[Tinyos-help] Re: java compile errors in tinyos-2.x

Wed, 21 Mar 2007 14:15:55 -0800 

I'm cc'ing this to the help list for you...

This looks like a runtime error, not compilation...but anyway...

I think you have
    CLASSPATH="$TOSROOT/support/sdk/java/tinyos.jar;."
so java should be able to find MessageListener in that tinyos.jar.

First make sure that the CP is really set in the shell environment
where you are running by doing "echo $CLASSPATH". Then make sure
the jar exists by doing "ls -l $TOSROOT/support/sdk/java/tinyos.jar",
and, assuming success, that the class is actually in the jar with:
"jar tvf $TOSROOT/support/sdk/java/tinyos.jar | grep MessageListener"

If all of that is successful I might try re-compiling all of the
java tools (there should be a top level makefile or something) and
changing the CP to point to the dir-tree that contains the new .classes.
I don't have a T2 devsys, but I'd guess something like:
    $TOSROOT/support/sdk/java
would contain net/tinyos/message/MessageListener.java and .class

MS


mark karpa wrote:

Hi,
I thank you for your kind help in advance. I try to fix some Java compilation errors in tinyos-2.x. I use the code from the following web site: http://sing.stanford.edu/abbado/RssiSampling.tar This code basically measures the noise and records the noise data to the sensor's memory. And the java file gets the data from the memory. I compiled the code and installed succesfully. The apllication module is working. But, java file not.It gives the following error when I try to read the data from the mote's memory: Exception in thread "main" java.lang.NoClassDefFoundError: net/tinyos/message/Me 
ssageListener
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12 
4)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
I have read so many emails in the email list. These Java compilation errors are common with Tinyos-2.x. Do you hava any suggestion to fix this Java problem? or Do you have any application module to measure noise level in tinyos-1.x using Telos or Tmotes? Thanks again for your kind help. 
Mark

*/Michael Schippling <[EMAIL PROTECTED]>/* wrote:

    A) please send questions to the help list so we can keep a record.
    B) What's the problem?
    MS


    mark karpa wrote:
     > Hi,
     >
     > I have seen your email about java compilation problem in tinyos-2.x
     >
     > I also came accross similar problems in tinyos-2.x. How did you
    fix the
     > problem?
     >
     > My tinyos.sh is as follows:
     >
     > # script for profile.d for bash shells, adjusted for each users
     > # installation by substituting /opt for the actual tinyos tree
     > # installation point.
     > TOSROOT="/opt/tinyos-2.x"
     > export TOSROOT
     > TOSDIR="$TOSROOT/tos"
     > export TOSDIR
     > CLASSPATH="$TOSROOT/support/sdk/java/tinyos.jar;."
     > export CLASSPATH
     > MAKERULES="$TOSROOT/support/make/Makerules"
     > export MAKERULES
     > PATH= "/opt/msp430/bin:$PATH"
     > export PATH
     >
     > #Extend path for java
     > type java >/dev/null 2>/dev/null || PATH=`/usr/local/bin/locate-jre
     > --java`:$PATH
     > type javac >/dev/null 2>/dev/null || PATH=`/usr/local/bin/locate-jre
     > --javac`:$PATH
     > echo $PATH | grep -q /usr/local/bin || PATH=/usr/local/bin:$PATH
     >
     >
     > Any help is greatly appreciated.
     >
     > Regards,
     > Mark
     >
     >
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