public Integration addAdditionalEncryptionContextEntry(String key, String value) {
        if (null == this.additionalEncryptionContext) {
            this.additionalEncryptionContext = new com.amazonaws.internal.SdkInternalMap<String, String>();
        }
        if (this.additionalEncryptionContext.containsKey(key))
            throw new IllegalArgumentException("Duplicated keys (" + key.toString() + ") are provided.");
        this.additionalEncryptionContext.put(key, value);
        return this;
    }
Add a single AdditionalEncryptionContext entry

@see Integration#withAdditionalEncryptionContext
@returns a reference to this object so that method calls can be chained together.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/Integration.java