User defined classpath setting using "-Djava.class.path="

Hello,
I am invoking a JVM from a C++ application ( say A ) which inturn will be started by another C++ application ( say B ).
The class path for the JVM is set by "-Djava.class.path=" option in application 'A' which will actually supplied by parent application 'B'.
I want to know how to do it ?
I tried with the following things but it doesn't work.
// the application 'A' gets classpath string from appication 'B' the "classpath" variable ( which is a string ) gets from application 'B'
// this is in application 'A'
// "classpath" variable in application 'A' holds the class path string optained from application 'B'
"-Djava.class.path=" classpath ; ---(1)
// "-Djava.class.path=" %classpath% ; ---(2)
// "-Djava.class.path=classpath" ; ---(3)
All the above tries are failed in first 2 tries the application even doesn't get compiled and in third try the appilcation doesn't set the classpath even though it is get compiled.
Do any one have any Idea !!

Hi,
I am not quite sure if I got your problem correctly...
Your application A has a variable called classpath containing the classpath recieved from B. right? Now you want to call the JVM with that.
I think what you got to do is something like
sprintf(myclasspath, "-Djava.class.path=%s", classpath);
this will build the correct string for the JVM in myclasspath. And that one can be used to call the JVM.
Does this sound right??

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hi bschauwe,
thanks for the suggestions! i was hoping you would reply. You have helped some others with classpath questions. :)
since its a dll, can you pass it values?
we do have an ini file that is already created but the file parser is in java so i would have to write another one in c. id like to stay away from that though. cause if it gets messed up or goes missing, clients wont be able to reach the java program, and in turn the database.
the classpath environment variable sounds like a good idea...will check into that. eventually we plan to wrap our software up in installshield so that would really be nice. clients could be ignorant of environment variables and still be able to run everything.
my solution for now has been to find my jar file by recursively searching the c drive. and use GetFilePath() to get the full path and pass that to JNI_CreateJavaVM. i did get it to work...just wondering if this is a good idea.
i was thinking that if the dll is in the same folder as the jar file i could just use dot notation but that just doesnt seem like a good idea to make that assumption. but i think java does something similar 'cause Sun says not to move the java.dll file.
thanks for your input,
txjump

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C:\Documents and Settings\samimi\IdeaProjects\SampleWebService\src\ws\build.xml:
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Thank u very much Jay SenSharma this was helpful
and thank u sandeep_singh this is the answer,
I find another answer too :
adding my class files to the path remove the error:
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Mensaje editado por:
user517323

Thank you for your answer.
I'd like to know something more about how far does that limited support go, in case it could be of some use.
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