[WICKET-6345] Check for non-null PushBuilder before trying to use it

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 8.0.0-M4
• Fix Version/s: 8.0.0-M5
• Component/s: wicket-http2
• Assignee: Martin Tzvetanov Grigorov
• Reporter: Martin Tzvetanov Grigorov
• Created: 23/Mar/17 16:09
• Updated: 23/Mar/17 16:29
• Resolved: 23/Mar/17 16:10

Description

According to the latest Servlet 4 development the Web container should return null when HTTP2 Push is not supported for the current request.

Wicket PushBuilder abstractions should take this into account to avoid failing with NullPointerException.