Apt Get Install Pin Version Not Defined @ /Dockerfile

[margaritalm]

Checkmarx (IaC-Security): Apt Get Install Pin Version Not Defined
Checkmarx Project: margaritalm/BookStore_Small_CLI_small
Repository URL: https://github.com/margaritalm/BookStore_Small_CLI_small
Branch: master
Scan ID: 79dde67e-447e-480d-9f9e-f0bfb2e3e6f8

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When installing a package, its pin version should be defined

Locations:

Result #1:
Severity: MEDIUM
State: TO_VERIFY
Status: RECURRENT
    File: /Dockerfile[5,0]
    Expected value: Package 'default-jdk' has version defined
    Actual value: Package 'default-jdk' does not have version defined
    Review result in Checkmarx One: Apt Get Install Pin Version Not Defined