Arthas 使用

 

1 调用bean中的某个方法：

#抓取 'io.dropwizard.metrics5.ScheduledReporter.report()'
tt -t io.dropwizard.metrics5.ScheduledReporter report params.length==0 -n 1

#tt列表查看
[arthas@1463]$ tt -l
 INDEX       TIMESTAMP                    COST(ms)       IS-RET     IS-EXP      OBJECT                CLASS                                       METHOD                                     
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 1000        2022-03-04 19:44:24          66.333827      true       false       0x35edfcef            GarbageFreeScheduledReporter                report                                     
 1001        2022-03-04 19:58:21          214.109877     true       false       0x46ae7821            GarbageFreeScheduledReporter                report                                     
 1002        2022-03-04 19:58:21          215.242145     true       false       0x46ae7821            InfluxDbReporter                            report                                     
 1003        2022-03-04 20:07:07          8.364167       true       false       0x69ff4845            GarbageFreeScheduledReporter                report                                     
Affect(row-cnt:4) cost in 1 ms.

#查看当前target
[arthas@1463]$ tt -i 1000 -w 'target'
@HickwallUDPReporter[
    logger=@DefaultLogger[com.xxx.framework.foundation.internals.logger.DefaultLogger@2a638bfe],
    DEFAULT_IDC=@String[DEFAULT-IDC],
    LOGGER=@Logger[Logger[io.dropwizard.metrics5.influxdb.InfluxDbReporter]],
    VALUE=@String[value],
    clock=@UserTimeClock[io.dropwizard.metrics5.Clock$UserTimeClock@927d5c],
    sender=@InfluxDbUdpSender[io.dropwizard.metrics5.influxdb.InfluxDbUdpSender@36244462],
    builder=@InfluxDbLineBuilder[io.dropwizard.metrics5.influxdb.InfluxDbLineBuilder@61b7166e],
    registry=@MetricRegistry[io.dropwizard.metrics5.MetricRegistry@57bd4ddd],
    mirror=@RegistryMirror[io.dropwizard.metrics5.influxdb.GarbageFreeScheduledReporter$RegistryMirror@4456b2eb],
    LOG=@Logger[Logger[io.dropwizard.metrics5.ScheduledReporter]],
    FACTORY_ID=@AtomicInteger[3],
    registry=@MetricRegistry[io.dropwizard.metrics5.MetricRegistry@57bd4ddd],
    executor=@DelegatedScheduledExecutorService[java.util.concurrent.Executors$DelegatedScheduledExecutorService@5045e957],
    shutdownExecutorOnStop=@Boolean[true],
    disabledMetricAttributes=@RegularEnumSet[isEmpty=false;size=7],
    scheduledFuture=@ScheduledFutureTask[java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@45c6db93[Not completed, task = java.util.concurrent.Executors$RunnableAdapter@9188157[Wrapped task = io.dropwizard.metrics5.ScheduledReporter$1@34f6f60c]]],
    filter=@[io.dropwizard.metrics5.MetricFilter$1@3ab69d2d],
    durationFactor=@Long[1000000],
    durationUnit=@String[milliseconds],
    rateFactor=@Long[1],
    rateUnit=@String[second],
]

#调用bean 中的stop()方法
tt -i 1000 -w 'target.stop()'

 

2. 调用静态方法

[arthas@4999]$ classloader -t
+-BootstrapClassLoader                                                                                                                                                                       
+-java.net.URLClassLoader@290c8299                                                                                                                                                           
+-javax.management.remote.rmi.NoCallStackClassLoader@12f40c25                                                                                                                                
+-javax.management.remote.rmi.NoCallStackClassLoader@50675690                                                                                                                                
+-org.codehaus.groovy.runtime.callsite.CallSiteClassLoader@9ec3ea7                                                                                                                           
+-org.codehaus.groovy.runtime.callsite.CallSiteClassLoader@4b73612e                                                                                                                          
+-sun.misc.Launcher$ExtClassLoader@66d1af89                                                                                                                                                  
  +-com.taobao.arthas.agent.ArthasClassloader@3c5c2b7b                                                                                                                                       
  +-sun.misc.Launcher$AppClassLoader@18b4aac2                                                                                                                                                
    +-java.net.FactoryURLClassLoader@1e5a1f98                                                                                                                                                
    +-java.net.URLClassLoader@35851384                                                                                                                                                       
                                                                                                                                                                                                                                                                                                  
                                                                                                                                                    
    |   +-com.baidu.bjf.remoting.protobuf.utils.compiler.JdkCompiler$ClassLoaderImpl@12c16acd                                                                                                
    |   +-lombok.launch.ShadowClassLoader@4a84526                                                                                                                                            
    |   +-org.codehaus.groovy.reflection.SunClassLoader@15acdfa8          ///////////////////////////   要找的loader                                                                                                               
    |   +-org.codehaus.groovy.runtime.callsite.CallSiteClassLoader@5ecc0608                                                                                                                  
    |   +-org.codehaus.groovy.runtime.callsite.CallSiteClassLoader@3ca37487                                                                                                                  
    |   +-org.codehaus.groovy.runtime.callsite.CallSiteClassLoader@6609cda5                                                                                                                  
    |   +-org.codehaus.groovy.runtime.callsite.CallSiteClassLoader@5c0a75fa                                                                                                                  
    |   +-org.codehaus.groovy.runtime.callsite.CallSiteClassLoader@588405f2                                                                                                                  
    +-java.net.URLClassLoader@79139cae                                                                                                                                                       
    +-sun.reflect.misc.MethodUtil@4e2cd5a9                                                                                                                                                   
Affect(row-cnt:22) cost in 17 ms.
[arthas@4999]$ 

ognl -c 3a3d901b '@com.ctrip.hotel.search.common.utility.pool.StringBuilderPoolUtils@pool.getNumActive()'
ognl -c 3a3d901b '@com.ctrip.hotel.search.common.utility.pool.StringBuilderPoolUtils@pool.getNumIdle()'

 

转自:

https://arthas.aliyun.com/doc/tt.html （官方手册）
https://github.com/alibaba/arthas/issues/482 （Alibaba Arthas实践--获取到Spring Context）