Why Can't I Catch an `ArrayIndexOutOfBoundsException` from a `Future` and `SwingWorker` when Using an `Executor`?-javaTutorial-php.cn

Why Can't I Catch an `ArrayIndexOutOfBoundsException` from a `Future` and `SwingWorker` when Using an `Executor`?

Patricia Arquette

Release： 2024-12-17 01:12:24

Original

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Why Can't I Catch an `ArrayIndexOutOfBoundsException` from a `Future` and `SwingWorker` when Using an `Executor`?

Unable to catch ArrayIndexOutOfBoundsException from Future and SwingWorker if thread starts Executor

Problem:
I am using Executor for SwingWorker incorrectly identifies the wrong elements from a Vector when multi-threaded, it looks like this code is rather ignoring elements that are not present in the Vector.

Problem details:

How did I accidentally ignore non-existent elements in a Vector?
How to catch such exception?

Problem output:

运行：
线程状态，名称：StartShedule，SwingWorker 状态为 STARTED
线程状态，名称：StartShedule，SwingWorker 状态为 DONE
线程状态，名称：StartShedule，SwingWorker 状态为 STARTED
线程状态，名称：StartShedule，SwingWorker 状态为 DONE
线程状态，名称：StartShedule，SwingWorker 状态为 STARTED
线程状态，名称：StartShedule，SwingWorker 状态为 DONE
构建成功（总时间：11 秒）

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Exception raised by uncommenting the following code:

// 更改 TableValues1()； // 取消注释以获取 ArrayIndexOutOfBoundsException

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Modified output:

运行：
线程“AWT-EventQueue-0”中出现异常java.lang.ArrayIndexOutOfBoundsException：数组索引超出范围：2
       在 java.util.Vector.get(Vector.java:694)
       在 KondorExport.Util.Help.Table.TableWithExecutor.changeTableValues1(TableWithExecutor.java:70)
       在 KondorExport.Util.Help.Table.TableWithExecutor.access0(TableWithExecutor.java:18)
       在 KondorExport.Util.Help.Table.TableWithExecutor.actionPerformed(TableWithExecutor.java:61)
       在 javax.swing.Timer.fireActionPerformed(Timer.java:271)
       在 javax.swing.Timer$DoPostEvent.run(Timer.java:201)
       在 java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
       在 java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
       在 java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
       在 java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
       在 java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
       在 java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
       在 java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
       在 java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
线程状态，名称：StartShedule，SwingWorker 状态为 STARTED
线程状态，名称：StartShedule，SwingWorker 状态为 DONE
构建成功（总时间：10 秒）

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Code snippet:

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.List;
import java.util.Vector;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import javax.swing.*;
import javax.swing.table.*;

public class TableWithExecutor extends JFrame {

    // ... 代码 ...

    private void changeTableValues1() {
        fwDeals1 = new Vector<String>();
        fwDeals1.add("First"); // ElementAt(0)
        fwDeals1.add("Second");// ElementAt(1)
        checkDealsInDb1(fwDeals1.get(1), fwDeals1.get(2));
    }

    // ... 代码 ...
}

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Edit:
by in I added the rethrowing of exceptions in the done() method in Future#get() (thanks to @takteek for the great suggestion).

@Override
    protected void done() {
        try {
            get();
            // errLabel.setText(String.valueOf(get()));
        } catch (InterruptedException ie) {
            ie.printStackTrace();
        } catch (ExecutionException ee) {
            ee.printStackTrace();
        } catch (IllegalStateException is) {
            is.printStackTrace();
        }
    }

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But the output is still only:

运行：
Got exception
线程状态，名称：StartShedule，SwingWorker 状态为 STARTED
线程状态，名称：StartShedule，SwingWorker 状态为 DONE
Got exception
线程状态，名称：StartShedule，SwingWorker 状态为 STARTED
线程状态，名称：StartShedule，SwingWorker 状态为 DONE
Got exception
线程状态，名称：StartShedule，SwingWorker 状态为 STARTED
线程状态，名称：StartShedule，SwingWorker 状态为 DONE
Got exception
线程状态，名称：StartShedule，SwingWorker 状态为 STARTED
线程状态，名称：StartShedule，SwingWorker 状态为 DONE
构建成功（总时间：13 秒）

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