Call Pageflow-Methods in a Java-Expression

Hi!
In Workshop 9.2b, is there a possibility to call a Pageflow-Method with parameters like the following code?
<%= pageFlow.getValue("sample") %>
There is no object "pageFlow", but is it possible to get it from the pageContext?
thanks,
Josef

Hi Vimala
I got it working by the following workaround:
In the onCreate-Method of my PageFlowController, I store the current PageFlow into the Session:
protected void onCreate() {
getSession().setAttribute("currentPageFlow", this);
in the JSP, I added an import for my PageFlowController:
<%@ page import="mypackage.MyPageFlowController"%>
and used the following java-expression to call my method:
<%= ((MyPageFlowController)session.getAttribute("currentPageFlow")).getText("sample") %>
this works fine.
Thanks,
Josef

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Main.javaimport com.jme.app.BaseGame;
import com.jme.input.KeyBindingManager;
import com.jme.input.KeyInput;
import com.jme.math.Vector3f;
import com.jme.renderer.Camera;
import com.jme.renderer.ColorRGBA;
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import com.jme.system.JmeException;
import com.jme.util.Timer;
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>
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http://developer.java.sun.com/developer/qow/archive/104
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I am also giving the code. Please do help me on this. i am a beginner in java.
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You're doing quite a few things that will cause errors, I'm afraid. I'll see if I can help you.
The error you're asking about is caused by the following line:
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maria_eg wrote:
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I read that :
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Java Code JavaClass.java ---->
class JavaClass{
public native void nativeMethod();
    static
        System.loadLibrary("NativeCppCode");
     private void callCppMethod()
          //call C++ method
                JavaClass jvc = new JavaClass();
                jvc.nativeMethod()
}Cpp Code:
NativeCppCode.h---->
class NativeCppCode
public:
    getValue();
    setValue();
private:
   int a;
JNIEXPORT void JNICALL Java_JavaClass_nativeMethod(JNIEnv *env
               ,jobject obj);NativeCppCode.C---->
NativeCppCode::getValue()
   return a;
NativeCppCode::setValue()
   a = 1;
JNIEXPORT void JNICALL Java_JavaClass_nativeMethod(JNIEnv *env
               ,jobject obj)
NativeCppCode* nativeInstabce = new NativeCppCode();
NativeCppCode.setValue();
}Is this the correct way to do it.
Any suggestion would be a great help to me

tryit wrote:
I need to call C++ method from Java.Not possible.
JNI uses C methods.
Is this the correct way to do it.Same way you would do it in any C/C++ method (not java)
       MyClass* p = ....
       p->doit();
Common idiom for the pointer in the above is to pass it back and forth to your java code as a java long. You cast it it and from your class pointer. Provide an explicit java method to free it when done. Besides providing the explicit method also implement a finalizer to free it as well (however that is a fail safe and should not be relied upon.)

How to return a object from a method in a java program to a C++ call (JNI )

Sir,
I am new to java and i have been assigned a task to be done using JNI.
My question is,
How can i return an object from a method in a java program to a call for the same method in a C++program using JNI.
Any help or suggesstions in this regard would be very useful.
Thanking you,
Anjan Kumar

Hello
I would like to suggest that JNI should be your last choice and not your first choice. JNI is hard to get right. Since the JNI code is executing in the same address space as the JVM, any problems (on either side) will take down the entire process. It dilutes the Write Once Run Anywhere (WORA) value proposition because you need to provide the JNI component for all hardware/OS platforms. If you can keep your legacy code(or whatever you feel you need to do in JNI) in a separate address space and communicate via some inter-process channel, you end up with a system that is more flexible, portable, and scalable.
Having said all that, head over to the Java Native Interface: Programmer's Guide and Specification web page:
http://java.sun.com/docs/books/jni/
Scroll down to the Download the example code in this book in ZIP or tar.gz formats. links and download the example source. Study and run the example sources. The jniexamples/chap5/MyNewString demo creates a java.lang.String object in native code and returns it to the Java Language program.

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