I have applied the code below, which loads the keystore that contains the required certificate, unfortunately not worked....

char[] keyStorePassword = "MYPASSWORD".toCharArray();
KeyStore ks = KeyStore.getInstance("JKS");
FileInputStream fis = new FileInputStream("MYKEYSTORE.jks");
ks.load(fis, keyStorePassword);
fis.close();

TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(/*"X509"*/TrustManagerFactory.getDefaultAlgorithm());
trustManagerFactory.init(ks);
LightstreamerClient.setTrustManagerFactory(trustMa nagerFactory);