启用 TimeBasedTriggeringPolicy 时 Log4j2-RollingFile 不写入

Question

Log4j2 无法读取 RollingFile Appender 的 filePattern 中的日期。当我添加 TimeBasedTriggeringPolicy 并重新配置我的配置文件时，我收到此错误：

“错误无法将字段注入到插件类型类 org.apache.logging.log4j.core.appender.RollingFileAppender、元素 RollingFile 的构建器类中。java.lang.IllegalStateException：模式不包含日期”

我在 log4j2 代码中放置了一个断点，发现原因是频率变量是PatternProcessor object is null. 我不知道为什么这是 null 或如何将其设置为 null 以外的其他值。

如果我注释掉TimeBasedTriggeringPolicy，附加程序开始工作并将日志写入我的文件。

以下是我的 POM 中的 log4j 依赖项：

<dependency>
  <groupId>org.apache.logging.log4j</groupId>
  <artifactId>log4j-api</artifactId>
  <version>2.7</version>
</dependency>
<dependency>
  <groupId>org.apache.logging.log4j</groupId>
  <artifactId>log4j-core</artifactId>
  <version>2.7</version>
</dependency>
<dependency>
  <groupId>org.apache.logging.log4j</groupId>
  <artifactId>log4j-slf4j-impl</artifactId>
  <version>2.7</version>
</dependency>
<dependency>
  <groupId>org.apache.logging.log4j</groupId>
  <artifactId>log4j-web</artifactId>
  <version>2.6.2</version>
</dependency>
<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>jcl-over-slf4j</artifactId>
  <version>1.7.7</version>
</dependency>
<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-api</artifactId>
  <version>1.7.7</version>
</dependency>

这是我的 log4j2.xml 文件：

<?xml version="1.0" encoding="UTF-8"?>
<Configuration monitorInterval="30" status="DEBUG">
    <Properties>
        <Property name="baseDir">/logs/oracle/domains/cim</Property>
    </Properties>
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%highlight{%d{DEFAULT} [%t] %-5p %c -%m%n}"/>
        </Console>
        <RollingFile name="RollingFile" fileName="${baseDir}/cim.log"
            filePattern="${baseDir}/cim-%d{yyyy-MM-dd}.log" append="true">
            <PatternLayout pattern="%d{DEFAULT} %-5p %c - %m%n"/>
            <Policies>
                <TimeBasedTriggeringPolicy interval="1" modulate="true"/>
                <SizeBasedTriggeringPolicy size="10 MB" />
            </Policies>
            <DefaultRolloverStrategy max="31"/>
        </RollingFile>
    </Appenders>
  <Loggers>
    <Logger name="com.cim" level="debug" additivity="true">
        <Appender-Ref ref="RollingFile"/>
    </Logger>
    <Root level="debug" additivity="false">
        <Appender-Ref ref="Console"/>
    </Root>
  </Loggers>
</Configuration>

这是上面错误消息之后的初始堆栈跟踪：

at org.apache.logging.log4j.core.appender.rolling.PatternProcessor.getNextTime(PatternProcessor.java:119)
    at org.apache.logging.log4j.core.appender.rolling.TimeBasedTriggeringPolicy.initialize(TimeBasedTriggeringPolicy.java:59)
    at org.apache.logging.log4j.core.appender.rolling.CompositeTriggeringPolicy.initialize(CompositeTriggeringPolicy.java:52)
    at org.apache.logging.log4j.core.appender.rolling.RollingFileManager.setTriggeringPolicy(RollingFileManager.java:216)
    at org.apache.logging.log4j.core.appender.rolling.RollingFileManager.updateData(RollingFileManager.java:439)
    at org.apache.logging.log4j.core.appender.AbstractManager.getManager(AbstractManager.java:119)
    at org.apache.logging.log4j.core.appender.OutputStreamManager.getManager(OutputStreamManager.java:114)
    at org.apache.logging.log4j.core.appender.rolling.RollingFileManager.getFileManager(RollingFileManager.java:128)
    at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:135)
    at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:58)
    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:942)
    at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:882)
    at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:874)
    at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:498)
    at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:227)
    at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:239)
    at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:530)
    at org.apache.logging.log4j.core.LoggerContext.onChange(LoggerContext.java:653)
    at org.apache.logging.log4j.core.config.ConfiguratonFileWatcher$ReconfigurationRunnable.run(ConfiguratonFileWatcher.java:65)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

Answer 1

错误消息“模式不包含日期”显然是错误的，因为您的模式是filePattern="${baseDir}/cim-%d{yyyy-MM-dd}.log"，它确实包含日期

然而，这个模式有一个问题。您确实指定了两种触发策略，一种基于日期的策略和一种基于大小的策略。

具体来说，还SizeBasedTriggeringPolicy需要 filePattern 中的某些内容%i，因为当此策略触发时，它需要将文件重命名为某些内容。

使用基于大小的策略，您通常会得到一堆滚动的日志文件，如下所示：

app-1.log
app-2.log
app-3.log
...

filePattern 需要包含一个%i转换模式，以告诉 Log4j2 将计数器放在哪里，否则它将无法重命名文件。