Problem calling Java method from JavaScript in JSP / ADF

Hi all,
In my JavaScript onMouseUp() function, I need to call a method on my Java backing bean. How is this done? Info on the web indicates a static Java method can be called by simply "package.class.staticMethod(...)". but when I put the statement
"jsf.backing.GlobalRetriever.createBasemap(affectedLayer);"
I get an error message "jsf is undefined".
The functionality I'm trying to get is: I have a custom slider control and based on its value, I want to call oracle map viewer specifying a map extent of the (current extent / slider value) to do a zoom in/out. In addition, the slider uses a onMouseMove() function to change the size of the image display so it looks like a dynamic zoom in/out.
Please assist or let me know if I can provide some additional information. Thanks in advance.
Jim Greetham

No. The Java and Javascript in a Faces application are really working in two different universes.
Java is running on the server. It generates HTML (and sometimes even Javascript) and sends that to the client machine. That's where all your backing beans are.
Javascript runs directly in the browser. There's no way anything on the server can have access to anything you define in Javascript, unless you explicitly send that information back to the server, either via standard form submission (which only works when someone presses a "Submit" button) or via an Ajax-type call. So otherwise, nothing you define in Javascript will ever be available to a backing bean.

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Call Java method from JavaScript

Hi,
I have a Java class called abc.java and in that I have a method called assignValue(String value).
I need to call this method, assignValue() , from JavaScript.
Is there a way to call a Java method from JavaScript.
Any help is greatly appreciated.
Thanks.

Yes I did, and I still don't get it, I have created a JSF web application, not an applet, as I posted earlier my code to executes sit's in a class file, not an applet file.
My Page1.class file is as follows
* Page1.java
package a1;
import ....
public class Page1 extends AbstractPageBean {
    public void valset(int val) {
}my jsp file "Page1.jsp" is as follows:
<?xml version="1.0" encoding="UTF-8"?>
<jsp:root version="1.2" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:ui="http://www.sun.com/web/ui">
    <jsp:directive.page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"/>
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                    <ui:form binding="#{Page1.form1}" id="form1">
<applet code="Page1.class" name="Page1" width="1100" height="600">
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Call Java Method From JavaScript Function

hi everyone
i need a help in calling Java method from a javaScript method
ex:
function confirmAddRecord() {
cHours =document.getElementById('frmP:ChargeHours').value;
cSTime =document.getElementById('frmP:ChargeStartTime').value;
var answer = confirm("Are you sure you want to add Record?")
if (answer){
here i want to call the Java Method that is located in session bean that takes the upper params cHours & cSTime
else{
return false;
i know i can do it as an action button but it is required me to be in that way can any one help plz
Message was edited by:
casper77

That depends on the nature of your parameters. I guess you calculate the params on client and then want to submit them. In this case and if you don't want to use Ajax simple add some <input type="hidden"> elements (of course there correspondend components dependent of your framework) and store the params there. If the javascript isn't invoked by a button click, you can use a button nevertheless. Set visible="false" and call
document.getElementById('client_id_of_my_hidden_button').click();
(or maybe doClick() dependent on your framework).

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.

Help with calling java functions from javascript

I am using javax.script to interpret javascript from a java applet. it loads the js file into a string, and then does engine.eval(script_string). My question is, how would I make functions in the class file that are available to javascript?
Update: Instead of that, I am loading a js script that will contain all of the usable functions. Here it is:
//core.js for Javasphere 0.31
var pkgs = new JavaImporter(java.lang, java.lang.System, java.awt);
with(pkgs) {
function Abort(msg) {
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        g = graph.getgraphics();
        g.drawString(msg, 20, 20);
}When I do engine.eval("Abort(\"something\")"); it throws this error:
javax.script.ScriptException: sun.org.mozilla.javascript.internal.EvaluatorException: error instantiating (0): class java.awt.Graphics is interface or abstract (<Unknown source>#8) in <Unknown source> at line number 8

Eggbertx, let's start from scratch if you don't mind. Say you have this Applet
pubic class MyApplet extends Applet
String message;
//CALL THIS METHOD FROM JAVASCRIPT
public void setMessage(String msg)
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public void paint(Graphics g)
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}Then in your HTML file you may have something like this:
<input type="text" id="msg" value=""></input>
<input type="button" value="Set Message" onclick="setAppletMessage()"></input>
<applet id="myApplet" code="MyApplet.class" width="400" height="100"></applet>And in the JavaScript file:function setAppletMessage()
var msg = document.getElementById("msg").value;
document.myApplet.setMessage(msg);
}This is about all you really need to do. See how the Graphics object is no longer in your .js file?
Note: You may run into other difficulties in getting this code to work because of browser, security, or some other pain-in-the-neck issues, but this is the idea.
Eggbertx, I see you added a star to my first post and I think you should take that off because:
1. <tt>Component</tt> is abstract... so you can not call the <tt>new</tt> operator.
2. The call <tt>component.getGraphics()</tt> is not going to work either, because <tt>component</tt> was never created.

Calling Java methods from C program

After a year or so using these excellent forums to answer my queries, without ever having to post a question, I've finally had to ask for help with this one. I've already looked through the JNI tutorial, and these forums, extensively, but I'm still not quite sure of how best to solve my problem.
I need to call Java methods from a C program. I've already used JNI to call a simple C program from Java, and that's fine, but I just can't determine exactly what I need to do for the reverse to work.
What is the definitive solution for calling Java from C? Is it to use the invocation APIs to create a JVM, and then access it through the various GetMethod, FindClass methods? Or can I 'reverse engineer' the process I followed to get Java to call C?? The tutorial is a bit confusing, as the example it gives uses Callback stuff, but I guess that's only useful when you want to go Java-C-Java??
Advice appreciated,
Rich

Forgive my blatant bumping, but anyone, please?

Calling Java Methods from Stored Procedures

Can I call Java Methods from Oracle Stored Procedures? I have a Java framework that logs events and would like to reuse it for logging events that occur in stored procedures.
null

You need to publish java class methods to plsql.
Attached below is some information.
Although both PL/SQL modules and Java classes are stored in the database
and are managed by many of the same mechanisms, each of them resides in
its own namespace. Therefore, Java methods are not accessible from SQL
and PL/SQL by default. In order to expose Java methods to the SQL and
PL/SQL engines, first publish that Java method to the SQL namespace using
a 'Call Spec'.
Note: A 'Call Spec' does not create an additional layer of
execution so there is no performance penalty incurred.
A 'Call Spec' is simply a syntactical mechanism used to
make a method known in the SQL namespace.
The SQL name established by the 'Call Spec' can be top-level or packaged.
The syntax differs only slightly and is consistent with that used for
PL/SQL procedures and packages. For more information on the exact
syntax, see the references listed in 'Related Topics'.
In general, a top-level procedure 'Call Spec' takes the form:
CREATE OR REPLACE PROCEDURE procname ( pname mode ptype, ... )
AS LANGUAGE JAVA NAME 'javaname ( javatype, ... )';
Where: procname is the SQL name you wish to publish
pname is the name for a parameter to procname
mode is the parameter mode (i.e. IN, OUT, IN OUT)
ptype is a valid SQL type (e.g. NUMBER, CHAR, etc.)
javaname is the fully qualified name of the Java method
javatype is a Java type for the corresponding parameter
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Note: Within the NAME clause, everything within quotes is case
sensitive. For example, if the keyword 'return' is in all
CAPS, this Call Spec will not compile.
Other optional parts of this syntax have been omitted here for simplicity.
Additional examples in subsequent sections illustrate some of these options.
eg
CREATE PROCEDURE MyProc (rowcnt IN NUMBER, numrows OUT NUMBER)
AS LANGUAGE JAVA NAME 'MyClass.MyMethod(int, int[])';
There are several important things to note here:
1.) The 'Call Spec' for a JSP must be created in the same schema as the
corresponding Java class that implements that method.
2.) IN parameters are passed by value. This is the only parameter mode
available in Java. OUT parameters, therefore, must be passed as single
element arrays in order to emulate pass by reference.
3.) Parameter names do not need to match, but the number and types of
the parameters must match (with just one exception - see item 5 below).
Oracle 8i supports conversions between an assortment of SQL and Java.
See the references listed in 'Related Topics' for additional information.
4.) Primitive types (e.g. int, float, etc.) are not required to be fully
qualified with any package name. However, standard Java object types
(e.g. String, Integer, etc.) as well as any user defined object types
(e.g. like those generated by JPublisher) must be prefixed with a
corresponding package name (e.g. java.lang) if applicable.
5.) The 'main' method which takes a single String[] parameter can be
mapped to any PL/SQL procedure or function which takes some number
of VARCHAR2 or CHAR type IN parameters. For example, the java method:
public static void main ( String[] args ) { ... }
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PROCEDURE MyProc3 ( arg1 IN CHAR, arg2 IN VARCHAR2 ) ...
PROCEDURE MyProc4 ( arg1 IN VARCHAR2, arg2 IN VARCHAR2 ) ...
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null

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).
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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?
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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 Java Methods from C++

Hi ppl,
I'm a real java newbie but I'm working on a task which requires me to call java methods from a C++ program. Does anyone have any code snippet for me to start of on, say, a c++ prgram which calls a java method that prints "Hello World :oD " to the screen? Many thanks.
Tyler

1. Have you looked at the tutorial?
(Look elsewhere on this website.)
2. Have you considered buying a book?
(Try "essential JNI", by Rob Gordon.)

How to call java program from javascript

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Hi,
I know how to call a method from c/c++ with jni back to Java
but this fails when I try to do this from a native thread.
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Ok, problem has been solved
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Call Java Method from Callback function

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jschell wrote:
JNI parameters? Meaning what exactly?
General outline of a callback
1. Entry
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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).
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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

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