Can we call a java method from python

Hi, Can we invoke a java application from python. If yes, can any of you post a sample python script. Also please specify any links if you find useful for this. I do not want to use either Jython or any others for this. I would like to do it particularly from Python.
Thanks.

For Perl there was a module that allows to access java classes there might be a one for python too do a goole search

Similar Messages

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

How can I call a java object from Web dynpro ABAP application?

I made Web dynpro ABAP application and posted it to SAP EP.
For certain business purpose, we need to call external 3rd party java object using 3rd party's java api in Web dynpro application.
Is there anybody who experienced this kind of java interface issue?
I know Web dynpro Java environment can fully support this kind of requirement. but regarding Web dynpro ABAP, I couldn't find any clue for this.
Any comment or suggestion would be greatly appreciated.
Thanks,
Raymond, ABAP Consultant

if you have jco configured, then you can make calls to java api from ABAP .
check out this weblog.
/people/gregor.wolf3/blog/2004/08/26/setup-and-test-sap-java-connector-outbound-connection
Raja

How to call a C function calling a Java Method from another C function ?

Hi everyone,
I'm just starting to learn JNI and my problem is that I don't know if it is possible to call a C function calling a Java Method (or doing anything else with JNI) from another C function.
In fact, after receiving datas in a socket made by a C function, I would like to create a class instance (and I don't know how to do it too ; ) ) and init this instance with the strings I received in the socket.
Is all that possible ?
Thank you very much for your help !

Hard to understand the question, but by most interpretations the answer is going to be yes.
You do of course understand that JNI is the "API" that sits between Java and C and that every call between the two must go through that. You can't call it directly.

How can I call a java class from within my program?

I was wondering if there's a platform independent way to call a java class from my program.

Here's my scenario. I'm working on a platform independent, feature rich, object-oriented command prompt program. The way I'm designing it is that users can drop classes they write into my bin directory and gain access to the class through my program. For example, they drop a class named Network.class in the bin directory. They would type Network network at my command prompt and gain access to all the methods available in that class. They can then type system.echo network.ipaddress() at my prompt and get the system's ip address. I have it designed that there's a server running in the background and the clients connect to my port. Once connected the end-user can enter their user name and password and gain access to the system. When they type a command they actually call another java program which connects to my server using a seperate thread. They can then communicate back and forth. I have it set that everything has a process id and it's used to keep track of who called what program. Once the program is done it disconnects and closes. Rather than getting into the nitty gritty (I didn't want to get into heavy detail, I know how everything will work) I'm really interested in finding out how I can call a java program from my program. I don't want it to be part of the app in any way.

Can I call a Java program from a SQL Server Trigger?

Hello,
I want to encrypt some data in a database column in SQL Server. Today I am using java code to encrypt the value and store it in the database using JDBC.
Now I want to use a VB client to store the encrypted value in the SQL Server DB. Since the encryption is handled by a java class, can I write a trigger in SQL Server that while inserting the raw data, calls the java class for encrypting the value and then inserts the encrypted value into the column?
In general, is it possible to call a java class from a SQL Server trigger?
Thanks
Bipin

Here are 3 examples of code for insert, update and delete:
CREATE TRIGGER [PLI_INSERT_TRIGGER] ON [dbo].[PLI]
FOR INSERT
AS
Declare @cmd sysname, @code sysname, @list sysname
     Select @code = PLI_K_COD, @list = PLI_K_LISTINO from inserted
     Set @cmd = 'java mirrorDb.Copy PLI INSERT ' + @code + ' ' + @list
     EXEC master..xp_cmdshell @cmd
CREATE TRIGGER [PLI_UPDATE_TRIGGER] ON [dbo].[PLI]
FOR UPDATE
AS
Declare @cmd sysname, @code sysname, @list sysname
     Select @code = PLI_K_COD, @list = PLI_K_LISTINO from inserted
     Set @cmd = 'java mirrorDb.Copy PLI UPDATE ' + @code + ' ' + @list
     EXEC master..xp_cmdshell @cmd
CREATE TRIGGER [PLI_DELETE_TRIGGER] ON [dbo].[PLI]
FOR DELETE
AS
Declare @cmd sysname, @code sysname, @list sysname
     Select @code = PLI_K_COD, @list = PLI_K_LISTINO from deleted
     Set @cmd = 'java mirrorDb.Copy PLI DELETE ' + @code + ' ' + @list
     EXEC master..xp_cmdshell @cmd
you must go "sql server entreprise manager" right click on the table you want to add triggers and select: all activities, manage triggers.
You have 3 examples: for an insert, for an update and for a delete
ON [dbo].[PLI] specify the table on which you want to setup trigger.
FOR DELETE, INSERT, UPDATE specify the event.
The Declare statement create the variables in which I want to put some values to pass to the java program, for example which table, which event, which key fields.
the "Select @code = PLI_K_COD, @list = PLI_K_LISTINO from inserted" set the variables with the value of the columns of the table I am interested to read from my java program, for example the variable @code receive the value of the column pli_k_kod (is the key) of the table PLI.
The "Set @cmd = 'java mirrorDb.Copy PLI DELETE ' + @code + ' ' + @list " prepared the variable @cmd with the java command followed by the package.classname and parameters.
The EXEC launch the command to the operating system.
Daniele

Why I can't call my native method from my package?

it is fine if my java code didn't complied into a package.
But if I complied my java code as a package, and call its native method outside. It give me "UnsatisfiedLinkError". And can not find my method. It is indeed the method is inside.
Thank a lot any helps. Email me on [email protected]

I have found that javah does not generate the correct JNI function names when the native function is in a class that is within a Java package. The net result is an Unsatisfied link error.
The JNI function name must be included in the package name. The naming is a bit complicated and that's why javah should be used, except in this case it does not work. I can't quite remember exactly how it works, something like adding in packagename_1 into the JNI name. The SWIG tool (http://www.swig.org) does generate the correct names when using packages. It is a tool which takes C or C++ header files and generates the JNI and Java classes for you so that you can call C/C++ code from Java. Once you have installed SWIG and run 'make check', have a look in the directory Examples/test-suite/java for the JNI naming for packages. I'll try remember to post the exact naming if you don't want to install SWIG.

How can I call a component method from OCAP ?

I'll try to invoke Cold Fusion Component from Xlet (OCAP App), specifically I wan to invoke a query from Component(CFC) method.
Somebody knows how to... or any idea or comments.
Thank you so much!

Actually, as long as the servlet returns valid javascript, you can indeed "call it" from the client. It will initiate a request and return the result to the browser.
This example uses Perl, but it could be easily modified to go to a servlet instead.
Note that it is only supported in DOM browsers (IE6+/NN6+/etc)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html>
<head>
<title> Test server-side JS </title>
</head>
<body>
<script type="text/javascript">
function checkIt(variable, value)
var newScript = "cgi-bin/validateJS.cgi?"+variable+"="+value;
var body = document.getElementsByTagName('body').item(0)
var scriptTag = document.getElementById('loadScript');
if(scriptTag) body.removeChild(scriptTag);
script = document.createElement('script');
script.src = newScript;
     script.type = 'text/javascript';
     script.id = 'loadScript';
     body.appendChild(script)
</script>
<p>Test.</p>
<form id="f1" action="">
<input type="text" name="t1" id="t1" onChange="checkIt(this.name, this.value)">
</body>
</html>
validateJS.cgi
#!/opt/x11r6/bin/perl
use CGI qw(:all);
my @valArray = split(/=/,$ENV{QUERY_STRING});
print "Content-type: text/javascript\n\n";
# myPass is the password
$myPass = "foobar";
if ("$valArray[1]" eq "$myPass")
print "alert(\"Success!!\")";
else
print "alert(\"Failure!!\")";

How can I call a servlet method from a javascript function

I want to call l a servlet method from a javascript function.
Does any one have an example of code.
Thinks in advance

Actually, as long as the servlet returns valid javascript, you can indeed "call it" from the client. It will initiate a request and return the result to the browser.
This example uses Perl, but it could be easily modified to go to a servlet instead.
Note that it is only supported in DOM browsers (IE6+/NN6+/etc)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html>
<head>
<title> Test server-side JS </title>
</head>
<body>
<script type="text/javascript">
function checkIt(variable, value)
var newScript = "cgi-bin/validateJS.cgi?"+variable+"="+value;
var body = document.getElementsByTagName('body').item(0)
var scriptTag = document.getElementById('loadScript');
if(scriptTag) body.removeChild(scriptTag);
script = document.createElement('script');
script.src = newScript;
     script.type = 'text/javascript';
     script.id = 'loadScript';
     body.appendChild(script)
</script>
<p>Test.</p>
<form id="f1" action="">
<input type="text" name="t1" id="t1" onChange="checkIt(this.name, this.value)">
</body>
</html>
validateJS.cgi
#!/opt/x11r6/bin/perl
use CGI qw(:all);
my @valArray = split(/=/,$ENV{QUERY_STRING});
print "Content-type: text/javascript\n\n";
# myPass is the password
$myPass = "foobar";
if ("$valArray[1]" eq "$myPass")
print "alert(\"Success!!\")";
else
print "alert(\"Failure!!\")";

How can i call a taskflow methode from backing bean ??

Build JDEVADF_11.1.1.3.PS2_GENERIC_100408.2356.5660
i like to call a Methode (taskflow) from backing bean!
my bean code :
    public void imageLinkActionListner(ActionEvent actionEvent) {
        String              id      = actionEvent.getComponent().getId();
        int                 linkID = Integer.parseInt(id.substring(4));
        DCBindingContainer bc      = (DCBindingContainer)ADFUtils.getBindingContainer();
        DCTaskFlowBinding   tf      = null;
        System.out.println("Region Change...."+id+" INT "+linkID);
        switch (linkID) {
            case LINK_CALENDAR_REGION:
                tf = (DCTaskFlowBinding)bc.findExecutableBinding("calendartaskflowPage");
            break;
            case LINK_MAIL_REGION:
                tf = (DCTaskFlowBinding)bc.findExecutableBinding("mailtaskflowPage");
            break;
          case LINK_ADDRESS_REGION:
              tf = (DCTaskFlowBinding)bc.findExecutableBinding("addresstaskflowPage");
          break;
          case LINK_BLOGS_REGION:
              tf = (DCTaskFlowBinding)bc.findExecutableBinding("blogstaskflowPage");
          break;
          case LINK_MAPS_REGION:
              tf = (DCTaskFlowBinding)bc.findExecutableBinding("mapstaskflowPage");
          break;
        default:
            return;
        if (tf != null){
            uiMainRegion.setRegionModel(tf.getRegionModel());
            uiMainRegion.setValue(tf.getRegionModel());
            tf.getExecutableBindings();
            AdfFacesContext.getCurrentInstance().addPartialTarget(uiMainRegion);
    }i like to call *#{backingBeanScope.mapBean.initMap}*
my taskflow source
<?xml version="1.0" encoding="windows-1252" ?>
<adfc-config xmlns="http://xmlns.oracle.com/adf/controller" version="1.2">
<task-flow-definition id="map-task-flow">
    <default-activity id="__1">map</default-activity>
    <view id="map">
      <page>/map/map.jsff</page>
    </view>
    <method-call id="initMap">
      <method>#{backingBeanScope.mapBean.initMap}</method>
      <outcome id="__7">
        <fixed-outcome>init</fixed-outcome>
      </outcome>
    </method-call>
    <control-flow-rule id="__2">
      <from-activity-id id="__3">initMap</from-activity-id>
      <control-flow-case id="__5">
        <from-outcome id="__6">init</from-outcome>
        <to-activity-id id="__4">map</to-activity-id>
      </control-flow-case>
    </control-flow-rule>
    <use-page-fragments/>
</task-flow-definition>
</adfc-config>

Hi,
to call the bean, use the EL in Java and reference #{backingBeanScope.mapBean.initMap} as a method expression. If you try and access the bean directly then chances are that the instance is not available. Using EL from Java always guarantees this
Frank

Order of arguments while calling a Java method from C

Hi
are there any rules to order the transferred arguments ?
I wanted to transfer a native window event from C to Java and if the called
java method is declared like this: (int, long, int) (IJI)V
public static void nativeMouseButtonDownCallback(int wParam, long lParam, int which)
the value of 'which' is not correct (always the same independent from what I set it to in the C function)
If I declare the java method like this: (int, int, long) (IIJ)V
public static void nativeMouseButtonDownCallback(int which, int wParam, long lParam)
everything is fine.
Any information appreciated !
Bye Mark

Thanks for your reply !
Initially I also thought that the set of the value could be wrong and so
I used a printf statement in C to monitor the transferred value.
And still: the value I put in was different from what I got in java.
After this I put in simple numbers like 1,2,3 and in java I still got
the same wrong value.(guess max signed int 21474836..)
I really replaced the dll and class files and restarted the IDE.
The problem got solved by changing the order of the long an int.
Bye Mark

How can i call a main method from a different class???

Plzz help...
i have 2 classes.., T1 and T2.. Tt2 is a class with a main method....i want to call the main method in T2......fromT1..is it possibl..plz help

T2.main(args);

Is it possible to call a java method from servlet

Hi All,
I am trying to import a java class to my servlet and call a method of that class, is this possible. I am getting an error while importing the class.
I am using tomcat, have put my class files in th path
\WEB-INF\classes\com\kiran
My java goes like this
package com.kiran;
import java.sql.*;
import javax.sql.*;
public class DbCon
{ Connection con=null;
public Connection getCon()
-----return con;
catch(Exception e){ return con; }
and my aim is to call getCon() from my servlet. which is as follows
package com.kiran;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import com.kiran.DbCon;
public class check extends HttpServlet
DbCon db;
i am not able to compile my servlet, err is --> cannot find symbol DbCon..
How can i import the class, do i require any entries in web.xml ?
expecting your advice..
Thanks in advance
Best Regards,
Kiran

Ok, first off, if you are testing in tomcat (and as you said you are placing the class files in the path), you already compiled this classes, right? Otherwise I don't see how you placed your classes in /WEB-INF/classes/. Note that you will need two class files (based on your code. If not, then I'm missing part of the question. Typically, your IDE will help you with this problem a lot. The only thing that seems confusing is the catch (Exception e) statement which needs to be as part of a method (I assume this is a typo on your part).
If your problem is at runtime, don't forget to configure your web.xml to see your servlet.

Can we call super class method from Overwrite method using SUPER keyword

Hi All,
For one of our requirement , I need to overwrite "Process Event" method of a feeder class ,where process event is present is protected method. so when we are making a call , then its saying
"Method "process event" is unknown or Protected or PRIVATE ".
But we are just copied the source code in the "Process Event" method to the Overwrite method.
Can anyone provide me the clarification , why system behaving like this.
Thanks
Channa

Hi,
I think you can not.
Because, only public attributes can be inherited and they will remain public in the subclass.
for further detail check,
http://help.sap.com/saphelp_nw70/helpdata/en/1d/df5f57127111d3b9390000e8353423/content.htm
regards,
Anirban

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
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Can we call a java method from python

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