**What Causes the \"PKIX Path Building Failed\" Error and How Do I Fix It?**

PKIX Path Building Failed: Inability to Establish a Valid Certification Path to Target

Upon attempting to interact with a secure HTTPS web service, an error message can appear: "PKIX path building failed: unable to find valid certification path to requested target." This indicates an issue with establishing a secure connection due to the unavailability of a valid certification chain.

Understanding the Problem

The PKIX infrastructure is responsible for validating the authenticity of certificates within a TLS/SSL connection. A valid certification path must be established to verify the authenticity of the server and ensure secure communication.

Resolving the Issue

To resolve this error, ensure that the necessary certificate is present in the trust store specified by the Java Virtual Machine (JVM). The JVM uses the trust store to verify the server's certificate chain.

Setting the Keystore

Set the javax.net.ssl.trustStore and javax.net.ssl.trustStorePassword system properties appropriately to specify the location of the trust store and its password. For example:

System.setProperty("javax.net.ssl.trustStore","clientTrustStore.key");
System.setProperty("javax.net.ssl.trustStorePassword","qwerty");

Verifying the Certificate

Confirm that the trust store contains the correct certificate for the target server. If it does not, obtain the server's certificate and import it into the trust store.

Certificate Types

The type of certificate required may vary depending on the target server. For example, some servers may require a CA-signed certificate, while others may accept self-signed certificates. Consult the documentation or administrator of the target server to determine the necessary certificate type.

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