Java プログラムをデバッグする時に便利なトレース・ログ出力ライブラリの紹介

repositories {
    jcenter()
}

dependencies {
    compile 'org.debugtrace:debugtrace:2.+'
}

    public static void main(String[] args) {
        DebugTrace.enter();
        DebugTrace.print("args", args);
            ...
        DebugTrace.leave();
    }

# 以下のいずれかを指定
logger = Jdk
logger = Log4j
logger = Log4j2
logger = SLF4J
logger = Std$Out
logger = Std$Err

handlers = java.util.logging.ConsoleHandler
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
java.util.logging.SimpleFormatter.format = [Jdk] %1$tY-%1$tm-%1$td %1$tH:%1$tM:%1$tS.%1$tL %5$s%n
java.util.logging.ConsoleHandler.level = FINEST
org.debugtrace.DebugTrace.level = FINEST

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false">
  <appender name="Console" class="org.apache.log4j.ConsoleAppender">
    <param name="Target" value="System.out"/>
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern" value="[Log4j] %d{yyyy-MM-dd HH:mm:ss.SSS} %5p %m%n"/>
    </layout>
  </appender>
  <logger name="org.debugtrace.DebugTrace">
    <level value ="trace"/>
    <appender-ref ref="Console"/>
  </logger>
</log4j:configuration>

<?xml version="1.0" encoding="UTF-8"?>
<configuration status="WARN">
  <appenders>
    <Console name="Console" target="SYSTEM_OUT">
      <PatternLayout pattern="[Log4j2] %d{yyyy-MM-dd HH:mm:ss.SSS} %5p %msg%n"/>
    </Console>
  </appenders>
  <loggers>
    <logger name="org.debugtrace.DebugTrace" level="trace"/>
    <root level="error"><appender-ref ref="Console"/></root>
  </loggers>
</configuration>

<configuration>
  <appender name="Console" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>[SLF4J logback] %d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %msg%n</pattern>
    </encoder>
  </appender>
  <logger name="org.debugtrace.DebugTrace" level="trace"/>
  <root level="error"><appender-ref ref="Console"/></root>
</configuration>

defaultPackage = org.debugtrace.

nonPrintProperties.0 = org.debugtrace.example.entity.Phone#contact
nonPrintProperties.1 = org.debugtrace.example.entity.Address#contact
...