How to Resolve javax.net.ssl.SSLHandshakeException During PayPal Servlet Integration?

Resolving javax.net.ssl.SSLHandshakeException for PayPal Integration

When attempting to integrate PayPal into an application that employs a servlet for backend processing, some users may encounter the javax.net.ssl.SSLHandshakeException. This error arises due to certification path issues, hindering secure communication.

Solution: Importing Server Certificate

To resolve the error, the public certificate of the PayPal server must be obtained and imported into the JVM's trust store. Here are the steps to follow:

1. Obtain the Certificate: Contact the PayPal server administrator to request the public certificate.
2. Save the Certificate: Using a browser or OpenSSL, connect to the server and save a copy of the certificate to a file.
3. Import the Certificate: Open a terminal using keytool and run the following command:

keytool -import -file <certificate file> -alias <alias name> -keystore <trust store path>

Replace with the path to the saved certificate, with a meaningful alias, and with the path to the Java trust store (typically located at $JAVA_HOME/lib/security/cacerts).

4. Enter Password: If prompted, enter the default trust store password, which is usually "changeit."

By completing these steps, the server's certificate is added to the trusted certificates of the JVM, ensuring secure communication with PayPal through the servlet.

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