FULL PRODUCT VERSION :
java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b06)
Java HotSpot(TM) Client VM (build 1.6.0_02-b06, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
The following code compiles successfully with javac:

public class BugReport<T> {

	private T n;

	public void error() {
		BugReport<Integer> val = new BugReport<Integer>();
		val.n = 0;
		Integer.toString(val.n++);
	}

	public static void main(String[] args) {
		BugReport.class.getMethods();
	}
}

However, when run with `java BugReport', it always throws the following error:

Exception in thread "main" java.lang.VerifyError: (class: BugReport, method: error signature: ()V) Incompatible object argument for function call

This is likely due to the generics/autoboxing combination that fails in this case at the line Integer.toString(val.n++).

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile the code from the description and run it.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No error.
ACTUAL -
This error:

Exception in thread "main" java.lang.VerifyError: (class: BugReport, method: error signature: ()V) Incompatible object argument for function call

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.lang.VerifyError: (class: BugReport, method: error signature: ()V) Incompatible object argument for function call

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class BugReport<T> {

	private T n;

	public void error() {
		BugReport<Integer> val = new BugReport<Integer>();
		val.n = 0;
		Integer.toString(val.n++);
	}

	public static void main(String[] args) {
		BugReport.class.getMethods();
	}
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
val.n++ can be moved out of the method call and the call itself can be changed to Integer.toString(val.n).