[英]Applet hidden classnotfound exception
我正在开发一个行为异常的applet:这不是通常的“我无法在浏览器中启动applet”问题,而是一些更微妙的问题。
该小程序包含一个带有8个选项卡的jtabbedpane,每个选项卡在工作流中进行一些数据操作,并且用户有两个按钮(后退和前进)来循环浏览这些选项卡。
当我将其运行到浏览器中(最新的chrome或firefox,但这无关紧要)时,从第7个标签页转到第8个标签页时,我注意到速度持续下降:在后者中,我在该标签页中放置了一个带有自定义表格模型的jtable,在日食中运行正常。 几个调试步骤之后,我注意到jvm为类RateTableModel抛出了classnotfoundexception,这是我的自定义表模型。 奇怪的是,即使我在IDE中以及作为浏览器中的自签名小程序都测试了该小程序,该异常也不会在任何控制台中引发。 我到处都进行了验证:没有空的catch块,每个异常都会始终打印其stackstrace,如果我将tablemodel的初始化代码放在try / catch块中,则永远不会捕获该异常。 更有趣的是,经过一段随机的时间后,执行继续,就好像什么都没发生一样(这次仅在IDE中),而在浏览器中,GUI的行为就像一个正常的例外:它将所有事情弄乱了。
我想问的是关于发生这种情况的任何想法。
RateTableModel类位于geotel.utils包中,在该类中,我必须定期实例化其他类,然后才能加载该类,并验证了该类是否存在于jar中。
有关开发的详细信息(也许对阅读此内容的人可能有用):
使用以下命令对小程序进行签名
jarsigner -keystore keystore3 C:\GestioneOneri.jar me3
小程序是从以下html文件运行的:
<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);
并且RateTableModel类的定义是
public class RateTableModel extends AbstractTableModel
编辑:经过更多调试步骤后,我发现在调试视图中屏幕截图中存在这种情况
我绝对不知道这些键代表什么,但是如果我一直按F5(进入)这些键就会消失,接下来的步骤将继续执行,并且类加载器将神奇地能够找到类RateTableModel。 我该如何摆脱呢?
谢谢!
EDIT2:我研究了Eclipse文档中的按键图标,发现它们是锁定对象上的监视器。 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(我确信这些块没有被调用)。 真让我生气...
EDIT3:我尝试将一些printlns放在每条指令所需的时间上,以下是源代码和输出。 我不明白为什么在打印2和4中时间会被“重置”(或看起来如此),似乎还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,它会开始泛洪(最终将阻止网页中的所有内容,包括Java控制台)。 这个问题可能是由于它是内部类引起的吗?
正如Joop Eggen所问,我正在发布JTable的代码。 软件包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;
}
}
根据我的经验,类未找到的问题源于附带问题,调试环境,类加载信息,首次加载等。
对于表模型,可能会产生沉重的代价,例如在TreeModel中,TreeNode错误地递归实例化其所有子TreeTree。
我首先会寻找类似的行为,也许是分析您的表模型类。 当然,如果可能的话,我会切换一些选项卡,以查看先前的选项卡中是否有清除代码。
对于我所看到的,您正在applet中使用JDBC。 这很昂贵,因此绝对要记录所有SQL调用。
这不是一个具体的答案,但我很好奇自己是否部分正确(就像任何偷偷摸摸的骗子一样)。
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。
仍然令人怀疑的是,旧的JButton.isEnabled()
是在原始代码和此代码中维护的。
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;
}
在网上徘徊,我发现了这个线程: jar下载了多次因为我的小程序问题中有一个与此类似的问题,所以我按照其中一项答复中的说明进行了操作(特别是关闭了控制面板/ java /常规选项卡/ Internet临时文件/保持我的计算机上的Internet临时文件),然后猜怎么着……多次下载的问题已经消失了,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调试器中尝试发生的事情。 任何人都可以在最近的两个帖子中解释用户的意思吗? 关于tomcat设置缓存过滤器。 我该如何检查? 我应该用Wireshark寻找什么? 谢谢
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