Graalvm aot中logback的处理和自动重载

官方说明：Logging in Native Image (graalvm.org)

我使用graalvm-community-jdk-21.0.1_windows-x64_bin.zip,解压后配置好JAVA_HOME和PATH，安装 C++，就可以直接使用，不需要复杂的匹配过程

日志这一块卡了很长时间，最后的方法是在application.yml中启用日志

然后编译时，会自动根据XML中的内容去判断反射的类，生成相关的引用信息，不需要自己在编译参数中增加内容

@@@code

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.2.1</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
 
<properties>
<maven.compiler.source>21</maven.compiler.source>
<maven.compiler.target>21</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
 
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
 
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
 
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>                                                                                                                         
                                                                                                                                     
                                                                                                                                  
                     
              
          
     
   
   
   
<plugin>
<groupId>org.graalvm.buildtools</groupId>
<artifactId>native-maven-plugin</artifactId>
<configuration>
<skip>false</skip>
<buildArgs>
--no-fallback
<!-- &#45;&#45;initialize-at-build-time=io.netty-->
<!-- &#45;&#45;initialize-at-run-time=org.apache.logging.log4j.spi.Provider-->
<!-- &#45;&#45;initialize-at-build-time=ch.qos.logback-->
<!-- &#45;&#45;initialize-at-build-time=org.springframework.util.unit.DataSize-->
<!-- &#45;&#45;initialize-at-build-time=org.slf4j.MDC-->
<!-- &#45;&#45;initialize-at-build-time=ch.qos.logback.classic.Level-->
<!-- &#45;&#45;initialize-at-build-time=ch.qos.logback.classic.Logger-->
<!-- &#45;&#45;initialize-at-build-time=ch.qos.logback.core.util.StatusPrinter-->
<!-- &#45;&#45;initialize-at-build-time=ch.qos.logback.core.status.StatusBase-->
<!-- &#45;&#45;initialize-at-build-time=ch.qos.logback.core.status.InfoStatus-->
<!-- &#45;&#45;initialize-at-build-time=ch.qos.logback.core.spi.AppenderAttachableImpl-->
<!-- &#45;&#45;initialize-at-build-time=org.slf4j.LoggerFactory-->
<!-- &#45;&#45;initialize-at-build-time=ch.qos.logback.core.util.Loader-->
<!-- &#45;&#45;initialize-at-build-time=org.slf4j.impl.StaticLoggerBinder-->
<!-- &#45;&#45;initialize-at-build-time=ch.qos.logback.classic.spi.ThrowableProxy-->
<!-- &#45;&#45;initialize-at-build-time=ch.qos.logback.core.CoreConstants-->
--report-unsupported-elements-at-runtime
--allow-incomplete-classpath
-H:+ReportExceptionStackTraces
</buildArgs>
</configuration>
</plugin>                                                 
                                                             
                                                          
                     
              
          
     
   
   
   

@@#

这种方法得到的EXE，logback已经提前编译并匹配好了，可以直接使用,但会发现不会再接受外部指定的logging.config了，即使修改了logback-spring.xml中的内容，也不会生效。

为了再次更新配置，并使用scan功能，需要使用代码重新配置一次（配置可从application.yml中直接取，也可以使用-Dlogging.config=file:../config/logback-spring.xml重新指定位置，

@@@code@java@

LoggerContext loggerContext = (LoggerContext)LoggerFactory.getILoggerFactory();
//AOT不支持scan autoload ,并且在编译时确定了日志等级，也不支持外部文件覆盖配置，需要手工判断文件并重新载入
if (!reloaded.get())
{
    loggerContext.reset();
    JoranConfigurator configurator = new JoranConfigurator();
    configurator.setContext(loggerContext);
    configurator.doConfigure(new URL(env.getProperty("logging.config")));
    log.warn("重新加载日志配置{}", env.getProperty("logging.config"));
    reloaded.set(true);
}
 
ch.qos.logback.classic.Logger rootLogger = loggerContext.getLogger(Logger.ROOT_LOGGER_NAME);
if (rootLogger != null)
    System. out .
println("root level=" + rootLogger.getLevel());