Calling a adf commandlink (or other java method) from within a outputtext

Is it possible to call a commandLink to call an existing java bean/function within an outputText?
For example:
Say I had an outputText that dumped a /etc/hosts file and I wanted to put in a command link to ping each host and pass the particular IP address to it. What would be the best method for doing that?
135.122.29.122 host1.me.com PingMeLink
135.122.29.117 host2.sd.me.com PingMeLink
So, can I embed this in an outputText somehow or is there a better way to do this?
<af:commandLink text="PingMeLink"
action="#{NetworkController.PingAHost}"/>
Thanks for your help!

That foreach or iterator sounds like a potential solution. I was thinking I could format the output like this:
Host Type Interface IP Address Hostnames Links
Type
Local Host Loopback 127.0.0.1 localhost PingMe
MXX Public 135.9.161.146 r30mss.gbcsitac.avaya.com r30mss PingMe
MXX Private 192.168.1.1 mxx1 PingMe
MYY Public 135.9.161.141 r30mas1.gbcsitac.avaya.com PingMe
MYY Private 192.168.1.250 mas1 r30mas1.30dom.local r30mas1 PingMe
Would my jsp would look something like this?:
<af:foreach var="item" items="#{NetworkController.ipinterfaceList}">
<af:outputText value=#{item.hostType} #{item.InterfaceType} #{item.ipAddress) #{item.hostnames}"/>
<af:commandLink text="PingMe" action=#{NetworkController.PingHost}"/>
</af:foreach>
Would this work? In my backing bean java NetworkController::PingHost code, how do I get the specific item.ipAddress that was clicked on via my link? Is the specific collection item, accessible/passed to my backing been method?
Thanks!

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How can I compile and run other java classes from within an application?

Hello there everyone! I really hope that someone can help me. I am writing a program that must be able to compile and run other java classes that are in different files, much like development environments like Kawa or Forte allow you to do.
There has to be a way of doing this ( I hope!! ), but i can't seem to find it!!
I have tried using this command to compile:
Runtime.getRuntime().exec ("c:\\programs\\javac className.java");
...and this one to run:
Runtime.getRuntime().exec ("c:\\programs\\java className");
...but neither works!!! I can compile and run classes that are in the same file as my application, but I can't get it to work at all for files in different directories or files.
PLEASE, PLEASE, PLEASE help me - i've run out of ideas, and i need this to be working in 3 days!!!
Thank you very much for any help anyone can give me, I really appreciate it!! Thanks again!!
Adrian ( ...in distress!! )

public class JavaCompiler{
   public static void main(String[] args)throws Exception{ //sorry bout the laziness
      if(args == null || args.length != 1){
         System.out.println("Usage: java JavaCompiler MyClass.java");
         System.exit(0);
      String className = args[0];
      Runtime rt = Runtime.getRuntime();
      Process p = rt.exec("javac " + className); //consider setting cpath for this
      p.waitFor();
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      p = rt.exec("java " + className.substring(0, (className.length() - ".java".length()));
      p.waitFor();
      //do some other stuff
}This should get you going. You may consider looking into the System.getProperty() method in order to determine the type of OS it is running on in order to findo out what command to run. I know that the sun tool listed above is nice, but by my understanding the sun tools provided are not guaranteed to stay the same. I'm no expert on this matter, but that is one of the reasons there is no API documentation for those tools. Also, I don't believe those tools come packaged with the JRE. (Of course if you are making an IDE it will be expected that the user has an sdk installed. Good luck with figuring this thing out.

Call java method from button in UIX page

Greetings,
I want to call a java method from a button on a uix page.
Does it have to be a submit button or it maybe a simple button.
If it was from a JSP page, it would be a much more different process ?
This method should delete a row from another view (View2).
delete from tableB ta where ta.field1 = &1
My question is how do I build the method to delete a row and how do I invoke the method using the button ?
Thanks

This sounds like a JDeveloper/ADF issue that is not related to JHeadstart. Can you please log a TAR at MetaLink ( http://metalink.oracle.com/ ), or ask this question at the JDeveloper forum at http://otn.oracle.com/discussionforums/jdev.html ?
Thanks,
Sandra Muller
JHeadstart Team
Oracle Consulting

How to call two RFC in a single JAVA method.

Dear all,
I just want to know that how to call two RFC in a single java method which is defined in CRM implementation file. I'm using NWDS as the customization IDE & working on ISA 7.0.

Hi Sunil,
In the Backend Implementation class, in any method you can call multiple RFCs.
It will be the same way as you do for the single RFC call.
Following syntax is for your reference.
Get the JCO connection
JCoConnection connection = getDefaultJCoConnection();
JCO.Function func = connection.getJCoFunction("ZXXXXXXX");
set the import parameters
Execute it.
connection.execute(func);
get the data from export / table parameters
Now call the second RFC
func = connection.getJCoFunction("ZYYYYYYYYYY");
set the import parameters
Execute it.
get the data from export / table parameters
close the connection
Hope this will help you.
-Chandra.
Edited by: Chandra Sekhar Seeli on Jan 13, 2011 2:04 PM

How to call java method from actionscript

I've just now started working on Flex. May be its basic question but I’m not aware of it – how can I call a java method from actionscript. I want to call some java method on double click of a event. Can you please let me know how to proceed on this?

OK. So, I think we can all conclude that you don't need to call any Java method, can't we? And, that wfUpdateMetadata is the command that will update your metadata.
Now, the question is what are its arguments. It has two - the first is the name of a custom metadata field to be updated (let's suppose that one field is called xMinorVersion, and the other xMajorVersion), the other is the new value, e.g. <$wfUpdateMetaData("xMinorVersion", "New value.")$>As for new value - do you insist on using strings? Since you want to increase the value, it would be more convenient to work with numbers. For instance, with integers you could go with <$wfUpdateMetaData("xMinorVersion", xMinorVersion + 1)$>With strings you will need to convert it to numbers and back to strings. Besides, what happens if you have more than 100 minor versions? (you mentioned you want to add 0.01, but that would finally increase the major version, wouldn't it?) So, I think these two numbers are independent (perhaps, with exception that increase on the major version set the minor version to .00).
If you want to present it, you can use profiles that will construct for you the representation 2.304 out of MajorVersion = 2, MinorVersion = 304
Solved?

How to call java method from xsl

hi friends,
How to call a java method from xsl, i have a xsl file which will call the java method and retrieve the value and display it to the user. but its work well when i set xalan.jar and xerces.jar and the java class files in my classpath and run as
java org.apache.xalan.xslt.Process -in navigate.xml -xsl nav-exst.xsl -HTML -out navoutpage.html[b]
in the command prompt but when i deploy it as web application it gives error as
[b]Namespace 'MyPack' does not contain any functions[b]

OK. So, I think we can all conclude that you don't need to call any Java method, can't we? And, that wfUpdateMetadata is the command that will update your metadata.
Now, the question is what are its arguments. It has two - the first is the name of a custom metadata field to be updated (let's suppose that one field is called xMinorVersion, and the other xMajorVersion), the other is the new value, e.g. <$wfUpdateMetaData("xMinorVersion", "New value.")$>As for new value - do you insist on using strings? Since you want to increase the value, it would be more convenient to work with numbers. For instance, with integers you could go with <$wfUpdateMetaData("xMinorVersion", xMinorVersion + 1)$>With strings you will need to convert it to numbers and back to strings. Besides, what happens if you have more than 100 minor versions? (you mentioned you want to add 0.01, but that would finally increase the major version, wouldn't it?) So, I think these two numbers are independent (perhaps, with exception that increase on the major version set the minor version to .00).
If you want to present it, you can use profiles that will construct for you the representation 2.304 out of MajorVersion = 2, MinorVersion = 304
Solved?

How to call Java method from XSLT??

Hi All,
Jdev 11.1.1.3.0
I have a requirement to implement that, I have to call Java method from XSLT. Could anyone please suggest to implement that??
Thanks,
Santosh M E

As pointed by others, you must expose your method as a custom function, registering with JDeveloper (for development time) as well as with SOA Suite (for runtime).
In the link below you will find a simple step by step example:
https://blogs.oracle.com/reynolds/entry/building_your_own_path
Regards,
Luis F. Heckler

How to call java method from workflow script?

Hi
I have a requirement of updating field value 'Document Status' based on review/approve of content from Workflow and hence need to update the version number. For that I need to call my java method from workflow during submit of review/approve condition. Please let me know how to call java method from workflow?
Is there any alternative better way to achive this requirement from workflow? Please suggest.
Thanks,
Sarang

OK. So, I think we can all conclude that you don't need to call any Java method, can't we? And, that wfUpdateMetadata is the command that will update your metadata.
Now, the question is what are its arguments. It has two - the first is the name of a custom metadata field to be updated (let's suppose that one field is called xMinorVersion, and the other xMajorVersion), the other is the new value, e.g. <$wfUpdateMetaData("xMinorVersion", "New value.")$>As for new value - do you insist on using strings? Since you want to increase the value, it would be more convenient to work with numbers. For instance, with integers you could go with <$wfUpdateMetaData("xMinorVersion", xMinorVersion + 1)$>With strings you will need to convert it to numbers and back to strings. Besides, what happens if you have more than 100 minor versions? (you mentioned you want to add 0.01, but that would finally increase the major version, wouldn't it?) So, I think these two numbers are independent (perhaps, with exception that increase on the major version set the minor version to .00).
If you want to present it, you can use profiles that will construct for you the representation 2.304 out of MajorVersion = 2, MinorVersion = 304
Solved?

How to call java method from C ?

Hello,
I try to call a native method from java which calls java method from the same class. Exception (noSuchMethodError) is thrown. Any ideas?
Thanx in advance !
here is the source of the native method :
JNIEXPORT jint JNICALL Java_TestDll_Proc_1Mul_1Int_1Var_1Var_1Stdcall (JNIEnv * env, jclass jcl, jint jarg1, jint jarg2) {
int arg1;
int arg2;
int arg3;
jint res;
char * ch = "test";
jfieldID fid;
jmethodID mid;
int (* procedure) (int *, int * ,int *);
int mch;
arg1 = (int )jarg1;
arg2 = (int )jarg2;
procedure = GetProcAddress(libraryHandle,"Proc_Mul_Int_Var_Var_Stdcall");
procedure(&arg1,&arg2,&arg3);
res = (jint) arg3;
printf("(*env)->GetMethodID(env, jcl, \"test\", \"()V\");\n");
mid = (*env)->GetMethodID(env, jcl, "test", "()V");
printf("(*env)->CallVoidMethod(env, jcl, mid);\n");
(*env)->CallVoidMethod(env, jcl, mid);
return res;
here is the source of the java file:
public class TestDll {
static {
System.loadLibrary("testdllwrap");
System.out.println("java: Library testdllwrap.dll loaded");
public TestDll() {
public native int Proc_Mul_Int_Var_Var_Stdcall(int jarg1, int jarg2);
public void test() {
System.out.println("java: test()");
public static void main(String[] args) {
TestDll access = new TestDll();
int a = 5;
int b = 6;
int c = 0;
System.out.println("Calling Proc_Mul_Int_Var_Var_Stdcall");
c = access.Proc_Mul_Int_Var_Var_Stdcall(a,b);
System.out.println("Java Result = " + c);

Something is wrong with the code you posted here.
Since your native method is not static, it should have the jobject instance as a parameter in the function prototype, not a jclass. Also, you should be calling CallObjectMethod with a jobject, not jclass.
Check out Jace at http://jace.reyelts.com/jace.
To call the java method you would do:
JNIEXPORT jint JNICALL Java_TestDll_Proc_1Mul_1Int_1Var_1Var_1Stdcall
(JNIEnv * env, jobject jTestDll, jint jarg1, jint jarg2) {
TestDll testDll( jTestDll );
testDll.test();
}God bless,
-Toby Reyelts

Calling more than a Java method from C++

Hi everyone,
I haven't found any example with infomation about calling a second Java method from C++,after creating a VM from C++ also.
Here is the code I'm testing:
JNIEnv *env;
JavaVM *jvm;
JDK1_1InitArgs vm_args;
jint res;
jclass cls;
jmethodID mid;
jobject jobj;
char classpath[1024];
vm_args.version = 0x00010001;
JNI_GetDefaultJavaVMInitArgs(&vm_args);
sprintf(classpath, "%s%c%s",
vm_args.classpath, PATH_SEPARATOR, USER_CLASSPATH);
vm_args.classpath = classpath;
res = JNI_CreateJavaVM(&jvm,(void **)&env,&vm_args);
if (res < 0) {
fprintf(stderr, "Can't create Java VM\n");
exit(1);
cls = env->FindClass("Consola");
if (cls == 0) {
fprintf(stderr, "Can't find Prog class\n");
exit(2);
mid = env->GetMethodID(cls, "<init>", "()V");
if (mid == 0) {
fprintf(stderr, "Can't find Prog.main\n");
exit(3);
jobj = env->NewObject(cls, mid);
if (jobj == 0) {
fprintf(stderr, "Can't find Prog.main\n");
exit(4);
jmethodID mid2 = env->GetMethodID(cls, "isVisible", "()Z");
if (mid2 == 0) {
fprintf(stderr, "Can't find Prog.main\n");
exit(5);
jboolean b = env->CallBooleanMethod(cls, mid);
All works fine till the last line.
Folowing message appears in screen running the last code line:
Runtime error!
Program: s:\client\mcc_cyg\debg\debug\debgnt.exe
abnormal program termination
What to do ?
Thanks in advance.
Ignasi Villagrasa.

There should be examples of this in the JNI tutorial.
Also suggest a book: essential JNI by Rob Gordon
Briefly, what you need is a reference to the JVM. (I assume you have this - either because it was given to you when your C code started the JVM, or because it was passed as an argument to your native method.)
With the reference, you can look up a class, and look up a method, and call the method.
What about an object reference?
o You can call a method on an object which was passed to your native method.
o You can ask one object for a reference to another object.
o You can call a java constructor, which will return a reference.

Problem calling a Java Method from C++

hi everyone,
i'm using JNI and i'm trying to call a Java method from C++, this is the code:
SocketC.java
public class SocketC
private native void conectaServidor();
private void recibeBuffer()
System.out.println("HELLO!!!");
public static void main(String args[])
SocketC SC = new SocketC();
SC.conectaServidor();
static {
System.loadLibrary("Server_TCP");
Server_TCP.cpp
char* recibirSock()
     int _flag = 1;
     while(_flag != 0)
          memset(buffer,0,sizeof(buffer));//Et la, celle pour recevoir
          recv(sock,buffer,sizeof(buffer),0);
          printf(" Mensaje del cliente: %s\n",buffer);
          _flag = strcmp(buffer,"salir");
     }//fin while
     return buffer;
void enviarSock()
     int _flag = 1;
     getchar();
     while(_flag != 0)
          memset(buffer,0,sizeof(buffer));//procedimiento para enviar
          printf("\n Escriba: ");
          gets(buffer);
     //     err=scanf("%s",buffer);
          send(sock,buffer,sizeof(buffer),0);
          _flag = strcmp(buffer,"salir");
     }//fin while
}//fin enviarSock
DWORD servicio(LPVOID lpvoid)//
     char *buf;
     printf("\n Cliente aceptado!!!!!\n");
     buf=recibirSock();
     return 0;
JNIEXPORT void JNICALL Java_SocketC_conectaServidor(JNIEnv *env, jobject obj)
//void main()
/*this is the problem i'm calling the method recibeBuffer*/
     jclass cls = env->GetObjectClass(obj);
     jmethodID mmid = env->GetMethodID(cls, "recibeBuffer", "(V)V");
     if (mmid == 0)
          return;
     env->CallVoidMethod(obj, mmid); //llama a Java
     WSAStartup(MAKEWORD(2,0),&wsa);//MAKEWORD dit qu'on utilise la version 2 de winsock
     printf("TCP conexion Sockets\n\n");
     //estimez vous heureux que je foute pas de copyright ;)
     system("TITLE TCP Conexion Sockets (Version server)");
     //fo avouer que c'est plus joli
     int port;
     printf("Port : ");//On demande juste le port, pas besoin d'ip on est sur un server
     scanf("%i",&port);
     sinserv.sin_family=AF_INET;     //Je ne connais pas d'autres familles
     sinserv.sin_addr.s_addr=INADDR_ANY;//Pas besoin d'ip pour le server
     sinserv.sin_port=htons(port);
     server=socket(AF_INET,SOCK_STREAM,0);//On construit le server
     //SOCK_STREAM pour le TCP
     bind(server,(SOCKADDR*)&sinserv,sizeof(sinserv));
     //On lie les parametres du socket avec le socket lui meme
     listen(server,SOMAXCONN);//On se met � �couter avec server, 0 pour n'accepter qu'une seule connection
     printf(" Servidor conectado.");
     while(1)
          sinsize=sizeof(sin);
          if((sock=accept(server,(SOCKADDR*)&sin,&sinsize))!=INVALID_SOCKET)
          {//accept : acepta cualquier conexion
               if (hReadThread = CreateThread (NULL, 0, (LPTHREAD_START_ROUTINE)
               servicio, 0, 0, &dwThreadID))
                    printf("\nHOLA!");
                    GetExitCodeThread(hReadThread,&dwExitCode);
                    CloseHandle (hReadThread);
               else
                    // Could not create the read thread.
                    printf("No se pudo crear");
                    exit(0);
when i'm running the proyect i get this error:
C:\POT Files\UCAB\tesis\esmart\french>java SocketC
Exception in thread "main" java.lang.NoSuchMethodError: recibeBuffer
at SocketC.conectaServidor(Native Method)
at SocketC.main(SocketC.java:16)
i don't know why this is happening i got declare the method recibeBuffer in my SocketC.java class, but doesn;t work can anyone help me?
PD: sorry for my bad english i'm from Venezuela

Next time please paste your code between [code] tags with the code button just above the edit message area.
To answer your question, you wrote the wrong method signature. It should be:jmethodID mmid = env->GetMethodID(cls, "recibeBuffer", "()V");Regards

Problem calling java method from c

Hi ,
I'm trying to call a java method from a C program. it gives no error during compilation as well as building the application. but when i tried to create the JVM by running my application it pops up the message "The application failed to start because jvm.dll was not found. Re-installing the application may fix the problem." I tried out setting all the environment variables to include the jvm.dll(PATH set to c:\j2sdk1.4.2_05\bin;c:\j2sdk1.4.2_05\jre\bin). Still got the same message. Then i re-installed java platform once more. Even now i get the same error. I have more than one jvm.dll at locations jre\bin\client and server, oracle has some jvm.dll . Will that be a problem? if so can i remove those? which of them should be removed and how?
The code i'm using is
#include <stdio.h>
#include <jni.h>
#include <windows.h>
//#pragma comment (lib,"C:\\j2sdk1.4.2_05\\lib\\jvm.lib")
JavaVM jvm; / Pointer to a Java VM */
JNIEnv env; / Pointer to native method interface */
JDK1_1InitArgs vm_args; /* JDK 1.1 VM initialization requirements */
int verbose = 1; /* Debugging flag */
FARPROC JNU_FindCreateJavaVM(char *vmlibpath)
HINSTANCE hVM = LoadLibrary("jre\\bin\\server\\jvm.dll");
if (hVM == NULL)
return NULL;
return GetProcAddress(hVM, "JNI_CreateJavaVM");
void main(int argc, char **argv )
JavaVM jvm = (JavaVM )0;
JNIEnv env = (JNIEnv )0;
JavaVMInitArgs vm_args;
jclass cls;
jmethodID mid;
jint res;
FARPROC pfnCreateVM;
JavaVMOption options[4];
// jint (__stdcall pfnCreateVM)(JavaVM *pvm, void **penv, void *args) = NULL;
options[0].optionString = "-Djava.compiler=NONE"; /* disable JIT */
options[1].optionString = "-Djava.class.path=c:/j2sdk1.4.2_05/jre/lib/rt.jar"; /* user classes */
options[2].optionString = "-Djava.library.path=lib"; /* set native library path */
options[3].optionString = "-verbose:jni"; /* print JNI-related messages */
/* Setup the environment */
vm_args.version = JNI_VERSION_1_4;
vm_args.options = options;
vm_args.nOptions = 4;
vm_args.ignoreUnrecognized = 1;
JNI_GetDefaultJavaVMInitArgs ( &vm_args );
pfnCreateVM = JNU_FindCreateJavaVM("jre\\bin\\server\\jvm.dll");
res = (*pfnCreateVM)(&jvm,(void **) &env, &vm_args );
// res = JNI_CreateJavaVM(&jvm,(void **) &env, &vm_args );
/* Find the class we want to load */
cls = (*env)->FindClass( env, "InstantiatedFromC" );
if ( verbose )
printf ( "Class: %x" , cls );
/*jvm->DestroyJavaVM( );*/
Could anyone help me solve this problem as early as possible, bcoz i'm in an urge to complete the project.
Thanks in advance.
Usha.

You either have to add to the system path of where is your jvm.dll is located or explicitly link to jvm.dll call GetProcAddress to obtain the address of an exported function in the DLL.

Calling java method from c function

Hi,
I have been through some forums and tutorials, but nothing helps me yet.
Here's my problem : I want to access java funtion from c function.
<code java>
public class MyClass {
public int oneMethod() {
return 5;
</code java>
<code c++>
void main(int argc, char *argv[]) {
// creation of JVM -> no problem
cls = (env)->FindClass("MyClass");
if (cls != 0) {
// it finds the class
mid = (env)->GetMethodID(cls, "oneMethod", "()I");
if (mid != 0) {
// it finds the method
intReturn = (env)->CallIntMethod(cls, mid);
printf("Result of oneMethod: %d \n", initReturn);
</code c++>
the initReturn gives me 0, and not 5. So what do you think the mistake is ?
Should I pass by the GetClassObject() funtion, but in this case, what object would I pass in reference since I'm using a call from c to java.
Thanks a lot for your response, and Happy new Year to all the comunity.

1. You are - apparently - trying to call a method of a java object.
2. But you are instead making the call on a class.
3. You can do one of the following:
o Pass a reference to the object as you call C.
o Call some other java method (maybe static) that gets you a reference to a java object.
o Use JNI to call a java constructor to create a java object.
o Change your code to get the class object and call a static method.

Call Java Method From C#

I have a complete Java Classes solution working perfectly and i would like to "re-use" it from my new main C# program. Actually, i don't know which process could authorize to invoke Java method from C# method.
Can anybody help me ?
Thanks in advance for your assistance.

If you want a very heavy and inefficient solution you can try this:
- Make your java classes "web services" - it usually requires setting up a web container like Tomcat
- Call the web services in your C# program.
Sometimes my solution could work (for instance, if your Java classes can't be rewritten in C# in a short time, and if they are infrequently called, and if they do a lot of work inside, and if you already has a web container properly set up in your environment).

Call Java Method from Callback function

I am writing a JNI wrapper in c++ for a particular event driven DLL. The DLL makes a network connection to another device and then calls a callback function when events are raised on the device. The DLL has 3 basic functions: connect, disconnect, and registerEventListener. RegisterEventListener takes a function pointer which is called each time an event is raised on the device.
My wrapper DLL exposes connect and disconnect functions via JNI. I can call these functions just fine from my Java code. Now the question... How do I call a Java method from my c++ callback function? I can call a Java method using env->CallXXXMethod(...) from within a function that is accessible to Java but I don't have access to the JNI parameters in my Callback function.
So how do I call a Java method from a callback function? If this cannot be done then what is the "right way" to handle native event notification with JNI?

jschell wrote:
JNI parameters? Meaning what exactly?
General outline of a callback
1. Entry
2. Get the VM, env - there are methods for this
3. Attach the thread
4. Get a java object - how depends on what you are doing, but create it or a static reference.
5. Get the java method
6. Call the java method.That is exactly correct. The callback function is called from a separate thread so using a cached pointer to JNIEnv, obtained from the original native method, crashes the JVM. The jmethodID and jclass objects (which are needed to call the static Java method) can be cached without problem. The following is the code I used to attach the current thread and call my static method.
void MyClass::onEvent(int system_id, char* data)
     //get a pointer to the Java Environment
     JNIEnv *env;
     jvm->AttachCurrentThread((void **)&env, NULL);
     //Call the Java method with the newly aquired data
     jstring js = env->NewStringUTF(data);
     env->CallStaticVoidMethod(cls, mid, system_id, js);
}My last question is about cleanup in this function. When I use NewStringUTF to "convert" my char* to jstring do I need to do anything special to clean up or will the Java garbage collector take care of it since the jstring is being passed to a Java method?
Thanks for you help

Calling a adf commandlink (or other java method) from within a outputtext

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