How to load a Jar file in the class path?

How to load a Jar file which contains class files, images, etc.. in the classpath without using URLClassLoader.

You don't "load" jars. If it's on the classpath, you can obtain individual resources from it using various methods on either Class or ClassLoader. Do you mean "how to add a jar to the classpath at runtime"? Can't be done without using a classloader, typically URLClassLoader or a subclass thereof. Why you want to not use the proven method is beyond me. Presumably because you don't understand classloading. In which case, forget it.

Similar Messages

How do I add a jar file into the build path of the compiler?

Hey,
I'm trying to import a jar file into the build path of the compilation process, but it does not find the packages or the classes that are in it.
I think I don't add it right...
          ArrayList<String> options=new ArrayList<String>();
          options.add("-d");
          options.add(targetDirectory);
          options.add("-classpath");
          for(String str:includeDirectory)
               options.add(str);
          if (!compiler.getTask(writer, fileManager, diagnostics, options, classes, compilationUnits).call());
                ....and I've tried this way:
     public void setTargetDirectory(String targetDirectory) {
          this.targetDirectory = "-d " + targetDirectory;
     private void compile(Iterable<? extends JavaFileObject> compilationUnits) throws Exception {
          ArrayList<String> options = new ArrayList<String>();
          options.add(targetDirectory);
          String classPath="-cp ";// tried this also with "-classpath"
          for (String str : includeDirectory)
               classPath+=str+":";
          options.add(classPath);
     if (!compiler.getTask(writer, fileManager, diagnostics, options, classes, compilationUnits).call())
          // throw new Exception("Compilation Error");
     }Thanks in advance,
Adam.
Edited by: Adam-Z. on Feb 24, 2010 5:41 AM
Edited by: Adam-Z. on Feb 24, 2010 5:42 AM

Thank you for your reply,
Q: Are there .class files in that directory in that jar file? (the compiler doesn't ( can't )) look for directories, it can just look for specific files , and scan to get a list of all files matching certain criteria. So if there are no class files, it will say the package doesn't exist, even if there is a directory, possibly containing other files.yes there are class files in the jar, the tree structure:
j2MeDataChunkGenerator_Plugin\(lots of class files)
META-INF\manifest.mf
and thats it.
, your code will only work on windows because other platforms use a different path separator. You should use java.io.File.pathSeparator not explicit ';" when building your classpath. (this is unrelated to your problem, but you should correct it)will do, thanks.
Q: Is that error in your post formatted by your own diagnostics? (we could possibly help you better if we didn't have to guess!!)I would not post my own error code, this text is generated by the compiler diagnostic.
{code}
     System.err.println(" Error details: " + diagnostic.getMessage(null));
{code}
Q: Is line 3 of ImageCroper_Editor.java (sic) an import statement? (we could possibly help you better if we didn't have to guess!!)it is an import error... didn't the error message stated that it is an import problem? wired, I'm sure before it did. anyway it is an import error.
Also you don't show us what the variable includeDirectory is in terms of type, and contents, that might be helpful. (we could possibly help you better if we didn't have to guess!!)It has only one String object: "D:\%Important Documents\WorkSpaces\PacMan\ApplicationManager\Plug-in\Data Chunk Designer.jar"
the last file on the classpath list.
Q: Have you proven this? that i did post, in this long line of text.
Q: Is the compiler finding other classes (in other packages) in that same jar file?No. all the class files are in the jar, they all have entries that start with "j2MeDataChunkGenerator_Plugin\*.class", and since I get 47 errors I guess it does not load any other class.
thank you for you comments, the problem with having these errors, is that I can't even get a piece of information where this error is coming from, only that it is an import loading error package not found, what does that mean? that the jar was not loaded in compilation(no error about this), that the jar is corrupted(no error about this), that the path is incorrect(it is correct I made sure), that there is no such package in the jar(There is), that the compiler does not load the package(does it even do that?), really I can't even guess why this happens, I've been at this on and of all day today, really annoying.
Thanks,
Adam.

How to open a .JAR file on the Z30

Hi,
Would anyine know how to open a .JAR file on the Z30?
I get a message saying "Unable to open" when I click on the .jar file i want to open in my blackberry & install.
Cheers
Mario

JAR files are for older java phones, they dont work on BB10
maybe you should look into using SNAP to get some apps yoru looking for
http://supportforums.blackberry.com/t5/Downloaded-Applications-for/You-Upgraded-to-OS-10-2-1-and-wan...
Click here to Backup the data on your BlackBerry Device! It's important, and FREE!
Click "Accept as Solution" if your problem is solved. To give thanks, click thumbs up
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How to refer a .jar file in the code.

How to refer a .jar file in the code.
I want to use a library dnsjava.jar, which I download from the internet. I want to know how to refer it
If I am compiling the code on Solaris
If I compiling the code on windows using eclipse.
I added the following line in my code to refer to this library. But it always complains of not found the class
import org.xbill.DNS.*;
I tried the following to add this library but did not work
On eclipse/windows: Went to window-> preferences -> BuildPath _> class path Variable.
On Solaris: Could not add this library /opt/java_reference/v1.6.0_04/jre/lib. Although I am logged in as root, but not able to add the library there. Complains of Permission denied.

Set the classpath option when compiling.
javac -classpath /path/to/lib/dnsjava.jar YourProgram.java
I don't use Eclipse, but it probably has a library list on your project preferences. Add it there.
Regards,
Henrique Abreu

How to call a jar file for the dynamic menu

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I am using JDEV 11.1.2.2.0 version.
My problem is this,
when dynamic tree populate using java bean class(data come from the table)
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plz help...
-Harsh-

Hi,
projects are a design time functionality. So what is the use case? I it is a Java object stored in the JAR file then you would configure this JAR file in the ViewController project library section (project properties)
Frank

How to load/save a file in the WEB-INF?

how can i load and save files in the WEB-INF directory using servlet?

This doesn't save files. And in order to reuseability and maintainability, I'd rather use java.io and passing the path/filename around in File object.
You can retrieve the absolute path for "/WEB-INF" byString absoluteWebInfPath = getServletContext().getRealPath("/WEB-INF");Then you can use that to read/write files.
File file = new File(absoluteWebInfPath, "filename.ext");
InputStream input = FileUtil.read(file);
FileUtil.write(file, input);and so on.

Which JAR file has the class weblogic.xml.domimpl.Loader ?

when an Axis web-service WSDL is read and parsed using weblogic client - i get this error. which weblogic-10 jar file has this class "weblogic/xml/domimpl/Loader" ?
java.lang.NoClassDefFoundError: weblogic/xml/domimpl/Loader
at weblogic.wsee.util.dom.DOMParser.getWebLogicDocumentImpl(DOMParser.java:168)
at weblogic.wsee.util.dom.DOMParser.getDocument(DOMParser.java:58)
at weblogic.wsee.wsdl.WsdlReader.getDocument(WsdlReader.java:311)
at weblogic.wsee.wsdl.WsdlDefinitions.parse(WsdlDefinitions.java:402)
at weblogic.wsee.wsdl.WsdlDefinitions.parse(WsdlDefinitions.java:388)
at weblogic.wsee.wsdl.WsdlFactory.parse(WsdlFactory.java:78)
at weblogic.wsee.wsdl.WsdlFactory.parse(WsdlFactory.java:65)
at weblogic.wsee.jaxrpc.ServiceImpl.loadWsdlDefinition(ServiceImpl.java:468)
at weblogic.wsee.jaxrpc.ServiceImpl.<init>(ServiceImpl.java:114)
at com.qwest.assia.service.client.Provisioning_Info_Impl.<init>(Unknown Source)
at com.qwest.assia.service.client.Provisioning_Info_Impl.<init>(Unknown Source)
at com.qwest.iom.connector.adapter.webservice.qcontrol.AssiaWebServiceConnectionFactory.getWebServiceConnection(AssiaWebServiceConnectionFactory.java:64)
at com.qwest.mdw.connector.webservice.WebServiceConnectionFactory.getConnection(WebServiceConnectionFactory.java:25)
at com.qwest.iom.connector.adapter.webservice.qcontrol.AssiaWebServiceTestCase.test_MyAccountWebService(AssiaWebServiceTestCase.java:51)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)

Hi,
I found it in ADF 11g R2 documentation - http://docs.oracle.com/cd/E24382_01/web.1112/e16182/taskflows_regions.htm#insertedID10
I guess this is 11g R2 feature.
I have a requirement to display the multiple regions dynamically. This feature suits my requirement perfectly, but unfortunately it is not available in 11g R1.
Can we achieve the similar functionality in 11g R1 through other means?
Thanks
Ravi

HOw to create a text file in the given path and delete it after the use?

Hi all,
I am trying to create a text file at the given path and delete the created file after the use.
I am using following code.:
import java.io.*;
// write binary data as characters
public class RanIO {
                                        public static void main(String f[])
                                                  // First illustrate append
                                                  String lineSep = "\n";
                                                  try {
                                                                 File temp= new File("C:/Ash","cute.txt");
                                                  boolean ch=temp.createNewFile();
                                                  if(ch)
                                                       System.out.println("file created");
                                                  else
                                                  System.out.println("file Not created");
                                                  //writing to file
                                             /*     PrintWriter p = new PrintWriter(new BufferedWriter(new FileWriter("cute.txt",true)));
                                                  p.print("Emp NO");
                                                  p.close();*/
                                                            // Open fileWriter in append mode
                                                                           FileWriter fos = new FileWriter(temp, true);
                                                                           BufferedWriter bw = new BufferedWriter(fos);
                                                                           PrintWriter pw = new PrintWriter(fos);
                                                                           double d=550;
                                                                      // lineSep = System.getProperty("line.separator");
                                                                      pw.print("Hello");
                                                                      //pw.print( lineSep );
                                                                      pw.print( d );
                                                                      pw.close();
                              boolean det=temp.delete();
                                             if(det)
                                                  System.out.println("File deleted");
                                             else
                                                  System.out.println("File not deleted");
                                             } catch (IOException ioe)
                                                            System.out.println( "Append IO error:" + ioe );
My problem:
1)
I am not able to write to the file. I want to know, where i am going wrong.
It is giving error message like
"Canot resolve Symbol: temp,"
But, FileWriter Constructor should accept a File type parameter.
here temp is a file parameter.
If i am not using file=new file();
i can't delete the file after the use. i.e if i use
PrintWriter p = new PrintWriter(new BufferedWriter(new FileWriter("cute.txt",true)));
how can i delete cute.txt after the use?
2)
I am not able to write to the text file. file is created but, a blank file.
"Hello" is not written into the text file.
can anyone help me in this regard
Thanks in advance
Ashvini

Thank you Ram,
But, i want to create a text file in Append mode.
for that i used
FileWriter fos = new FileWriter(temp,true); But, it is not accepting FileWriter constructor in
this format. if i use
FileWriter fos = new
FileWriter("c:/ash/cute.txt",true); it works fine. !!!!!Here's the javadoc
public FileWriter(File file,
boolean append)
throws IOExceptionConstructs a FileWriter object given a File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning.
Parameters:
file - a File object to write to
append - if true, then bytes will be written to the end of the file rather than the beginning
Throws:
IOException - if the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason
Since:
1.4
Are you using jdk.13 or lower ?
>
ONe more doubt, Does flush method deletes a file?
if not, then i need to use
File temp=new File("c:/ash/cute.txt");
FileWriter fos = new FileWriter(temp,true); //which
is again a problem
if(temp.delete())
out.println("File is deleted");
}I don't know whether i am taking it wrong ! or
anything wrong with my coding ! but, after creating
and writing data into a text file. I must delete it
as it contains confidential informations.
Regards,
Thanks.'flush' writes to a file immediately. Else you should explicitly call 'flush' to write contents from buffer to underlying source.
javadoc again
PrintWriter
public PrintWriter(Writer out,
boolean autoFlush)Create a new PrintWriter.
Parameters:
out - A character-output stream
autoFlush - A boolean; if true, the println, printf, or format methods will flush the output buffer
cheers,
ram.
Question; What do you gain by opening a file, writing to it and deleting it in the same program ?

Which jar file has the class TaskFlowBindingAttributes?

Hi,
I'm using JDeveloper version - 11.1.1.6
I want to know which jar file consists the TaskFlowBindingAttributes class?
I looked into following location - JDEV_HOME\oracle_common\modules\oracle.adf.controller_11.1.1\ and didn't find this class in jar files located here. (adf-controller.jar, adf-controller-api.jar and adf-controller-rt-common.jar)
Any inputs would be helpful.
Thanks
Ravi

Hi,
I found it in ADF 11g R2 documentation - http://docs.oracle.com/cd/E24382_01/web.1112/e16182/taskflows_regions.htm#insertedID10
I guess this is 11g R2 feature.
I have a requirement to display the multiple regions dynamically. This feature suits my requirement perfectly, but unfortunately it is not available in 11g R1.
Can we achieve the similar functionality in 11g R1 through other means?
Thanks
Ravi

How to load a XML file into the database

Hi,
I've always only loaded data into the database by using SQL-Loader and the data format was Excel or ASCII
Now I have to load a XML.
How can I do?
The company where I work has Oracle vers. 8i (don't laugh, please)
Thanks in advance!

Hi,
Tough job especially if the XML data is complex. The have been some similar question in the forum:
Using SQL Loader to load an XML File -- use 1 field's data for many records
SQL Loader to upload XML file
Hope they help.
Regards,
Sujoy

How to create a .jar file for the BPEL project

hi all,
how can i create a .jar file for my BPEL project, i am trying to deploy the project but getting an error :
"Error: [Error ORABPEL-10902]: compilation failed [Description]: in "C:\OraBPELPM\integration\jdev\jdev\mywork\Workspace_BPELDemo\BPEL_Report\BPEL_Report.bpel", XML parsing failed because "". [Potential fix]: n/a. "
and when doubel cliking on this error Jdev take me to the beginning of the ".bpel" file.
I 'm really stuck in here i am not able to deploy the process!
Thanks,
Rana

Rana:
If you haven't already, I would post this question in the BPEL forum. I would expect a much better turnaround there.
Johnny Lee

How can I add jar files into the namespace in code?

My friends:
I need to add jar files into my namespace dynamicly in my code.But the jar files might be repeated, I am not sure.so, i wonder how can I add them into my namespace, ignoring the repeated files?
This is my code:
URL[] urlArrayA = new URL[5];
urlArray[0] = sample1;
urlArray[1] = sample2;
URL[] urlArrayB = new URL[5];
urlArrayB[0] = sample3;
urlArrayB[1] = sample4;
URLClassLoader urlClassLoaderA = URLClassLoader.newInstance(urlArrayA);
URLClassLoader urlClassLoaderB = URLClassLoader.newInstance(urlArrayB);
how can i visit classes in urlClassLoaderA from classes in urlClassLoaderB?

could anyone please answer the question for me ? thank you...

How to build a jar file so the program can access its resources folder?

I have a java program written by someone else in which I have made a trivial change (I changed the background color). The jar file runs but it does not find one of the resources file.
Here is the project folder's structure
mainClass.txt (manifest text file)
folder resources (includes file Java does not find: order.txt, a text file)
folder CFPT ( includes .class files)
folder cpl (includes .class files)
folder results
I tried
jar cvmf mainClass.txt CFPT0.jar CFPT/*.class cpl/*.class resources results
I get a lot of "adding: resources/..."
including the one pertaining to the files which is later not found
adding: resources/order.txt(in = 411) (out= 169)(deflated 58%)
the code that chokes right now is the following,
Object i = new Object();
InputStream is = i.getClass().getResourceAsStream("/resources/" + resourceName);
when I run java -jar CFPT0.jar the program runs
but it soon gives an error, cannot find resourceName order.txt (is == null)
I have Core Java Volume 1 page 498 but it does not help me figure out what I am doing wrong.
Can somone help me build the jar file correctly so the program can find its resources?
Is this a classpath issue? What do I need to do?

My last mainClass.txt file content:
Main-Class: CFPT.CFPTRunner
Class-Path: ./resources ./results
I also tried
Class-Path: resources results
Initially I only had the first line.
I put back /resources in the java file as the / is necessary to indicate absolute path.
Otherwise it looks relative to calling class.
I tried adding the path on the second line of the manifest file per Wikipedia example
http://en.wikipedia.org/wiki/Classpath
I looked at
http://java.sun.com/javase/6/docs/technotes/guides/lang/resources.html
If you use the -sourcepath option, the compiler searches the indicated path for source files; otherwise the compiler searches the user class path both for class files and source files.
http://java.sun.com/javase/6/docs/technotes/guides/lang/resources.html
resources
I took out the -d classes and compiled the .class files right with the java files in case that was the problem
javac -classpath . CFPT/CFPTRunner.java
jar cvmf mainClass.txt CFPT0.jar CFPT/*.class cpl/*.class resources results
java -jar CFPT0.jar
Still no go

How to add a jar file in the visual Age classpath

I have to import a jar file in visual Age workspace, and don't know hox to do
I tried several things, but didn't succeded at this point.
I need to succed until tomorrow for completing my work.
Please help, thanks.

Pls do the foll actions:
Step 1:
File -> Import -> Selct radiobutton - "Jar file" -> Next
-> Select the file name(ur jar file) - > click on the java button and ensure that u have selected all the file or what evre files u want " -> Finish
If at all u r not getting any errors but the files are not apperaring in ur Project means go to
Step 2:
From the work bench click
Window -> Reposiroy Explorer -> Select the Project,edition,package or type and right click and from the pop up menu click "Add to Workspace"
This 'd work
All the best for a successful completion of ur work
Pramod

How to sign multiple jar files using the same certificate..?

hi,
I want to run my application using Java Web Start.. i am using around 16 different jar files out of which around 13 are 3rd party component jars. I want to sign these jars using the same certifcate..., i am using the follwing code to sign the jars:
(for the jar file ischeduler.jar)
keytool -genkey -alias signFiles91 -keystore dtss -keypass dtss1351 -dname "cn=dtss" -storepass decisioncraft
jarsigner -keystore dtss -storepass decisioncraft -keypass dtss1351 -signedjar signedischeduler.jar ischeduler.jar signFiles91
keytool -export -keystore dtss -storepass decisioncraft -alias signFiles91 -file ischeduler.cer
keytool -import -alias DCA2 -file ischeduler.cer -keystore Impischeduler -storepass ischeduler
(for the jar file ischedulerclient.jar)
keytool -genkey -alias signFiles92 -keystore dtss -keypass dtss1351 -dname "cn=dtss" -storepass decisioncraft
jarsigner -keystore dtss -storepass decisioncraft -keypass dtss1351 -signedjar signedischedulerclient.jar ischedulerclient.jar signFiles92
keytool -export -keystore dtss -storepass decisioncraft -alias signFiles92 -file ischeduler.cer
keytool -import -alias DCA3 -file ischeduler.cer -keystore Impischeduler -storepass ischeduler
but when i use the above signed jars in my application i get an error saying:
"jars not signed by the same certificate"
can someone plz tel me wher is the error....thanx
andy

Well for mulitple signing of jar files you can use ANT tool. Its easier and faster.
Regarding the present problem -- hmm.. well it looks like you are using 2 different alias names for signing the jar file. Try using the same alias name and that might solve your problem.
regards
Saby

How to load a Jar file in the class path?

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