Possible Cause of java.lang.VerifyError

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Possible Cause of java.lang.VerifyError

Today I encountered a "Force Close" dialog while improving my "Memory Watch" Android app. The error message shown in "Dalvik Debug Monitor" says, "java.lang.VerifyError: cynosurex.lang.EnhancedBoolean". And that was it. That was quite vague. EnhancedBoolean class came out of the "CI Class Package" and it a fairly simple class.

After a bit of code reading, it occurred to me that EnhancedBoolean class calls upon EnhancedInteger class. I had forgotten to include EnhancedInteger class in the Android app package.

Once I have included EnhancedInteger in the package, the "Memory Watcher" app ran without any problems.

Chieh Cheng
Mon, 02 Aug 2010 23:16:43 +0000

Found another case of java.lang.VerifyError today. I found this problem on Android 1.5 (API Level 3). If you call an non-existing method, it throws a java.lang.VerifyError. In my example, I called ActivityManager.getMemoryClass ().

On Android 2.1 (API Level 7), java.lang.NoSuchMethodError would be thrown--for example, call Display.getRotation ()--which seems to make more sense.

Unfortunately, unlike the java.lang.NoSuchMethodError, the java.lang.VerifyError is non-catchable at run-time. At this time, I found no way around this problem. Looks like Android 1.5 verifies all the methods prior to letting your software run.

Chieh Cheng
Thu, 12 Aug 2010 23:09:16 +0000

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