Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "At the backend, modify the save method of ProductOrderService.java to create an Invoice and Shipment for the ProductOrder and save them all."

A block of code is set as follows:

entity Product {
    name String required
    description String
    price BigDecimal required min(0)
    size Size required
    image ImageBlob
}

enum Size {
    S, M, L, XL, XXL
}

entity ProductCategory {
    name String required
    description String
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

entity ProductOrder {
    placedDate Instant required
    status OrderStatus required
    invoiceId Long
    code String required
}

Any command-line input or output is written as follows:

> cd invoice
> ./gradlew

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "You can alternatively test this via your Gateway application. Log in to    our Gateway application and then navigate to Administration | Gateway."