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This article provides an in-depth analysis of the CertificateException error that occurs in Java applications during HTTPS connections. It explores SSL certificate validation mechanisms, the role of Subject Alternative Names (SAN), and presents multiple solutions. The focus is on disabling SSL verification through custom TrustManager and HostnameVerifier implementations, while discussing best practices and alternative approaches for production environments. Through code examples and principle analysis, developers gain comprehensive understanding of this common secure connection issue.