O que é isso: java.lang.IllegalAccessError?

[lemis]

Ola pessoal, esse código funciona no computador de casa mas aqui na empresa não.

import javax.sound.midi.*;  

public class MusicTest1_01 {  

    public void play() {  
        try {  
            Sequencer sequencer = MidiSystem.getSequencer();  
            System.out.println("Successfully got a sequencer");  
            throw new MidiUnavailableException();  
        } catch(MidiUnavailableException ex) {  
            System.out.println("Bummer");  
        }  
    }  

    public static void main(String[] args) {  
        MusicTest1 mt = new MusicTest1();  
        mt.play();  
    }  
}

Mensagem do eclipse:

Exception in thread "main" java.lang.IllegalAccessError: class com.sun.media.sound.AbstractPlayer cannot access its superclass com.sun.media.sound.AbstractMidiDevice

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(Unknown Source)

at java.security.SecureClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.access$100(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(Unknown Source)

at java.security.SecureClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.access$100(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at com.sun.media.sound.MixerSequencerProvider.getDeviceInfo(MixerSequencerProvider.java:28

at javax.sound.midi.MidiSystem.getFirstDevice(Unknown Source)

at javax.sound.midi.MidiSystem.getFirstDevice(Unknown Source)

at javax.sound.midi.MidiSystem.getFirstDevice(Unknown Source)

at javax.sound.midi.MidiSystem.getDefaultDevice(Unknown Source)

at javax.sound.midi.MidiSystem.getDefaultDeviceWrapper(Unknown Source)

at javax.sound.midi.MidiSystem.getSequencer(Unknown Source)

at javax.sound.midi.MidiSystem.getSequencer(Unknown Source)

at cap11.MusicTest1.play(MusicTest1.java:7)

at cap11.MusicTest1_01.main(MusicTest1_01.java:18

Alguma ideia? do que pode ser isso.

Rodei no prompt de comando sem usar o eclipse, ai ele compila e na hora de executar dispara essa mensagem.

E a versão da JVM é igual nas duas máquinas.

1.7.0_05

[andbecker]

na linha 16

MusicTest1 mt = new MusicTest1();

está instanciando o nome errado da classe (faltou o _01)

[lemis]

na linha 16

MusicTest1 mt = new MusicTest1();

está instanciando o nome errado da classe (faltou o _01)

Ola andbecker, acho que não é isso.

VEJA esse.

import javax.sound.midi.*;
public class MusicTest1 {

	public void play() {
		try {
			Sequencer player = MidiSystem.getSequencer();
			System.out.println("Successfully got a sequencer");
		} catch(MidiUnavailableException ex) {
			System.out.println("Bummer");
		}
	}

	public static void main(String[] args) {
		MusicTest1 mt = new MusicTest1();
		mt.play();
	}
}

Funciona no Eclipse, mas quando salvo ele em um editor de texto e salvo como .java

Na hora de EXECUTAR dispara essa mensagem de erro.

C:\>javac MusicTest1.java

C:\>java MusicTest1

Exception in thread "main" java.lang.IllegalAccessError: class com.sun.media.sou

nd.AbstractPlayer cannot access its superclass com.sun.media.sound.AbstractMidiD

evice

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:792)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14

2)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)

at java.net.URLClassLoader.access$100(URLClassLoader.java:71)

at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:792)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14

2)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)

at java.net.URLClassLoader.access$100(URLClassLoader.java:71)

at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at com.sun.media.sound.MixerSequencerProvider.getDeviceInfo(MixerSequenc

erProvider.java:28)

at javax.sound.midi.MidiSystem.getFirstDevice(MidiSystem.java:1349)

at javax.sound.midi.MidiSystem.getFirstDevice(MidiSystem.java:1406)

at javax.sound.midi.MidiSystem.getFirstDevice(MidiSystem.java:1373)

at javax.sound.midi.MidiSystem.getDefaultDevice(MidiSystem.java:1160)

at javax.sound.midi.MidiSystem.getDefaultDeviceWrapper(MidiSystem.java:1

110)

at javax.sound.midi.MidiSystem.getSequencer(MidiSystem.java:439)

at javax.sound.midi.MidiSystem.getSequencer(MidiSystem.java:389)

at MusicTest1.play(MusicTest1.java:6)

at MusicTest1.main(MusicTest1.java:15)