YunfengGao commented on pull request #6917:
URL: https://github.com/apache/skywalking/pull/6917#issuecomment-835750133
> Because this initialization actually is in one and only one thread of the
premain.
`synchronized` here confused me that there is a multi-threaded scenario,
haha.
```Java
public static void initDefaultLoader() throws AgentPackageNotFoundException {
if (DEFAULT_LOADER == null) {
synchronized (AgentClassLoader.class) {
if (DEFAULT_LOADER == null) {
DEFAULT_LOADER = new
AgentClassLoader(PluginBootstrap.class.getClassLoader());
}
}
}
}
```
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