How Can I Connect to a Server with a Self-Signed SSL Certificate in Java?

Accepting Self-Signed SSL Certificates in Java Clients

When connecting to a server with a self-signed or expired SSL certificate, Java clients may encounter errors. To overcome this issue, two options are available:

Option 1: Modifying Java Truststore

1. Export the self-signed certificate from your browser in CER format.
2. Import the certificate into the JVM truststore using the following command:

<JAVA_HOME>\bin\keytool -import -v -trustcacerts
-alias server-alias -file server.cer
-keystore cacerts.jks -keypass changeit
-storepass changeit

This establishes a chain of trust between the client and server.

Option 2: Disabling Certificate Validation (Not Recommended)

Disable certificate validation to bypass the trust chain verification. However, this approach is insecure and should be avoided.

// TrustAllCerts class for disabling certificate validation
...

// Initialize SSL context
...

// Disable validation
HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());

While Option 2 allows you to access HTTPS URLs without truststore certificates, it leaves you vulnerable to security threats. It is strongly recommended to use Option 1 or obtain a valid certificate from a trusted CA for the server.

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