PKIX path building failed:

[tessari]

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It produced this output:

nested exception is:
javax.net.ssl.SSLHandshakeException: com.ibm.jsse2.util.h: PKIX path building failed: java.security.cert.CertPathBuilderException: PKIXCertPathBuilderImpl could not build a valid CertPath.; internal cause is:
java.security.cert.CertPathValidatorException: The certificate issued by CN=DST Root CA X3, O=Digital Signature Trust Co. is not trusted; internal cause is:
java.security.cert.CertPathValidatorException: Certificate chaining error

[stevenzhu]

Hi,

What are you trying to do?

Thank you

[schoen]

This usually means that you’re missing the intermediate certificate, which is currently one of these

Chain of Trust - Let's Encrypt - Free SSL/TLS Certificates

and is automatically provided to the Let’s Encrypt client when the certificate is issued (Certbot, for example, saves it into chain.pem and also fullchain.pem).

As @stevenzhu’s question indicates, we can’t help you further unless we understand more context about your problem.