Importing a .p7b (PKCS#7) certificate bundle into a Java keystore using keytool fails because keytool expects a single X.509 certificate, not a container format. The solution involves using OpenSSL to convert the .p7b bundle to PEM format, then importing each certificate individually with keytool using distinct aliases. The tutorial walks through downloading a certificate chain, creating a .p7b bundle, diagnosing the import error, converting to PEM, and verifying the final keystore contains all three certificates.
Table of contents
1. Introduction2. Understanding the P7B (PKCS#7) Format3. Preparing a P7B file4. Importing the P7B file5. ConclusionSort: