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If you encounter the "Java: unable to find valid certification path to requested target" error, it means that the Java application you are trying to run is unable to establish a secure connection with the target server due to an invalid or missing certification path. This error commonly occurs when accessing HTTPS URLs or making secure connections using Java.
Here are a few possible solutions to fix this error:
Solution 1: Update the Java Runtime Environment (JRE)
One common reason for the "Java: unable to find valid certification path to requested target" error is an outdated or unsupported version of the Java Runtime Environment (JRE). To resolve this issue, you can try updating your JRE to the latest version.
To update Java, follow these steps:
1. Visit the official Java website at https://www.java.com.
2. Download the latest version of Java for your operating system.
3. Run the installer and follow the on-screen instructions to update Java.
After updating Java, restart your application and check if the error persists. If the error still occurs, try the next solution.
Related Article: Java Adapter Design Pattern Tutorial
Solution 2: Import the SSL Certificate
Related Article: Java Exception Handling Tutorial
If the target server is using a self-signed or custom SSL certificate, Java may not recognize it as a trusted certificate by default. In such cases, you can manually import the SSL certificate into the Java keystore to establish a secure connection.
To import the SSL certificate, follow these steps:
1. Open a terminal or command prompt.
2. Use the following command to export the SSL certificate:
echo -n | openssl s_client -connect <host>:<port> | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > certificate.crt
Replace <host> with the hostname of the target server and <port> with the port number (e.g., 443 for HTTPS).
3. Execute the command, and it will save the SSL certificate in the certificate.crt file.
4. Locate your Java installation directory. The default location on Linux is /usr/lib/jvm.
5. Navigate to the jre/lib/security directory inside the Java installation directory.
6. Use the following command to import the SSL certificate into the Java keystore:
sudo keytool -import -alias
-keystore cacerts -file /path/to/certificate.crt