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[英]java.rmi.UnmarshalException: java.lang.ClassNotFoundException. Can't get acces to class from another physical JVM using RMI
[英]load: class MyApplet not found : java.lang.ClassNotFoundException. Why am i getting this,when the class file is there in the package?
當我嘗試運行小程序時,出現以下異常:
load: class MyApplet not found.
java.lang.ClassNotFoundException: MyApplet
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source)
at sun.net.www.http.HttpClient.parseHTTP(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.HttpURLConnection.getResponseCode(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 9 more
Exception: java.lang.ClassNotFoundException: MyApplet
小程序代碼:
import javax.swing.*;
import java.awt.*;
public class MyApplet extends JApplet {
public JFrame frame;
public JPanel panel;
public JButton button;
public void init() {
frame = new JFrame();
panel = new JPanel();
button = new JButton("click me ");
panel.setBackground(Color.RED);
panel.add(button);
frame.add(panel);
frame.setSize(300,300);
frame.setVisible(true);
}
}
html代碼:
<applet code="MyApplet" codebase="AppletPackage" archive="JAR.jar" height="800" width="800">
JAR.jar文件包含一個程序包Appletpackage,此程序包包含一個名為MyApplet.class
的類文件。
為什么會出現此異常? 我弄錯了嗎?
相對於codebase
參數,解析了archive
參數。 因此,在您的情況下,插件將查找文件AppletPackage/JAR.jar
包含的MyApplet.class
文件。
您應該將其更改為以下內容:
<applet code="AppletPackage.MyApplet" archive="JAR.jar" height="800" width="800">
這將解析為JAR.jar
中與HTML文件位於同一目錄中的JAR.jar
AppletPackage/MyApplet.class
。
這是嘗試解決在對第一個答案的評論中報告的錯誤消息:
java.lang.NoClassDefFoundError: AppletPackage/MyApplet (wrong name: MyApplet)
從源頭上看,我看到此“錯誤名稱”錯誤消息表明文件名和類名不匹配。 您聲稱您的類在AppletPackage
,並且文件名AppletPackage/MyApplet.class
可以滿足要求。 但是您上面引用的源代碼中沒有一行
package AppletPackage;
您應該添加該行,以便類文件包含該類的完全限定名稱。 然后,您應該能夠加載它。
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