我在对bishengjdk-21中kerberos认证进行国密算法改造适配时发现，开启Debug模式无法输出完整调试信息。

验证过程如下：

1，jaas.conf配置文件
KerberosTest { com.sun.security.auth.module.Krb5LoginModule required useKeyTab=true keyTab="/etc/security/keytabs/dolphinscheduler.keytab" principal="dolphinscheduler@xxxxx" storeKey=true doNotPrompt=true debug=true; };

2，KerberosTest.java测试代码
`import javax.security.auth.Subject;
import javax.security.auth.kerberos.KerberosTicket;
import javax.security.auth.login.LoginContext;
import org.ietf.jgss.GSSCredential;
import java.util.Set;

public class KerberosTest {
public static void main(String[] args) throws Exception {
// 1. Kerberos 基础配置，开启了debug模式
System.setProperty("java.security.krb5.conf", "/etc/krb5.conf");
System.setProperty("sun.security.krb5.debug", "true");
System.setProperty("java.security.auth.login.config", "/root/bishengjdk/jaas.conf");
// 2. 登录
LoginContext lc = new LoginContext("KerberosTest");
lc.login();
System.out.println("Kerberos authentication successful");
// 3. 获取认证信息
Subject subject = lc.getSubject();
System.out.println("Authenticated Subject: " + subject);
// 4. 打印票据详情
Set tickets = subject.getPrivateCredentials(KerberosTicket.class);
tickets.forEach(ticket -> {
System.out.println("
[Ticket Details]");
System.out.println(" Client: " + ticket.getClient());
System.out.println(" Server: " + ticket.getServer());
System.out.println(" Valid Until: " + ticket.getEndTime());
});
// 5. 检查 GSSCredential（可选）
Set creds = subject.getPublicCredentials(GSSCredential.class);
System.out.println("
GSSCredentials Available: " + !creds.isEmpty());
}
}`

3，编译之后运行测试代码，发现src/java.security.jgss/share/classes/sun/security/krb5/internal/crypto/dk包有些类运行时的关键细节信息无法输出

4，我修改了少量开关代码以便debug模式能够生效，添加Kerberos认证时输出完整的调试信息，方便Kerberos协议理解和改造。