Unified JVM Logging [JEP 158]

Creating a unified logging schema for the JVM was the central goal of JEP-158. Here is a comprehensive list of the goals of the JEP:

• Create a JVM-wide set of command-line options for all logging operations
• Use categorized tags for logging
• Permit messages to have multiple tags, also referred to as tag sets
• Provide six levels of logging:
  • Error
  • Warning
  • Information
  • Debug
  • Trace
  • Develop
• Select which messages are logged based on levels
• Optionally direct logging to the console or a file
  • Print one line at a time and do not support interleaving within the same line
• Permit output of multiple line logs (non-interleaved)
• Format all logging messages so that they are easily human-read
• Add decorations such as uptime, level, and tags
• Like levels, select which messages are logged based on decorations
• Convert pre-Java 9 tty>print logging to use unified logging as the output
• Permit dynamic message configuration using jcmd and MBeans
• Permit the ability to enable and disable individual log messages...