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

Troubleshooting javax.net.ssl.SSLHandshakeException Error

In response to the reported issue encountering javax.net.ssl.SSLHandshakeException error during PayPal integration, the following solution is presented:

Understanding the Issue

The error stems from an inability to establish a secure TLS connection due to the absence of a trusted certificate for the target server. This arises when the client (Java application) cannot verify the server's identity via its X.509 certificate chain.

Solution

To resolve this issue, it is necessary to add the server's certificate to the JVM's trust store:

1. Obtain Server's Certificate: Acquire the public certificate from the PayPal server. This can be achieved through various methods, such as downloading it using OpenSSL or directly from a browser's security settings.

2. Import Certificate into Trust Store: Navigate to the Java security directory (typically located at $JAVA_HOME/lib/security or $JAVA_HOME/jre/lib/security). Use the keytool utility to import the acquired certificate into the trust store (cacerts file):

   keytool -import -file <cert_file> -alias <alias_name> -keystore <path_to_cacerts>

   where:

   • is the path to the saved certificate file
   • is a meaningful name for the certificate
   • is the path to the cacerts file
3. Enter Password: Enter the trust store password (default: "changeit").

After completing these steps, the Java application should be able to establish a secure TLS connection with PayPal without encountering the SSLHandshakeException error.

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