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Technically speaking you can create a new project from scratch without namespaces. This is assuming you are not going to be running in an ecosystem that require

• koko775 14y ago
  This is a fair point but an API is -always- going to be running in an ecosystem. If it's the Java ecosystem, not using a namespace flies in the face of tens or hundreds of thousands of people's conception of common convention. Which is most definitely not wise, even if src/main/java/reverse/dns/namespace is aesthetically unpleasing to some. Things like the Play! Framework can get away with it because the framework is basically an exoskeleton around the Java code rather than a traditional container.