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codenameone / CameraKitCodenameOne

A cross platform API for low level camera access
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Full demo project also throws a NullPointerException #9

Closed jsfan3 closed 4 years ago

jsfan3 commented 4 years ago

The NullPointerException thrown by the demo basic code of the ReadMe (https://github.com/codenameone/CameraKitCodenameOne/issues/8), is thrown also by the demo project https://github.com/codenameone/CameraKitCodenameOne/tree/master/CameraKitDemo:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
java.lang.NullPointerException
    at com.codename1.camerakit.impl.CameraNativeAccessImpl.getWebcam(Unknown Source)
    at com.codename1.camerakit.impl.CameraNativeAccessImpl.start(Unknown Source)
    at com.codename1.camerakit.CameraKit.start(CameraKit.java:72)
    at com.codename1.camerakit.demo.CameraKitDemo.start(CameraKitDemo.java:95)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.codename1.impl.javase.Executor$3$1.run(Executor.java:261)
    at com.codename1.ui.Display.processSerialCalls(Display.java:1303)
    at com.codename1.ui.Display.mainEDTLoop(Display.java:1097)
    at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)
    at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)
/home/francesco/NetBeansProjects/CameraKitCodenameOne-master/CameraKitDemo/nbproject/build-impl.xml:1328: The following error occurred while executing this line:
/home/francesco/NetBeansProjects/CameraKitCodenameOne-master/CameraKitDemo/nbproject/build-impl.xml:980: Java returned: 1
shannah commented 4 years ago

I have guarded against the NPE, but it doesn't explain why the lib can't find your system's camera. If you can figure out how to get the webcam lib we use on simulator working on your environment, then we can probably apply the changes in our cn1lib so that it works on your system. The library we use is https://github.com/sarxos/webcam-capture