#vulnerable code 
                              @Test
  public void testStaleAndExpired() throws IOException {
    long expiration = HeaderCacheElement.TOKEN_STALENESS_MS + 1;
    initialize(expiration);
    Assert.assertEquals(CacheState.Good, underTest.headerCache.getCacheState());
    long startTime = 2L;
    setTimeInMillieconds(startTime);
    Assert.assertEquals(CacheState.Stale, underTest.headerCache.getCacheState());
    long expiredStaleDiff =
        HeaderCacheElement.TOKEN_STALENESS_MS - HeaderCacheElement.TOKEN_EXPIRES_MS;
    setTimeInMillieconds(startTime + expiredStaleDiff);
    Assert.assertEquals(CacheState.Expired, underTest.headerCache.getCacheState());
  } 
                            #location 5 
                            #vulnerability type UNSAFE_GUARDED_BY_ACCESS
#fixed code
                              @Test
  public void testStaleAndExpired() throws IOException {
    long expiration = HeaderCacheElement.TOKEN_STALENESS_MS + 1;
    initialize(expiration);
    Assert.assertEquals(CacheState.Good, underTest.getCacheState());
    long startTime = 2L;
    setTimeInMillieconds(startTime);
    Assert.assertEquals(CacheState.Stale, underTest.getCacheState());
    long expiredStaleDiff =
        HeaderCacheElement.TOKEN_STALENESS_MS - HeaderCacheElement.TOKEN_EXPIRES_MS;
    setTimeInMillieconds(startTime + expiredStaleDiff);
    Assert.assertEquals(CacheState.Expired, underTest.getCacheState());
  }