java - 小程序隐藏类未发现异常

Question

我正在开发一个行为奇怪的小程序：这不是通常的“我无法在浏览器中启动我的小程序”问题，而是更微妙的问题。

该小程序由一个带有 8 个选项卡的 jtabbedpane 组成，每个选项卡都在工作流中进行一些数据操作，用户有两个按钮（后退和前进）来循环浏览选项卡。

当我在浏览器中运行它（最新的 chrome 或 firefox，但这没关系）时，我注意到从第 7 个选项卡到第 8 个选项卡时会出现持续的减速：在后者中，我在该选项卡中放置了一个带有自定义 tablemodel 的 jtable 和在eclipse中它运行得很好。几个调试步骤后，我注意到 jvm 为 RateTableModel 类抛出了一个 classnotfoundexception，这是我的自定义表模型。奇怪的是，即使我在 IDE 和作为自签名小程序到浏览器中测试小程序，也不会在任何控制台中引发异常。我到处验证：没有空的 catch 块，每个异常总是打印它的 stackstrace，如果我将我的 tablemodel 的初始化代码放在 try/catch 块中，那么异常永远不会被捕获。

我想问的是关于为什么会发生这种情况的任何想法。

类 RateTableModel 位于包 geotel.utils 中，在我必须加载这个之前，我经常实例化其他类，并且我验证了这个类存在于 jar 中。

有关开发的详细信息（可能对阅读此内容的人有用）：

使用命令对小程序进行签名

jarsigner -keystore keystore3 C:\GestioneOneri.jar me3

小程序从以下 html 文件运行：

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
            <title>Titolo</title>
    </head>
    <body>
        <script src="http://www.java.com/js/deployJava.js"></script>
        <script> 
            var attributes = {code:'geotel.gui.Login.class', 
                    archive:'GestioneOneri.jar,mysql-connector-java-5.1.20-bin.jar,poi-3.9-20121203.jar,forms-1.3.0.jar', 
                    width:1024, height:700} ;
            var parameters = {jnlp_href:'gestioneoneri.jnlp', portalUrl:'http://192.168.146.145:8080/GestioneOneriServlet', nomeUtente:'', numeroPratica:'', percorsoFileCalcoloOneri:"/", nomeFileCalcoloOneri:"calcoloOneri.xls"} ; 
            var version = '1.6' ;
            deployJava.runApplet(attributes, parameters, version);  
        </script>
        <noscript>This page requires JavaScript.</noscript>
    </body>
</html>

JNLP 文件如下：

<?xml version="1.0" encoding="UTF-8"?>
    <jnlp href="gestioneoneri.jnlp">
        <information>
            <title>Gestione Oneri Urbanistici</title>
            <vendor>Geotel soc. coop.</vendor>
            <offline-allowed />
        </information>
        <resources>
            <j2se version ="1.6+" initial-heap-size="128m" max-heap-size="1024m"
  href="http://java.sun.com/products/autodl/j2se" />
            <jar href="GestioneOneri.jar" main="true" />
        <jar href="mysql-connector-java-5.1.20-bin.jar"/>
        <jar href="poi-3.9-20121203.jar"/>
        <jar href="forms-1.3.0.jar"/>
        </resources>
        <applet-desc
            name="Gestione Oneri Urbanistici"
            main-class="geotel.gui.Login"
            width="1024"
            height="700"/>
    </jnlp>

导致 ClassNotFoundException 的代码如下：class DatiRatePanel

this.tm = new geotel.utils.RateTableModel(columnNames, oneriPratica, rate, rateizzazioniPreviste);

RateTableModel 类的定义是

public class RateTableModel extends AbstractTableModel

编辑：经过几个调试步骤，我发现在调试视图中有截图中的情况

我完全不知道这些键代表什么，但是如果我一直按 F5（Step into），这些键就会消失，接下来的步骤将继续执行，并且类加载器神奇地能够找到 RateTableModel 类。我怎样才能摆脱这个？

谢谢！

EDIT2：我对 Eclipse 文档中的键图标进行了一些研究，发现它们是锁定对象的监视器。据我所知，监视器出现在有同步代码块的地方，而我在这里没有（而且我确信这些块没有被调用）。这让我很生气...

EDIT3：我尝试放置一些关于每条指令需要多少时间的 printlns，以下是源代码和输出。我不明白为什么时间在打印 2 和 4 中“重置”（或者看起来如此），似乎有更多线程看不到时间变量已初始化（但这是不可能的！）。

Long time = System.currentTimeMillis();
this.tm = new RateTableModel(columnNames, oneriPratica, rate, rateizzazioniPreviste);
time = System.currentTimeMillis() - time;
System.out.println("DatiRatePanel2.populatePanel() 1 time: " + time);
rateTable = new MyTable(tm, columnModel, this);
time = System.currentTimeMillis() - time;
System.out.println("DatiRatePanel2.populatePanel() 2 time: " + time);
table = new ExcelAdapter(rateTable);
time = System.currentTimeMillis() - time;
System.out.println("DatiRatePanel2.populatePanel() 3 time: " + time);
scrollPane = new JScrollPane(rateTable);
time = System.currentTimeMillis() - time;
System.out.println("DatiRatePanel2.populatePanel() 4 time: " + time);
scrollPane.getVerticalScrollBar().setUnitIncrement(10);
this.add(scrollPane, "1, 3, fill, fill");
aggiornaTotali();
this.invalidate();
this.validate();
this.repaint();
time = System.currentTimeMillis() - time;
System.out.println("DatiRatePanel2.populatePanel() 5 time: " + time);

输出：

DatiRatePanel2.populatePanel() 1 time: 2
DatiRatePanel2.populatePanel() 2 time: 1364288266968
DatiRatePanel2.populatePanel() 3 time: 2
DatiRatePanel2.populatePanel() 4 time: 1364288266969
DatiRatePanel2.populatePanel() 5 time: 3

EDIT4：在 java 插件控制台中激活了 5 级，这就是我得到的：

DettagliPratichePanel.updateObjects() impostazione oneri
network: Connessione a http://192.168.146.145:8080/GestioneOneriServlet/findWhereNomeConfigurazioneEqualsConfRateizzazioni con proxy=DIRECT
network: Connessione a http://192.168.146.145:8080/GestioneOneriServlet/findWhereNomeConfigurazioneEqualsConfRateizzazioni con proxy=DIRECT
network: Connessione a http://192.168.146.145:8080/GestioneOneriServlet/findWhereNomeConfigurazioneEqualsConfRateizzazioni con proxy=DIRECT
network: Connessione a http://192.168.146.145:8080/GestioneOneriServlet/findWhereNomeConfigurazioneEqualsConfRateizzazioni con proxy=DIRECT
network: Connessione a http://192.168.146.145:8080/GestioneOneriServlet/findByConfRateizzazioniConfRata con proxy=DIRECT
network: Connessione a http://192.168.146.145:8080/GestioneOneriServlet/findByConfRateizzazioniConfRata con proxy=DIRECT
network: Connessione a http://192.168.146.145:8080/GestioneOneriServlet/findByConfRateizzazioniConfRata con proxy=DIRECT
network: Connessione a http://192.168.146.145:8080/GestioneOneriServlet/findByConfRateizzazioniConfRata con proxy=DIRECT
DettagliPratichePanel.updateObjects() polizza
basic: JNLP2ClassLoader.findClass: geotel.utils.RateTableModel: try again ..
DatiRatePanel2.populatePanel() 1 time: 2
DatiRatePanel2.populatePanel() 3 time: 1364309403101
DatiRatePanel2.populatePanel() 4 time: 3
DatiRatePanel2.populatePanel() 5 time: 1364309403102
basic: JNLP2ClassLoader.findClass: geotel.utils.MyTable$ButtonsCellRenderer: try again ..
------------------------------------------------------------------------ Here starts trouble
network: Connessione a http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar con proxy=DIRECT
network: Connessione a http://192.168.146.129:8091/ con proxy=DIRECT
network: Connessione http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar con cookie "__ac="Qt/t/I4Nt7/qj0H5vhUrqR+ZrJYgcHJvZ2V0dGlzdGEx"; _ZopeId="97847822A52RRctuIzM""
network: CleanupThread used 1 us
network: Scaricamento risorsa: http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar
    Content-Length: 1.940.942
    Content-Encoding: null
network: URL http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar scritto su file C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-15459ea4-temp
security: File lista librerie sicure non trovato
cache: Create from verifier: JarSigningData{hasOnlySignedEntries=true, hasSingleCodeSource=true, hasMissingSignedEntries=false}
network: CleanupThread used 2 us
cache: Replacing MemoryCache entry (cnt=2) for http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jarwas=com.sun.deploy.cache.CacheEntry (29348568) now=com.sun.deploy.cache.CacheEntry (24374818)
network: Connessione a http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar con proxy=DIRECT
network: Connessione a http://192.168.146.129:8091/ con proxy=DIRECT
network: Connessione http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar con cookie "__ac="Qt/t/I4Nt7/qj0H5vhUrqR+ZrJYgcHJvZ2V0dGlzdGEx"; _ZopeId="97847822A52RRctuIzM""
network: CleanupThread used 1 us
network: Scaricamento risorsa: http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar
    Content-Length: 1.940.942
    Content-Encoding: null
network: URL http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar scritto su file C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-27c7ae17-temp
security: File lista librerie sicure non trovato
cache: Create from verifier: JarSigningData{hasOnlySignedEntries=true, hasSingleCodeSource=true, hasMissingSignedEntries=false}
network: CleanupThread used 1 us
cache: Replacing MemoryCache entry (cnt=3) for http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jarwas=com.sun.deploy.cache.CacheEntry (24374818) now=com.sun.deploy.cache.CacheEntry (8045053)

-------------------------------------This block is repeated at least 30 times before this
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\23\5d616017-2432b323
cache: MemoryCache: removed entry http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-515e0fde
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-515e0fde
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-642e11c6
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-642e11c6
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-36c18954
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-36c18954
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-3dd37d44
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-3dd37d44
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-74a8c32b
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-74a8c32b
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-2278e899
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-2278e899
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-36a95dca
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-36a95dca
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-15459ea4
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-15459ea4
cache: Create from verifier: JarSigningData{hasOnlySignedEntries=true, hasSingleCodeSource=true, hasMissingSignedEntries=false}
network: CleanupThread used 2 us
cache: Adding MemoryCache entry: http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar
network: Connessione a http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar con proxy=DIRECT
network: Connessione a http://192.168.146.129:8091/ con proxy=DIRECT
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\23\5d616017-1cffa7d0
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\14\39df63ce-72747a9e
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\15\7e499c8f-55d9e14b
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\23\5d616017-1ff05f86
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\14\39df63ce-3623cf5c
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\15\7e499c8f-767f4e5c
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-78a94a0b
network: Connessione http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar con cookie "__ac="Qt/t/I4Nt7/qj0H5vhUrqR+ZrJYgcHJvZ2V0dGlzdGEx"; _ZopeId="97847822A52RRctuIzM""
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-16cf3e35
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\14\39df63ce-3d8f935b
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\15\7e499c8f-2b757fb1
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\23\5d616017-65139493
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\14\39df63ce-1d5deb21
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\15\7e499c8f-3a4f46c6
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-48a86fb3
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-4b1ec669
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\23\5d616017-1c1ed2e1
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\14\39df63ce-35f43fda
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\15\7e499c8f-14bf2ddf
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-10a0c30f
network: CleanupThread used 1 us
network: Scaricamento risorsa: http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar
    Content-Length: 1.940.942
    Content-Encoding: null
network: URL http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar scritto su file C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-203bfb91-temp
security: File lista librerie sicure non trovato
cache: Create from verifier: JarSigningData{hasOnlySignedEntries=true, hasSingleCodeSource=true, hasMissingSignedEntries=false}
network: CleanupThread used 1 us
cache: Replacing MemoryCache entry (cnt=3) for http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jarwas=com.sun.deploy.cache.CacheEntry (20330403) now=com.sun.deploy.cache.CacheEntry (8313353)
cache: MemoryCache: removed entry http://192.168.146.129:8091/Scia/sportello-unico-edilizia/archivio-pratiche-edilizie/permesso_di_costruire.2012-10-25.0455740504/portal_url/++resource++java/GestioneOneri.jar
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-25fd39ec
cache: Closing CachedJarFile C:\Users\Andrea\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\51\58374d33-25fd39ec

我在这里可以理解的是，在该类加载器搜索内部类 ButtonsCellRenderer 之后，它开始了这种泛洪（最终阻止了网页中的所有内容，包括 Java 控制台）。这个问题是由它是一个内部类引起的吗？

正如 Joop Eggen 所问，我正在发布我的 JTable 的代码。包geotel.utils；

import geotel.configuration.Configuration;
import geotel.gui.DatiPersonaliPanel;
import geotel.gui.DatiRatePanel2;
import geotel.gui.GestionePratichePanel;
import geotel.gui.IManager;
import geotel.gui.ImportazionePanel;

import java.awt.Color;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.net.URL;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumnModel;
import javax.swing.table.TableModel;

public class MyTable extends JTable
{
class ButtonsCellRenderer extends JPanel implements TableCellRenderer
{
    private static final long serialVersionUID = -4945689480058875463L;

    public Component getTableCellRendererComponent(final JTable table, Object value, boolean isSelected, boolean hasFocus, final int row, int column)
    {
        this.setLayout(new GridLayout(1, 1));
        if(gestione instanceof ImportazionePanel)
        {
            if(column == 0)
            {
                URL editUrl = getClass().getResource("/resource/images/051.gif");
                Image editImage = Toolkit.getDefaultToolkit().getImage(editUrl);
                JButton edit = new JButton(new ImageIcon(editImage));
                edit.setBorderPainted(false);
                edit.setContentAreaFilled(false);
                edit.setFocusPainted(false);
                edit.setOpaque(false);
                this.add(edit);
            }
            else
            {
                new Exception("else non gestito").printStackTrace();
            }
        }
        else
        {
            if(column == 0)
            {
                URL editUrl = getClass().getResource("/resource/images/005.gif");
                Image editImage = Toolkit.getDefaultToolkit().getImage(editUrl);
                JButton editB = new JButton(new ImageIcon(editImage));
                editB.setBorderPainted(false);
                editB.setContentAreaFilled(false);
                editB.setFocusPainted(false);
                editB.setOpaque(false);
                if(gestione instanceof GestionePratichePanel)
                {
                    if(Configuration.getRuoloUtenteConnesso().getModificaPratica())
                    {
                        if(edit)
                            editB.setEnabled(true);
                        else
                            editB.setEnabled(false);
                    }
                    else
                        editB.setEnabled(false);
                }
                else if(gestione instanceof DatiRatePanel2)
                {
                    if(getValueAt(row, 5) != null && !getValueAt(row, 5).equals(""))
                        editB.setEnabled(false);
                    else if(Configuration.getRuoloUtenteConnesso().getModificaPagamento())
                    {
                        if(edit)
                            editB.setEnabled(true);
                        else
                            editB.setEnabled(false);
                    }
                    else
                        editB.setEnabled(false);
                }
                else if(gestione instanceof DatiPersonaliPanel)
                {
                    if(edit)
                        editB.setEnabled(true);
                    else
                        editB.setEnabled(false);
                }
                this.add(editB);
            }
            else
            {
                URL removeUrl = getClass().getResource("/resource/images/003.gif");
                Image removeImage = Toolkit.getDefaultToolkit().getImage(removeUrl);
                JButton remove = new JButton(new ImageIcon(removeImage));
                remove.setBorderPainted(false);
                remove.setContentAreaFilled(false);
                remove.setFocusPainted(false);
                remove.setOpaque(false);
                if(gestione instanceof GestionePratichePanel)
                {
                    if(Configuration.getRuoloUtenteConnesso().getEliminaPratica())
                    {
                        if(edit)
                            remove.setEnabled(true);
                        else
                            remove.setEnabled(false);
                    }
                    else
                        remove.setEnabled(false);
                }
                else if(gestione instanceof DatiRatePanel2)
                {
                    if(getValueAt(row, 5) != null && !getValueAt(row, 5).equals(""))
                        remove.setEnabled(false);
                    else if(Configuration.getRuoloUtenteConnesso().getEliminaPagamento())
                    {
                        if(edit)
                            remove.setEnabled(true);
                        else
                            remove.setEnabled(false);
                    }
                    else
                        remove.setEnabled(false);
                }
                else if(gestione instanceof DatiPersonaliPanel)
                {
                    if(edit)
                        remove.setEnabled(true);
                    else
                        remove.setEnabled(false);
                }
                this.add(remove);
            }
        }
        return this;
    }
}

class MyTableButtonMouseListener implements MouseListener
{
    private JTable ptable;

    public MyTableButtonMouseListener(JTable table)
    {
        ptable = table;
    }

    private void forwardEventToButton(MouseEvent e)
    {
        TableColumnModel columnModel = ptable.getColumnModel();
        int column = columnModel.getColumnIndexAtX(e.getX());
        int row = e.getY() / ptable.getRowHeight();
        int value;

        if(gestione instanceof ImportazionePanel)
        {
            if(row < ptable.getRowCount() && row >= 0 && column >= 0 && column < 1)
            {
                ((ImportazionePanel) gestione).importSelected((String) ptable.getValueAt(row, 1));
                ptable.repaint();
            }
        }
        else
        {
            if(row < ptable.getRowCount() && row >= 0 && column >= 0 && column < 2)
            {
                try
                {
                    value = (Integer) ptable.getValueAt(row, 2);
                    switch(column)
                    {
                        case 0:
                        {
                            gestione.editAction(value);
                            break;
                        }
                        case 1:
                        {
                            gestione.deleteAction(value);
                            break;
                        }
                        default:
                            break;
                    }
                    ptable.repaint();
                }
                catch(Exception e1)
                {
                    e1.printStackTrace();
                }
            }
        }
    }

    public void mouseClicked(MouseEvent e)
    {
        forwardEventToButton(e);
    }

    public void mouseEntered(MouseEvent e)
    {
    }

    public void mouseExited(MouseEvent e)
    {
    }

    public void mousePressed(MouseEvent e)
    {
    }

    public void mouseReleased(MouseEvent e)
    {
    }
}

private static final long serialVersionUID = 3591458853529380099L;

protected IManager gestione;
protected TableModel tm;
protected boolean edit;

public MyTable()
{
    super();
    this.setBackground(new Color(244, 244, 244));
    this.setShowHorizontalLines(true);
    this.setShowVerticalLines(true);
    this.getTableHeader().setReorderingAllowed(false);
    this.setRowSelectionAllowed(true);
    this.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
    this.setFillsViewportHeight(true);
    this.addMouseListener(new MyTableButtonMouseListener(this));
}

public MyTable(TableModel tm, TableColumnModel columns, IManager gestione, boolean edit)
{
    super(tm, columns);
    this.tm = tm;
    this.gestione = gestione;
    this.edit = edit;
    // this.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    this.setBackground(new Color(244, 244, 244));
    this.setShowHorizontalLines(true);
    this.setShowVerticalLines(true);
    this.getTableHeader().setReorderingAllowed(false);
    this.setRowSelectionAllowed(true);
    this.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
    this.setFillsViewportHeight(true);
    this.addMouseListener(new MyTableButtonMouseListener(this));
}

public TableCellRenderer getCellRenderer(int row, int column)
{
    if(this.gestione instanceof ImportazionePanel)
    {
        if(column < 1)
        {
            return new ButtonsCellRenderer();
        }
        else
            return super.getCellRenderer(row, column);
    }
    else
    {
        if(column < 2)
        {
            return new ButtonsCellRenderer();
        }
        else
        {
            return super.getCellRenderer(row, column);
        }
    }
}

public RataTableRow getRowObjectByIndex(int row)
{
    if(gestione instanceof DatiRatePanel2)
    {
        return ((RateTableModel) tm).getRowObjectByIndex(row);
    }
    return null;
}

public Object[] getRowObjectById(Integer id)
{
    Object[] ret = null;
    for(int i = 0; i < tm.getRowCount(); i++)
    {
        if(tm.getValueAt(i, 2).equals(id))
        {
            ret = new Object[tm.getColumnCount()];
            for(int j = 0; j < tm.getColumnCount(); j++)
                ret[j] = tm.getValueAt(i, j);
            break;
        }
    }
    return ret;
}

public Component prepareRenderer(TableCellRenderer renderer, int Index_row, int Index_col)
{
    Component comp = super.prepareRenderer(renderer, Index_row, Index_col);
    // even index, selected or not selected
    if(Index_row % 2 == 0)
    {
        if(!isCellSelected(Index_row, Index_col))
            comp.setBackground(new Color(240, 240, 240));
        else
        {
            comp.setForeground(Color.black);
            comp.setBackground(Color.green);
        }
    }
    else
    {
        if(!isCellSelected(Index_row, Index_col))
            comp.setBackground(Color.white);
        else
        {
            comp.setForeground(Color.black);
            comp.setBackground(Color.green);
        }
    }
    return comp;
}
}

score 4 · Accepted Answer

根据一些经验，我的猜测是，未找到类的问题源于附带问题、调试环境、类加载信息、首次加载等。

使用表模型可能会产生严重的惩罚，例如在 TreeModel 中，TreeNode 错误地递归地实例化其所有子 TreeNode。

我会首先寻找类似的行为，也许是分析你的表模型类。当然，如果可能的话，我会切换一些选项卡，看看前一个选项卡中是否有清理代码。

就我所见，您在小程序中使用了 JDBC。这是昂贵的，所以一定要记录所有的 SQL 调用。

不是一个具体的答案，但我很好奇我是否部分正确（就像任何江湖骗子一样）。

扩展问题代码后

问题在于渲染器中的工作太多。请执行下列操作。它可以写得更紧凑。

仍然值得怀疑的是，旧JButton.isEnabled()的保留在原始代码和此代码中。

private JButton editB = new JButton();
private final Icon ICON_051;
private final Icon ICON_005;
private final Icon ICON_003;

public ButtonsCellRenderer()
{
    {
        URL editUrl = getClass().getResource("/resource/images/051.gif");
        Image editImage = Toolkit.getDefaultToolkit().getImage(editUrl);
        ICON_051 = new ImageIcon(editImage);
    }
    {
        URL editUrl = getClass().getResource("/resource/images/005.gif");
        Image editImage = Toolkit.getDefaultToolkit().getImage(editUrl);
        ICON_005 = new ImageIcon(editImage);
    }
    {
        URL editUrl = getClass().getResource("/resource/images/003.gif");
        Image editImage = Toolkit.getDefaultToolkit().getImage(editUrl);
        ICON_003 = new ImageIcon(editImage);
    }
    this.setLayout(new GridLayout(1, 1));
    editB.setBorderPainted(false);
    editB.setContentAreaFilled(false);
    editB.setFocusPainted(false);
    editB.setOpaque(false);
    this.add(editB);
}

public Component getTableCellRendererComponent(final JTable table, Object value, boolean isSelected, boolean hasFocus, final int row, int column)
{
    if(gestione instanceof ImportazionePanel)
    {
        if(column == 0)
        {
            editB.setIcon(ICON_051);
        }
        else
        {
            new Exception("else non gestito").printStackTrace();
        }
    }
    else
    {
        boolean enabled = editB.isEnabled();
        if(column == 0)
        {
            editB.setIcon(ICON_005);
            if(gestione instanceof GestionePratichePanel)
            {
                enabled = Configuration.getRuoloUtenteConnesso().getModificaPratica() && edit;
            }
            else if(gestione instanceof DatiRatePanel2)
            {
                if(getValueAt(row, 5) != null && !getValueAt(row, 5).equals(""))
                    enabled = false;
                else
                    enabled = Configuration.getRuoloUtenteConnesso().getModificaPagamento() && edit;
               else
                    enabled = false;
            }
            else if(gestione instanceof DatiPersonaliPanel)
            {
                enabled = edit;
            }
        }
        else
        {
            editB.setIcon(ICON_003);
            if(gestione instanceof GestionePratichePanel)
            {
                enabled = Configuration.getRuoloUtenteConnesso().getEliminaPratica() && edit;
            }
            else if(gestione instanceof DatiRatePanel2)
            {
                if(getValueAt(row, 5) != null && !getValueAt(row, 5).equals(""))
                    enabled = false;
                else
                    enabled = Configuration.getRuoloUtenteConnesso().getEliminaPagamento() && edit;
            }
            else if(gestione instanceof DatiPersonaliPanel)
            {
                eenabled = true;
            }
        }
        editB.setEnabled(enabled);
    }
    return this;
}

score 1 · Accepted Answer

在网上徘徊我发现这个线程：jar下载了多次因为在我的小程序问题中有一个与此类似的问题我按照其中一个回复中的说明进行操作（特别是关闭控制面板/java/常规选项卡/临时互联网文件/保留我电脑上的临时 Internet 文件），猜猜是什么……多次下载的问题已经消失，至少在浏览器中导致 UI 冻结的异常似乎也消失了。我将在 Eclipse 调试器中尝试现在正在发生的事情。任何人都可以解释用户在最后两篇文章中的意思吗？关于tomcat设置缓存过滤器。我该如何检查？我应该使用 Wireshark 寻找什么？谢谢

java - 小程序隐藏类未发现异常

2 回答 2

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