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beiwei30 2018-10-28 21:28:17 +08:00
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site/src/site/sphinx/en/classloader.md
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classloader classloader
=========== ===========
Check the inheritance tree, urls and classes loading profiles of the class loaders. View hierarchy, urls and classes-loading info for the class-loaders.
It can be a great help for `ResourceNotFoundException` when you can use command `classloader` to specify a class loader to `getResources` and print all the urls of the valid resources. `classloader` can search and print out the URLs for a specified resource from one particular classloader. It is quite handy when analyze `ResourceNotFoundException`.
### Options ### Options
|Name|Specification| |Name|Specification|
|---:|:---| |---:|:---|
|[l]|list all class loader instances based on thread count| |[l]|list all class loader instances|
|[t]|print the inheritance structure of the class loaders| |[t]|print classloader's hierarchy|
|[a]|list all the classes loaded by all the class loaders (use it with great caution since the output can be huge)| |[a]|list all the classes loaded by all the class loaders (use it with great caution since the output can be huge)|
|[c:]|get the hashcode of the class loader| |[c:]|print classloader's hashcode|
|[c: r:]|using class loader to search resource| |[c: r:]|using class loader to search resource|
### Usage ### Usage
* Categorised by class loader * View statistics categorized by class type
```bash ```bash
$ classloader $ classloader
@ -36,7 +36,7 @@ $ classloader
Affect(row-cnt:11) cost in 66 ms. Affect(row-cnt:11) cost in 66 ms.
``` ```
* Categorized by class loader instance * View statistics categorized by loaded classes number
```bash ```bash
$ classloader -l $ classloader -l
@ -86,7 +86,7 @@ $ classloader -l
sun.reflect.misc.MethodUtil@1201f221 1 1201f221 sun.misc.Launcher$AppClassLoader@14dad5dc sun.reflect.misc.MethodUtil@1201f221 1 1201f221 sun.misc.Launcher$AppClassLoader@14dad5dc
``` ```
* Check inheritance tree of the class loaders * View class-loaders hierarchy
```shell ```shell
$ classloader -t $ classloader -t
@ -100,7 +100,7 @@ $ classloader -t
| | +-sun.reflect.DelegatingClassLoader@73f44f24 | | +-sun.reflect.DelegatingClassLoader@73f44f24
``` ```
* Check URL of the class loader * Show the URLs from which to load classes and resources for one particular URLClassLoader
```shell ```shell
$ classloader -c 5ffe9775 $ classloader -c 5ffe9775
@ -113,7 +113,7 @@ file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/pandora.th
file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/picocontainer-2.14.3.jar file:/Users/hello/soft/taobao-tomcat-7.0.64/deploy/taobao-hsf.sar/lib/picocontainer-2.14.3.jar
``` ```
* Using class loader to search for resource * Use one class loader to search one particular resource
```shell ```shell
$ classloader -c 226b143b -r META-INF/MANIFEST.MF $ classloader -c 226b143b -r META-INF/MANIFEST.MF
@ -121,7 +121,7 @@ $ classloader -c 226b143b -r META-INF/MANIFEST.MF
jar:file:/Users/hello/.m2/repository/javax/annotation/jsr250-api/1.0/jsr250-api-1.0.jar!/META-INF/MANIFEST.MF jar:file:/Users/hello/.m2/repository/javax/annotation/jsr250-api/1.0/jsr250-api-1.0.jar!/META-INF/MANIFEST.MF
``` ```
* Using class loader to look for `*.class` file * Use one class loader to search one particular class
```shell ```shell
$ classloader -c 1b6d3586 -r java/lang/String.class $ classloader -c 1b6d3586 -r java/lang/String.class