上周我遇到了类似的问题。我是Java Web Start的新手，因此我创建了一个简单的程序，用sudo apt-get update，JFrame和两个JLabel启动JButton。当我尝试启动程序时，它会启动一个窗口，其中显示消息“无法启动应用程序”，它为我提供了两个选项“确定”和“详细信息”。
这是我点击“详细信息”时显示的内容：
JTextField这是JFrame代码：
java.lang.NumberFormatException: For input string: "\Users\JuanCarlos\Documents\NetBeansProjects\HolaMundo\dist"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:580)
at java.lang.Integer.parseInt(Integer.java:615)
at com.sun.deploy.security.DeployManifestChecker.verifyCodebaseEx(Unknown Source)
at com.sun.deploy.security.DeployManifestChecker.verifyCodebase(Unknown Source)
at com.sun.deploy.security.DeployManifestChecker.verify(Unknown Source)
at com.sun.deploy.security.DeployManifestChecker.verify(Unknown Source)
at com.sun.javaws.security.AppPolicy.grantUnrestrictedAccess(Unknown Source)
at com.sun.javaws.security.JNLPSignedResourcesHelper.checkSignedResourcesHelper(Unknown Source)
at com.sun.javaws.security.JNLPSignedResourcesHelper.checkSignedResources(Unknown Source)
at com.sun.javaws.Launcher.prepareResources(Unknown Source)
at com.sun.javaws.Launcher.prepareAllResources(Unknown Source)
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.launch(Unknown Source)
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main.access$000(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
这是我正在使用的另一个类：
package holamundo;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class HelloWorld extends javax.swing.JFrame {
/**
* Creates new form HelloWorld
*/
public HelloWorld() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
holaLabel = new javax.swing.JLabel();
nombreTextField = new javax.swing.JTextField();
okButton = new javax.swing.JButton();
resultadoTextField = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
holaLabel.setText("HOLA");
nombreTextField.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
nombreTextFieldActionPerformed(evt);
}
});
okButton.setText("OK");
okButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
okButtonActionPerformed(evt);
}
});
resultadoTextField.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
resultadoTextFieldActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(150, 150, 150)
.addComponent(okButton))
.addGroup(layout.createSequentialGroup()
.addGap(81, 81, 81)
.addComponent(holaLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(resultadoTextField, javax.swing.GroupLayout.DEFAULT_SIZE, 97, Short.MAX_VALUE)
.addComponent(nombreTextField))))
.addContainerGap(183, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(81, 81, 81)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(holaLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(nombreTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(28, 28, 28)
.addComponent(okButton)
.addGap(18, 18, 18)
.addComponent(resultadoTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(107, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void nombreTextFieldActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void okButtonActionPerformed(java.awt.event.ActionEvent evt) {
String aux;
aux = this.nombreTextField.getText();
//System.out.println(co.cat("Pelos", aux));
this.resultadoTextField.setText(co.cat("Hola ",aux));
}
private void resultadoTextFieldActionPerformed(java.awt.event.ActionEvent evt) {
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(HelloWorld.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(HelloWorld.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(HelloWorld.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(HelloWorld.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new HelloWorld().setVisible(true);
}
});
}
// Variables declaration - do not modify
public javax.swing.JLabel holaLabel;
public javax.swing.JTextField nombreTextField;
public javax.swing.JButton okButton;
public javax.swing.JTextField resultadoTextField;
// End of variables declaration
public static Concatenar co=new Concatenar();
}
这是jnlp文件：
package holamundo;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class Concatenar {
String cat(String a, String b) {
return a + b;
}
}