Simple Question Calling methods from Java files through JSP without JVM

Hi.
I've got a simple question (forigve my newbieness)...
If I'm running Tomcat can I exectue a method in a compiled Java file from a JSP page without having the JVM installed on the server?
Any thoughts or additional comments would be appreciated.
Many thanks.

No... but that's because you can't run Tomcat without
a JVM installed on the server.
If you are running Tomcat, you are running a JVM for
the JSP pages to run in, in which case, yes, the JSP
pages can call the other Java code... as long as it's
in the classpath.Thanks a lot for the replies.
So just to check, if I sign up with a hosting company that offers Tomcat then the JVM will be installed on the server and I can call other Java code as long as it's in the classpath?
I just want to make sure before I sign up with a hosting company =D
Thanks again!

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Calling method from SWF file wtih javascript, when swf file is not loaded in any browser

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Problem accessing variables from java file to JSP page

Hello Everyone,
I have small problem accessing my method variables from my java bean file to a JSP page. can some please take a look and tell me why I can't populate my JSP page, I've been trying all day to get this done!!!
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package dev;
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......How are you declaring the class in your JSP? ... are you instantiating it as a bean using the useBean tag, or just instantiating it in your code like normal.
Maybe you could post the relevant JSP code too?
Hello again,
Only the last string is populating after the file has be tokenized. What I'll like to accomplish is passing the very first string in the file. I did not get too far in the JSP file setup because the code is still in it's testing stage, but any help will be highly appreciated.
Here is the JSP code
<%@page import="dev.*" %>
<%@page session="true" language="java" import="java.io.*" %>
<jsp:useBean id="wagerhist" scope="request" class="dev.RoundDetail2" />
<html>
<head>
<title>Round Detail</title>
<body>
<table width="530" bordercolor="#000000" valign="top">
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What is the syntax for calling function from class file by jsp

does anyone here knows what is the syntax of how to call a function from java class file by javascript code or any way to call it?
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<%=pc.functionName(a,b)%>
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urgent needed...
thx

Jsp's are executed before the Html forms are created and loaded. Dont try to use a java code function calling on a javascript click. You'll have to explicitly redirect it into a servlet where in you can call the function you want.
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I would like to know how to call backing bean method from java script.
I am aware of serverListener and [AjaxAutoSuggest article|http://www.oracle.com/technology/products/jdev/tips/mills/AjaxAutoSuggest/AjaxAutoSuggest.html]
but i am running in to some issues with [AjaxAutoSuggest article|http://www.oracle.com/technology/products/jdev/tips/mills/AjaxAutoSuggest/AjaxAutoSuggest.html]
regarding which i asked for help in other thread with subject ....Question on AjaxAutoSuggest article (Ajax Transactions Using ADF and J...)
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Edited by: mchepuri on Oct 24, 2009 6:17 PM
Edited by: mchepuri on Oct 24, 2009 6:20 PM

Hello,
May know how to submit a button autoamtically on onload of page with clicking a welcome alert box. the submit button has managed button too to show a message on console using SOP.
the problem is.
1. before loading the page a javascript comes on which i clicked ok
2. the page gets loaded and the button is there which gets automatically clicked and the managed bean associated with prints a message on console using SOP.
I m trying to do this through server listener and click listener. the code is(adf jspx page)
<?xml version='1.0' encoding='UTF-8'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
<jsp:directive.page contentType="text/html;charset=UTF-8"/>
<f:view>
<af:document id="d1" binding="#{backingBeanScope.backing_check4.d1}">
<af:form id="f1" binding="#{backingBeanScope.backing_check4.f1}">
<af:commandButton text="commandButton 1"
binding="#{backingBeanScope.backing_check4.cb1}"
id="cb1" action="#{beanCheck4.submit1}"/>
<af:clientListener type="click" method="delRow"/>
<af:serverListener type= "jsServerListener"
method="#{backingBeanScope.backing_check4.submit1}"/>
<f:facet name="metaContainer">
<af:resource type ="javascript">
x=confirm("hi");
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</f:facet>
</af:form>
</af:document>
</f:view>

</jsp:root>
the backing bean code is -----
public class classCheck4 {
public classCheck4() {
public String submit1() {
System.out.println("hello");
return null;
}

Calling javascript method from java

Hi this is sri,
I have one doubt on Java Applets "how to call the javascript method from java Applet".Can u give me the complete sample code for one program(both java applet file and html file also)because i can easily understand the programming flow.
Thanks ,
Srilekha.

It's an extremely important skill to learn how to search the web. Not only will it increase your research and development talents, it will also save you from asking questions that have already been answered numerous times before. By doing a little research before you ask a question, you'll show that you're willing to work and learn without needing to have your hand held the entire time; a quality that is seemingly rare but much appreciated by the volunteers who are willing to help you.
If you've done the research, found nothing useful, and decide to post your question, it's a great idea to tell us that you've already searched (and what methodologies you used to do your research). That way, we don't refer you back to something you've already seen.
To get you started, here's a link...
http://www.google.com/search?q=call+java+from+javascript

How to Call C++ Method from Java

I need to call C++ method from Java.
I have gone through the JNI tuorial , but was not able to pin point things.
I read that :
You have to write JNI c functions which then call your C++ member functions.You need to write a JNI function which will call new on your C++ class.
Now i have java class :
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:
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    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.)

Is it possible to call methods of JAVA objects from ABAP?

Hi all,
Does anyone know if it is possible to call methods of java classes from ABAP?
Regards,
Sukru

Hi,
Yes we can access the classes of JAVA in ABP.
This is posible from version ECC 6 onward with NETWEAVER atrhcitecuture.
Pls go through this link-
http://help.sap.com/saphelp_nw04s/helpdata/en/84/54953fc405330ee10000000a114084/frameset.htm
http://help.sap.com/saphelp_nw04s/helpdata/en/e1/b5443e02a9ab4186a6e1240a9a2455/frameset.htm
Here also we use the JCO connector objects
These clearly show the methods to use JAVA.
<removed_by_moderator_together_with_points>
Regards
Chandralekha
Edited by: Julius Bussche on Jul 8, 2008 5:58 PM

Are DLL methods called as instance or static methods from Java ?

Hi,
I have only a small question.
When I call a C++ DLL method from Java using JNI, do I instantiate it like an object method or is it called as a static method ?
I am asking you this because I will use servlets (Java 1.2.2) to call a DLL. These servlets may run concurrently in any moment, and I pass some data to this DLL. I want to know if there is any possibility of this data becoming corrupt, because of one concurrent servlet rewriting the data another servlet has passed.
Thanks and regards.

The question is not specific enough.
Methods in C/C++ can be qualified with the following forms:
-global (C/C++)
-static member(C++ class method)
-instance member(C++ class method)
Since you didn't provide your code I couldn't possible determine which of the above you are using, but presumably you know.
On the other hand a java native method is either static or non-static depending on how you defined it in the class. Once again without the code there is no way to say and presumably you already know this.
The context of the methods is the same context that a similar servlet method has. But naturally in C/C++ is is easy to circumvent the context - for example by using a global variable.
Data in C/C++ can always become corrupt and in the vast (all?) cases it is because something is wrong in the C/C++ code. Like a pointer that is not initialized, or a pointer used after it is free'd. Or writing past the end of a buffer, or writing before the beginning of a buffer.

Calling a method from another file

This is pretty basic stuff but i can't seem to get it right. I am calling a method from another file. The other file IS located in the same folder BUT when i compile i get errors
"cannot find symbol" <===referring to limit and sieve i believe.
The method name is "sieve" the file name is "PrimeSieve2008" and "limit" is the variable in brackets in the real method.
     public static void main (String [] args) {
final int [] PRIMES;
int sieve = PrimeSieve2008.sieve(limit);
     PRIMES = sieve(getValidInt());
          for (int j = 0; j<PRIMES.length; j++) {
               System.out.println("Prime[" + j + "] = " + PRIMES[j]);
Is "int sieve = PrimeSieve2008.sieve(limit)" the wrong way to call a file?
Thanks a million,
Alex
Edited by: Simplistic2099 on Apr 3, 2008 7:47 PM
Edited by: Simplistic2099 on Apr 3, 2008 7:49 PM

Simplistic2099 wrote:
the other method runs fine:
"public static int[] sieve(final int limit){
int candidate; // possible prime
int count; // no. of primes found
boolean[] mayBePrime = new boolean[limit+1];
// remaining possibilities
final int[] PRIMES; // array to return
// initialize mayBePrime
for ( int j = 0 ; j <= limit ; j++ ) {
mayBePrime[j] = true;
mayBePrime[0] = mayBePrime[1] = false;
// apply sieve, and count primes
candidate = 2;
count = 0;
while ( candidate <= limit ) {
if ( mayBePrime[candidate] ) {
count++;
for ( int j = 2 * candidate ; j <= limit ; j += candidate ) {
mayBePrime[j] = false;
} // end for
} // end if
candidate++;
} // end while
// fill up new array with the primes found
PRIMES = new int[count];
count = 0;
for (int j = 2 ; j <= limit ; j++ ) {
if ( mayBePrime[j] ) {
PRIMES[count] = j;
count++;
} // end if
} // for
return PRIMES;
} // sieve
I really am clueless here.in this one you are passing in limit.
in the other one you are getting limit from somewhere outside of main.

Calling a C++ method from JAVA

Hello together,
I have the following problem. I have to decryp a password in JAVA using a C++ method. I have a dll and the headerfile. It is impossible to change anything at the C++ source. The method is:
long encrypt(
unsigned char * puchClearText,
unsigned char * puchKey,
unsigned char * puchCipherText);
How do I have to call it from JAVA. Is it possible?
Thank you very much for help.
Martin

You need to create a JNI wrapper DLL that will serve as the bridge between the java application and the third party DLL.
The java methods tagged as "native" will call the JNI wrapper DLL functions, which in turn will call the third party DLL functions.
To get acquainted with JNI, you should start by looking at [url http://java.sun.com/developer/onlineTraining/Programming/JDCBook/jni.html]JNI Technology.
While coding, allways have at hand the [url http://java.sun.com/j2se/1.5.0/docs/guide/jni/spec/jniTOC.html]JNI Specification.
Regards

Calling methods from inside a tag using jsp 2.0

My searching has led me to believe that you cannot call methods from in the jsp 2.0 tags. Is this correct? Here is what I am trying to do.
I have an object that keeps track of various ui information (i.e. tab order, whether or not to stripe the current row and stuff like that). I am trying out the new (to me) jsp tag libraries like so:
jsp page:
<jsp:useBean id="rowState" class="com.mypackage.beans.RowState" />
<ivrow:string rowState="${rowState}" />my string tag:
<%@ attribute type="com.mypackage.beans.RowState" name="rowState" required="true" %>
<c:choose>
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          <tr class="ivstripe">
     </c:when>
     <c:otherwise>
          <tr>
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</c:choose>I can access the getter method jst fine. It tells me wether or not to have a white row or a gray row. Now I want to toggle the state of my object but I get the following errors when I try this ${rowState.toggle()}:
org.apache.jasper.JasperException: /WEB-INF/tags/ivrow/string.tag(81,2) The function toggle must be used with a prefix when a default namespace is not specified
Question 1:
Searching on this I found some sites that seemed to say you can't call methods inside tag files...is this true?...how should I do this then? I tried pulling the object out of the pageContext like this:
<%@ page import="com.xactsites.iv.beans.*" %>
<%
RowState rowState = (RowState)pageContext.getAttribute("rowState");
%>I get the following error for this:
Generated servlet error:
RowState cannot be resolved to a type
Question 2:
How come java can't find RowState. I seem to recall in my searching reading that page directives aren't allowed in tag files...is this true? How do I import files then?
I realized that these are probably newbie questions so please be kind, I am new to this and still learning. Any responses are welcome...including links to good resources for learning more.

You are correct in that JSTL can only call getter/setter methods, and can call methods outside of those. In particular no methods with parameters.
You could do a couple of things though some of them might be against the "rules"
1 - Whenever you call isStripeToggle() you could "toggle" it as a side effect. Not really a "clean" solution, but if documented that you call it only once for each iteration would work quite nicely I think.
2 - Write the "toggle" method following the getter/setter pattern so that you could invoke it from JSTL.
ie public String getToggle(){
    toggle = !toggle;
    return "";
}Again its a bit of a hack, but you wouldn't be reusing the isStriptToggle() method in this way
The way I normally approach this is using a counter for the loop I am in.
Mostly when you are iterating on a JSP page you are using a <c:forEach> tag or similar which has a varStatus attribute.
<table>
<c:forEach var="row" items="${listOfThings}" varStatus="status">
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</tr>
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Invoke beanshell methods from java

Hello
I'm learning beanshell and using it to write scripts that are ran in JDK 6.
My question is how to invok beanshell methods from java source codes.
My codes is:
import javax.script.*;
public class InvokeFunctions {
public static void main (String[] args)throws ScriptException, NoSuchMethodException
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inbshEngine.invokeFunction("sayHello");
I defined a method "sayHello()" using beanshell, but i just can't invoke it in Java.
I got an error msg said:
Exception in thread "main" java.lang.IllegalAccessError: tried to access method bsh.NameSpace.getThis(Lbsh/Interpreter;)Lbsh/This; from class bsh.engine.BshScriptEngine
Any one has any idea about it?
Thanks

Look at the Javadoc documentation of IllegalAccessError. It says:
Thrown if an application attempts to access or modify a field, or to call a method that it does not have access to.
Normally, this error is caught by the compiler; this error can only occur at run time if the definition of a class has incompatibly changed.
Maybe recompiling all your sources (make sure you delete all existing *.class files) will help?

Simple Question Calling methods from Java files through JSP without JVM

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