public static <T extends Certificate> void createTrustStore(
            String filename, Password password, Map<String, T> certs) throws GeneralSecurityException, IOException {
        KeyStore ks = KeyStore.getInstance("JKS");
        try (InputStream in = Files.newInputStream(Paths.get(filename))) {
            ks.load(in, password.value().toCharArray());
        } catch (EOFException e) {
            ks = createEmptyKeyStore();
        }
        for (Map.Entry<String, T> cert : certs.entrySet()) {
            ks.setCertificateEntry(cert.getKey(), cert.getValue());
        }
        saveKeyStore(ks, filename, password);
    }
Creates a keystore with a single key and saves it to a file.

@param filename String file to save
@param password String store password to set on keystore
@param keyPassword String key password to set on key
@param alias String alias to use for the key
@param privateKey Key to save in keystore
@param cert Certificate to use as certificate chain associated to key
@throws GeneralSecurityException for any error with the security APIs
@throws IOException if there is an I/O error saving the file
clients/src/test/java/org/apache/kafka/test/TestSslUtils.java