[SN1974]

Hi
I am getting following error at startup

java.lang.ClassNotFoundException: org.jdownloader.update.launcher.JDLauncher
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:81)
at com.exe4j.runtime.WinLauncher.main(WinLauncher.java:94)
at com.install4j.runtime.launcher.WinLauncher.main(WinLauncher.java:25)

[Jiaz]

@SN1974: Please see here how to fix your installation,
https://support.jdownloader.org/Know...r-installation

[jj0901]

Please I have the same issue here.

The solution does not work. Since I cannot start JD, how can I find the "JD installation directory" as suggested, let alone finding the "Files: Core.jar
Folders: tmp, update:" in it.

I have also tried to uninstall JD, but I can't and failed to do so, how come?

Please can you provide me the solution? I can't use it at all.

Thanks and prompt response will be highly appreicated.

[pspzockerscene]

Try this:
https://support.jdownloader.org/Know...r-installation

Explanation on how to find your JD installation directory:
https://support.jdownloader.org/Know...tion-directory

[jj0901]

I have tried below and still can't find the installation directory. What can I do? Thanks

How to locate the JDownloader installation directory without starting JDownloader?

Under Windows, JDownloader will typically be installed here: C:\Users\yourUsername\AppData\Local\JDownloader 2.0

[pspzockerscene]

I'm sorry but I'm not a Mac user.
I always thought it would be easy to locate the files of installed apps(?)

If you can't find the files but the un-installation still works and you do not need a backup of your JD config, you might want to try to uninstall and re-install JD.

[jj0901]

My computer uses Window 10, not Mac. I have tried to uninstall JD, but failed. This is the what the Log File shows. Can you help me to uninstall?

Exception:

java.lang.RuntimeException: java.lang.NoClassDefFoundError: org/appwork/updatesys/client/ModuleProgress
at com.install4j.runtime.installer.frontend.GUIHelper.invokeOnEDT(GUIHelper.java:711)
at com.install4j.runtime.installer.config.AbstractBeanConfig.finishBatch(AbstractBeanConfig.java:51)
at com.install4j.runtime.installer.ContextImpl.registerScreens(ContextImpl.java:694)
at com.install4j.runtime.installer.controller.Controller.start(Controller.java:75)
at com.install4j.runtime.installer.Uninstaller.runInProcess(Uninstaller.java:36)
at com.install4j.runtime.installer.Uninstaller.main(Uninstaller.java:25)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:85)
at com.exe4j.runtime.WinLauncher.main(WinLauncher.java:94)
at com.install4j.runtime.launcher.WinLauncher.main(WinLauncher.java:25)
Caused by: java.lang.NoClassDefFoundError: org/appwork/updatesys/client/ModuleProgress
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetPublicMethods(Unknown Source)
at java.lang.Class.getMethods(Unknown Source)
at com.sun.beans.finder.MethodFinder$1.create(Unknown Source)
at com.sun.beans.finder.MethodFinder$1.create(Unknown Source)
at com.sun.beans.util.Cache.get(Unknown Source)
at com.sun.beans.finder.MethodFinder.findMethod(Unknown Source)
at java.beans.Statement.getMethod(Unknown Source)
at java.beans.Statement.invokeInternal(Unknown Source)
at java.beans.Statement.access$000(Unknown Source)
at java.beans.Statement$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.beans.Statement.invoke(Unknown Source)
at java.beans.Expression.getValue(Unknown Source)
at com.sun.beans.decoder.ObjectElementHandler.getValueObject(Unknown Source)
at com.sun.beans.decoder.NewElementHandler.getValueObject(Unknown Source)
at com.sun.beans.decoder.ElementHandler.getContextBean(Unknown Source)
at com.sun.beans.decoder.NewElementHandler.getContextBean(Unknown Source)
at com.sun.beans.decoder.ObjectElementHandler.getValueObject(Unknown Source)
at com.sun.beans.decoder.NewElementHandler.getValueObject(Unknown Source)
at com.sun.beans.decoder.ElementHandler.endElement(Unknown Source)
at com.sun.beans.decoder.DocumentHandler.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Un known Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(Unknown Source)
at com.sun.beans.decoder.DocumentHandler$1.run(Unknown Source)
at com.sun.beans.decoder.DocumentHandler$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at com.sun.beans.decoder.DocumentHandler.parse(Unknown Source)
at java.beans.XMLDecoder$1.run(Unknown Source)
at java.beans.XMLDecoder$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.beans.XMLDecoder.parsingComplete(Unknown Source)
at java.beans.XMLDecoder.readObject(Unknown Source)
at com.install4j.runtime.installer.config.AbstractBeanConfig$2.call(AbstractBeanConfig.java:54)
at com.install4j.runtime.installer.config.AbstractBeanConfig$2.call(AbstractBeanConfig.java:51)
at com.install4j.runtime.installer.frontend.GUIHelper$4.run(GUIHelper.java:701)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.appwork.updatesys.client.ModuleProgress
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.install4j.runtime.installer.helper.Install4jClassLoader.loadClass(Install4jClassLoader.java:78)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 61 more

System properties:

java.runtime.name=Java(TM) SE Runtime Environment
exe4j.moduleName=C:\Users\jesse\AppData\Local\JDownloader 2.0\Uninstall JDownloader.exe
exe4j.semaphoreName=Local\c:_users_jesse_appdata_local_jdownloader_2.0_uninstall_jdownloader.exe
sun.boot.library.path=c:\users\jesse\appdata\local\jdownloader 2.0\jre\bin
java.vm.version=25.162-b12
java.vm.vendor=Oracle Corporation
java.vendor.url=http://java.oracle.com/
exe4j.consoleCodepage=cp0
path.separator=;
java.vm.name=Java HotSpot(TM) Client VM
file.encoding.pkg=sun.io
user.country=TW
user.script=
sun.os.patch.level=
install4j.exeDir=C:\Users\jesse\AppData\Local\JDownloader 2.0\
java.vm.specification.name=Java Virtual Machine Specification
user.dir=C:\Users\jesse\AppData\Local
java.runtime.version=1.8.0_162-b12
java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment
java.endorsed.dirs=c:\users\jesse\appdata\local\jdownloader 2.0\jre\lib\endorsed
os.arch=x86
java.io.tmpdir=C:\Users\jesse\AppData\Local\Temp\
line.separator=

java.vm.specification.vendor=Oracle Corporation
user.variant=
exe4j.tempDir=
os.name=Windows 10
sun.jnu.encoding=MS950
javax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl
java.library.path=C:\Users\jesse\AppData\Local\JDownloader 2.0\.\.install4j;C:\Users\jesse\AppData\Local\JDownloader 2.0\.\.install4j\user;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\windows\system32;C:\windows;C:\windows\System32\Wbem;C:\windows\System 32\WindowsPowerShell\v1.0\;C:\windows\System32\OpenSSH\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPo werShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files (x86)\HP\Common\HPDestPlgIn\;C:\Program Files (x86)\HP\IdrsOCR_15.3.1129.0\;C:\Users\jesse\AppData\Local\Microsoft\WindowsApps;c:\users\jesse\appd ata\local\jdownloader 2.0\jre\bin
sun.awt.enableExtraMouseButtons=true
java.specification.name=Java Platform API Specification
java.class.version=52.0
sun.management.compiler=HotSpot Client Compiler
exe4j.isInstall4j=true
os.version=10.0
user.home=C:\Users\jesse
user.timezone=Asia/Taipei
java.awt.printerjob=sun.awt.windows.WPrinterJob
file.encoding=MS950
java.specification.version=1.8
java.class.path=C:\Users\jesse\AppData\Local\JDownloader 2.0\.install4j\i4jruntime.jar
user.name=jesse
java.vm.specification.version=1.8
sun.java.command=C:\Users\jesse\AppData\Local\JDownloader 2.0\Uninstall JDownloader.exe
java.home=c:\users\jesse\appdata\local\jdownloader 2.0\jre
sun.arch.data.model=32
exe4j.launchName=C:\Users\jesse\AppData\Local\JDownloader 2.0\Uninstall JDownloader.exe
user.language=zh
java.specification.vendor=Oracle Corporation
awt.toolkit=sun.awt.windows.WToolkit
java.vm.info=mixed mode
exe4j.unextractedPosition=0
java.version=1.8.0_162
java.ext.dirs=c:\users\jesse\appdata\local\jdownloader 2.0\jre\lib\ext;C:\WINDOWS\Sun\Java\lib\ext
sun.boot.class.path=c:\users\jesse\appdata\local\jdownloader 2.0\jre\lib\resources.jar;c:\users\jesse\appdata\local\jdownloader 2.0\jre\lib\rt.jar;c:\users\jesse\appdata\local\jdownloader 2.0\jre\lib\sunrsasign.jar;c:\users\jesse\appdata\local\jdownloader 2.0\jre\lib\jsse.jar;c:\users\jesse\appdata\local\jdownloader 2.0\jre\lib\jce.jar;c:\users\jesse\appdata\local\jdownloader 2.0\jre\lib\charsets.jar;c:\users\jesse\appdata\local\jdownloader 2.0\jre\lib\jfr.jar;c:\users\jesse\appdata\local\jdownloader 2.0\jre\classes
install4j.appDir=C:\Users\jesse\AppData\Local\JDownloader 2.0\
java.vendor=Oracle Corporation
file.separator=\
java.vendor.url.bug=**External links are only visible to Support Staff** sun.io.unicode.encoding=UnicodeLittle
sun.cpu.endian=little
install4j.systemLanguage=zh
sun.desktop=windows
sun.cpu.isalist=pentium_pro+mmx pentium_pro pentium+mmx pentium i486 i386 i86

[pspzockerscene]

Originally Posted by jj0901

My computer uses Window 10, not Mac.

Sorry I must have mixed something up.

You can try to uninstall it manually by deleting the JDownloader install directory.

[jj0901]

OK, somehow I manage to find where the JDownloader 2.0 is (and found no install directory), but can not uninstall it using the uninstall icon. So I manually deleted the folder and emptied it from the trash can.

Then I downloaded JD from the official site, and unfortunately I can not execute it (imagine how frustrated I was). Then I found another source of downloading it. It is a local site providing Mandarin version of JD. I downloaded it and it is "JDownloaderPortable" and works fine now.

What an experience and I guess I would never know what went wrong previously.

Thanks guys for helping me along the way. Really really appreciated.

[pspzockerscene]

Originally Posted by jj0901

OK, somehow I manage to find where the JDownloader 2.0 is (and found no install directory)

"where the JDownloader 2.0 is" -> That is the install directory.

Originally Posted by jj0901

Then I downloaded JD from the official site, and unfortunately I can not execute it (imagine how frustrated I was).

Which error message do you get and which installer did you try?

Originally Posted by jj0901

Then I found another source of downloading it. It is a local site providing Mandarin version of JD.

I highly advise against using JDownloader versions/installers from untrusted sources as those could contain malware.
The only official source is ours via website jdownloader.org.
If someone wants to provide additional translations for JDownloader, just contact us via support@jdownloader.org.

Originally Posted by jj0901

Thanks guys for helping me along the way. Really really appreciated.

Thanks for your feedback.