Java and DLL's

How can I call a DLL and invoke it's methods from a java class? The DLL was written in Visual Fox Pro and it's class definition is OLEPUBLIC so it should be accessible to any automation client.

I am not sure I understand the native code part. Can
you explain in more detail, give me an example, or
point me to an example or tutorial?To start with you need the following.
A C or C++ compiler.
A basic understanding of the C/C++ language.
Knowledge on how to create shared libraries (dll) with the compiler.
You can't do JNI if you don't know the above.
Learning the above has nothing to do with java.
If you search in the JNI forum then there are libraries (java) that help you use dlls without using JNI yourself. Those might or might not help you.

Similar Messages

How to package/inlcude C++ .exe and .dll files in a Java Web Start App?

Hello,
I have a Java Web Start application that runs fine if the application is only 1 .jar file.
But I have a need to also run C++ .exe and .dll file from my Java application.
I wonder if someone could please tell me how to package/include C++ .exe and
.dll files in my Java web start application?
Thank you and Best Regards,
Akino

You need to place the EXE and DLLs inside the jar.
Java cannot execute them from the jar. They have to be extracted (see Class.getResourceAsStream) from the jar and copyied into the target machine file system, perahps to the temp directory. Now you can execute them using Runtime.exec() or ProcessBuilder.start().
Edited by: baftos on Jan 14, 2011 6:49 PM

Access jar's and dll's whithin a single jar file???

Hello everybody!
I am building an application which is dependent on external jar and dll files. I would like to put these external files in my project jar, and in runtime I want to set the path to these files located in my project jar. Is this possible? I have tried this:
structure in my project jar:
-myApp.jar
+META-INF
-myApp
-Main.class
external.jar
external.dll
and in my manifest file:
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.2
Created-By: 1.4.2_01-b06 (Sun Microsystems Inc.)
Main-Class: myApp.Main
Class-Path: /external.jarWhen I try to run my application jar with:
java -jar myApp.jarI get "java.lang.NoClassDefFoundError" .....
i.e. the WM does not find my external jar.
My question now: Is it possible to do things this way? That is to put dependent jars and dlls INSIDE the "running" jar????
Hope someone can help me...
Best regards
TM

You cannot put a JAR inside a JAR - Java won't be able to find the files in the packaged JAR.
What you could do is unpack the myApp.jar and external.jar and include the directory structure inside your own project.jar.
It will not work with a DLL inside the JAR. There's no way around it - the DLL must be a file in the file system, otherwise Windows will not be able to load it (Windows doesn't know what JAR files are, and it can't load a DLL that's inside a JAR file).

Java and C ??

Hi.
Can anybody tell me if its possible for a java file to communicate with an executable c file ?
for example, if the executing c file is waiting for any key to be pressed e.g.( "getch( ) ;" ) to continue, can a java program supply this keypress ??
Can anyone suggest a fix ?
thanks
pmac.

I believe that, since you have an executable (.EXE) file, that JNI is not what you want. JNI is for communication between Java programs and DLL's, and is typically used to integrate code that cannot be written in Java (platform specifics) or for better performance.
Look at java.lang.Runtime.exec() - it can be used to invoke a native process. It returns a java.lang.Process, which has methods to interact with the Input and OutputStreams of that process.

Error when accessing Java and JVM section

I'm getting the following error when accessing the Java and
JVM section of the CF Administrator:
"Element JDKPATH is undefined in FORM"
I've searched a lot and there's very little on the topic. On
this forum there are two posts and one got no answer, on the other
it was suggested it might be the jvm.config file. I've looked at
mine but I really have no idea what could be wrong. Also, there are
two jvm.config files in my install, one in jrun4/bin and another in
jrun4/servers/cfusion/cfusion-ear/cfusion-war/WEB-INF/cfusion/runtime/bin
folder (I did multiserver installation).
I've already tried a bunch of things and no luck, any help is
appreciated on this.

quote:
Originally posted by:
ke4pym
What is your path? Make sure you're using forward slashes.
ie: d:/java/jdk1.6.0_12/bin/blah/blah/blah
What path are your referring to? My actual PATH environment
variable? Or are you referring to something else. Btw, here's what
my config file looks like right now.
# VM configuration
# Where to find JVM, if {java.home}/jre exists then that JVM
is used
# if not then it must be the path to the JRE itself
java.home=C:/JRun4/jre
# If no java.home is specified a VM is located by looking in
these places in this
# order:
# 1) bin directory for java.dll (windows) or
lib/<ARCH>/libjava.so (unix)
# 2) ../jre
# 3) registry (windows only)
# 4) JAVA_HOME env var plus jre (ie $JAVA_HOME/jre)
# Arguments to VM
java.args=-server -Xmx512m -Dsun.io.useCanonCaches=false
-XX:MaxPermSize=192m -XX:+UseParallelGC
-Dcoldfusion.rootDir={application.home}/
# commas will be converted to platform specific separator and
the result will be passed
# as -Djava.ext.dirs= to the VM
java.ext.dirs={jre.home}/lib/ext
# where to find shared libraries
java.library.path={application.home}/servers/cfusion/cfusion-ear/cfusion-war/WEB-INF/cfusi on/lib,{application.home}/servers/cfusion/cfusion-ear/cfusion-war/WEB-INF/cfusion/jintegra /bin,{application.home}/servers/cfusion/cfusion-ear/cfusion-war/WEB-INF/cfusion/jintegra/b in/international
system.path.first=false
# set the current working directory - useful for Windows to
control
# the default search path used when loading DLLs since it
comes
# before system directory, windows directory and PATH
java.user.dir={application.home}/../lib
# JVM classpath
java.class.path={application.home}/servers/lib,{application.home}/lib

Java and IPv6

I'm trying to use ipv6 with J2SE 1.4.1 on my windows 2000 ipv6 preview.
When i try to open an socket server I get the message "Protocol family not supported" :
InetAddress inet = InetAddress.getByName("fec0::260:8ff:fe52:f9d8");
ServerSocket server = new ServerSocket (13267,0,inet);
This code work well with ipv4 address.
What's wrong ?
Does J2SE IPv6 work fine with windows 2000 ipv6 preview stack ?
where can i find ipv6 java programming socket example ?
Thank
Patrick

Patrick.
I have the same problem on Windows 2K.
I did install the Microsoft Technology
preview, and have an Ipv6Client.java
and IPv6Server.java that works fine
on RedHat Linux.
But I get the same error as you.
I found a non-sun patch on the web
that modifies the Socket Class and
several other classes and adds another
.dll file to the jvm. It appears to be
a wicked hack, but it might work. I am
going to give it a try. I might call Sun
to get the IPv6 support on Windows2K. You
can always write your own class to handle
IPv6 Addresses.

ABAP , JAVA And XSLT Mapping Doc's

Hi,
I am new to SAP XI Any body please send me the Doc's Related to ABAP, JAVA And XSLT Mappings. Thanks in Advance.
Regards
Kiran.B

Hi
Refer to
ABAP mapping:
How to Use ABAP Mapping in XI 3.0
JAVA mapping:
http://help.sap.com/saphelp_nw04/helpdata/en/bd/c91241c738f423e10000000a155106/frameset.htm (Java mapping)
XSLT mapping:
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/01a57f0b-0501-0010-3ca9-d2ea3bb983c1
/people/prasadbabu.nemalikanti3/blog/2006/03/30/xpath-functions-in-xslt-mapping
/people/sreekanth.babu2/blog/2005/01/05/design-time-value-mappings-in-xslt
/people/anish.abraham2/blog/2005/12/22/file-to-multiple-idocs-xslt-mapping
XSLT Mapping with java enhancement
/people/pooja.pandey/blog/2005/06/27/xslt-mapping-with-java-enhancement-for-beginners
XSLT - /people/dirk.roeckmann/blog/2006/07/26/grouping-xml-with-xslt--from-muenchian-method-to-xslt-20
Regards,
Kumar.
Reward points if helpful!!

BI Java and BI ABAP -RSPLAN issue

Hi All
We are working with BI system ,using BI 7.0 Java and BI ABAP as separate systems on same host.
Already run the template intaller for BI Java and ABAP integration.
But facing some issue ,when going ot BI ABAP and RSPLAN and clicking the Start Mideller
it is opening a browser as http://host:8000/sap/public/myssocntl?sap-client-XXX
Since this is not correct and it should open BI Java portal instead of ABAP stack page.
Instead this should open a Url like this http://host:5XX00/webdynpro/dispatcher/sap.com/biplanworkbench1/Modeler?
I check on BI ABAP system under SAP Reference IMG -> SAP Customizing Implementation Guide-> SAP NetWeaver _> Business Intelligence-> BI Integrated Planning -> Settings for Starting the Planning Modeler.
There the default Url is BEx Portal Server and the url is
http://host:5XX00/webdynpro/dispatcher/sap.com/biplanworkbench1/Modeler
Can anybody let me know why this is going to ABAP server instead it should go to Java.
Regards
Ajay
Edited by: Ajay Sandal on Mar 10, 2009 2:31 PM

Hi Ajay ..
Good news that ur issue is resolved ..
I have somewhat similar issue .. Hopu u can put some light ..
I have Bi 7.o with Add on java ,
In RSPLAN from ABAP system , modular page is not coming . if i click on start moduler button in RSPLAN ..portal page is coming up and i have to give logging details .
Please suggest .
Thanks

How to get return value from java and read by other application?

i want to read return value from java and the other application read it.
for example:
public class test_return {
    test_return(){
    public int check(){
        return 1;
    public static void main(String args[]){
       new test_return().check();
}from that class i make as jar file. How to read the return value (1) by other application?
thx..

If your installer is requiring some process it invokes to return a particular value on failure, then the installer is seriously broken. There are a bazillion commands your installer could invoke, and any of them could fail, which in turn could invalidate the entire install process, and any of them could return any value on failure. The only value that's consistent (in my experience) is that zero means success and non-zero means failure, with specific non-zero values being different in different programs.
About the only control you have over the JVM's exit code is that if your main method completes without throwing an exception, the JVM will have an exit code of 0, and if main throws an exception (either explicitly or by not catching one thrown from below), it will be non-zero. I'm not even sure if that's guaranteed, but I would guess that's the case.
EDIT: I'm kind of full of crap here. If you're writing the Java code, you can call System.exit(whatever). But nonetheless, if your installer requires certain exit codes from any app--java or otherwise--you have a problem.
Edited by: jverd on Oct 29, 2009 1:27 AM

Problem with java and flex web service

Hi,
I have a basic web service written in java using jax ws 2.1
ri. I need to call it from Flex using the WebService class
Annotations for the java web method :
@WebMethod
public void Login(
@WebParam(name="server") String serverURL,
@WebParam(name=AUTHENTICATE_HEADER,header=true,mode=WebParam.Mode.INOUTHolder<Authenticate Header>
authHeader)
When I try and call the service from Flex , it can't find the
login method and attempts to call it fail. If I set the web service
to RPC based using @SOAPBinding , the method is found but then
there are issues with the authentication header.
What do I need to do to get flex web services communicating
succesfully with java ?
Are there are any known compatibility issues ? Or guidelines
for going about this ?
Any help would be appreciated

well Shay,
i've used JDev's tools to developer and to deploy the web service: the war and ear files are automatically generates you to the end of the process.
I have included all the files java and the compiled classes, but I do not have files jar.
But don't works: if i create only one java class with all code inside then it works fine!!
Daniele

Problem with java and javaw

Hi,
In running the following simple code, I have gotten different results using java and javaw.
public class Test {
public Test() {
public static void main(String[] args) {
int x =4;
System.out.println("The value is "+ ((x > 5)?6.0:4));
System.out.println("The value is "+ ((false)?6.0:4));
System.out.println("The value is "+ ((true)?99:9.9));
Using java, I get the following results:
The value is 4.0
The value is 4.0
The value is 99.0
But using javaw, I get the following results:
The value is 4.0
The value is 4
The value is 99
Any ideas why this is so?
Thanks for any help.
Gilbert

I used JBuilder to run the following code and Jbuilder uses javaw.
By the way, the correct answer is the one using java right?

Problem with Java and Zip Files

Hello there everyone. I have a problem with trying to zip up directories with empty folders in them. They zip fine with my code, but according to winzip, the number of files in the archive is incorrect. It's supposed to have a total of 288 files in it, but when it's zipped up, it only says 284. I mention specifically the "empty directories" note because the zipping works fine without empty folders.
Below is the code for the zip method:
public static void zip(File[] list, File zipfile, File zipRoot)
     throws IOException {
      if (!zipfile.exists()) {
               zipfile.createNewFile();
          else if (!zipfile.isFile()) {
               throw new IOException("The zip file, " + zipfile.getAbsolutePath()
                         + " is not a file.");
          if (list.length == 0) {
              LOG.error("The list of files to zip up is empty.");
          for (int i = 0; i < list.length; i++) {
               if (!list.exists()) {
                    throw new IOException("The file or directory, " + list[i].getAbsolutePath()
                              + " does not exist.");
          FileOutputStream fos = new FileOutputStream(zipfile);
          ZipOutputStream zos = new ZipOutputStream(fos);
          for (int i = 0; i < list.length; i++) {
               if (LOG.isDebugEnabled())
                    LOG.debug(i + ": " + list[i].getName());
               String entryName = getRelativeName(list[i], zipRoot);
               if (list[i].isDirectory()){
                    if (list[i].listFiles().length == 0){
                         ZipEntry entry = new ZipEntry(entryName + "/");
                         zos.putNextEntry(entry);
               else {
                    ZipEntry ze = new ZipEntry(entryName);
                    zos.putNextEntry(ze);
                    byte[] buffer = new byte[8096];
                    FileInputStream fis = new FileInputStream(list[i]);
                    int read = 0;
                    read = fis.read(buffer);
                    if (LOG.isDebugEnabled())
                    LOG.debug("\tFound " + read + " bytes.");
                    if (read == -1){
                         //empty file, but add it for preservation.
                         //zos.write(buffer,0,0);
                    while (read != -1) {
                         zos.write(buffer, 0, read);
                         read = fis.read(buffer);
                    fis.close();
                    zos.closeEntry();
          zos.close();
The files look like they're there, but I need the system to be able to determine the number correctly.
Here's the interesting thing: It zips the files, and then when I use the size() method for zip files in java, it says 284 files. But when I unzip, it says 288 again. It's like there's files missing when compressed, but when decompressed, they return. Note that the files are actually there. If I open the archive in a third party app such as Winzip AND Winrar AND IZarc, they all show 288 files. Any idea what would make the number of files appear incorrectly in a zip file when zipped by java with the code above? Thanks in advance.
- Chris

I figured out the problem. When zipping files in windows using winzip, it doesn't explicitly count folders as a "file/folder" as a file in itself. It will create the folders for files to go in, but the folder itself will not be 'counted' when you query the info of the file itself. You have more control of the zip file in java, and can count the folder as a file or not.

Problem with java and pogo games

i use mozilla and now with the problems with java and hackers cannot play my pogo games,what can i do? i disabled my java i tried java 6 doesnt work or is not safe,what is a safe way to play games on pogo that use java?

Oracle has released a Java 7 Update 11 to address security vulnerabilities and you should update to that version.
*https://support.mozilla.org/kb/how-to-use-java-if-its-been-blocked
See also:
*http://kb.mozillazine.org/Java#Windows_installation_issues
You can find the latest Java version on the Oracle website.
See Java Platform > Java SE 7U11 and Java 6U38 (Download JRE)
*http://www.oracle.com/technetwork/java/javase/downloads/index.html

Compability problem with Java and Python RSA algorithm implementation

I have client server application. Server is writtein in python, client in java. Client receives messages from server encrypted with RSA (http://stuvel.eu/rsa), and I'm unable to decrypt it. It seems that this is RSA algorithm compatibility problem. I'm using algorithm from java.security package, instatinating Cipher object like this: c = Cipher.getInstance("RSA"); . I noticed that this algorithm produces for input blocks of lengtrh <=117 ouput block of length 128. Server I guess uses the most triviall impelentation of RSA ( (1 byte is encrypted to 1 byte) So i want to make my java algorithm compatibile with this one which server uses. How to do that ? Do i have to instatinate Cipher object in different way ? Or use another library ?

azedor wrote:
First you said it was no good because it could only handle <= 117 byte inputs, now you say it is no good because it produces a 128-byte output. You're not making sense.First i said that this two RSA implementations are not compatibile, and first reason i noticed firstly is that Python imlementation for input of length N produces cryptogram of the same length. Not true. In general, the RSA encryption of any number of bytes less than the length of the modulus will produce a result of length near that of the modulus. When N is less than the length of the modulus, it is rare that N bytes of cleartext produces N bytes of ciphertext.
Java implementation for data block of length <=117 produces alwasy 128 bytes of output.Pretty much correct and very much desirable. This is primarily a function of the PKCS1 padding which is used to solve two basic problems. First, as I alluded to in my first response, it is the nature of the algorithm that leading zeros are not preserved and second when the cleartext is very small (a few bytes) the exponentiation does not roll over and it is easy to decrypt the result. Both these problems are addressed by PKCS1 padding.
>
>
After what sabre150 said i think of giving up idea of translating Python code to Java and considering to use another assymetric cryptography algorithms on both sides. Can you recommend me sth what should be compatibile with Python ?This seems to be at odds with your statement in reply #3 "Also have acces only to client code so i have to change sth in java." ! This statement is why I said "I suspect ... you have dug a deep hole".
In your position I would use the Python bindings for openssl. Once more, Google is your friend.

Events problem with (Java and ActiveX)

Hi,
I use an ActiveX component with Java and i've got a problem with events.
Java classes were generated with Bridge2Java (IBM).
In order to manage events I added a listener in my application :
javaMyActiveX = new MyActiveX();
javaMyActiveX.add_DMyActiveXEventsListener(new _DMyActiveXEventsAdapter());
I also added a constructor in the _DMyActiveXEventsAdapter class and I fill the body of methods.
The ActiveX generates two types of events :
- The ones are directly generated by methods.
- The others are generated by a thread.
With MS Products (VB, Visual C++, Visual J++), I catch all events.
With java (jdk 1.4), I catch only events generated by methods.
Can anyone help me.

I'm not 100% sure, but the last time I used that bridge, it only worked if you ran your Java app within a Microsoft VM.

Java and DLL's

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