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Affect< span class = "token punctuation" > (< / span > class-cnt:1 , method-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 66< / span > ms.
INDEX TIMESTAMP COST< span class = "token punctuation" > (< / span > ms< span class = "token punctuation" > )< / span > IS-RET IS-EXP OBJECT CLASS METHOD
-------------------------------------------------------------------------------------------------------------------------------------
< span class = "token number" > 1000< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:38 < span class = "token number" > 1.096236< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1001< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:39 < span class = "token number" > 0.191848< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1002< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:40 < span class = "token number" > 0.069523< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1003< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:41 < span class = "token number" > 0.186073< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1004< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:42 < span class = "token number" > 17.76437< / span > < span class = "token boolean" > true< / span > < span class = "token boolean" > false< / span > 0x4b67cf4d MathGame primeFactors
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > < p > 命令参数解析< / p > < ul > < li > < p > < code > -t< / code > < / p > < p > tt 命令有很多个主参数，< code > -t< / code > 就是其中之一。这个参数的表明希望记录下类 < code > *Test< / code > 的 < code > print< / code > 方法的每次执行情况。< / p > < / li > < li > < p > < code > -n 3< / code > < / p > < p > 当你执行一个调用量不高的方法时可能你还能有足够的时间用 < code > CTRL+C< / code > 中断 tt 命令记录的过程，但如果遇到调用量非常大的方法，瞬间就能将你的 JVM 内存撑爆。< / p > < p > 此时你可以通过 < code > -n< / code > 参数指定你需要记录的次数，当达到记录次数时 Arthas 会主动中断 tt 命令的记录过程，避免人工操作无法停止的情况。< / p > < / li > < / ul > < / li > < li > < p > 表格字段说明< / p > < / li > < / ul > < table > < thead > < tr > < th > 表格字段< / th > < th > 字段解释< / th > < / tr > < / thead > < tbody > < tr > < td > INDEX< / td > < td > 时间片段记录编号，每一个编号代表着一次调用，后续 tt 还有很多命令都是基于此编号指定记录操作，非常重要。< / td > < / tr > < tr > < td > TIMESTAMP< / td > < td > 方法执行的本机时间，记录了这个时间片段所发生的本机时间< / td > < / tr > < tr > < td > COST(ms)< / td > < td > 方法执行的耗时< / td > < / tr > < tr > < td > IS-RET< / td > < td > 方法是否以正常返回的形式结束< / td > < / tr > < tr > < td > IS-EXP< / td > < td > 方法是否以抛异常的形式结束< / td > < / tr > < tr > < td > OBJECT< / td > < td > 执行对象的< code > hashCode()< / code > ，注意，曾经有人误认为是对象在 JVM 中的内存地址，但很遗憾他不是。但他能帮助你简单的标记当前执行方法的类实体< / td > < / tr > < tr > < td > CLASS< / td > < td > 执行的类名< / td > < / tr > < tr > < td > METHOD< / td > < td > 执行的方法名< / td > < / tr > < / tbody > < / table > < ul > < li > < p > 条件表达式< / p > < p > 不知道大家是否有在使用过程中遇到以下困惑< / p > < ul > < li > Arthas 似乎很难区分出重载的方法< / li > < li > 我只需要观察特定参数，但是 tt 却全部都给我记录了下来< / li > < / ul > < p > 条件表达式也是用 < code > < / code > 来编写，核心的判断对象依然是 < code > Advice< / code > 对象。除了 < code > tt< / code > 命令之外，< code > watch< / code > 、< code > trace< / code > 、< code > stack< / code > 命令也都支持条件表达式。< / p > < / li > < li > < p > 解决方法重载< / p > < p > < code > tt -t *Test print params.length==1< / code > < / p > < p > 通过制定参数个数的形式解决不同的方法签名，如果参数个数一样，你还可以这样写< / p > < p > < code > tt -t *Test print ' params[1] instanceof Integer' < / code > < / p > < / li > < li > < p > 解决指定参数< / p > < p > < code > tt -t *Test print params[0].mobile==" 13989838402" < / code > < / p > < / li > < li > < p > 构成条件表达式的 < code > Advice< / code > 对象< / p > < p > 前边看到了很多条件表达式中，都使用了 < code > params[0]< / code > ，有关这个变量的介绍，请参考< a href = "/doc/advice-class.html" class = "" > 表达式核心变量< / a > < / p > < / li > < / ul > < h4 id = "检索调用记录" tabindex = "-1" > < a class = "header-anchor" href = "#检索调用记录" aria-hidden = "true" > #< / a > 检索调用记录< / h4 > < p > 当你用 < code > tt< / code > 记录了一大片的时间片段之后，你希望能从中筛选出自己需要的时间片段，这个时候你就需要对现有记录进行检索。< / p > < p > 假设我们有这些记录< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ tt -l
INDEX TIMESTAMP COST< span class = "token punctuation" > (< / span > ms< span class = "token punctuation" > )< / span > IS-RET IS-EXP OBJECT CLASS METHOD
-------------------------------------------------------------------------------------------------------------------------------------
< span class = "token number" > 1000< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:38 < span class = "token number" > 1.096236< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1001< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:39 < span class = "token number" > 0.191848< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1002< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:40 < span class = "token number" > 0.069523< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1003< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:41 < span class = "token number" > 0.186073< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1004< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:42 < span class = "token number" > 17.76437< / span > < span class = "token boolean" > true< / span > < span class = "token boolean" > false< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 9< / span >
< span class = "token number" > 1005< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:43 < span class = "token number" > 0.4776< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
Affect< span class = "token punctuation" > (< / span > row-cnt:6< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 4< / span > ms.
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 我需要筛选出 < code > primeFactors< / code > 方法的调用信息< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ tt -s < span class = "token string" > ' method.name==" primeFactors" ' < / span >
INDEX TIMESTAMP COST< span class = "token punctuation" > (< / span > ms< span class = "token punctuation" > )< / span > IS-RET IS-EXP OBJECT CLASS METHOD
-------------------------------------------------------------------------------------------------------------------------------------
< span class = "token number" > 1000< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:38 < span class = "token number" > 1.096236< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1001< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:39 < span class = "token number" > 0.191848< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1002< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:40 < span class = "token number" > 0.069523< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1003< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:41 < span class = "token number" > 0.186073< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 1004< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:42 < span class = "token number" > 17.76437< / span > < span class = "token boolean" > true< / span > < span class = "token boolean" > false< / span > 0x4b67cf4d MathGame primeFactors
< span class = "token number" > 9< / span >
< span class = "token number" > 1005< / span > < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:43 < span class = "token number" > 0.4776< / span > < span class = "token boolean" > false< / span > < span class = "token boolean" > true< / span > 0x4b67cf4d MathGame primeFactors
Affect< span class = "token punctuation" > (< / span > row-cnt:6< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 607< / span > ms.
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 你需要一个 < code > -s< / code > 参数。< span style = "color:red;" > 同样的，搜索表达式的核心对象依旧是 < code > Advice< / code > 对象。< / span > < / p > < h4 id = "查看调用信息" tabindex = "-1" > < a class = "header-anchor" href = "#查看调用信息" aria-hidden = "true" > #< / a > 查看调用信息< / h4 > < p > 对于具体一个时间片的信息而言，你可以通过 < code > -i< / code > 参数后边跟着对应的 < code > INDEX< / code > 编号查看到他的详细信息。< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ tt -i < span class = "token number" > 1003< / span >
INDEX < span class = "token number" > 1003< / span >
GMT-CREATE < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :15:41
COST< span class = "token punctuation" > (< / span > ms< span class = "token punctuation" > )< / span > < span class = "token number" > 0.186073< / span >
OBJECT 0x4b67cf4d
CLASS demo.MathGame
METHOD primeFactors
IS-RETURN < span class = "token boolean" > false< / span >
IS-EXCEPTION < span class = "token boolean" > true< / span >
PARAMETERS< span class = "token punctuation" > [< / span > < span class = "token number" > 0< / span > < span class = "token punctuation" > ]< / span > @Integer< span class = "token punctuation" > [< / span > -564322413< span class = "token punctuation" > ]< / span >
THROW-EXCEPTION java.lang.IllegalArgumentException: number is: -564322413, need < span class = "token operator" > > =< / span > < span class = "token number" > 2< / span >
at demo.MathGame.primeFactors< span class = "token punctuation" > (< / span > MathGame.java:46< span class = "token punctuation" > )< / span >
at demo.MathGame.run< span class = "token punctuation" > (< / span > MathGame.java:24< span class = "token punctuation" > )< / span >
at demo.MathGame.main< span class = "token punctuation" > (< / span > MathGame.java:16< span class = "token punctuation" > )< / span >
Affect< span class = "token punctuation" > (< / span > row-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 11< / span > ms.
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < h4 id = "重做一次调用" tabindex = "-1" > < a class = "header-anchor" href = "#重做一次调用" aria-hidden = "true" > #< / a > 重做一次调用< / h4 > < p > 当你稍稍做了一些调整之后，你可能需要前端系统重新触发一次你的调用，此时得求爷爷告奶奶的需要前端配合联调的同学再次发起一次调用。而有些场景下，这个调用不是这么好触发的。< / p > < p > < code > tt< / code > 命令由于保存了当时调用的所有现场信息，所以我们可以自己主动对一个 < code > INDEX< / code > 编号的时间片自主发起一次调用，从而解放你的沟通成本。此时你需要 < code > -p< / code > 参数。通过 < code > --replay-times< / code > 指定 调用次数，通过 < code > --replay-interval< / code > 指定多次调用间隔(单位 ms, 默认 1000ms)< / p > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > $ tt -i < span class = "token number" > 1004< / span > -p
RE-INDEX < span class = "token number" > 1004< / span >
GMT-REPLAY < span class = "token number" > 2018< / span > -12-04 < span class = "token number" > 11< / span > :26:00
OBJECT 0x4b67cf4d
CLASS demo.MathGame
METHOD primeFactors
PARAMETERS< span class = "token punctuation" > [< / span > < span class = "token number" > 0< / span > < span class = "token punctuation" > ]< / span > @Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 946738738< / span > < span class = "token punctuation" > ]< / span >
IS-RETURN < span class = "token boolean" > true< / span >
IS-EXCEPTION < span class = "token boolean" > false< / span >
COST< span class = "token punctuation" > (< / span > ms< span class = "token punctuation" > )< / span > < span class = "token number" > 0.186073< / span >
RETURN-OBJ @ArrayList< span class = "token punctuation" > [< / span >
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 2< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 11< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 17< / span > < span class = "token punctuation" > ]< / span > ,
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 2531387< / span > < span class = "token punctuation" > ]< / span > ,
< span class = "token punctuation" > ]< / span >
Time fragment< span class = "token punctuation" > [< / span > < span class = "token number" > 1004< / span > < span class = "token punctuation" > ]< / span > successfully replayed.
Affect< span class = "token punctuation" > (< / span > row-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 14< / span > ms.
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 你会发现结果虽然一样，但调用的路径发生了变化，由原来的程序发起变成了 Arthas 自己的内部线程发起的调用了。< / p > < h4 id = "观察表达式" tabindex = "-1" > < a class = "header-anchor" href = "#观察表达式" aria-hidden = "true" > #< / a > 观察表达式< / h4 > < p > < code > -w, --watch-express< / code > 观察时空隧道使用< code > ognl< / code > 表达式< / p > < ul > < li > 使用< a href = "/doc/advice-class.html" class = "" > 表达式核心变量< / a > 中所有变量作为已知条件编写表达式。< / li > < / ul > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > < span class = "token punctuation" > [< / span > arthas@10718< span class = "token punctuation" > ]< / span > $ tt -t demo.MathGame run -n < span class = "token number" > 5< / span >
Press Q or Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class count: < span class = "token number" > 1< / span > , method count: < span class = "token number" > 1< / span > < span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 56< / span > ms, listenerId: < span class = "token number" > 1< / span >
INDEX TIMESTAMP COST< span class = "token punctuation" > (< / span > ms< span class = "token punctuation" > )< / span > IS-RET IS-EXP OBJECT CLASS METHOD
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
< span class = "token number" > 1000< / span > < span class = "token number" > 2021< / span > -01-08 < span class = "token number" > 21< / span > :54:17 < span class = "token number" > 0.901091< / span > < span class = "token boolean" > true< / span > < span class = "token boolean" > false< / span > 0x7699a589 MathGame run
< span class = "token punctuation" > [< / span > arthas@10718< span class = "token punctuation" > ]< / span > $ tt -w < span class = "token string" > ' target.illegalArgumentCount' < / span > -x < span class = "token number" > 1< / span > -i < span class = "token number" > 1000< / span >
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 60< / span > < span class = "token punctuation" > ]< / span >
Affect< span class = "token punctuation" > (< / span > row-cnt:1< span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 7< / span > ms.
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < ul > < li > 获取类的静态字段、调用类的静态方法< / li > < / ul > < div class = "language-bash ext-sh line-numbers-mode" > < pre class = "language-bash" > < code > < span class = "token punctuation" > [< / span > arthas@10718< span class = "token punctuation" > ]< / span > $ tt -t demo.MathGame run -n < span class = "token number" > 5< / span >
Press Q or Ctrl+C to abort.
Affect< span class = "token punctuation" > (< / span > class count: < span class = "token number" > 1< / span > , method count: < span class = "token number" > 1< / span > < span class = "token punctuation" > )< / span > cost < span class = "token keyword" > in< / span > < span class = "token number" > 56< / span > ms, listenerId: < span class = "token number" > 1< / span >
INDEX TIMESTAMP COST< span class = "token punctuation" > (< / span > ms< span class = "token punctuation" > )< / span > IS-RET IS-EXP OBJECT CLASS METHOD
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
< span class = "token number" > 1000< / span > < span class = "token number" > 2021< / span > -01-08 < span class = "token number" > 21< / span > :54:17 < span class = "token number" > 0.901091< / span > < span class = "token boolean" > true< / span > < span class = "token boolean" > false< / span > 0x7699a589 MathGame run
< span class = "token punctuation" > [< / span > arthas@10718< span class = "token punctuation" > ]< / span > $ tt -w < span class = "token string" > ' @demo.MathGame@random.nextInt(100)' < / span > -x < span class = "token number" > 1< / span > -i < span class = "token number" > 1000< / span >
@Integer< span class = "token punctuation" > [< / span > < span class = "token number" > 46< / span > < span class = "token punctuation" > ]< / span >
< / code > < / pre > < div class = "line-numbers" aria-hidden = "true" > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < div class = "line-number" > < / div > < / div > < / div > < p > 注意这里使用 < code > com.taobao.arthas.core.advisor.Advice#getLoader< / code > 加载,使用精确< code > classloader< / code > < a href = "/doc/ognl.html" class = "" > ognl< / a > 更好。< / p > < p > 高级用法 < a href = "https://github.com/alibaba/arthas/issues/482" target = "_blank" rel = "noopener noreferrer" > 获取 spring context 调用 bean 方法< span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > < / a > < / p > < ul > < li > < p > 需要强调的点< / p > < ol > < li > < p > < strong > ThreadLocal 信息丢失< / strong > < / p > < p > 很多框架偷偷的将一些环境变量信息塞到了发起调用线程的 ThreadLocal 中，由于调用线程发生了变化，这些 ThreadLocal 线程信息无法通过 Arthas 保存，所以这些信息将会丢失。< / p > < p > 一些常见的 CASE 比如：鹰眼的 TraceId 等。< / p > < / li > < li > < p > < strong > 引用的对象< / strong > < / p > < p > 需要强调的是，< code > tt< / code > 命令是将当前环境的对象引用保存起来，但仅仅也只能保存一个引用而已。如果方法内部对入参进行了变更，或者返回的对象经过了后续的处理，那么在 < code > tt< / code > 查看的时候将无法看到当时最准确的值。这也是为什么 < code > watch< / code > 命令存在的意义。< / p > < / li > < / ol > < / li > < / ul > < / div > <!-- [ --> <!-- ] --> < / div > < footer class = "page-meta" data-v-e0e60120 > < div class = "meta-item edit-link" > < a class = "external-link meta-item-label" href = "https://github.com/alibaba/arthas/edit/master/site/docs/doc/tt.md" rel = "noopener noreferrer" target = "_blank" aria-label = "在 GitHub 上编辑此页" > <!-- [ --> <!-- ] --> < span > 在 GitHub 上编辑此页< / span > < span > < svg class = "external-link-icon" xmlns = "http://www.w3.org/2000/svg" aria-hidden = "true" focusable = "false" x = "0px" y = "0px" viewbox = "0 0 100 100" width = "15" height = "15" > < path fill = "currentColor" d = "M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z" > < / path > < polygon fill = "currentColor" points = "45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9" > < / polygon > < / svg > < span class = "external-link-icon-sr-only" > 在新窗口打开< / span > < / span > <!-- [ --> <!-- ] --> < / a > < / div > < div class = "meta-item last-updated" > < span class = "meta-item-label" > Last Updated: < / span > <!-- --> < / div > < div class = "meta-item contributors" > < span class = "meta-item-label" > 贡献者: < / span > < span class = "meta-item-info" > <!-- [ --> <!-- [ --> < span class = "contributor" title = "email: hengyunabc@gmail.com" > hengyunabc< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: superheizai@aliyun.com" > superheizai< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: hollowman186@vip.qq.com" > Hollow Man< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: xiangmz0928@gmail.com" > Xiangmingzhe< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: snipercy@users.noreply.github.com" > vic< / span > <!-- [ --> , <!-- ] --> <!-- ] --> <!-- [ --> < span class = "contributor" title = "email: 983433479@qq.com" > 汪吉< / span > <!-- --> <!-- ] --> <!-- ] --> < / span > < / div > < / footer > <!-- --> <!-- [ --> <!-- ] --> < / main > <!-- ] --> < / div > <!-- --> <!-- ] --> < / div >
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