2025-03-14 21:59:59 -06:00
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# arthas-watch
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> Method invoke data observation.
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> See also: `arthas`, `arthas-trace`.
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> More information: <https://arthas.aliyun.com/en/doc/watch.html>.
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- Observe the first parameter and return value of method, and expand the nested attributes of the object to 4 levels:
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2025-12-16 10:20:31 -07:00
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`watch {{class-pattern}} {{method-pattern}} '{{{ params[0],returnObj }}}' -x 4`
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2025-03-14 21:59:59 -06:00
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- When the value of the first parameter of the method is 5, the second parameter and return value are output, and the object is expanded 4 layers:
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2025-12-16 10:20:31 -07:00
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`watch {{class-pattern}} {{method-pattern}} '{{{ params[1],returnObj }}}' '{{"5".equals(params[0])}}' -x 4`
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2025-03-14 21:59:59 -06:00
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- When the method returns or an exception occurs, observe the count property of the second parameter:
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2025-12-16 10:20:31 -07:00
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`watch {{class-pattern}} {{method-pattern}} '{{{ params[1].count }}}' -e -s`
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