code: private SerializableProtectedString getKeyPassword(String alias) {
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
              Tr.debug(tc, "getKeyPassword " + alias);
  
          SerializableProtectedString keyPass = certAliasInfo.get(alias);
          if (keyPass != null) {
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
                  Tr.debug(tc, "getKeyPassword entry found.");
          } else {
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
                  Tr.debug(tc, "getKeyPassword -> null");
          }
          return keyPass;
      }
docs: Query the password of a key entry in this keystore.
  
  @param alias
  @return