The following fields are assigned to according to JavaVMOption.optionString.

abort_hook_t Arguments::_abort_hook = NULL;
exit_hook_t Arguments::_exit_hook = NULL;
vfprintf_hook_t Arguments::_vfprintf_hook = NULL;

However, there's no code in the JDK repo that uses these options. Instead, they are intended for programs that embed the JVM using JNI_CreateJavaVM.

We should add comments in arguments.cpp to clarify this. Otherwise this would look like dead code and someone might be tempted to remove it.

P.S. official docs are here: https://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/invocation.html