I have recently been working with a mobile client where the possibility to retrieve the raw byte array from an image was important. I struggled to find any working solutions on forums all over but none was working as I wanted. Why don’t the Image.java have an option to retrieve the raw byte array?

The numorus options on forums included getting the RGB-data as an int array and then bit-switching to get the proper output. BUT, if you want to create an Image based on your newly created byte array, if fails with an IllegalArgumentException.

Here is what I did for this workaround. I’m not sure if this is the correct way to do it but in my case it did what I wanted:

/**
   * Get the resource from jar-package as input stream to get the byte[] raw format
   * @param resource The local file name
   * @return The image byte array
   */
public byte[] getResourceAsByteArray(String resource){
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	InputStream bais;
	try {
		bais = (InputStream)getClass().getResourceAsStream("//" + resource);
		int c;
		while((c = bais.read()) != -1){
			baos.write(c);
		}
		bais.close();
		baos.close();
	} catch (IOException e) {
		e.printStackTrace();
	}
	return baos.toByteArray();
}

I recently installed Windows 7 64-bit om my Dell work laptop and had a lot of issues concerning the starting of the Java ME 3.0 Service. When I started it I got ConnectException: Connection refused.

I found out that I had installed the wrong version of the JDK. I installed the 64-bit version which aparently is not working well with the Java ME SDK 3.0. I was also not logged in/had an administrator account and therefore could not turn the UAC off. This is also an issue because you have’nt got the authority to run the localhost service.

Here is the installation how-to:

• Download and install the current version of JDK SE but select the 32-bit version
  Java SE Downloads
• Download and install the current version of Java ME SDK(for now 3.0)
  Java ME Downloads
• Log in as administrator
• Start -> Getting started (hover over arrow) -> Change UAC settings
• Drag the slider to the bottom and press OK

My currently thought is that the Java ME SDK 3.0 requires the 32-bit JDK version and will stop on “Starting modules” and give this Error in a pop up:

java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:525)
at java.net.Socket.connect(Socket.java:475)
at java.net.Socket.<init>(Socket.java:372)
at java.net.Socket.<init>(Socket.java:186)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:595)
Caused: java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
java.net.ConnectException: Connection refused: connect
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:601)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:198)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:322)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:97)
Caused: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
java.net.ConnectException: Connection refused: connect]
at com.sun.jndi.rmi.registry.RegistryContext.lookup(RegistryContext.java:101)
at com.sun.jndi.toolkit.url.GenericURLContext.lookup(GenericURLContext.java:185)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at javax.management.remote.rmi.RMIConnector.findRMIServerJNDI(RMIConnector.java:1886)
at javax.management.remote.rmi.RMIConnector.findRMIServer(RMIConnector.java:1856)
at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:257)
Caused: java.io.IOException: Failed to retrieve RMIServer stub
at javax.management.remote.rmi.RMIConnector.connect(RMIConnector.java:338)
at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:248)
at com.sun.jme.toolkit.remoting.client.rmiimpl.ObjectServerConnectionImpl.connect(Unknown Source)
at com.sun.jme.toolkit.remoting.client.rmiimpl.ObjectServerConnectionImpl.start(Unknown Source)
Caused: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.jme.toolkit.bootstrap.Batch.invoke(Unknown Source)
at com.sun.jme.toolkit.bootstrap.Batch.tryInvoke(Unknown Source)
at com.sun.jme.toolkit.bootstrap.Batch.startObjects(Unknown Source)
at org.netbeans.modules.javame.common.container.Module.start(Module.java:21)
at org.netbeans.modules.javame.common.container.ContainerSupport.startModule(ContainerSupport.java:67)
at org.netbeans.modules.javame.common.container.devicemanager.DevicemanagerHelper.getDeviceManagerConnection(DevicemanagerHelper.java:41)
at org.netbeans.modules.javame.common.container.devicemanager.DevicemanagerHelper.ensureConnected(DevicemanagerHelper.java:48)
at org.netbeans.modules.javame.common.container.devicemanager.DevicemanagerHelper.getDeviceManager(DevicemanagerHelper.java:84)
at org.netbeans.modules.javame.platform.jme_sdk.autoinstaller.AutoInstaller.ensureDMStarted(AutoInstaller.java:292)
at org.netbeans.modules.javame.platform.jme_sdk.autoinstaller.AutoInstaller.restored(AutoInstaller.java:63)
at org.netbeans.core.startup.NbInstaller.loadCode(NbInstaller.java:421)
at org.netbeans.core.startup.NbInstaller.load(NbInstaller.java:342)
at org.netbeans.ModuleManager.enable(ModuleManager.java:906)
at org.netbeans.core.startup.ModuleList.installNew(ModuleList.java:428)
at org.netbeans.core.startup.ModuleList.trigger(ModuleList.java:364)
at org.netbeans.core.startup.ModuleSystem.restore(ModuleSystem.java:276)
at org.netbeans.core.startup.Main.getModuleSystem(Main.java:165)
at org.netbeans.core.startup.Main.start(Main.java:312)
at org.netbeans.core.startup.TopThreadGroup.run(TopThreadGroup.java:110)
[catch] at java.lang.Thread.run(Thread.java:619)