To understand the meaning of, and to solve the
"Error while executing custom wrapper method 'getSchemaParameters': javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target"
error, please refer to the previously answered Community question [here](https://community.denodo.com/answers/question/details?questionId=906Du00000000iZIAQ&title=TCP%2FIP+connection+failed).
You need to use the OData2 Custom Wrapper if you are using/consuming the OData2 or OData3 protocol. Else, use the OData4 Custom Wrapper to consume the OData4 protocol service. You should refer to the [Denodo OData2 Custom Wrapper - User Manual](https://community.denodo.com/docs/html/document/denodoconnects/8.0/en/Denodo%20OData2%20Custom%20Wrapper%20-%20User%20Manual#h.uthsc1fg8h93) for more information.
Hope this helps!