java.security.Signer implements java.io.Serializable {
    String n;

    public Test(String s) {
        n = s;
    }
}

$ /java/re/jdk/7/promoted/fcs/b148/binaries/solaris-sparc/bin/javac Test.java
Note: Test.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

$ /java/re/jdk/7/promoted/fcs/b148/binaries/solaris-sparc/bin/serialver Test
Test: static final long serialVersionUID = 7190557222763814429L;

$ /java/re/jdk/8/promoted/ea/b72/binaries/solaris-sparc/bin/serialver Test
Test: static final long serialVersionUID = 7190557222763814429L;

$ /java/re/jdk/8/promoted/ea/b73/binaries/solaris-sparc/bin/serialver Test
Test: static final long serialVersionUID = -4685217835722692979L;