Posted by Tashinga Pemhiwa on Tuesday, September 29, 2009
Under: Java
Background
So I decided to learn Java ME development. And I came across a blog called - well what do you know - the Java ME Blog, over at http://www.javameblog.com/. Using the info on this blog along with what I found on the awesome java.net (http://today.java.net/pub/a/today/2005/02/09/j2me1.html), I was able to write a small MIDlet, and build it. Ah, now to run it... Not so fast; I kept getting an error message along these lines:
Starting emulator in execution mode java.io.IOException: java.io.IOException: No such file or directory at java.lang.PosixProcess.<init>(libgcj.so.81) at java.lang.Runtime.execInternal(libgcj.so.81) at java.lang.Runtime.exec(libgcj.so.81) at java.lang.Runtime.exec(libgcj.so.81) at com.sun.kvem.environment.JVM.run(Unknown Source) at com.sun.kvem.environment.EmulatorInvoker.runEmulatorOtherVM(Unknown Source) at com.sun.kvem.environment.EmulatorInvoker.runEmulator(Unknown Source) at com.sun.kvem.environment.ProfileEnvironment$KVMThread.runEmulator(Unknown Source) at com.sun.kvem.environment.ProfileEnvironment$KVMThread.run(Unknown Source) Caused by: java.io.IOException: No such file or directory at java.lang.PosixProcess.nativeSpawn(libgcj.so.81) at java.lang.PosixProcess.spawn(libgcj.so.81) at java.lang.PosixProcess$ProcessManager.run(libgcj.so.81)
After about 2 hrs of head-scratching and forum-and-mailing-list-hopping, I found two methods to solve the problem. They are explained below:
Method 1 - the hard way
Configuring default JDK on your Kubuntu Hardy box
To make Kubuntu recognize your jdk (JVM), use the update-alternatives command and issue following 3 commands one after another: sudo update-alternatives --install /usr/bin/java java <JDK_INSTALL_PATH_HERE>/bin/java 100 sudo update-alternatives --install /usr/bin/jar jar <JDK_INSTALL_PATH_HERE>/bin/jar 100 sudo update-alternatives --install /usr/bin/javac javac <JDK_INSTALL_PATH_HERE>/bin/javac 100
These 3 commands set your java, jar and javac commands. You can use same to set other java executables if you want.
Now running sudo update-alternatives --config java will give you a choice between the JDKs available on your machine and you can (if it doesn't already have a * next to it) set the Sun JDK as your default. Running java -version should give you an output similar to this:
java version "1.6.0_05" Java(TM) SE Runtime Environment (build 1.6.0_05-b13) Java HotSpot(TM) Client VM (build 10.0-b19, mixed mode, sharing)
HOORAY!! You're good to go. Running your application will now go smoothly.
Method 2 - The easy way
This method is cool because you don't have to change your system settings. 1. Open the file <NETBEANS_INSTALL_DIRECTORY>/mobility<WTK_VERSION>/bin/emulator in your favourite text editor ( ala nano, kate, vi, etc) 2. About the 3rd line you will find a line similar to javapathtowtk= Change that line to javapathtowtk=<JDK_INSTALL_PATH>/bin/
And you're done! Did you expect more? Sorry. Nothing to see here... Move right along and run your app. Now you will see a cool emulator phone on your screen.
Well that's all for now folks. More tips coming soon.
The simple answer is Tashinga N. Pemhiwa. Hailing from Zimbabwe, Africa, I grew up in Bulawayo in the Matebeleland region of Zim. I am first born in a family of six children, with two brothers and three sisters. My favourite activity is singing and professionally I enjoy web & software development. I am constantly researching new technologies and better ways to solve problems using the power of computing. I hold a BSc (Hons) degree in Computer Science from Midlands State University. I am a husband of one woman and a father of two. I hope to share anything that I consider useful on this blog and I look forward to your comments.
The simple answer is Tashinga N. Pemhiwa. Hailing from Zimbabwe, Africa, I grew up in Bulawayo in the Matebeleland region of Zim. I am first born in a family of six children, with two brothers and three sisters. My favourite activity is singing and professionally I enjoy web & software development. I am constantly researching new technologies and better ways to solve problems using the power of computing. I hold a BSc (Hons) degree in Computer Science from Midlands State University. I am a husband of one woman and a father of two. I hope to share anything that I consider useful on this blog and I look forward to your comments.
