sc
查看jvm已加载的类信息(Search Class简写)
| 命令选项 | 描述 |
|---|---|
| -c, --classloader <hash> | 指定ClassLoader的哈希值 |
| --classLoaderClass <class-name> | 指定ClassLoader的类名 |
| -cs, --classLoaderStr <class-str> | 指定class的ClassLoader#toString() 返回值 |
| -d, --details | 输出当前类的详细信息，包括这个类所加载的原始文件来源、类的声明、加载的 ClassLoader 等详细信息。 如果一个类被多个 ClassLoader 所加载，则会出现多次 |
| -x, --expand <level> | 指定输出静态变量时属性的遍历深度，默认为0 |
| -f, --feild | 列出所有成员字段，需要配合-d使用 |
| -n, --limits <number> | 最大匹配类数量展示，默认100 |
| -E, --regex | 开启正则匹配，默认是通配符匹配 |
| -h, --help | 帮助 |
| <class-pattern> | 类匹配模式 |
示例
# 查看类详情
[arthas@13728]$ sc -d demo.MathGame
class-info demo.MathGame
code-source /C:/Users/A/.arthas/lib/3.6.6/arthas/math-game.jar
name demo.MathGame
isInterface false
isAnnotation false
isEnum false
isAnonymousClass false
isArray false
isLocalClass false
isMemberClass false
isPrimitive false
isSynthetic false
simple-name MathGame
modifier public
annotation
interfaces
super-class +-java.lang.Object
class-loader +-jdk.internal.loader.ClassLoaders$AppClassLoader@6d06d69c
+-jdk.internal.loader.ClassLoaders$PlatformClassLoader@6a056a05
classLoaderHash 6d06d69c
Affect(row-cnt:1) cost in 4 ms.
# 查看类详情、字段
[arthas@13728]$ sc -df demo.MathGame
class-info demo.MathGame
code-source /C:/Users/A/.arthas/lib/3.6.6/arthas/math-game.jar
name demo.MathGame
isInterface false
isAnnotation false
isEnum false
isAnonymousClass false
isArray false
isLocalClass false
isMemberClass false
isPrimitive false
isSynthetic false
simple-name MathGame
modifier public
annotation
interfaces
super-class +-java.lang.Object
class-loader +-jdk.internal.loader.ClassLoaders$AppClassLoader@6d06d69c
+-jdk.internal.loader.ClassLoaders$PlatformClassLoader@6a056a05
classLoaderHash 6d06d69c
fields name random
type java.util.Random
modifier private,static
value java.util.Random@177eabd5
name illegalArgumentCount
type int
modifier private
Affect(row-cnt:1) cost in 3 ms.
# 展开静态字段层级
[arthas@13728]$ sc -dfx 2 demo.MathGame
class-info demo.MathGame
code-source /C:/Users/A/.arthas/lib/3.6.6/arthas/math-game.jar
name demo.MathGame
isInterface false
isAnnotation false
isEnum false
isAnonymousClass false
isArray false
isLocalClass false
isMemberClass false
isPrimitive false
isSynthetic false
simple-name MathGame
modifier public
annotation
interfaces
super-class +-java.lang.Object
class-loader +-jdk.internal.loader.ClassLoaders$AppClassLoader@6d06d69c
+-jdk.internal.loader.ClassLoaders$PlatformClassLoader@6a056a05
classLoaderHash 6d06d69c
fields name random
type java.util.Random
modifier private,static
value @Random[
serialVersionUID=@Long[3905348978240129619],
seed=@AtomicLong[
serialVersionUID=@Long[1927816293512124184],
VM_SUPPORTS_LONG_CAS=@Boolean[true],
U=@Unsafe[jdk.internal.misc.Unsafe@374742d3],
VALUE=@Long[16],
value=@Long[123332722620040],
serialVersionUID=@Long[-8742448824652078965],
],
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[
serialVersionUID=@Long[1927816293512124184],
VM_SUPPORTS_LONG_CAS=@Boolean[true],
U=@Unsafe[jdk.internal.misc.Unsafe@374742d3],
VALUE=@Long[16],
value=@Long[9105146733113736444],
serialVersionUID=@Long[-8742448824652078965],
],
nextNextGaussian=@Double[0.0],
haveNextNextGaussian=@Boolean[false],
serialPersistentFields=@ObjectStreamField[][
@ObjectStreamField[J seed],
@ObjectStreamField[D nextNextGaussian],
@ObjectStreamField[Z haveNextNextGaussian],
],
unsafe=@Unsafe[
seedOffset=@Long[24],
]
name illegalArgumentCount
type int
modifier private
Affect(row-cnt:1) cost in 15 ms.
提示
- class-pattern 支持全限定名，如 com.taobao.test.AAA，也支持 com/taobao/test/AAA 这样的格式
- sc默认开启了子类匹配功能(dump命令也一样)，也就是说所ss有当前类的子类也会被搜索出来，想要精确的匹配，请打开options disable-sub-class true开关