[Demonstration 1]

[Buggy Method]
@Override
public ItemStack decrStackSize(int slot, int amount) {
    ItemStack stack = getStackInSlot(slot);
    if (stack != null && amount != 0) {
        if (stack.stackSize <= amount) {
            setInventorySlotContents(slot, null);
        } else {
            stack = stack.splitStack(amount);
            setInventorySlotContents(slot, getStackInSlot(slot));
        }
        markDirty();
        return stack;
    }
    return null;
}

[Buggy Hunk]
if (stack != null && amount != 0)

[Patch]
if (stack != null && amount > 0)

[Demonstration 2]

[Buggy Method]
@Override
public void timeRegulationEnabled(LogicalTime time) throws FederateInternalError {
    initClock((DateLogicalTime) time);
    sendInformInteraction("timeRegulationEnabled");
}

[Buggy Hunk]
sendInformInteraction("timeRegulationEnabled");

[Patch]
System.out.println("timeRegulationEnabled");

[Demonstration 3]

[Buggy Method]
public void writeEnum(Enum<?> enumeration) throws IOException {
    writeUnsignedNumber(enumValue(enumeration));
}

[Buggy Hunk]
public void writeEnum(Enum<?> enumeration) throws IOException {

[Patch]
public void writeEnum(@Nullable Enum<?> enumeration) throws IOException {