Questions tagged [java]

Questions about interfacing Mathematica and Java, particularly using J/Link.

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6 votes
2 answers
173 views

How to convert a Java BufferedImage to a Mathematica Image?

Mathematica's CurrentScreenImage is very buggy on multiple monitor setups, so Wolfram tech support has proposed to use .NET or Java frameworks to implement my own. ...
  • 2,309
1 vote
0 answers
54 views

Execute wolfram command from java & j/link along with set of variables [closed]

I have been trying to execute some expression/formula which may have multiple variable, and I want to set values(like how we do on kernel command tool). We are using J/Link to connect kernel from java....
  • 11
4 votes
1 answer
94 views

Change DataStructure (or maybe just a symbol) from JLink/Java program

I try to use JLink and Java program for receiving responses from the abstract WebSocket server. WSS not supported by Wolfram Language now, but I can use this java project + JLink for the creating a ...
0 votes
0 answers
30 views

How do I call command-line tools from a standalone java library using WL?

I have the following command which when I run on the windows command line, works perfectly fine. ...
  • 8,417
0 votes
0 answers
56 views

How to extract the images from a wolfram list to an array/list of byte arrays using JLink in Java

I have the following code in Java, where I am trying to use the WolframAlpha command and get the result as a list of images (byte arrays) ...
6 votes
0 answers
102 views

How to Compile an Open-Source Java Project which depends on the Wolfram Engine for Developers?

Background: I have a license-related compile-cycle question. I developed a rather large Java project that partially uses the Wolfram Engine (for Developers) to perform certain computations. The ...
0 votes
1 answer
59 views

Is there a way to represent/call Java's or operator in Mathematica?

In Java, I can do Int char = '~' | 0x10000 Is there a way to call this Java code in Mathematica? I checked https://reference.wolfram.com/language/JLink/tutorial/CallingJavaFromTheWolframLanguage.html ...
  • 8,474
2 votes
1 answer
100 views

OpenSQLConnection fails - due to some Java problem?

After upgrading to 12.3, I can no longer connect to an MS SQL Server using OpenSQLConnection. Apparently due to some problem with Java(?). I tried to reinstall JRE 8, but no change. DatabaseExplorer[] ...
  • 477
2 votes
0 answers
71 views

Update Matrix entry from Java

I found the following example online (which works fine) for sending commands from Java: ...
  • 291
2 votes
1 answer
65 views

Building a Manipulate and an ArrayList with JLink

I'm wondering if it's possible to put this code inside a Manipulate. I tried just like this and got the results in the message box: Then when I selected a diferent word from the PopMenu I got this: ...
1 vote
1 answer
45 views

Incorrect number or type of arguments when using @contains[ ]

I tried to make the old code you suggested me a little faster by doing this changes: ...
2 votes
1 answer
160 views

Problems when importing a custom Java class

I have a jar file so I tried to run the class from Mathematica following these steps, but I get all these: ...
2 votes
1 answer
116 views

How can I connect Mathematica to an SAP/ERP server?

I am trying to get some references for accessing an SAP/ERP server from Mathematica. It has been suggested that possibly JLink or NetLink could be used. Assuming that I have the server address, ...
1 vote
1 answer
62 views

Having no result with Jlink function

I'm new at Jlink (and English, so I'm sorry if things aren't clear). I did a code which tries to scan a file searching for a given word. As a result, I'm supossed to get the line where the given word ...
2 votes
0 answers
85 views

J/Link with Environment Variables and Command-Line Parameters

I have inherited a large number of Java files with classes I am trying to call from Mathematica via J/Link. They are legacy and am not at liberty to modify. A few are used on command-line scripts (...
  • 31
5 votes
1 answer
54 views

Prevent JLink from using a DisabledPreferencesFactory with Java on Linux

This is kind-of a strange question, so please bear with me. We have a Java application that has a utility for Mathematica 12 that lets you run our app from Mathematica using JLink. This works fine ...
  • 153
3 votes
1 answer
129 views

A JAVA Program wants call Mathematica's Reduce function to solve equation and get the result

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5 votes
1 answer
68 views

Missing ticks and numbers on a plot when using JLink + Mathematica 11.3

I am facing a pretty random problem using JLink (Java) connected to a Mathematica 11.3 kernel and front-end. Basically I want to get an image using the JLink Java method ...
4 votes
1 answer
582 views

Is there any way that convert entire mathematica code to java or python?

I am novice to Mathematica. I want to convert Mathematica code from my textbook to Java or Python to trace coding.
  • 61
2 votes
1 answer
94 views

Convert a Java object to interface via J/Link

I'm trying to use a Java library called CDK with Mathematica's J/Link. ...
16 votes
1 answer
417 views

Using ImageJ filters directly from Mathematica through J/Link

tl;dr I am looking for a short but complete example that shows how to apply an ImageJ filter to a Mathematica Image through J/Link. Fiji/ImageJ is one of the ...
  • 228k
1 vote
0 answers
120 views

Lock cursor position to mouse

I would like to lock the cursor position, i.e. the insertion point, to the current position of the mouse at all times in a given notebook. An experiment with J/Link approximates this, by repeatedly ...
9 votes
1 answer
137 views

How to launch a separate Java VM on each sub-Kernel?

I have some code that process very large flat files in to separate HSQL(Standalone) databases using ParallelSubmit and JDBC for each file using the strategy in this post (19542). Lately I keep ...
  • 39.8k
5 votes
1 answer
108 views

Incorrect number or type of argument when using Jlink to call setAccessible

I am trying to use Java reflection to access stateVector from the following package: ...
7 votes
1 answer
392 views

Update Java used by Mathematica 10

I would like to update the Java version used by Mathmematica 10 from 1.7.x to 1.8.x/ Is it possible without installing Mathematica 11? I have the latest Java on my system, but Mathematica 10 uses an ...
  • 589
1 vote
0 answers
340 views

Is there a way to know how much Java heap space to set?

I have already set it to be 4GB. Needs["JLink`"] ReinstallJava[JVMArguments -> "-Xmx4096m"] However, when exporting a dataset to Excel sheet, I still get the ...
4 votes
2 answers
161 views

J/Link HMAC Base64

I am trying to recreate a Java algorithm in Mathematica. It is taking a key and signing a message using the HMAC and SHA256 algorithm. The Java code for which I am basing it off is here I have ...
  • 1,269
0 votes
0 answers
218 views

How to save Image or Graphics in Terminal? [duplicate]

In my Linux computer,it can't save Image or Graphics to picture format such as ...
  • 6,736
2 votes
0 answers
147 views

System.Out.println in JLink does not flush to

I am playing with JLink in Mathematica. I created a simple Java(Kotlin) Class HelloKT like this: ...
  • 121
1 vote
1 answer
34 views

Need J/Link values returned in 1D instead of 2D format (i.e., not exponents, fractions, on multiple lines)

The following code shows how default KernelLink values are sent back to Java in 2D text form. Which becomes a heap-big mess in an array of exponential values, since all the exponents are printed first ...
  • 167
1 vote
1 answer
197 views

Trying to run J/Link SampleProgram.java from Mac Terminal: Exception in thread "main"

Trying to run the [WSTP J/Link SampleProgram.java][1] Mathematica version 11.0.1.0 file from the MacOS Sierra version 10.12.6 Terminal, generates "Exception in thread "main" ... Updating to Oracle ...
  • 167
3 votes
1 answer
248 views

What does it mean that GUIkit is being deprecated?

What is the disadvantage of using GUIKit now? What does it mean that it is being deprecated? Will it be removed from Mathematica in some later versions?
3 votes
1 answer
83 views

Failed to load JLink in consecutive antcall's

I'm using Ant script in Eclipse using Workbench on Windows 7. I've used multiple versions but the issue persists. Essentially, I define multiple targets and call them in sequence like this: Multiple ...
  • 51
7 votes
1 answer
203 views

J/Link stealing focus from the Front End on OS X. Workaround?

Link to Wolfram Community version Calling getDefaultToolkit() through J/Link causes the Front End to lose focus. This is specific to OS X. Here is a minimal ...
  • 228k
3 votes
0 answers
72 views

How to temporarily turn off log messages?

I'm using GUIKit in Mathematica 11.0, which throws an error message whenever a window or panel is shown. I know GUIKit is deprecated but I don't want to port a whole project to the newer controls. ...
  • 163
2 votes
1 answer
171 views

How to get the image in the clipboard with a J/Link method?

The Paste will not give a return,just print the content of clipboard.It is hard to asign the result to a variable.I make a .NET method here to get the image in ...
  • 24.6k
2 votes
0 answers
719 views

How to lock a socket or create a queue for requests?

I try to implement sockets from java.net.ServerSocket in Mathematica. I execute this code step by step: Needs["JLink`"] InstallJava[] (* LinkObject[..] *) ...
4 votes
1 answer
196 views

When using Java objects through JLink, how can I multitask the objects?

I use Mathematica 11.0.1 on Windows 10 and have a Java class which acts as a 'facade' for a headless browser (PhantomJS). In Mathematica I instantiate the class through JLink as follows: ...
1 vote
0 answers
51 views

Instant detection of digital or analogue variation of a variable with Mathematica in Windows 8.1

I am using an assembly that contains two acquisition board (PCI-1742U-AE and PCIE-1816H-AE) and an external circuit, connected to boards. The computer uses Windows 8.1, and the communication is done ...
1 vote
0 answers
52 views

Creating an automatic code feedback for class

I'm trying to create a server application that accepts uploaded Mathematica files (that follow a certain API), then run a few tests on modules defined within those files. This is for a course where ...
1 vote
2 answers
195 views

Clearing the JavaClassPath at Runtime in JLink

I am trying to access a remote MongoDB database through Mathematica using JLink. The connection is fine, but my installation of Mathematica 10.0 seems to contain an SLF4J logger addon, which prints ...
3 votes
0 answers
260 views

Failure connecting JLink with Android Studio -Java application

I want to connect an android application with Mathematica, in order to make some computations and then return the results to the user. I have downloaded Mathmatika and run the Examples from JLink ...
  • 31
7 votes
1 answer
693 views

How to create keypress simulation program?

Main Problem I'm trying to create a widely applicable keypress simulation program, but I don't know how to use Java so I can only search for Q&As on the site, which is inefficient. So I want to ...
  • 9,218
2 votes
1 answer
81 views

What does the function StartJava do? [closed]

In Mathematica's autocomplete list, the function StartJava appeared. I searched the mathematica's reference site and found that the function was undocumented. What does it do?
  • 141
18 votes
4 answers
2k views

Implementing Local HTTP Server

How might I implement a local HTTP server using either Java, C#, C or purely Mathematica? It should be able to respond with Mathematica input to GET and POST requests ideally on W7. This is related ...
  • 7,489
5 votes
1 answer
182 views

Why can 10.3.1 import a 2MB excel file, but 10.4.0 cannot, with the same commands and file?

Here is the code: ...
3 votes
0 answers
112 views

What is the appropriate way to handle JVM memory issues in a Mathematica package?

I maintain a large Mathematica package (here) that, for certain operations, calls out to a Java library (here). The details of the libraries are not important, but I've come across a frustration with ...
  • 2,118
3 votes
1 answer
2k views

How to fix a "Java failed to load class" when using custom Java class using JLink?

I have a Java project compiled into a jar file with a class called HttpClientSSO. The commandline java -cp bota.jar org.nilostep.bota.HttpClientSSO executes ...
3 votes
1 answer
197 views

How to stop running Java?

<< JLink`; InstallJava[]; Clear[serverSocket, socket]; serverSocket = JavaNew["java.net.ServerSocket", 12345]; socket = serverSocket@accept[]; If I enter ...
  • 6,736
3 votes
0 answers
59 views

Can JLink return a structured object?

What I want to achieve seems obvious but I cannot figure it out: I need to find a way that when I send an expression to be evaluated from a Java back end to a Mathematica kernel, I can live with it ...