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# mbean
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[`mbean` online tutorial](https://arthas.aliyun.com/doc/arthas-tutorials.html?language=en&id=command-mbean)
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::: tip
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show Mbean information
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:::
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This command can show or monitor Mbean attribute information.
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### Parameters
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| Name | Specification |
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| ------------------: | :---------------------------------------------------------------------------------------------------- |
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| _name-pattern_ | pattern for the Mbean name |
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| _attribute-pattern_ | pattern for the attribute name |
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| [m] | show meta information |
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| [i:] | specify the interval to refresh attribute value (ms) |
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| [n:] | execution times |
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| [E] | turn on regex matching while the default mode is wildcard matching. Only effect on the attribute name |
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### Usage
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show all Mbean names:
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```bash
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mbean
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```
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show meta data of Mbean:
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```bash
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mbean -m java.lang:type=Threading
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```
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show attributes of Mbean:
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```bash
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mbean java.lang:type=Threading
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```
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Mbean name support wildcard matcher:
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```bash
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mbean java.lang:type=Th*
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```
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::: warning
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Notes：ObjectName matching rules differ from normal wildcards, Reference resources：[javax.management.ObjectName](https://docs.oracle.com/javase/8/docs/api/javax/management/ObjectName.html?is-external=true)
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:::
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Wildcards match specific attributes:
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```bash
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mbean java.lang:type=Threading *Count
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```
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Switch to regular matching using the `-E` command:
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```bash
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mbean -E java.lang:type=Threading PeakThreadCount|ThreadCount|DaemonThreadCount
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```
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Real-time monitoring using `-i` command:
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```bash
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mbean -i 1000 java.lang:type=Threading *Count
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```
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