Java 如何在 IntelliJ 中调试多线程应用程序？
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How to debug a multi-threaded app in IntelliJ?
提问by m0skit0
I'm having a strange issue with multiple threads and breakpoints in IntelliJ IDEA 14.0.2. Code after the breakpoint is executed before it stops on it.
我在 IntelliJ IDEA 14.0.2 中遇到了多线程和断点的奇怪问题。断点之后的代码在它停止之前执行。
import java.util.concurrent.atomic.AtomicInteger;
public class Main {
private static final int NUM_CLIENTS = 1000;
static class TestRunnable implements Runnable {
AtomicInteger lock;
@Override
public void run() {
synchronized (this.lock) {
int curCounter = this.lock.addAndGet(1);
System.out.println("Thread: " + Thread.currentThread().getName() + "; Count: " + curCounter);
if (curCounter >= NUM_CLIENTS) {
lock.notifyAll();
}
}
}
}
public static void main(final String args[]) {
final AtomicInteger lock = new AtomicInteger(0);
for (int i = 0; i < NUM_CLIENTS; i++) {
TestRunnable tr1 = new TestRunnable();
tr1.lock = lock;
new Thread(tr1).start();
}
synchronized (lock) {
try {
lock.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("Main woken up");
}
}
}
When I put a breakpoint (Suspend All) at line 12, synchronized (this.lock), System.out.printlnstill executes (sometimes several times). Here's a screenshot:
当我在第 12 行放置断点 (Suspend All) 时synchronized (this.lock)，System.out.println仍然会执行（有时会执行几次）。这是一个屏幕截图：
As far as I know, all threads should stop at the breakpoint.
据我所知，所有线程都应该在断点处停止。
采纳答案by Makoto
The documentation reads confusingly, but this is the relevant block.What it distills down to is setting the property to suspend on threads, and not the entire application instead. This will cause you to hit the break point on each individual thread instead of an arbitrary, indeterminate thread.
该文档读起来令人困惑，但这是相关的块。它的精髓是将属性设置为在线程上挂起，而不是整个应用程序。这将导致您在每个单独的线程而不是任意的、不确定的线程上遇到断点。
- Suspend Policy: All
- When a breakpoint is hit, all threads are suspended.
- Suspend Policy: Thread
- When the breakpoint is hit, the thread where the breakpoint is hit is suspended.
- 暂停政策：全部
- 当遇到断点时，所有线程都将挂起。
- 暂停策略：线程
- 当断点被击中时，被击中断点的线程被挂起。
