[LOG4J2-2243] Cannot see or copy all of certain JAnsi exception messages on Windows due to NUL characters

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.11.0, 3.0.0
• Component/s: Appenders
• Assignee: Gary D. Gregory
• Reporter: Gary D. Gregory
• Created: 09/Feb/18 04:01
• Updated: 09/Feb/18 04:09
• Resolved: 09/Feb/18 04:09

Description

Using JAnsi in some cases (like in Eclipse) can cause Log4j's status logger to log the following:

2018-02-08 20:57:05,256 main WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream due to java.io.IOException: Could not get the screen info: T h e   h a n d l e   i s   i n v a l i d .

The problem is that the spaces in the string "T h e h a n d l e i s i n v a l i d ." are NUL (0) characters. If you copy a whole console, then when you paste, the text you get will stop at the first NUL (0).

This fix simply replaces NUL characters with SPACEs in the one place where we try to initialize JAnsi.