How to access both DocumentDB and S3 in the same Java program

Question

Hello,  
  
I have a Java Spring Boot 2 application that needs to connect to both DocumentDB and S3.  
  
As stated on https://docs.aws.amazon.com/documentdb/latest/developerguide/connect_programmatically.html I downloaded rds-combined-ca-bundle.pem, created a truststore and specified the system parameter javax.net.ssl.trustStore. As a result I can connect to DocumentDB with TLS but when I connect to S3 using the java SDK I now get   
  
com.amazonaws.SdkClientException: Unable to execute HTTP request: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target  
in  
com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:4365)  
  
Does anyone knows how to connect to DocumentDB and other endpoints that needs SSL in a Java program?  
I tried specifying the pem file on the MongoDB URI but the parameter ssl_ca_certs is not known by the driver.

Answer

Hi. You can update the  trustStore created for DocumentDB and add the AWS Truststore CA certificates - see `keytool -importkeystore` along with this [blog](https://aws.amazon.com/blogs/security/how-to-prepare-for-aws-move-to-its-own-certificate-authority/).
The certificates can be found [here](https://www.amazontrust.com/repository/).

How to access both DocumentDB and S3 in the same Java program

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