完整的错误信息：
2019-08-22 14:17:59,340 main ERROR Unable to create file ${sys:log.path.prefix}/log.log java.io.IOException: 文件名、目录名或卷标语法不正确。
at java.io.WinNTFileSystem.canonicalize0(Native Method)
at java.io.WinNTFileSystem.canonicalize(Unknown Source)
at java.io.File.getCanonicalPath(Unknown Source)
at java.io.File.getCanonicalFile(Unknown Source)
at org.apache.logging.log4j.core.util.FileUtils.makeParentDirs(FileUtils.java:142)
at org.apache.logging.log4j.core.appender.rolling.RollingFileManager$RollingFileManagerFactory.createManager(RollingFileManager.java:627)
at org.apache.logging.log4j.core.appender.rolling.RollingFileManager$RollingFileManagerFactory.createManager(RollingFileManager.java:608)
at org.apache.logging.log4j.core.appender.AbstractManager.getManager(AbstractManager.java:113)
at org.apache.logging.log4j.core.appender.OutputStreamManager.getManager(OutputStreamManager.java:115)
at org.apache.logging.log4j.core.appender.rolling.RollingFileManager.getFileManager(RollingFileManager.java:188)
at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:144)
at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:60)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:122)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:958)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:898)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:890)
at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:513)
at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:237)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:249)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:545)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:617)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:634)
at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:229)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:153)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194)
at org.apache.commons.logging.LogFactory$Log4jLog.<clinit>(LogFactory.java:199)
at org.apache.commons.logging.LogFactory$Log4jDelegate.createLog(LogFactory.java:166)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:109)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:99)
at org.springframework.boot.SpringApplication.<clinit>(SpringApplication.java:198)
at com.csi.ManagerApplication.main(ManagerApplication.java:17)
2019-08-22 14:17:59,351 main ERROR Could not create plugin of type class org.apache.logging.log4j.core.appender.RollingFileAppender for element RollingFile: java.lang.IllegalStateException: ManagerFactory [org.apache.logging.log4j.core.appender.rolling.RollingFileManager$RollingFileManagerFactory@f736069] unable to create manager for [${sys:log.path.prefix}/log.log] with data [org.apache.logging.log4j.core.appender.rolling.RollingFileManager$FactoryData@6da21078[pattern=${sys:log.path.prefix}/${date:yyyy-MM}/log-%d{yyyy-MM-dd_HH}-%i.log, append=true, bufferedIO=true, bufferSize=8192, policy=CompositeTriggeringPolicy(policies=[TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=true), SizeBasedTriggeringPolicy(size=262144000)]), strategy=DefaultRolloverStrategy(min=1, max=7, useMax=true), advertiseURI=null, layout=[%-d{yyyy-MM-dd HH:mm:ss,SSS}] [%p] [%F:%L] [%c.%M] [%t]: %m%n, filePermissions=null, fileOwner=null]] java.lang.IllegalStateException: ManagerFactory [org.apache.logging.log4j.core.appender.rolling.RollingFileManager$RollingFileManagerFactory@f736069] unable to create manager for [${sys:log.path.prefix}/log.log] with data [org.apache.logging.log4j.core.appender.rolling.RollingFileManager$FactoryData@6da21078[pattern=${sys:log.path.prefix}/${date:yyyy-MM}/log-%d{yyyy-MM-dd_HH}-%i.log, append=true, bufferedIO=true, bufferSize=8192, policy=CompositeTriggeringPolicy(policies=[TimeBasedTriggeringPolicy(nextRolloverMillis=0, interval=1, modulate=true), SizeBasedTriggeringPolicy(size=262144000)]), strategy=DefaultRolloverStrategy(min=1, max=7, useMax=true), advertiseURI=null, layout=[%-d{yyyy-MM-dd HH:mm:ss,SSS}] [%p] [%F:%L] [%c.%M] [%t]: %m%n, filePermissions=null, fileOwner=null]]
at org.apache.logging.log4j.core.appender.AbstractManager.getManager(AbstractManager.java:115)
at org.apache.logging.log4j.core.appender.OutputStreamManager.getManager(OutputStreamManager.java:115)
at org.apache.logging.log4j.core.appender.rolling.RollingFileManager.getFileManager(RollingFileManager.java:188)
at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:144)
at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:60)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:122)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:958)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:898)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:890)
at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:513)
at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:237)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:249)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:545)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:617)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:634)
at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:229)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:153)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194)
at org.apache.commons.logging.LogFactory$Log4jLog.<clinit>(LogFactory.java:199)
at org.apache.commons.logging.LogFactory$Log4jDelegate.createLog(LogFactory.java:166)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:109)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:99)
at org.springframework.boot.SpringApplication.<clinit>(SpringApplication.java:198)
at com.csi.ManagerApplication.main(ManagerApplication.java:17)
2019-08-22 14:17:59,356 main ERROR Unable to invoke factory method in class org.apache.logging.log4j.core.appender.RollingFileAppender for element RollingFile: java.lang.IllegalStateException: No factory method found for class org.apache.logging.log4j.core.appender.RollingFileAppender java.lang.IllegalStateException: No factory method found for class org.apache.logging.log4j.core.appender.RollingFileAppender
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.findFactoryMethod(PluginBuilder.java:229)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:134)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:958)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:898)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:890)
at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:513)
at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:237)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:249)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:545)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:617)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:634)
at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:229)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:153)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194)
at org.apache.commons.logging.LogFactory$Log4jLog.<clinit>(LogFactory.java:199)
at org.apache.commons.logging.LogFactory$Log4jDelegate.createLog(LogFactory.java:166)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:109)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:99)
at org.springframework.boot.SpringApplication.<clinit>(SpringApplication.java:198)
at com.csi.ManagerApplication.main(ManagerApplication.java:17)
2019-08-22 14:17:59,386 main ERROR Null object returned for RollingFile in Appenders.
2019-08-22 14:17:59,393 main ERROR Unable to locate appender "SettleRollingFile" for logger config "SETTLE"由于在配置文件RollingFile 中,日志文件的输出位置，使用了动态配置${sys:log.path.prefix}/log.log，使用eclipse直接启动项目时就会因为没有指定log.path.prefix的参数而报错。
<RollingFile name="SysRollingFile"
fileName="${sys:log.path.prefix}/log.log"
filePattern="${sys:log.path.prefix}/$${date:yyyy-MM}/log-%d{yyyy-MM-dd_HH}-%i.log">
<PatternLayout charset="UTF-8"
pattern="[%-d{yyyy-MM-dd HH:mm:ss,SSS}] [%p] [%F:%L] [%c.%M] [%t]: %m%n" />
<Policies>
<TimeBasedTriggeringPolicy modulate="true" interval="1"/>
<SizeBasedTriggeringPolicy size="250 MB" />
</Policies>
</RollingFile>
解决方法：启动时添加参数即可。eclipse中操作如下
然后apply——》Debug即可。
完整的log4j2.xml内容为：
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="info" monitorInterval="5">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout
pattern="[%-d{yyyy-MM-dd HH:mm:ss,SSS}] [%p] [%F:%L] [%c.%M] [%t]: %m%n" />
</Console>
<RollingFile name="SysRollingFile"
fileName="${sys:log.path.prefix}/log.log"
filePattern="${sys:log.path.prefix}/$${date:yyyy-MM}/log-%d{yyyy-MM-dd_HH}-%i.log">
<PatternLayout charset="UTF-8"
pattern="[%-d{yyyy-MM-dd HH:mm:ss,SSS}] [%p] [%F:%L] [%c.%M] [%t]: %m%n" />
<Policies>
<TimeBasedTriggeringPolicy modulate="true" interval="1"/>
<SizeBasedTriggeringPolicy size="250 MB" />
</Policies>
</RollingFile>
<Syslog charset="UTF-8" name="RFC5424" format="RFC5424" host="10.17.4.20"
port="9999" protocol="UDP" facility="LOCAL0" newLine="true"
messageId="wallet-msg" appName="wallet-app" mdcId="wallet-mdc">
<LoggerFields>
<KeyValuePair key="thread" value="%t" />
<KeyValuePair key="level" value="%p" />
<KeyValuePair key="class" value="%c" />
<KeyValuePair key="method" value="%M" />
<KeyValuePair key="file" value="%F:%L" />
<KeyValuePair key="exception" value="%ex" />
</LoggerFields>
</Syslog>
</Appenders>
<Loggers>
<logger name="SETTLE" level="info" additivity="true">
<AppenderRef ref="SettleRollingFile" />
</logger>
<Root level="info">
<!-- 本地测试可关闭，生产环境打开才能有效备份日志文件 -->
<!-- <AppenderRef ref="SysRollingFile" /> -->
<AppenderRef ref="Console" />
<!-- <AppenderRef ref="RFC5424" /> -->
</Root>
</Loggers>
</Configuration>