arthas-watch
Verified for current stable LTS
Arthas Watch Command: Observe First Parameter And Return Value
An engineer would use the arthas-watch command to monitor and analyze the first parameter and return value of specific methods in a Java application during runtime, particularly when investigating performance issues or debugging expected behavior related to those methods. Exact CLI syntax to observe first parameter and return value using Arthas Watch.
When to use this: An engineer would use the arthas-watch command to monitor and analyze the first parameter and return value of specific methods in a Java application during runtime, particularly when investigating performance issues or debugging expected behavior related to those methods.
Command Syntax
watch <class-pattern> <method-pattern> '{< params[0],returnObj >}' -x 4watch <class-pattern> <method-pattern> "`{< params[0],returnObj >`}" -x 4Command Breakdown
-x- Command Option
- Tool-specific option used by this command invocation.
FAQ
Purpose: Exact syntax to observe first parameter and return value using Arthas Watch.
Test path: Replace placeholders and run destructive commands in a disposable workspace first.
Flag behavior: Tool version, platform, and shell can change behavior.
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Related Operations
Arthas Watch Command: Observe Parameters And Return Value When First Is Five
watch <class-pattern> <method-pattern> '{< params[1],returnObj >}' '<"5".equals(params[0])>' -x 4 Arthas Watch Command: Observe Count Property On Return Or Exception watch <class-pattern> <method-pattern> '{< params[1].count >}' -e -s Arthas Watch Command: Observe First Parameter Return Value watch <class-pattern> <method-pattern> '{< params[0],returnObj >}' -x 4 Arthas Watch Command: Conditional Parameter Observation watch <class-pattern> <method-pattern> '{< params[1],returnObj >}' '<"5".equals(params[0])>' -x 4 Arthas Watch Command: Observe Second Parameter Count watch <class-pattern> <method-pattern> '{< params[1].count >}' -e -s