getstatic
- 推荐直接使用ognl命令,更加灵活。
通过getstatic命令可以方便的查看类的静态属性。使用方法为getstatic class_name field_name
$ getstatic demo.MathGame random
field: random
@Random[
serialVersionUID=@Long[3905348978240129619],
seed=@AtomicLong[120955813885284],
multiplier=@Long[25214903917],
addend=@Long[11],
mask=@Long[281474976710655],
DOUBLE_UNIT=@Double[1.1102230246251565E-16],
BadBound=@String[bound must be positive],
BadRange=@String[bound must be greater than origin],
BadSize=@String[size must be non-negative],
seedUniquifier=@AtomicLong[-3282039941672302964],
nextNextGaussian=@Double[0.0],
haveNextNextGaussian=@Boolean[false],
serialPersistentFields=@ObjectStreamField[][isEmpty=false;size=3],
unsafe=@Unsafe[sun.misc.Unsafe@2eaa1027],
seedOffset=@Long[24],
]
如果该静态属性是一个复杂对象,还可以支持在该属性上通过ognl表示进行遍历,过滤,访问对象的内部属性等操作。
- OGNL特殊用法请参考:https://github.com/alibaba/arthas/issues/71
- OGNL表达式官方指南:https://commons.apache.org/proper/commons-ognl/language-guide.html
例如,假设n是一个Map,Map的Key是一个Enum,我们想过滤出Map中Key为某个Enum的值,可以写如下命令
$ getstatic com.alibaba.arthas.Test n 'entrySet().iterator.{? #this.key.name()=="STOP"}'
field: n
@ArrayList[
@Node[STOP=bbb],
]
Affect(row-cnt:1) cost in 68 ms.
$ getstatic com.alibaba.arthas.Test m 'entrySet().iterator.{? #this.key=="a"}'
field: m
@ArrayList[
@Node[a=aaa],
]