PDEX error

[omerjerk]

import android.view.MotionEvent;
void mouseDragged() {
 MotionEvent me = (MotionEvent) mouseEvent.getNative();
 // code here, like me.getHistorySize() and other Android-y things
}

Whenever I open the above sketch, I get the following error :

Cannot find "android.view" library. Line 1 in tab test
java.lang.NullPointerException
    at processing.mode.java.pdex.ASTGenerator.getSuggestImports(ASTGenerator.java:3309)
    at processing.mode.java.pdex.ErrorCheckerService.updateErrorTable(ErrorCheckerService.java:982)
    at processing.mode.java.pdex.ErrorCheckerService.checkCode(ErrorCheckerService.java:534)
    at processing.mode.java.pdex.ErrorCheckerService.run(ErrorCheckerService.java:332)
    at java.lang.Thread.run(Thread.java:745)

Any idea what does it mean ?
Is there a problem with Android mode ?

[benfry]

It's probably that android.jar needs to be added to the list of library JARs so that the error checker service is aware of it. Check out the recent change I made to the main PDE so the result of getCoreLibrary() was added and could be checked against. @Manindra29 wrote the ErrorCheckerService code and can probably provide other pointers on how it should be handled.

[omerjerk]

I'm not getting it.
Where do we need to add android.jar ?
Right now, getCoreLibrary https://github.com/processing/processing-android/blob/master/src/processing/mode/android/AndroidMode.java#L89 returns null.

[Manindra29]

Were you able to find out why the classPath object is not getting
initialized (as per our discussion)? Android.jar should be added to the
classPath object's search path.
On Aug 13, 2015 5:50 AM, "Umair Khan" notifications@github.com wrote:

I'm not getting it.
Where do we need to add android.jar ?
Right now, getCoreLibrary
https://github.com/processing/processing-android/blob/master/src/processing/mode/android/AndroidMode.java#L89
returns null.

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#132 (comment)
.

[codeanticode]

@omerjerk @Manindra29 I still get "Cannot find "android.view" library. Line 1 in tab sketch_150817b", but not NPE after merging PR #134

[omerjerk]

I'm also getting this.
Even the NPE is too random. I get it some of the times and sometimes not.

[codeanticode]

see my last comment in #134

[Manindra29]

I found the cause of the NPE bug. It's because of a race condition. The classPath variable (which was null here) is initialised in ASTGenerator.loadJars(), which is called from ErrorCheckerService.prepareCompilerClasspath() in a separate thread. Due to a race condition, when a sketch is just being loaded, classPath is sometimes accessed before it has even been initialised and thus the NPE is thrown.

[Manindra29]

I can add a null check as a stopgap fix, but this probably needs a second look.

Added fix in processing/processing@cfe5187