How to Resolve javax.net.ssl.SSLHandshakeException Errors in Java?

Resolving javax.net.ssl.SSLHandshakeException Error

When attempting to establish a connection with a server, you may encounter the "javax.net.ssl.SSLHandshakeException" error, particularly when utilizing a servlet for back-end processing. This error stems from an inability to verify the server's certificate and establish a secure connection.

Obtaining the Public Certificate

To resolve this issue, you must first obtain the public certificate from the server you intend to connect to. You can acquire the certificate through various methods:

• Contact the server administrator and request a copy.
• Use OpenSSL to download the certificate.
• Access the server with a browser, view the security information, and save the certificate.

Adding the Certificate to the Trust Store

Once you have the certificate saved as a file, you must add it to the Java Virtual Machine (JVM)'s trust store. Locate the "cacerts" file at either "$JAVA_HOME/jre/lib/security/" or "$JAVA_HOME/lib/security/" and follow these steps:

1. Run the "keytool" command as a user with write permissions to the "cacerts" file.
2. Use the "-import" flag to import the certificate file and specify an alias (a meaningful name for the certificate).
3. Provide the path to the "cacerts" file using the "-keystore" flag.

After these steps are completed, you will be able to establish a secure connection to the server, ensuring that you are communicating with the intended server and protecting against unauthorized access.

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