dump

dump 已加载类的 bytecode 到特定目录

参数说明

参数名称 参数说明
class-pattern 类名表达式匹配
[c:] 类所属 ClassLoader 的 hashcode
[E] 开启正则表达式匹配，默认为通配符匹配

使用参考

  1. $ dump -E org\.apache\.commons\.lang\.StringUtils
  2.  HASHCODE  CLASSLOADER                                                        LOCATION
  3.  29505d69  +-tddl-client's ModuleClassLoader                                  /Users/zhuyong/middleware/taobao-tomcat/output/build/bin/classdump/com.taobao.pandora
  4.                                                                               .service.loader.ModuleClassLoader-29505d69/org.apache.commons.lang.StringUtils.class
  5.  6e51ad67  +-java.net.URLClassLoader@6e51ad67                                 /Users/zhuyong/middleware/taobao-tomcat/output/build/bin/classdump/java.net.URLClassL
  6.              +-sun.misc.Launcher$AppClassLoader@6951a712                      oader-6e51ad67/org.apache.commons.lang.StringUtils.class
  7.                +-sun.misc.Launcher$ExtClassLoader@6fafc4c2
  8.  2bdd9114  +-pandora-qos-service's ModuleClassLoader                          /Users/zhuyong/middleware/taobao-tomcat/output/build/bin/classdump/com.taobao.pandora
  9.                                                                               .service.loader.ModuleClassLoader-2bdd9114/org.apache.commons.lang.StringUtils.class
  10.  544dc9ba  +-com.taobao.tomcat.container.context.loader.AliWebappClassLoader  /Users/zhuyong/middleware/taobao-tomcat/output/build/bin/classdump/com.taobao.tomcat.
  11.              +-org.apache.catalina.loader.StandardClassLoader@2302e984        container.context.loader.AliWebappClassLoader-544dc9ba/org.apache.commons.lang.String
  12.                +-sun.misc.Launcher$AppClassLoader@6951a712                    Utils.class
  13.                  +-sun.misc.Launcher$ExtClassLoader@6fafc4c2
  14.  22880c2b  +-java.net.URLClassLoader@22880c2b                                 /Users/zhuyong/middleware/taobao-tomcat/output/build/bin/classdump/java.net.URLClassL
  15.              +-sun.misc.Launcher$AppClassLoader@6951a712                      oader-22880c2b/org.apache.commons.lang.StringUtils.class
  16.                +-sun.misc.Launcher$ExtClassLoader@6fafc4c2
  17. Affect(row-cnt:5) cost in 156 ms.
  18. $ dump -E org\.apache\.commons\.lang\.StringUtils -c 22880c2b
  19.  HASHCODE  CLASSLOADER                                      LOCATION
  20.  22880c2b  +-java.net.URLClassLoader@22880c2b               /Users/zhuyong/middleware/taobao-tomcat/output/build/bin/classdump/java.net.URLClassLoader-22880c2b/org
  21.              +-sun.misc.Launcher$AppClassLoader@6951a712    .apache.commons.lang.StringUtils.class
  22.                +-sun.misc.Launcher$ExtClassLoader@6fafc4c2
  23. Affect(row-cnt:1) cost in 67 ms.

原文: https://alibaba.github.io/arthas/dump.html