Strange ClassNotFoundException from jar
Recently, our customer support found some ClassNotFoundException informations in log files, they sent the log files to me,
and I found that these classes are exist in jar， and they told me these exceptions only show when our program was busy.
The log file was generated by log4j, these jars were what we developed, and these not found classes are business objects, the class not found exception made
our webservice application can not process business any more. the strange thing is ,when we regenerate jar and replace old ones, the exception no longer appeared.
Is anyone know the reason or how to resolve the problem?
Or , is the server low memery can cause the exception?
WilliamRyan wrote:
Recently, our customer found some ClassNotFoundException informations in log files, they sent the log files to me,
and I found that these classes are exist in jar， and they told me these exceptions only show when our program was busy.
Is anyone know the reason or how to resolve the problem?
How to resolve what problem? You haven't posted any problem that necessarily needs to be resolved.
Nor have you posted ANY information about:
1. what log files you are talking about
2. why you think those log messages indicate a problem of some kind.
3. what class files you are talking about
4. what jar files those class file are in
5. where those jar files came from.
6. what application you are even talking about
7. what that application even does
8. why your customers are digging around in the log files to begin with
9. why you are even concerned about this at all
You haven't said one word about any appilcation working incorrectly or producing incorrect results.
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I get an application that I have to deploy on Weblogic AS. It is big ear with couple of wars inside. Let's say it is bigApp.ear.
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http://www.javaworld.com/javaworld/jw-07-1998/jw-07-jar-p2.html
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http://www.javaworld.com/javaworld/jw-07-1998/jw-07-jar.html
And I did something like this:
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Windows 7 Home Premium (AMD Chipset)
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Firefox 9 nightly (64 bit) works perfectly! Go Firefox!
Internet Explorer 9 (32 bit) loading directly from drive (c:\...)
Chrome (32 bit) loading directly from drive (c:\...)
Firefox 6.0.1 (32 bit) loading directly from drive (c:\....)
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rritoch wrote:
I am developing an applet (extends Applet but uses swing components) using JDK 1.6 (Though these problems still happen in JDK 1.7) and I am unable to get the applet to load on a 64 bit machine in most cases.
To clarify...
1. You have tried it on 32 bit machine? Exactly which OS?I tested this on Windows Vista Business which is in 32 bit mode and the applets run without any problems
>
2. Your only 64 bit tests have involved 2008/Win7?
If so then I would suspect something with windows not java. Probably permissions.
The web server(s) are running on localhost and I am connecting on the same machine using a local network ip address (such as 192.168.*.*)
Yes, I haven't tried running the jars on other operating systems.
>
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I should to submit my project tomorrow . plz help me .
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If you could I need java could for that.
Thanks alot.Hi all ,
I should to submit my project tomorrow . plz help me .
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If you could I need java could for that.
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Please help: Example how to peploy application from jar file step by step
Please help: Example how to peploy application from jar file step by step.
All help appreciated
MikeThanks I will try these links
Mike
"Slava Imeshev" <[email protected]> wrote:
Hi Mike,
These links could be useful:
http://e-docs.bea.com/wls/docs61////adminguide/appman.html
http://e-docs.bea.com/wls/docs61////quickstart/quick_start.html
http://e-docs.bea.com/wls/docs61//////ConsoleHelp/application.html
http://e-docs.bea.com/wls/docs61///programming/environment.html
Regards,
Slava Imeshev
"Mike" <[email protected]> wrote in message
news:3ca0e94c$[email protected]..
Please help: Example how to peploy application from jar file step bystep.
All help appreciated
Mike -
Hi,
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I am using Internet Explorer 5.5 for my browser. I checked the options and everything seems to be in order, but......
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Thank You....once in a jar file i inserted a image
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Did you use the iFixit website? It has excellent pictures and instructions that are easy to follow.
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Iam able load from Local system,
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Unable to read TLD "META-INF/jsf_core.tld" from JAR file "file:
Hallo everybody :-)<br /><br />i've installed Workflow-Server + ARES + FormManager. When i call localhost:8080/adminui i can log in and the browser loads the next site --> it fails and says:<br /><br />org.apache.jasper.JasperException: Unable to read TLD "META-INF/jsf_core.tld" from JAR file "file:/C:/Adobe/LiveCycle/jboss/server/all/tmp/deploy/tmp56414LiveCycle.ear-contents/admi nui.war/WEB-INF/lib/jsf-impl.jar": org.apache.jasper.JasperException: Failed to load or instantiate TagExtraInfo class: com.sun.faces.taglib.FacesTagExtraInfo<br /> org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:5 0)<br /> org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)<br /> org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:183)<br /> org.apache.jasper.compiler.TagLibraryInfoImpl.<init>(TagLibraryInfoImpl.java:181)< br /> org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:418)<br /> org.apache.jasper.compiler.Parser.parseDirective(Parser.java:483)<br /> org.apache.jasper.compiler.Parser.parseElements(Parser.java:1539)<br /> org.apache.jasper.compiler.Parser.parse(Parser.java:126)<br /> org.apache.jasper.compiler.ParserController.doParse(ParserController.java:220)<br /> org.apache.jasper.compiler.ParserController.parse(ParserController.java:101)<br /> org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:203)<br /> org.apache.jasper.compiler.Compiler.compile(Compiler.java:470)<br /> org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)<br /> org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)<br /> org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)<br /> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)<br /> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)<br /> org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)<br /> javax.servlet.http.HttpServlet.service(HttpServlet.java:810)<br /> com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)<b r /> com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)<br /> com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)<b r /> com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)<br /> com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)<br /> javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)<br /> com.adobe.framework.SecurityFilter.doFilter(SecurityFilter.java:177)<br /> com.adobe.idp.um.auth.filter.PortalSSOFilter.doFilter(PortalSSOFilter.java:106)<br /> com.adobe.framework.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter .java:161)<br /><br />Any idea what' wrong?<br /><br />Thanks,<br />Valerio
Hi Howard,
thank you for your post.
I actually new about the problems with the jvm version. Still i wanted to ask, cause there are different reports on this `java problems` and even though the 1.4.2_08 seems to be the best version (by the way this version is not to be downloaded any longer *sig*), there are people getting all installed with other versions. I couldn't find any regularity in the misbehavior of the servers while installing.
I finally achieved and got everything working ... but very slow. Loading the adminui or BAM features takes very long time (over one minute). Have you already had this delay. Any hint?
Thanks again,
Valerio -
Problem loading image from jar file referenced by jar file
First, I searched this one and no, I didn't find an answer. Loading images from jar files has been pretty much done to death but my problem is different. Please read on.
I have my application, a straight up executable running from Eclipse. It uses a jar file, call it JarA. JarA launches a GUI that is located in another jar file. Call it JarB. To recap:
My application calls JarA -> JarA loads classes from JarB -> JarB looks for images to place in a GUI it wants to show on the screen
When JarB goes to load an image the following happens:
java.lang.NullPointerException
at sun.misc.URLClassPath$3.run(URLClassPath.java:316)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:313)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:290)
at sun.misc.URLClassPath.findResource(URLClassPath.java:141)
at java.net.URLClassLoader$2.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findResource(URLClassLoader.java:359)
at java.lang.ClassLoader.getResource(ClassLoader.java:977)
at org.cubrc.gmshell.gui.MainWin.preInit(MainWin.java:152)
at org.cubrc.gmshell.gui.MainWin.<init>(MainWin.java:135)
The code from JarB that loads the image looks like this:
URL[] oSearch = {Main.class.getResource("images/")};
URLClassLoader oLoader = new URLClassLoader(oSearch);
imgIcon = new ImageIcon(oLoader.getResource("icon.gif"));
imgMatchRunning = new ImageIcon(oLoader.getResource("gears.gif"));
imgMatchStill = new ImageIcon(oLoader.getResource("gears-still.gif"));
imgMagnify = new ImageIcon(oLoader.getResource("magnify.gif"));This looks right to me and JarB certainly has an images directory with those files. But I'm in hell right now because I don't know where to place the images to make this work or if you can even attempt to load images with a dependency chain like this.
Any help very appreciated!Have you tried to move your image-files out of the jar file and place them in the sam folder as the jar-file? I think that would help.
When you try to load the image-file you get the NullPointerException because the program tries to read a file it can't find. Remember that a jar file IS a file and not a directory.
If you want to read somthing inside the jar-file you need to encode it first.
Have you tried to read the jar-file with winRar. It makes it easy to add and remove files in your jar-file. -
Found a good solution that works from running in command line, i.e java -jar or normally or using web start and not getting missing image URL loading from jar
It deserves some dukes :) Also, someone can improve on it to make sure it's 100%
Asume the function is in a package AWTUtilities class
Many forums provide close solution but they all forget the vital replacing back slash with forward slash when reading from jar!! :)
That's what got me stump for a good day trying to figure why it should load the images, but it's not...
Regards
Abraham Khalil
// The subtlety in getResource() is that it uses the
// Class loader of the class used to get the rousource.
// This means that if you want to load a resource from
// your JAR file, then you better use a class in the
// JAR file.
public static Image getImageResource( String name ) throws java.io.IOException {
return getImageResource( AWTUtilities.class, name );
public static Image getImageResource(Class base, String name ) throws java.io.IOException {
if (name != null) {
Image result = null;
// A must, else won't pick the path properly within the jar!!
// For file system forward or backward slash is not an issue
name = name.replace('\\', '/');
// For loading from file system using getResource via base class
URL imageURL = base.getResource( name );
// For loading from jar starting from root path using getResource via base class
if (imageURL == null) {
imageURL = base.getResource("/" + name );
// For loading from file system using getSystemResource
if (imageURL == null) {
imageURL = ClassLoader.getSystemResource( name );
// For loading from jar starting from root path using getSystemResource
if (imageURL == null) {
imageURL = ClassLoader.getSystemResource("/" + name );
// Found the image url? If so, create the image and return it...
if ( imageURL != null ) {
Toolkit tk = Toolkit.getDefaultToolkit();
result = tk.createImage( (ImageProducer) imageURL.getContent() );
return result;
else {
return null;The problem is that you use the wrong classloader. The system default classloader is the one that launched the webstart utility. It doesn't contain your classes or jars. You have to get hold of the classloader for your classes.
Here's my solution as a schetch: probably it won't compile but you get the idea:
// 1: get hold of the classloader for my classes:
// - this class cannot possibly be loaded by anyone else:
Object dummy = new Object(){
public String toString() { return super.toString(); }
ClassLoader cl = dummy.getClass().getClassLoader();
// 2: get an inputstream to read resource from from jar:
InputStream is = cl.getResourceAsStream("images/myimage.gif");
// 3: create image from inputstream
// can be done in many different ways using tmp-files etc.
ImageIcon icon = new ImageIcon(is);
Image img = icon.getImage();
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