frankyin-factual commented on pull request #29069:
URL: https://github.com/apache/spark/pull/29069#issuecomment-656954852
that's the code for `StdInstantiatorStrategy`:
```
public <T> ObjectInstantiator<T> newInstantiatorOf(Class<T> type) {
if(PlatformDescription.isThisJVM(HOTSPOT) ||
PlatformDescription.isThisJVM(OPENJDK)) {
// Java 7 GAE was under a security manager so we use a degraded
system
if(PlatformDescription.isGoogleAppEngine() &&
PlatformDescription.SPECIFICATION_VERSION.equals("1.7")) {
if(Serializable.class.isAssignableFrom(type)) {
return new ObjectInputStreamInstantiator<T>(type);
}
return new AccessibleInstantiator<T>(type);
}
// The UnsafeFactoryInstantiator would also work. But according to
benchmarks, it is 2.5
// times slower. So I prefer to use this one
return new SunReflectionFactoryInstantiator<T>(type);
}
else if(PlatformDescription.isThisJVM(DALVIK)) {
if(PlatformDescription.isAndroidOpenJDK()) {
// Starting at Android N which is based on OpenJDK
return new UnsafeFactoryInstantiator<T>(type);
}
if(ANDROID_VERSION <= 10) {
// Android 2.3 Gingerbread and lower
return new Android10Instantiator<T>(type);
}
if(ANDROID_VERSION <= 17) {
// Android 3.0 Honeycomb to 4.2 Jelly Bean
return new Android17Instantiator<T>(type);
}
// Android 4.3 until Android N
return new Android18Instantiator<T>(type);
}
else if(PlatformDescription.isThisJVM(JROCKIT)) {
// JRockit is compliant with HotSpot
return new SunReflectionFactoryInstantiator<T>(type);
}
else if(PlatformDescription.isThisJVM(GNU)) {
return new GCJInstantiator<T>(type);
}
else if(PlatformDescription.isThisJVM(PERC)) {
return new PercInstantiator<T>(type);
}
// Fallback instantiator, should work with most modern JVM
return new UnsafeFactoryInstantiator<T>(type);
}
```
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