Could not find or load main class I2CExemple. Can someone help me?

DouglasAlexandre

I'm trying to run a Java ME Embedded application in raspberry pi, using I2C protocols. But when I try to run the command: java -jar I2CExemple, I get an error: Could not find or load main class I2CExemple. Already researched some ways around this error, but I was not successful. Can someone help me?

Sergey.N-Oracle

Hi!

You are unlikely running JavaME Embedded since its binary doesn't contain "java" executable.  Do you mean JavaSE Embedded? If so please ask question in corresponding conference.

/Sergey

DouglasAlexandre

OK, but I'm trying to run an example from Oracle's website: Working with the I2C Bus

and it says Java ME Embedded 8.1. What am I doing wrong?

Sergey.N-Oracle

Have you installed JavaME8.1 runtime?  Please note that JavaME requires application to be installed prior to run. Please check how to page

DouglasAlexandre

ok, really had no attack for this detail. I'll try! Thaky

Thank you

DouglasAlexandre

Corrects errors for the Java ME Embedded runtime. But I could not even install, the other error!

[email protected] ~/bin $ ./installMidlet.sh /home/pi/NetBeansProjects/I2CExemple/dist/I2CExemple.jar

Java is starting. Press Ctrl-C to exit

Error installing the suite: Reason = 13

Invalid JAD Exception, reason: 13 (MISSING_SUITE_NAME), message: Reason = 13, extra data: MIDlet-Name

- com/sun/midp/installer/Installer.checkJarAttributes(), bci=53

- com/sun/midp/installer/Installer.installStep7(), bci=720

- com/sun/midp/installer/Installer.performInstall(), bci=147

- com/sun/midp/installer/Installer.install(), bci=60

- com/sun/midp/scriptutil/CommandLineInstaller.run(), bci=139

- java/lang/Thread.run(), bci=5

Sergey.N-Oracle

Looks like you are unfamiliar with JavaME application and provisioning model. To reduce a number of potential mistakes you can use Netbeans and JavaME-E SDK to create correct application and run sanity check with emulator. And only then connect your RPi board to SDK and install verified application. See SDK how to

DouglasAlexandre

Hi, Sergey!

Sorry for all this work. But I'm using netbeans, use the sdk normally. Already managed to run some examples Java ME Embedded via netbeans, including k64F board too. But this example to use i2c in Raspi is complicated ... lol When I try to run it in sdk happens this:

TRACE: <at java.lang.NullPointerException>,

java.lang.NullPointerException

- com/sun/midp/installer/InstallerCommandHandler.handleGetVersionCommand(), bci=36

- com/oracle/midp/proxy/ProxyEventListener.handleDeveloperAgentEvent(), bci=814

- com/oracle/midp/proxy/ProxyEventListener.packetReceived(), bci=10

- com/oracle/midp/proxy/JavaChannelDispatcher.process(), bci=142

- com/sun/midp/events/EventQueue.run(), bci=129

- java/lang/Thread.run(), bci=5

I do not understand what's wrong. : /

Sergey.N-Oracle

Hmm, this error indicates problem in SDK GUI-to-runtime channel. Does it happens when you run application with emulator or real device?

DouglasAlexandre

This error was generated when running in the emulator. Something corrupted? can be?

DouglasAlexandre

When I run the same application, which uses i2c in k64f he performs. But nothing happens with the display of 7 segments.

Should run the same code on two boards(raspi and k64f) if the display has connected to the correct pins?