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38 lines
1.1 KiB
Markdown
38 lines
1.1 KiB
Markdown
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Use the `vmtool` command to find the jvm object.
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### Find string objects in jvm
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`vmtool --action getInstances --className java.lang.String`{{execute T2}}
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```bash
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$ vmtool --action getInstances --className java.lang.String
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@String[][
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@String[Sorry, deque too big],
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@String[head=%d tail=%d capacity=%d%n],
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@String[elements=%s%n],
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@String[sun/nio/ch/IOVecWrapper],
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@String[40252e37-8a73-4960-807e-3495addd5b08:1620922383791],
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@String[40252e37-8a73-4960-807e-3495addd5b08:1620922383791],
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@String[sun/nio/ch/AllocatedNativeObject],
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@String[sun/nio/ch/NativeObject],
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@String[sun/nio/ch/IOVecWrapper$Deallocator],
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@String[Java_sun_nio_ch_FileDispatcherImpl_writev0],
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]
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```
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### limit parameter
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> Through the `--limit` parameter, you can limit the number of return values to avoid pressure on the JVM when obtaining large data. The default value is 10.
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So the above command is actually equivalent to:
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```bash
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vmtool --action getInstances --className java.lang.String --limit 10
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```
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If you set `--limit` to a negative number, all objects are traversed.
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