When jboss eap installation manager (Prospero) encounters a missing channel metadata error and attempts to display the list of attempted repositories, it crashes with a MissingFormatArgumentException if any repository URL contains percent-encoded characters (e.g., %20 for space).

This bug is not a regression AFAICT.

Reproducer:

prospero.sh \                                                                                                        
    update \                                                                                                                                                                                                                   
    perform \                                               
    --dir=/tmp/server \
    --repositories=file:/home/user/eap%20artifacts/testsuite-maven-repository/local-maven-repository/

Expected: Error message about missing metadata
Actual: java.util.MissingFormatArgumentException: Format specifier '%20a'

Root Cause

The CliConsole.error(String message, String... args) method at line 267 calls String.format(message, args):

public void error(String message, String... args)

When ExecutionExceptionHandler.printRepositories() (line 204) passes repository URLs containing percent characters to console.error(), Java's String.format() interprets sequences like %20a as format specifiers. Since no corresponding argument exists, it throws MissingFormatArgumentException.

Affected code path:

  ExecutionExceptionHandler.printRepositories() (line 204)
    → console.error("  *" + repo + ...)  // repo contains URL with %20
      → CliConsole.error() (line 267)
        → String.format(message, args)  // %20a interpreted as format specifier
          → MissingFormatArgumentException

User Impact:

• Users cannot see which repositories were attempted when resolution fails
• Error messages are obscured by secondary exceptions
• Any repository URL containing % followed by certain characters will trigger this bug
• Common scenarios: Windows paths with spaces (C:\Program Files), URLs with encoded characters

Workaround:
Do not use repositories with a space in path

Proposed Solution
Escape percent characters in repository URLs before passing to console.error():

  String escapedRepo = repo.replace("%", "%%");
  console.error("  *" + escapedRepo + ...);