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    <p>There's way to read a java object fields:</p> <pre><code>jint _JMETHODNAME(MyClass,myMethod) (JNIEnv *env, jclass jcMyClass, jobject joMyObject) { //Get the class jcMyObjectClass = env-&gt;FindClass("test/native/MyObject"); if (jtException = env-&gt;ExceptionOccurred()) { //Error management } if (jcMyObjectClass == NULL) { //Error management } //Check if the class matchs the object jboolean jbFlag = env-&gt;IsInstanceOf(joMyObject,jcMyObjectClass); if (jtException = env-&gt;ExceptionOccurred()) { //Error management } if (jbFlag == JNI_FALSE) { //Error management } //Get a field jfieldID jfIdentField = env-&gt;GetFieldID(jcMyObjectClass,"fieldName","Ljava/lang/String;"); if (jtException = env-&gt;ExceptionOccurred()) { //Error management } if (jfIdentField == NULL) { //Error management } //Read a field jstring jsMyString = (jstring)env-&gt;GetObjectField(joMyObject,jfIdentField); if (jtException = env-&gt;ExceptionOccurred()) { //Error management } if (jsMyString == NULL) { //Error management } //Convert to C++ format LPCTSTR strMyString = (LPTSTR)env-&gt;_tGetString(jsMyString, NULL); jsize myStringLen = env-&gt;_tGetStringLength(jsMyString); if (strMyString == NULL) { //Error management } } </code></pre> <p>So you can use a Java Object as parameter and convert it to a C structure if you want.</p> <p>Maybe this helps you.</p> <p>For a selfreferenced object you can go through all of them like this:</p> <pre><code>//Get a field jfieldID jfIdentField = env-&gt;GetFieldID(jcMyObjectClass,"selfReference","test/native/MyObject"); if (jtException = env-&gt;ExceptionOccurred()) { //Error management } if (jfIdentField == NULL) { //Error management } //Read a field jobject joNextMyObject = (jstring)env-&gt;GetObjectField(joMyObject,jfIdentField); if (jtException = env-&gt;ExceptionOccurred()) { //Error management } while (joNextMyObject != NULL) { //Process object //Read a field joNextMyObject = (jstring)env-&gt;GetObjectField(joNextMyObject,jfIdentField); if (jtException = env-&gt;ExceptionOccurred()) { //Error management } } </code></pre>
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    1. POhow to call a native method with user defined datatypes as its parameters from java?
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    1. USraven1981
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    1. COwhat if i have self referential pointer as one of the member of the structure of C.
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      1. USjohnkrishna
    2. COYou can have a self referential object in java as well, and go through it
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    3. COI put direct fields access because is simplier, but you can use methods as well if you want
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