设置静态字段值

# 查看某个类的信息及字段
[arthas@9912]$ sc demo.MathGame -df
 class-info        demo.MathGame
 code-source       /C:/Users/A/.arthas/lib/3.6.7/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@27245100
 classLoaderHash   6d06d69c
 fields            name     random
                   type     java.util.Random
                   modifier private,static
                   value    java.util.Random@3b73462c

                   name     illegalArgumentCount
                   type     int
                   modifier private
# 查看当前静态字段的值
[arthas@9912]$ ognl '@demo.MathGame@random'
@Random[
    serialVersionUID=@Long[3905348978240129619],
    seed=@AtomicLong[146325647347848],
    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[-5237447342009718228],
    nextNextGaussian=@Double[0.0],
    haveNextNextGaussian=@Boolean[false],
    serialPersistentFields=@ObjectStreamField[][isEmpty=false;size=3],
    unsafe=@Unsafe[jdk.internal.misc.Unsafe@1e2957fa],
    seedOffset=@Long[24],
]                   
# 修改静态字段random的值
[arthas@9912]$ ognl '#field=@demo.MathGame@class.getDeclaredField("random"),#field.setAccessible(true),#field.set(null, new java.security.SecureRandom())'
null
# 查看修改后静态字段的值 发现值已经修改成功
[arthas@9912]$ ognl @demo.MathGame@random'
@SecureRandom[
    pdebug=null,
    skipDebug=@Boolean[false],
    provider=@Sun[isEmpty=false;size=140],
    secureRandomSpi=@DRBG[Hash_DRBG,SHA-256,128,reseed_only],
    threadSafe=@Boolean[true],
    algorithm=@String[DRBG],
    seedGenerator=null,
    serialVersionUID=@Long[4940670005562187],
    state=null,
    digest=null,
    randomBytes=null,
    randomBytesUsed=@Integer[0],
    counter=@Long[0],
    serialVersionUID=@Long[3905348978240129619],
    seed=@AtomicLong[0],
    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[-5237447342009718228],
    nextNextGaussian=@Double[0.0],
    haveNextNextGaussian=@Boolean[false],
    serialPersistentFields=@ObjectStreamField[][isEmpty=false;size=3],
    unsafe=@Unsafe[jdk.internal.misc.Unsafe@1e2957fa],
    seedOffset=@Long[24],
]