FindClass returns null

我在返回null的FindClass呼叫中遇到问题：

JData::JIgZorroBridgeClass = env->FindClass(JData::IgZorroBridgePath);

我发现的大多数答案是关于缺少软件包名称或类加载程序问题的大多数答案。

igzorrobridge Path这是我的班级，带有完全合格的软件包名称，即。com/igz/zorro。另外，您可以看到，在此FindClass调用之前，我正在初始化JVM，所以我想我应该已经在正确的线程上了。

我还有什么可以检查的吗？

#include <assert.h>
#include "JNIHandler.hpp"
#include "JReferences.hpp"
const char* JVMClassPathOption =  "-Djava.class.path=Plugin/ig/igplugin-0.1.jar";
const char* IgZorroBridgePath = "com/danlind/igz/ZorroBridge";

void JNIHandler::init()
{
    initializeJVM();
    initializeJavaReferences();
}
void JNIHandler::initializeJVM()
{
    if(isJVMLoaded) return;
    JavaVMInitArgs args;
    JavaVMOption options[1];
    args.version = JData::JNI_VERSION;
    args.nOptions = 1;
    args.options = options;
    options[0].optionString = (char*)JData::JVMClassPathOption;
    args.ignoreUnrecognized = JNI_FALSE;
    jint res = JNI_CreateJavaVM(&jvm, (void **)&env, &args);
    assert(res ==  JNI_OK);
    isJVMLoaded = true;
}
JNIEnv* JNIHandler::getJNIEnvironment(){
    return env;
}
JNIEnv* JNIHandler::getEnvForCurrentThread()
{
    int envStat = jvm->GetEnv((void **)&env, JData::JNI_VERSION);
    if (envStat == JNI_EDETACHED) {
        jint res = jvm->AttachCurrentThread((void**)&env, NULL);
        assert (res == JNI_OK);
    }
    return env;
}

void JNIHandler::initializeJavaReferences()
{
    if(areJavaReferencesInitialized) return;
    initExceptionHandling();
    initBridgeObject();
    registerNatives();
    areJavaReferencesInitialized = true;
}
void JNIHandler::initBridgeObject()
{
    JData::JIgZorroBridgeClass = env->FindClass(JData::IgZorroBridgePath);
    checkJNIExcpetion(env);
    registerClassMethods();
    JData::JIgZorroBridgeObject = env->NewObject(JData::JIgZorroBridgeClass, JData::constructor.methodID);
    checkJNIExcpetion(env);
}
void JNIHandler::initExceptionHandling()
{
    JData::ExceptionClass = env->FindClass(JData::ExcPath);
    JData::excGetName.methodID = env->GetMethodID(JData::ExceptionClass, JData::excGetName.name, JData::excGetName.signature);
}
void JNIHandler::registerNatives()
{
    JData::JZorroClass = env->FindClass(JData::ZorroPath);
    env->RegisterNatives(JData::JZorroClass, JData::nativesTable, JData::nativesTableSize);
    checkJNIExcpetion(env);
}
void JNIHandler::registerClassMethods()
{
    for(auto *desc : JData::igZorroBridgeMethods)
    {
        desc->methodID = env->GetMethodID(JData::JIgZorroBridgeClass, desc->name, desc->signature);
        checkJNIExcpetion(env);
    }
}
void JNIHandler::checkJNIExcpetion(JNIEnv* env)
{
    jthrowable exc = env->ExceptionOccurred();
    if (!exc) return;
    jclass exccls(env->GetObjectClass(exc));
    jstring name = static_cast<jstring>(env->CallObjectMethod(exccls, JData::excGetName.methodID));
    char const* utfName(env->GetStringUTFChars(name, 0));
    JData::excGetMessage.methodID = env->GetMethodID(exccls, JData::excGetMessage.name, JData::excGetMessage.signature);
    jstring message = static_cast<jstring>(env->CallObjectMethod(exc, JData::excGetMessage.methodID));
    char const* utfMessage(env->GetStringUTFChars(message, 0));
    BrokerError(utfName);
    BrokerError(utfMessage);
    env->ReleaseStringUTFChars(message, utfMessage);
    env->ReleaseStringUTFChars(name, utfName);
    env->ExceptionClear();
}