Calling net from java

Best and simple way to call .net assemblies in java

Exists a way to call .net assemblies more specific .dll files in java? I i’m developing a a framework for .net now i need to migrate it to java, i can do this? I using c# in .net.

3 Answers 3

Easiest way should be to COM-enable the .Net assembly. This way you can invoke any method the way you would communicate with normal WIN32 DLL’s.

Came across this interesting site (may not be directly helpful to you).

There is no need for COM objects and I would not recommend any custom solutions as it would be like reinventing the wheel. There are a lot of specific cases and details about such integration that would come up like passing by «ref», «out», generic methods etc.etc. the best I would suggest is to use JAVA to .NET bridge like www.javonet.com.

There are also other such bridges but with javonet you get very easy API that with one JAR file you can just copy your .NET dll and call it directly without any additional steps. It supports .NET exceptions, object disposing, calling instance and static methods including generics, setting/getting fields and lot more. You work with .NET dll objects in java like they were native JAVA class.

//Sample Usage of .NET Random Class from JAVA using Javonet NObject dotNetRandom = Javonet.New("System.Random"); Integer randomNumber = dotNetRandom.invoke("Next",5,10); 

Please notice that such bridge automatically translates results to native JAVA types if possible and the same way with methods arguments. A lot of samples you can read in quick start guide on Javonet website.

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Calling .NET code from Java: A Guide

How can I efficiently call .NET web services from Java? Synchronous calls are too slow. I attempted to create a Java application using C source code from http://phtranslator.sourceforge.net/. I was able to replace a specific string in the code and achieve success, but the output was not properly stored. To avoid string overflow, the method accepts a return buffer and its capacity (nlen) to ensure no more than nlen characters are stored in it.

How can I call .NET code from Java?

I’m seeking an alternative solution that is not the typical answer such as Web-services. Specifically, I’m interested in a lightweight option that can be executed on the same machine.

I’m searching for a Java method to invoke .NET methods.

As the creator of jni4net, I have developed an open source interprocess bridge that connects the JVM and CLR without requiring any C/C++ code. It’s built using JNI and PInvoke, and I hope that it proves useful to you.

Java has the potential to communicate with COM, while .NET can reveal COM interfaces. This means that a feasible and lightweight solution, which doesn’t rely on any third-party tools, could be attained. Another viable option is to utilize sockets to facilitate communication between the programs, which doesn’t necessitate a bulky instance of IIS to be established on the device.

Have you explored the use of Java Native Interface?

Previously, I created a C library that can be accessed through multiple technologies such as Java, .NET, COM, NSIS scripting language, among others.

The JNI is suitable for exposing a limited number of methods, but it may become cumbersome if you intend to expose the complete .NET framework due to the extensive number of header files and wrapper methods you would have to generate.

C# — Call Java Method from API in .NET, 3 Answers. Sorted by: 9. Here you go 🙂 I’ve used it myself and was very please with the implementation. IKVM: Using Java API’s in .NET Applications. (1) If you just want some libraries from Java. (2.1) If you have access to the code. (2.2) Last resort, dynamically load the Java into .Net (interpreter) Share.

How to call .net webservice from Java [duplicate]

I have developed a Java application and now I need to invoke a .NET web service within it.

Despite encountering several instances, I am yet to come across an ideal resolution.

Universal and language-independent web services can be accessed from anywhere, and upon invocation, they provide a response. Java-based web services consumption may be referred to in this context.

Explore the interoperability between Java and .NET by utilizing Microsoft.com’s web service, as suggested on MSDN.

Enabling Interoperability between classic ASP Clients and .NET Web Services with Java through integration.

The process is straightforward provided you steer clear of any unfamiliar jaxws/WCF interop issues related issues.

Depending on the type of .Net Webservice you are dealing with (WCF / SOAP / RESTful JSON / XML-RPC / etc.), there are various methods you can use to interact with it. Interacting with it from Java can be as simple as using HttpClient along with Gson/Castor, or it may require more effort such as configuring WSIT.

C# — How to call into .NET dll from Java, With one-jar file you can load this dll and call as follows: Javonet.AddReference(«your-lib.dll»); int result = Javonet.getType(«ReturnINT»).Invoke(«RetornaInteiro»); Javonet will automatically load your library in .NET process and give you access to any classes and types …

Calling .NET Web Services Asynchronically from Java

To avoid slow synchronous calls, I need to make asynchronous calls to .NET web services from Java. In .NET, the stub class created by wsdl.exe generates methods for asynchronous calls, such as BeginMethod() and EndMethod(). Although I created service stub using eclipse ganymede, it did not generate any asynchronous method calls. Can you suggest how to achieve this in Java? Thank you in advance.

Assuming that you are utilizing Eclipse for generating the Web Services client, it is likely that you are also using Axis2. With Axis2, you can create an asynchronous client by following the instructions provided here. Simply select the «Generate async» or «Generate both sync and async» option. Although the article is aimed at asynchronous web service s using Axis2, it primarily focuses on the service and not the client. However, the client code process is not significantly different.

Every asynchronous operation in Java Web Service is easily configured using the generator.

Check this out. It should help.

An end-to-end scenario for a client of a JAX-WS web service with asynchronous communication.

Is it possible to invoke the webservice method using a separate thread and have a callback included?

Rest — RESTful call in Java, If you are calling a RESTful service from a Service Provider (e.g Facebook, Twitter), you can do it with any flavour of your choice: If you don’t want to use external libraries, you can use java.net.HttpURLConnection or javax.net.ssl.HttpsURLConnection (for SSL), but that is call encapsulated in a …

Unable to call .net method From java using jna?

In an attempt to create a Java application from C code, I utilized the source code found at http://phtranslator.sourceforge.net/. To achieve this, I implemented specific steps to properly invoke the code.

public class Main < /** Creates a new instance of Main */ public Main() < >public interface simpleDLL extends Library < simpleDLL INSTANCE = (simpleDLL) Native.loadLibrary( (Platform.isWindows() ? "C:\\translator\\PhTranslateLib.dll" : "simpleDLLLinuxPort"), simpleDLL.class); public IntByReference GetTeluguTranslator(); public int Translate(IntByReference Translator, String szInput, StringBuilder szOutput, int nLen); public int GetTranslatedBufferLength(IntByReference Translator, String szInput, Pointer out); public void GetTranslatedBuffer(String szOutput, Pointer ppHint); >public static void main(String args[])

I am getting Following `Exception` Exception in thread "main" java.lang.IllegalArgumentException: Unsupported argument type java.lang.StringBuilder at parameter 2 of function Translate at com.sun.jna.Function.convertArgument(Function.java:552) at com.sun.jna.Function.invoke(Function.java:258) at com.sun.jna.Library$Handler.invoke(Library.java:216) at $Proxy0.Translate(Unknown Source) at anil.test.Main.main(Main.java:71) 

I achieved success in replacing String builder with a string, but the output was not saved in string .

The Translate technique takes in both the return buffer and its capacity (nlen), limiting the storage of characters in the buffer to no more than nlen to safeguard against string overflow.

Therefore, based on your situation, your objective is to guarantee.

1. Prior to the invocation of Translate , sufficient memory is assigned to a string buffer.
2. In the call, you provide the appropriate buffer size to ensure that it is populated only up to that length.

An instance of this would be that, in accordance with your code, you ought to be engaging in a particular action.

 // fill no more than 19 chars (+1 char for \0) in b int j= sdll.Translate( y , "ananathapura", b, 20); 

To ensure that b can accommodate 20 wide-characters, it’s recommended to use this as a rough estimate. It’s important to note that Java may have a method for pre-allocating string space. It’s worth noting that if you specified 0 for nLen in your code, no data was stored.

In the production phase, it is recommended to allocate a string with enough capacity to accommodate all the converted unicode characters, instead of specifying a fixed size like 20.

Determining the size of the converted string can be tricky since a direct one-to-one conversion between English characters to Telugu or Hindi characters is not possible.

At this point, the involvement of GetTranslatedBufferLength and its associated procedures becomes significant.

Please consult the documentation and the comments provided in the code for more information about the particular concept being discussed.

Calling java web service by .net web service, You’re simply going to make your .NET service be a client to your Java service: Right-click your web service project and use «Add Service Reference». Specify the URL to the WSDL of the Java web service in the «Address» box, then click «Go». Specify a «Namaespace» through which the Java service …

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Calling .NET Web Service (WSE 2/3, WS-Security) from Java

I need to call a web service written in .NET from Java. The web service implements the WS-Security stack (either WSE 2 or WSE 3, it’s not clear from the information I have). The information that I received from the service provider included WSDL, a policyCache.config file, some sample C# code, and a sample application that can successfully call the service. This isn’t as useful as it sounds because it’s not clear how I’m supposed to use this information to write a Java client. If the web service request isn’t signed according to the policy then it is rejected by the service. I’m trying to use Apache Axis2 and I can’t find any instructions on how I’m supposed to use the policyCahce.config file and the WSDL to generate a client. There are several examples that I have found on the Web but in all cases the authors of the examples had control of both the service and the client and so were able to make tweaks on both sides in order to get it to work. I’m not in that position. Has anyone done this successfully?

5 Answers 5

WS-Security specifications are not typically contained in a WSDL (never in a WSE WSDL). So wsdl2java does not know that WS-Security is even required for this service. The fact that security constraints are not present in a WSE WSDL is a big disappointment to me (WCF will include WS-Trust information in a WSDL).

On the client end, you’ll need to use Rampart to add the necessary WS-Security headers to your outgoing client message. Since the WSDL does not report what WS-Security settings are necessary, you’re best off by asking the service provider what is required. WS-Security requirements may be simple plaintext password, or might be X509 certificates, or might be encrypted message. Rampart should be able to handle most of these scenarios.

Apache Rampart is «turned on» by engaging the module in your axis2.xml file. You’ll need to download the Rampart module and put it in a specific place in your axis2 directory, then modify the xml file. You can also engage Rampart programatically (please edit your original question if this is a requirement and I’ll edit this response).

Depending on how you configure rampart (through other XML files or programatically), it will intercept any outgoing messages and add the necessary WS-Security information to it. I’ve personally used axis2 with rampart to call a WSE3 service that is secured with UsernameToken in plaintext and it worked great. Similar, but more advanced scenarios should also work. There are more details on how to set up and get started with Rampart on the site linked above. If you have problems about the specifics of Rampart or how to use Rampart with your particular WSE setup, then edit your question and I’ll try my best to answer.

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