JNI_CreateJavaVM does not load the JVM

Question

I'm trying to load the JVM from my C++ code in order to invoke existing Java API. Here is the code that I'm using to do it.
#define JAVAHOME "C:\\jdk1.5.0_03" /* Java 1.5.0 install directory */
#define HOME_DIR "M:"
#define ADMINAPI_HOME HOME_DIR "\\obj\\w32ud\\apps\\shared\\3rdparty\\admin\\lib"
#define DEFAULT_CLASSES "."
#define JAVA_CLASSES JAVAHOME "\\jre\\lib\\rt.jar" /* Standard Java Classes jar */
#define ADMIN_CLASSES ADMINAPI_HOME "\\admin.jar"
#define JAVA_WRAPPER HOME_DIR "\\classes\\AdminWrapper.jar"
this->m_VMArgs.version = JNI_VERSION_1_4;
this->m_VMArgs.nOptions = 3;
this->m_JVMOptions[0].optionString = "-Djava.class.path=" DEFAULT_CLASSES ";" JAVA_CLASSES ";" ADMIN_CLASSES ";" JAVA_WRAPPER;
this->m_JVMOptions[1].optionString = "-Djava.compiler=NONE"; /* disable JIT */
this->m_JVMOptions[2].optionString = "-Djava.home=" JAVAHOME; /* Specify Java Home directory location */
this->m_VMArgs.options = m_JVMOptions;
this->m_VMArgs.ignoreUnrecognized = JNI_FALSE;
JNI_CreateJavaVM (&m_pJVM, (void **)&m_pEnv, &m_VMArgs);
However, upon execution of the above server code, both m_pJVM as well as m_pEnv are NULL. What is the reason? I had this code (with directory path changes) work on a local machine but when I port it to the server (where M: is a mapped drive). I'm curious to know how does JNI_CreateJavaVM discovers the JVM and loads it?
Help is appreciated.
Thanks,
Suhas.

Answer 1

You will never get that to run if you use hardcoded values.
As you are on win try to query the registry :
HKEY_LOCAL_MACHINE,"SOFTWARE\\JavaSoft\\Java Runtime Environment"
and query current version and installation path.
btw: I hope you did not really place your jars at the root (/) of you server... :)