When loading a sample project in first use of StreamBase Studio after a new install, I get design time error in the POM.xml editor:
  Project build error: Unknown packaging: ep-application

The StreamBase SDK has not been completely copied into your local Maven repository (C:\Users\{user}\.m2\repository). Normally SB Studio takes some time at startup to check that the TIBCO Streaming libraries are in the repository and if any are not there, copy them. 

If you take actions immediately in Studio that depend on these libraries and artifacts before this completes, you may see this error.

One other requirement is that you have network access to download from Maven Central (https://repo.maven.apache.org/maven2) or a mirror such as (http://uk.maven.org/maven2). For more information about how to configure to use a mirror, please see KB article:
  https://support.tibco.com/s/article/How-to-configure-your-StreamBase-10-Studio-environment-for-offline-development

To copy the SDK into the Maven repository using command-line utilities, please do the following:
1. Open a StreamBase Command Window and run:  
  epdev install maven --for-studio
2. After the above command completes, open SB Studio 
3. In SB Studio, right-click your project and use the two menu commands:  
  Run as > Maven clean
  Maven > Update Project

How to correct Studio error: Unknown packaging