Error - trustAnchors parameter must be non-empty

The trustAnchors parameter must be non-empty error typically occurs when you are trying to create an instance of the SSLContext class in Java and you pass an empty trust store as the trustAnchors parameter.

The trustAnchors parameter is used to specify the trusted certificate authorities (CA) that are used to verify the authenticity of the server's certificate. If the trust store is empty, then there are no trusted CAs available to verify the server's certificate, and the error is thrown.

To fix this error, you need to make sure that the trust store is not empty. You can do this by adding the trusted CAs to the trust store. For example:

KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
trustStore.load(null, null);

// Add the trusted CAs to the trust store
InputStream in = new FileInputStream("trusted_cas.jks");
trustStore.load(in, "password".toCharArray());

// Create an SSL context with the trust store
SSLContext sslContext = SSLContext.getInstance("TLS");
TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
sslContext.init(null, trustManagerFactory.getTrustManagers(), null);

In this example, the trust store is loaded from a file called trusted_cas.jks using the load() method