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Home/ Questions/Q 3487776
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Editorial Team
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Editorial Team
Asked: May 18, 20262026-05-18T11:11:26+00:00 2026-05-18T11:11:26+00:00

I upgraded to Android SDK Tools r8 today and I can’t seem to run

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I upgraded to Android SDK Tools r8 today and I can’t seem to run the draw9patch tool. I’m getting the following error:

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/jdesktop/swingworker/SwingWorker
at com.android.draw9patch.Application$1.run(Application.java:48)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:633)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.lang.ClassNotFoundException: org.jdesktop.swingworker.SwingWorker
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
... 9 more

I’m running snow leopard and have jre (or jdk?) 1.6.

Any ideas how to get this working? Thanks!

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  1. Editorial Team
    Editorial Team
    2026-05-18T11:11:26+00:00Added an answer on May 18, 2026 at 11:11 am

    I have found a solution(Ubuntu 10.10, java-6-sun). Copy swing-worker.jar into /path_to_android_sdk/tools/lib. You can find swing-worker-1.1.jar in the same directory in SDK r7 or download it from here.

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