Termination of the given JBC could be disproven:

(0) Obligation:

JBC Problem based on JBC Program:
Manifest-Version: 1.0 Created-By: 1.6.0_26 (Sun Microsystems Inc.) Main-Class: simple/whileIncrPart/Main

package simple.whileIncrPart;

public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		WhileIncrPart.increase(args.length);

	}

}


package simple.whileIncrPart;

public class WhileIncrPart {

	public static void increase(int i) {
		while (i > 0) {
			if (i > 3) {
				i++;
			} else {
			  i--;
			}
		}
	}
}

(1) JBCNonTerm (EQUIVALENT transformation)

Reached a loop using the following run:
0:

<simple.whileIncrPart.Main.main||0: load ADDR args||args: a36|| ->
	String.serialVersionUID: -6849794470754667710L
	String.serialPersistentFields: a34
	String.CASE_INSENSITIVE_ORDER: o18
	String$CaseInsensitiveComparator.serialVersionUID: 8575799808933029326L
	RuntimeException.serialVersionUID: -7034897190745766939L
	Exception.serialVersionUID: -3387516993124229948L
	Throwable.serialVersionUID: -3042686055658047285L
	o18!: String$CaseInsensitiveComparator()
	a34([java.io.ObjectStreamField|]): length 0
	a36([java.lang.String...]): length 4

1:

<simple.whileIncrPart.Main.main||1: arraylength|| - ||a36>
	String.serialVersionUID: -6849794470754667710L
	String.serialPersistentFields: a34
	String.CASE_INSENSITIVE_ORDER: o18
	String$CaseInsensitiveComparator.serialVersionUID: 8575799808933029326L
	RuntimeException.serialVersionUID: -7034897190745766939L
	Exception.serialVersionUID: -3387516993124229948L
	Throwable.serialVersionUID: -3042686055658047285L
	o18!: String$CaseInsensitiveComparator()
	a34([java.io.ObjectStreamField|]): length 0
	a36([java.lang.String...]): length 4

2:

<simple.whileIncrPart.Main.main||2: simple.whileIncrPart.WhileIncrPart.increase(I)V|| - ||4>
	String.serialVersionUID: -6849794470754667710L
	String.serialPersistentFields: a34
	String.CASE_INSENSITIVE_ORDER: o18
	String$CaseInsensitiveComparator.serialVersionUID: 8575799808933029326L
	RuntimeException.serialVersionUID: -7034897190745766939L
	Exception.serialVersionUID: -3387516993124229948L
	Throwable.serialVersionUID: -3042686055658047285L
	o18!: String$CaseInsensitiveComparator()
	a34([java.io.ObjectStreamField|]): length 0
	a36([java.lang.String...]): length 4

3:

<simple.whileIncrPart.WhileIncrPart.increase||0: load INT i||i: 4|| ->
<simple.whileIncrPart.Main.main||2: simple.whileIncrPart.WhileIncrPart.increase|| - ||4>
	String.serialVersionUID: -6849794470754667710L
	String.serialPersistentFields: a34
	String.CASE_INSENSITIVE_ORDER: o18
	String$CaseInsensitiveComparator.serialVersionUID: 8575799808933029326L
	RuntimeException.serialVersionUID: -7034897190745766939L
	Exception.serialVersionUID: -3387516993124229948L
	Throwable.serialVersionUID: -3042686055658047285L
	o18!: String$CaseInsensitiveComparator()
	a34([java.io.ObjectStreamField|]): length 0
	a36([java.lang.String...]): length 4

In the loop head node, references [i17] were interesting.
By SMT, we could prove
((0 <= initial_i17 and 0 <= initial_i16) and (((path2_i17 = path2_i26 and path2_i26 = path2_i30 and path2_i33 = (path2_i30 + 1) and path2_i33 = res_i17 and path2_i16 = res_i16 and path2_i17 = initial_i17 and path2_i16 = initial_i16) and (path2_i26 > 0 and path2_i30 > 3)) and ((res_i17 = res_i26 and res_i26 = res_i30 and res_i33 = (res_i30 + 1)) and !(res_i26 > 0 and res_i30 > 3))))
to be UNSAT. Consequently, the loop will not terminate.

(2) NO