ThreadStartEvent (Java SE 26 & JDK 26)
Description: declaration: module: jdk.jdi, package: com.sun.jdi.event, interface: ThreadStartEvent
Keywords: com.sun.jdi.event.ThreadStartEvent interface

# Interface ThreadStartEvent

All Superinterfaces:
  `Event, Mirror`

public interface ThreadStartEvent extends Event
Notification of a new running thread in the target VM. The new thread can be the result of a call to ``Thread.start()`` or the result of attaching a new thread to the VM though JNI. The notification is generated by the new thread some time before its execution starts. Because of this timing, it is possible to receive other events for the thread before this event is received. (Notably, `MethodEntryEvent`s and `MethodExitEvent`s might occur during thread initialization.) It is also possible for `VirtualMachine.allThreads()` to return a new started thread before this event is received.

Note that this event gives no information about the creation of the thread object which may have happened much earlier, depending on the VM being debugged.

Since:
  1.3
See Also:
  - `EventQueue`
  - `VirtualMachine`
  - `ThreadReference`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `ThreadReference`
  `thread()`
  Returns the thread which has started.

  ### Methods declared in interface Event

  `request`
  Modifier and Type
  Method
  Description
  `EventRequest`
  `request()`

  ### Methods declared in interface Mirror

  `toString, virtualMachine`
  Modifier and Type
  Method
  Description
  `String`
  `toString()`
  Returns a String describing this mirror
  `VirtualMachine`
  `virtualMachine()`
  Gets the VirtualMachine to which this Mirror belongs.

- ## Method Details

  - ### thread

    ThreadReference thread()
    Returns the thread which has started.
    Returns:
      a `ThreadReference` which mirrors the event's thread in the target VM.