How To Use External Libraries
Dec 23, 2014
I need to build an application that can preform measurements. So I have a measuring device that can be connected through USB (with a rs232 converter aka VCP).The manufacturer provided me with two libraries:
C++ : a library (.lib) file and a header (.h) file
VB6 : a DLL (.dll) file and a list (.txt) with all the available functions
And also some demo code. Can't get the C++ code running with my Borland C++ 5.5 compiler but the VB6 code is working.What can I use to integrate into my java code.
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Dec 10, 2014
I'm currently using TextPad or command prompt to compile and run my programs, and as usual I am not having any luck importing external libraries, in particular apache commons.
I couldn't see any particularly obvious settings in TextPad to set a library or class path (which is annoying as I really like the program), so I jumped back to cmd prompt to run it from there. Aaaaaand i don't understand .
This is my file structure at present:
/mainProject //includes .java and .class files, and where I've successfully placed .jar files before.
The apache commons zip file was extracted here, making:
/mainProject/commons-lang3/apidocs/orgs/apache/commons/<folders> //the commons-lang3 folder contains the jars I'm navigating to the /mainProject folder in cmd prompt and typing (amongst many other things) javac -cp /mainProject/commons-lang3 MonsterGame.java //with the -cp being pointed at the folder the .jar is in i've tried pointing it at the root folder where the import statement begins in the code (ie mainProject/commons-lang3/apidocs), tried moving the .jar files to the mainProject folder (pointing -cp at it) and more. No luck.
it seems everytime i try to import a new library something goes wrong..... its become a bit of a stumbling block to be honest. I seem to spend most of my time dealing with the 'administrative' side of coding (that was the politest way i could put it ), am I not doing it right?
I've read I'm supposed to include the .jar in the classpath, not just the directory. is this correct? (it still doesn't work...!)
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Aug 7, 2014
So I prefer to use Emacs rather than using Eclipse or some other IDE and I am wondering how to include external classes in my main file?
For instance I have my main file (the one that includes my 'main()' function) and then I have another class (seperate file(s)) for creating a GUI, or making a game and using a Player class, Weapon class, etc. How can this be done? Do I just use 'extends myclass'?
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Nov 18, 2014
I've been trying this for hours but it's not working. I'm trying to add the sea glass look and feel library to my project but I still get the error:
Exception in thread "main" java.lang.NoClassDefFoundError: List (wrong name: list)
What should I do? I've added the library to "project settings >Required Libraries" and did not forget to check the box. I've also imported the L&F so it can't be that.
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Nov 22, 2011
I'm researching the viability of a project. One of the requirements is that a "play slip" will be used to read input. I've searched for open source Java libraries that utilize OMR's (optical mark reader) but to no avail. I have located a C library that fulfills the task- is there a way in Java to access/use non-native language libraries?
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Apr 21, 2014
I am doing a few Spring tutorials and in eclipse and for each tutorial I have to right click my project, build path, and then add external archives and then select the spring JAR files I want to bring in and use before my project will successfully compile and run. I was just wondering is this required for every project or is there a way I can set eclipse up to look in these locations for every project without me having to explicitly tell it too?
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Mar 11, 2014
I am responsible for an application which the developer did not build with ANT and also, he had the libraries sitting on his local machine.
Do you have any recommendations on what I should do with these libraries, knowing they were parcelled out and sitting on his local machine instead of in the project itself (Eclipse IDE workspace)?
I am building a script in ANT but don't really know what to do with his libraries. I did get a bunch of compilation errors earlier when I did not have the libraries, but now that I have them, I don't really know where to put them.
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Feb 7, 2015
I'm trying to make my first servlet, however since I have only installed the Java SE, the javac compiler is complaining about missing packages (javax.servlet.http...)
I've realized now that I need javax.servlet jar or class files from Java EE, but after downloading java_ee_sdk-7u1.zip from Oracle here I'm not seeing any .sh or java_ee_sdk-7-jdk7-macosx-x64.sh installer (which I saw mentioned elsewhere). The oracle page only instructs to unzip the downloaded file, and searching for javax.servlet only reveals a few files which I'm not sure what to do with:
javax.servlet-api.jar,
javax.servlet.jsp.jar,
javax.servlet.jsp-api.jar,
javax.servlet.jsp.jstl.jar,
javax.servlet.jsp.jstl-api.jar,
javax.servlet.ServletContainerInitializer,
How do I go about installing the Java EE libraries I need? I am on a mac, and I'd like to do this without IDE, using the command prompt if necessary.
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May 16, 2015
I am not necessarily 'new' to java, however I have always used NetBeans so I am not entirely sure how to do what I need with the terminal commands. I am trying to execute a java jar file(which works perfectly on windows) on the Raspberri Pi, essentially debian linux.
As I mentioned previously, I have a java jar file which I can execute on windows, but it depends on three other libraries, namely RXTX, MySQL, and JSON. I am not positive how to compile this into a jar, or execute it in debian.
This was how I attempted to load two of those libraries, however the last line is the error I received.
Direct copy from the terminal:
pi@raspberrypi ~/Desktop $ java -Djava.library.path=/usr/lib/jni -cp /usr/share/java/RXTXcomm.jar:/usr/share/java/mysql-connector-java-5.1.10.jar:. Automation_System.core.HAS
Error: Could not find or load main class Automation_System.core.HAS
Specifically, the problem seems to be that I cannot use the -cp flag to indicate classpaths, and the -jar flag indicating I am executing a jar in the same command. I am not sure how to point the compiler to my main class HAS in the core package of the jar, and also to the libraries referenced.
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Jun 8, 2014
I wrote my own class to represent univariate polynomials and it works fine, but I was quite sure I was reinventing the wheel, and should obviously like to extend my program's functionality using other kinds of mathematical object.
I've been looking and there are of course open source libraries available which contain everything I'd want to do myself, and more, and probably better, saving me a lot of work.
However the usefulness of this kind of library extends far beyond simple practice and would be invaluable in developing more complex applications.
If I were to plan to write an application that I would at some point in the future like to compile into an executable and sell, would I need to take care about any open source libraries used that the compiler relies on? If so, would it be possible at that stage to use just the API and write my own classes replicating the functionality to avoid breaking license agreements?
The library I'm looking at right now is distributed under the Apache license.
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May 5, 2014
I have been working on project (developing web interface for generating dynamic reports)for that i have downloaded dynamic reports library and i want this library to be imported for my project to jsp page on netbeans 7.2 how can i do it?
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Jun 16, 2014
I am writing a console application that is to make use of the system editor on *NIX. For that I have written a method which writes a string to a file, launches an editor to change that file, and then reads the file again. The problem is the call to run the editor doesn't wait for that application to have closed.
Java Code: Runtime.getRuntime().exec(editorcmd + " " + tmpfn); mh_sh_highlight_all('java'); I need the program to wait for the editor to have finished.
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Mar 17, 2014
In our product, we have many different of "roles". Some of these roles are defined in our dataload JSON and others are defined in our bootstrap SQL.
Throughout our code, we refer to specific roles by name. We want to provide some sort of documentation for these roles when we mention them in documentation, but we don't want to maintain multiple definitions/descriptions for these roles (ie: we don't want one for documentation and a separate one for execution).
Any way we can "expose" the role definitions to the documentation? The best thing I've got is adding some sort of "export script" to each generation of the javadocs, but I don't have a clue how, or if, that can even be done...
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Apr 11, 2014
My task is to implement a B-Tree data structure in Java using no libraries.
My current problem is inserting when the root is full, thus the middle key goes to root.keys[0] and then it get the left and right side which are new Nodes separating and inserting their keys. My problem is that for some reason there is a random second number when in the root and secondly my boolean leaf is always false meaning it never detects that the Tree is deeper than root.
The coding makes sense to me and I have tried printing everywhere but still can't seem to find the problem.
public class BTree {
/*
1. You may not modify the public interface of this class. You may however add any additional methods and/or field which you may require to aid you in the completion of this assignment.
2. You will have to design and implement a Node class. The BTree should house Integer objects.
3. You will notice that there are some overloaded methods, some of which work for Integer objects and some with primitive type int. You have to find a way to implement the methods to work with both types.
*/
class BTreeNode {
boolean leaf = true;
int numKeys = 1;
int mOrder;
Integer keys[];
[Code] ....
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Sep 7, 2014
Here's the code and i keep getting this error
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import Desktop.java stuff.freetts-122-bin .zip.freetts-1.2 .javadoc.com.sun.speech.freetts.Voice;;
import Desktop.java stuff.freetts-122-bin .zip.freetts-1.2 .javadoc.com.sun.speech.freetts.VoiceManager;;
[Code] ....
Here it exists
Attached image(s)
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Apr 11, 2014
My task is to implement a B-Tree data structure in Java using no libraries.
My current problem is inserting when the root is full, thus the middle key goes to root.keys[0] and then it get the left and right side which are new Nodes separating and inserting their keys. My problem is that for some reason there is a random second number when in the root and secondly my boolean leaf is always false meaning it never detects that the Tree is deeper than root.
The coding makes sense to me and I have tried printing everywhere but still can't seem to find the problem.
public class BTree {
/*
1. You may not modify the public interface of this class. You may however add any additional methods and/or field which you may require to aid you in the completion of this assignment.
2. You will have to design and implement a Node class. The BTree should house Integer objects.
3. You will notice that there are some overloaded methods, some of which work for Integer objects and some with primitive type int. You have to find a way to implement the methods to work with both types.
*/
class BTreeNode {
boolean leaf = true;
int numKeys = 1;
int mOrder;
Integer keys[];
[Code] ....
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May 22, 2014
I'm running a jar of an application and library jars from lwjgl. I'm creating a java process. It's working on Windows but not on linux.
I tried replacing the semicolons with colons but it didn't work, it just said "Main class not found: Application.natives.linux" or something like that. gamePath is the path the application is in. osName is the name of the operating system.
Here's my code:
String jarRunner = String.format("java -Djava.library.path="%snatives/" + osName + "" -cp "%sjar/lwjgl.jar;%sjar/lwjgl_util.jar;%sjar/jinput.jar;%sjar/slick.jar;%sApplication.jar" main.Main", gamePath, gamePath, gamePath, gamePath, gamePath, gamePath);
Process p = Runtime.getRuntime().exec(jarRunner);
[Code] ....
How can I make it work on linux?
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Oct 9, 2014
I want to create a java program to find the applications running in my computer. And then I want to select a particular application called 'Harvest Client.exec'. Bring the application to front. And Then find a textbox in it and paste the things from clipboard.
I am not sure how to do this. I started by using some Runtime methods. But I am not getting anywhere.
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Aug 25, 2014
I need to count external hyperlinks to other web-sites on each page of the the web-site. I've found this code here on stackoverflow:
public class Scanner {
private HtmlProcessor hp;
private String baseUrl;
private int step = 0;
private List parsedLinks;
public Scanner(String baseUrl) {
[Code] .....
Also I've found other working code that uses standard Java but it counts links only in one web-page. Can't create pattern to look all pages on web-site yet.
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Jul 27, 2012
I want to develop attendance system that scans students fingers for attendance and mark his attendance in database automatically once finger scanned.Is it possible to connect java application to external hardware? If yes what extra knowledge i should know ? How can i connect it ? and what books are good for it ?
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Aug 19, 2014
I was wondering how Java knows where to Import classes from when we don't specify the whole directory path.
For example: import java.util.* Does It automatically search In both your current directory and the directory created during Installation that contains the standard library (wherever It may have been Installed) ?
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Dec 18, 2014
I am suddenly facing error messages when launching my eclipse. Below are the eclipse logs:
!SESSION 2014-12-18 15:17:46.415 -----------------------------------------------
eclipse.buildId=M20130204-1200
java.version=1.8.0_25
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_IN
Command-line arguments: -os win32 -ws win32 -arch x86_64
!ENTRY org.eclipse.osgi 4 0 2014-12-18 15:17:48.105
[Code] ....
I have tried downloading and placing org.eclipse.swt-3.1.jar in the plugins folder of my eclipse and also I tried editing eclipse.ini file with below lines
openFile
-vm
C:Program Files (x86)Javajre1.8.0_25injavaw.exe
-vmargs
but nothing worked.
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Oct 26, 2010
I have a .jar that is installed in other computer(outside netbeans). Everything works fine except with report. I am sure the libraries needed for iReport is added in my lib folder but I receive this error message when I to load the report using the program.I use command prompt to see the error:
Java Code:
java -jar projCosting.jar mh_sh_highlight_all('java');
And here is the error message:
Java Code: net.sf.jasperreports.engine.JRException: Error compiling report java
source files : [b]D:CostingRptCosting_1288072391310_955208.java[/b]
at net.sf.jasperreports.engine.design.JRJavacCompiler.compileClasses
[code]....
I have included the library in lib folder but do you think I have to install the iReport application?
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Feb 27, 2014
I have downloaded and testing these two mapping libraries. I wrote a program which has 100000 iterations and maps the beans of the same class:
public class IntBean {
@JMap
private int int1;
@JMap
private int int2;
[Code] ....
Mappers are created BEFORE iterations start:
private JMapper jmapper = new JMapper(IntBean.class, IntBean.class);
private MapperFactory orikaFactory = new DefaultMapperFactory.Builder().build();
private MapperFacade orikaFacade = null;
orikaFactory.registerClassMap(orikaFactory.classMap(IntBean.class,IntBean.class).byDefault().toClassMap()); orikaFacade = orikaFactory.getMapperFacade();
What is in each iteration:this.orikaFacade.map(a1, a2);
or
a2 = (A) this.jmapper2.getDestination(a1);
I know, that Orika and Jmapper are great libraries from Google and they use reflection in a different way than for example Dozer, which is much slower, they se reflection to generete code somehow..
I have 3 questions:
1) How they work - when the code is generated, during maven build, in runtime - everytime when I create mapper in code? Are they change class code byte dynamically?
2) Why there is this speed difference that I noticed?
3) Which library would you choose and why? Both have the same capabilities? Why both come from Google? Why Google didnt develop Orika and created Jmapper instead?
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Apr 27, 2015
I have this program, I am wondering if it is possible to call files from the main method and sort them into my saveOneRocord method? If so, how would that look?
my orderProcess Class
package stu.paston.finalprogram;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Scanner;
import java.io.File;
import java.io.PrintWriter;
import java.io.FileWriter;
[Code] .....
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Mar 30, 2015
I am reading the excellent book Algorithms. The author of this book is using his own libraries.
I have downloaded the libraries (it is a file called stdlib.jar) and I've store it in a directory called ~/Downloads(I am using a macbook pro).
Then I have created a project with IntelliJ Idea 14.1 using the default package (as it is the only way for a program to 'see' these libraries).
The program is running inside the ide, but because of the nature of this book, all the included code must be run from the command line.
The problem is that I cannot run for example the Average class from the command line because the system asks for the external library.
Specifically the error is :
I enter : java -cp . Average
and the Error I get is :
Exception in thread "main" java.lang.NoClassDefFoundError: StdIn
at Average.main(Average.java:11)
Caused by: java.lang.ClassNotFoundException: StdIn
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
[Code] ....
The Average class is the following :
public class Average {
public static void main(String[] args) {
//Average the numbers on StdIn
double sum = 0.0;
int cnt = 0;
[Code] .....
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