Trying to run a simple program on series60

[L_Tambiah]

I am using the J2ME Wirless Toolkit(WT) and using JEdit as my Source Editor. I have copied an example of a Hello Program and saved it as HelloWorldMIDlet.java.

On J2ME WT

* created a New project called HelloSer60 and gave the class name HelloWorldMIDlet.

Compiled the program and got rid of syntax errors using J2ME.

After Compiling all errors J2ME reports the following:

Emulator: Missing JAR file.
Emulator command: D:\WTK20\wtklib\devices\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2_1\bin\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2_1\epoc32\release\wins\udeb\kmidp_debug.exe -parent_port 2810 -classpath D:Series_60_MIDP_SDK_for_Symbian_OS_v_1_2_1\lib\Series_60_MIDP_SDK_for_Symbian_OS_v_1_2_1\j2me-debug.zip -descripter c:\tmp\midp\HelloSer60.jad HelloSer60

java.lang.NullPointerException
at com.symbian.midp.compatibility.runtime.MIDletExecutor.runMIDlet(+131)
at com.symbian.midp.compatibility.runtime.MIDletMain.runFirstMIDlet(+77)
at com.symbian.midp.compatibility.runtime.MIDletMain.run(+346)
at com.sun.midp.midlet.Main.main(+56)


*First of all i need the JAR file, how do i create the JAR file?

*And then there is the java.lang.NullPointerException

How can i get round this, any help id be most grateful for any input.

L. Tambiah
United Kingdom

[grahamhughes]

First, you need to run the preverify utility on your classes. Then you can use the jar utility to make the jar file. The jar file contains a manifest, which is a text file describing the contents. Finally, you need the jad, which I'm guessing you already have. The jad file also contains a description of the application, some of which duplicates information in the manifest. The whole lot is described in the WTK documentation.

Sorry - I know that's a bit brief!! I've written a batch file that automates the basic process for building a simple MIDlet from one source code file, which should give you a reasonable example of the process. You can find it in the post http://discussion.forum.nokia.com/fo...1163#post61163

I suspect that the null pointer results from not having a jar (and therefore no midlet). Worry about it only if it still happens when you do have a jar!

Cheers,
Graham.