Questions tagged [java]

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

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2
votes
1answer
36 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
1answer
35 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
1answer
61 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: ...
1
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0answers
40 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
1answer
57 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
0answers
36 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 (...
0
votes
0answers
63 views

429 error when importing webpage

I am interested in checking which of my favorite groceries are on special at which supermarket before going to the shops (to know which items to buy from which supermarket) but every time I try to ...
4
votes
1answer
37 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 ...
1
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0answers
514 views

script to remove multiple Connection Linkedin

Unfortunately i have so many Connections About 20,000 in Linkedin, so i need to delete them all in multiple way, but Linkedin allow one by one. i searched there's a way in Internet, but all of them ...
0
votes
0answers
23 views

Approximating the density of an arbitrary set using an arbitrary Folner Sequence of its superset [duplicate]

How do we use Programming to approximate this limit where is the density of in , is the Folner Sequence of , is an interval with , and . For more information, click on this link (replace G,X,i,g ...
5
votes
1answer
56 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 ...
3
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1answer
307 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.
2
votes
1answer
79 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. ...
14
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1answer
331 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 ...
1
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0answers
101 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
1answer
123 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 ...
5
votes
1answer
95 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: ...
6
votes
1answer
269 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 ...
1
vote
0answers
186 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
2answers
141 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 ...
0
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0answers
140 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 ...
2
votes
0answers
123 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: ...
0
votes
1answer
31 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 ...
1
vote
1answer
186 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 ...
3
votes
1answer
226 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
1answer
70 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 ...
7
votes
1answer
164 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 ...
3
votes
0answers
60 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. ...
2
votes
1answer
144 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 ...
2
votes
0answers
601 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
1answer
188 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
0answers
49 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
0answers
51 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 ...
0
votes
2answers
155 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
0answers
84 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 ...
7
votes
1answer
563 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 ...
2
votes
1answer
77 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?
17
votes
3answers
1k 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 ...
5
votes
1answer
175 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
0answers
104 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 ...
3
votes
1answer
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
1answer
157 views

How to stop running Java?

<< JLink`; InstallJava[]; Clear[serverSocket, socket]; serverSocket = JavaNew["java.net.ServerSocket", 12345]; socket = serverSocket@accept[]; If I enter ...
3
votes
0answers
47 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 ...
0
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0answers
83 views

Popup window shows after kernel closed when using J/Link

A popup window always show after kernelLink.close(); And this only happen after expression evaluated as graph. Such as ...
3
votes
1answer
305 views

How could get all escape characters in Mathematica?

I am evaluating expression by using KernelLink. But the kernel will be suspended endless when meets a invalid escape character. ...
11
votes
0answers
862 views

How to bundle JLink with Java application using apache maven

The context: I am planning to visualize some results from my MMA code using D3.js. So I wanted to make a simple REST api using the light weight SparkJava framework. Given my fairly nonexistent ...
1
vote
0answers
46 views

MathCanvas.setMathCommand behaving badly and I have no Idea how to debug

For my first attempt to call Mathematica from Java, I got the GraphicsApp sample program working, then defined a package with a function called "metric" and made sure that that package works when ...
3
votes
0answers
74 views

Java anonymous functions from JLink?

JLink is really great to act on Java objects and access Java static methods. I'm asking myself if there would be a way to have access to a more recent Java syntax that allows anonymous functions, ...
10
votes
1answer
278 views

Converting text from unsupported encodings like 866 into known by Mathematica?

The list of character encodings currently supported by Mathematica is still extremely limited. For example, it supports only three standard IBM PC (OEM) code pages: ...