Questions tagged [java]

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

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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
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0answers
76 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 ...
2
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1answer
60 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[] ...
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1answer
56 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 ...
2
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1answer
101 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, ...
10
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2answers
545 views

Add new JDBC Driver to connect Mathematica to SQL database

I cannot open a SQLConnection to a SQL vectorwise database and I assume the JDBC driver is the problem. A JAR file was provided to me - the only info additionally provided to me was the java class: ...
2
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0answers
64 views

Update Matrix entry from Java

I found the following example online (which works fine) for sending commands from Java: ...
2
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1answer
54 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
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1answer
41 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: ...
10
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4answers
3k views

Failed to connect remote Mathematica kernel using J/Link

I'm trying to connect to a remote Mathematica 8 kernel (on a Windows machine) using J/Link. On the client machine, I put the JLinkNativeLibrary.dll file in ...
2
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1answer
98 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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1answer
61 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 ...
18
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3answers
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 ...
2
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0answers
50 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 (...
5
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1answer
50 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 ...
3
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1answer
117 views
5
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1answer
64 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
509 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
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1answer
87 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. ...
15
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1answer
381 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 ...
4
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2answers
156 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
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0answers
109 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
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1answer
129 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
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1answer
103 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
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1answer
344 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
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2answers
177 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 ...
1
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0answers
283 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 ...
0
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0answers
208 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
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0answers
136 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: ...
3
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1answer
235 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?
1
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1answer
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 ...
1
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1answer
195 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 ...
2
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0answers
202 views

Mathematica GUIKit [duplicate]

Does anyone of you know if the GUIKit package is still under some development by Wolfram Research or is the current version 1.1.0 the last one. Does it make sense to make GUIs using this package in ...
11
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7answers
2k views

Installing RLink on Linux

I'm trying to install RLink here. Needs["RLink`"] InstallR[] After downloading it throws an error: ...
7
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2answers
1k views

How can I integrate Open-CV with Mathematica?

I would like to run Open-CV functions from within Mathematica, can anyone figure out how to do this?
3
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1answer
78 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
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1answer
185 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
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0answers
66 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
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1answer
162 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
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0answers
688 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[..] *) ...
13
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3answers
8k views

Connect to SQLite database

I am trying to connect to a SQLite database and since there is no officially supported driver; I decided to use the sqlite-jdbc driver and port the respective code into Mathematica. However, the ...
11
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1answer
728 views

How to set up LinkSnooper for monitoring FrontEnd--Kernel communication?

What is the simplest way to set up LinkSnooper to monitor the communication between the Kernel and the Front End? I am looking for an answer that works on all platforms, including 32-bit Windows.
4
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1answer
194 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
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0answers
50 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 ...
2
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2answers
1k views

How to get a audio file's duration time in Mathematica?

I have a *.avi file and if I want to know the file's duration time: I can use this code to get the result: Import["test.avi", "Duration"] or the code to get the ...
1
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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 ...
9
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1answer
2k views

How can I connect to the IB TWS platform from Mathematica?

TWS is the trading platform of Interactive Brokers. Accessing it programmatically could be useful for various purposes. How could I access it from Mathematica ?
11
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3answers
3k views

Dynamic graph visualisation using JLink/Java and GraphStream

Visualising the addition of new nodes and edges to a graph to 'watch it grow' is to something Mathematica is not suited to by default. However this type of animation really helps convey the emergence ...
5
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2answers
429 views

J/Link: How to run a thread inside Mathematica

In the J/Link User Guide there is no example on how to use java.lang.Thread, from inside Mathematica. I'd like to know if is possible to start a thread from a ...
3
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0answers
216 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 ...