Java 从信任库程序删除证书

我尝试从JAVA中的信任库程序中删除证书

public static void deleteCertificate(final File trustStore, final String password, final String alias) {
    try (final FileInputStream fis = new FileInputStream(trustStore)) {
        final KeyStore keystore = KeyStore.getInstance("UBER");
        keystore.load(fis, password.toCharArray());
        if (keystore.containsAlias(alias)) {
            keystore.deleteEntry(alias);
        }
        else {
            throw new IllegalStateException("Alias " + alias + " not found in trust store");
        }
    }
    catch (final Exception e) {
        throw new IllegalStateException("Error occures while deleting certificate.", e);

程序通过keystore.deleteEntry（别名）行，但证书仍在信任存储中。没有发生错误，应用程序运行正常，没有任何问题

我错了什么

---

提前感谢。：-）

尝试存储结果

 OutputStream writeStream = new FileOutputStream(filePathToStore);
 keystore.store(writeStream, password);
 writeStream.close();

---

您没有保存该文件