LD_PRELOAD variable in JNI code

My java code calls via JNI some C++ code from a shared library (eg libtest.so). The code is instrumented with some special debugging symbols that exist it libdebug.so. When I call LD_PRELOAD=/usr/lib/libdebug.so java com.test.myMain the execution stops with Exception in thread "main" java.lang.UnsatisfiedLinkError because symbols from lib...

Can I find out what variable java.library.path maps to on the current platform?

So far I've learned the following about the java.library.path property: It's used when loading native libraries, as opposed to java classes Its default value depends on the operating system: On windows, it maps to PATH On Linux, it maps to LD_LIBRARY_PATH On OS X, it maps to DYLD_LIBRARY_PATH (Please correct me if I've misunderstood any o...

Why can't my C code find my Java functions?

My application makes calls to a native library, and then within the native library, makes calls back to the Java code. I have the calls TO the native library working correctly ( I'm pretty sure ), but not its telling me that it can't find the Java functions when trying to call them from the C file. The application doesn't even crash, ther...

OpenGL 1.1 to OpenGL 3 wrapper

Hi. I came across TWL (Themable Widget Library, http://twl.l33tlabs.org/ ) when looking for a GUI library for Java + OpenGL (LWJGL). It looks pretty nice and there is an editor and all. The drawback is that is coded against OpenGL 1.1 spec and I'm using OpenGL 3.3 core. So I looked at the sources to see if I could code a wrapper to get TW...

Is there a performance impact for using code blocks in Java?

I'm starting to play with OpenGL from Java, and I'm encountering a situation where I need to put a lot of code between many glBegin() and glEnd() calls, and would like for the code to be be auto formatted such that it is easy to see at a glance which code belongs to which glBegin/glEnd. To accomplish this, I have been using an anonymous c...

Initialize a variable

Is it better to initialize a variable when the variable is declared, or only declare the variable and use the variable? What is the beter, what is more efficient? For example, I have this code: #include int main() int number = 0; printf("Enter with a number: "); scanf("%d", &number); if(number < 0) number= -number; printf("The modul...

is there a way to define flags in java and run code only if those flags are defined?

c\c++ can define: #ifndef <token> /* code */ #else /* code to include if the token is defined */ #endif my question, is there a way to do it in java? (which is not defining a global static variable..) for example i want to run some code only in debug mode.. thanks!...

how to get java class object values in jsp

I have a java class Main.java where I'm calculating the Sum and Difference in the variable like int sum = a+b; int diff = a-b; and are are the values which are coming from the database through Hibernate. now i want to Display the sum and diff values on a JSP. please Help me out to bring sum and diff values from java class Main.java to...

How to set the JSTL variable value in javascript?

How to set the JSTL variable value in java script? How do I set the ' user ' variable ( JSTL ) value from ' val1 ' ( Java script...

unsupported major .minor version 51.0

I am trying to use notepad++ as my all-in-one tool edit, run, compile etc. I have jre installed, i have setup my path variable to .../bin directory. When I run my "Hello world" in notepad++ , I get this message: java.lang.UnsupportedClassVersionError: test_hello_world : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defin...

NumericUpDown Requesting Help - VB.NET (Visual Studio 2010)

In my Visual Basic 2010 Express application I have the following code: Dim pNo As Integer If (pNo = 0) Then pNo = numericUpDown.Value 'If the value is 0 then it becomes the variable: If (pNo > numericUpDown.Value) Then 'If the variable is greater than the stored variable: If (pNo / 2 >= numericUpDown.Minimum And numericU...

Implementing BDD with webdriver API (JBehave+Webdriver)

I'm trying to enhance my Webdriver script by implementing a BDD framework . I came to know about JBehave (JBehave+Webdriver) but before going ahead with this I have my concern over how much java code implemenation is needed bcos I'm mainly into automation testing. As per my perception JBehave works in three steps : (i) Adding Story files...

Error: Could not find or load main class

I am having trouble compiling and running my Java code, intended to allow me to interface Java with a shared object for Vensim, a simulation modeling package. The following code compiles without error: javac -d . -cp ./apache-log4j-1.2.16/log4j-1.2.16.jar:. /vensim.jar SpatialModel.java VensimHelper.java VensimException.java VensimContextR...

Pass variables to ActionListener in Java

I have something like the code below: for(int i=0;i<10;i++){ button=new JButton(buttons[i]); button.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { setPage(i); } }); menu.add(button); } However, the variable isn't defined in the scope of the ActionListener class. How can I pass the variabl...

Java error "Value of local variable is not used"

I am really new to java (started learning 2 days ago). Sorry if this is a stupid question. I am trying to learn how to use rt.exec & similar methods so I tried to make a very simple program which runs calc.exe. This is the code: public class main { try { Runtime rt = Runtime.getRuntime() ; Process p = rt.exec("calc.exe") ; catch(Excep...

Automatically convert Scala code to Java code

I have an app written in Scala and some of my team members want a Java version of it. It is a demo app to use another API written in Scala, and they want a Java version of the app to be able to use the API from Java. However, the app is somewhat large and I don't want to manually rewerite in Java (and they don't want to learn Scala). Is t...

Error "C3145" and "C2061" in C++ Visual Studio

A am brand new to the world of C++, and hae previously done all my work in Java. I am unframiliar with the use of pointer and garbage collection (though I believe I understand the concept) and I believe that may be the source of my problems. I am getting the following messages: 1>Runner.cpp(6): error C3145: 'formOutOfTime' : global or...

Does java.awt.Robot.waitForIdle() wait for events to be dispatched?

I'm using java.awt.Robot for integration tests of my Swing application, but I'm having trouble running my actions in the correct order. How can I tell the thread that calls robot.mousePressed(...) to block until Swing is finished dispatching that event? Apparently, robot.setAutoWaitForIdle(true) does no good. Here's my demo. I expect t...

Phantomjs calling functions with variable

i am really really sorry for such a stupid question i am really new to this and i was asked to do this task but i have no clue how to make this work i am trying to put this code into a variable and then call that variable from phatom and phantom should generate graph eg: i save this code in var test="code" then i call test in phantomjs an...

Access static variable from instance object in Java

I wonder why could we access static varibale from instance object in Java, like the code below? public class Static { private static String x = "Static variable"; public static void main(String[] args) Static member = new Static(); System.out.println(member.x);...

Terminating an Executor Service and extremely fast Java code?

In the code below I call a function via a threadpool many times. Within this function I keep track of the fastest execution of the function via a global attributed called FastestMemory. However, when I print out the value, after the threadpool loop, I am given the original value, as if the global variable is not the same as the variable b...

Missing value in Java

What is the statement that can be used in Java to represent a missing value of a variable. for instance I want to write a code: if (a>=23) income = pay_rate; income is missing;...

Cannot refer to non variable inside Action listener (Jframe)

The following program's goal is to ask the user to input a resistor value, then of which the program will output the corresponding colors for each digit. This thus not include all the digits. However, that program is done, I've made an attempt to incorporate JFrame as an extra thing, except I am hung up on how to print the corresponding c...

ERROR! Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Not on FX application thread; currentThread = AWT-EventQueue-0

I'm not sure what I'm doing wrong. I created a timer that updates a Text graphic at the top of my GUI. When the timer runs out though, it changes a variable (which is linked to a listener), and adds a new graphic 'Scene/Group/Node' to my GUI. -Changing my variable //Linked to a ChangeListener -And adding a Scene to my GUI //Not a liste...

very wierd! eclipse does not find java on my computer?

Hello I am very new and I have a problem that has been bothering me all day today. I have been working on a ROS (robotic OS) and I am using java for part of it. The java code itself works fine, but I just updated my java to the latest java and my whole entire eclipse can not find java... even programs like minecraft do not work. I did che...

Launching CYGWIN-built executable from Java on Windows 7 fails with "error while loading shared libraries: ?: No such file or directory"

The code in question has worked in more or less the exact same configuration on earlier releases of Windows, however, it is not known to have run on Windows 7 YET! That's what I need to solve now. Briefly, some C code performs some configuration and security checks before launching a java program, passing some data that would be neigh-int...

PDF/A1A (XMP Tagged PDF) with XML datasource (JaserReports/iText)

Hello, I'm trying to run the code underneath, but it fails with the error: Code: Exception in thread "main" java.lang.ClassCastException: com.itextpdf.text.Document cannot be cast to org.w3c.dom.Document Here's the actual code. It seems that I'm combining two different Document classes, but I don't know how to solve it. If my co...

Can't run Java example for Selenium / WebDriver

Having a problem getting going with Selenium on Java. I'm trying to follow the example on this page: http://code.google.com/p/selenium/wiki/G ettingStarted I'm typing this: $ javac -cp . -cp ~/Downloads/selenium-2.20.0/selenium-jav a-2.20.0-srcs.jar -cp ~/Downloads/selenium-2.20.0/selenium-jav a-2.20.0.jar -g Example.java And getting this:...

Determine if variable is defined in Python

How do you know whether a variable has been set at a particular place in the code at runtime? This is not always obvious because (1) the variable could be conditionally set, and (2) the variable could be conditionally deleted. I'm looking for something like defined() in Perl or isset() in PHP or defined? in Ruby. if condition: a =...

How to compile java code from a .net application?

I am creating a source code editor for Java using C# in .NET 4. I need to know how I can interact with the jre to compile the java code on my application editor interface from .net. I wish to display the user any errors on the code as well. Any ideas on how to accomplish this will be greatly appreciated.

Platform independent socket communication between Java and C++

Hello forum, I would like to build a simple Java server that can receive TCP messages from different endpoints that use Java, C++ or any other language. As far as I know the following message properties are critical: byte order, encoding and number representation. However, I don't know which Java Streams and Writers write Java specific co...

How to change iReport font as parameter

i have application that generate report with custom font style, like font family, color,size and style(bold,italic,underline). And i use all font-family from Windows System. I try to use parameter in .jrxml file. Like this : Code: And in the text : Code: ... ... When i preview in iReport, it log error : Code: Error filling print... Font '...

How can I give a number to a symbolic variable in MATLAB?

I try to declare a symbolic variable in MATLAB with this code: syms a; I do my computation on this variable and all thing is fine. But my problem is that, I don't know how can I give a number to variable and get the result as a number. For example the answer of my code is answer=exp(-10*a); For instance I want to give 40 to "a" and get...

Oracle function returns date but no time when called via JPQL

I have an Oracle function which accepts amongst other things, a date as parameter, and returns a date. The function is like this: FUNCTION my_func(par1 IN DATE, par2 IN NUMERIC) RETURN DATE AS ret_val DATE; BEGIN I need to call this function in my Java application, and am currently doing so with JPQL. The code is for a web application run...

Import java files

Hi , I'm doing my first steps in java so please be gentle ... enclosed a part of a java program . Q -1 - From where those files are imported ? ( what is their path ? ) Q -2 - Does those files are related to the java version that I have on my PC ? Code: package SensorMonitor; import java.io.*; import java.net.*; import javax.net.ssl.*; imp...

"start" cannot be resolved to a variable

This code works as it should (subtracting the days between 2 dates), but it shows as an error in Eclipse and I'm trying to figure out how to clean it up so it doesn't give an error. I didn't write the code, btw.... <c:set var="start" value="${move.moveStart}"/> <jsp:useBean id="start" type="java.lang.String"/> <c:set var="e...

Using local workers in OpenCL for large matrix computation

I'm a newbie to using OpenCL (with the OpenCL.NET library) with Visual Studio C#, and am currently working on an application that computes a large 3D matrix. At each pixel in the matrix, 192 unique values are computed and then summed to yield the final value for that pixel. So, functionally, it is like a 4-D matrix, (161 x 161 x 161) x 19...

Could xsl:variable be defined twice with same name

Could xsl:variable be defined twice with same name in same scope. For code similar to the following: <xsl:template match="\"> <xsl:variable name="status" select="normal"/> <xsl:variable name="status" select="failed"/> </xsl:template> Maybe it depands browse's type. What is the standard?...

Change an environnement variable with PHP

I would like to give a variable from PHP to bash without using the standard output. My problem can be reduced to the following one: How to make this code work? export A=1; php -r "echo 'variable A equals: '.\$_SERVER['A'].\"\n\";" php -r "\$_SERVER['A']=0;" echo $A...

Auslesen von NFC und dann im JTextArea anzeigen ?

Hi Leute, ich habe ein Problem mit dem Anzeigen des Outputs in einem JTextArea. Durch System.out.println() sehe ich das Output jedoch nicht im JTextArea. Wisst ihr wie ich das anzeigen könnte ? Ich speicher den String in einer Variable studentDetails, die ich aus einer anderen Klasse rufe(die Klasse liest das Output durch NFC)und dann in...