How to Resolve javax.net.ssl.SSLHandshakeException Errors When Integrating PayPal?

Resolving javax.net.ssl.SSLHandshakeException Error

When encountering the javax.net.ssl.SSLHandshakeException error while integrating PayPal into your application, it indicates a problem with SSL certificate validation. To resolve this issue, you need to add the server's certificate to your Java Virtual Machine's (JVM) trust store.

First, acquire the public certificate from the PayPal server. You can download it using OpenSSL or, in this case of an HTTP server, view the page's security info in a browser and save the certificate.

Next, import the certificate into your JVM's trust store. Navigate to the cacerts file located at $JAVA_HOME/jre/lib/security/ or $JAVA_HOME/lib/security/. Use the keytool utility to import the certificate:

keytool -import -file <certificate_file> -alias <alias_name> -keystore <cacerts_file>

Specify a meaningful alias name and enter the password for cacerts (default: changeit).

Upon completion, you have successfully added the PayPal server's certificate to your trust store, allowing you to establish secure and verified SSL connections when communicating with PayPal.

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