Does this Java example cause a memory leak?

I have a simple example. The example loads an ArrayList<Integer> from a file f containing 10000000 random integers.

doLog("Test 2");
{
    FileInputStream fis = new FileInputStream(f);
    ObjectInputStream ois = new ObjectInputStream(fis);
    List<Integer> l = (List<Integer>) ois.readObject();
    ois.close();
    fis.close();
    doLog("Test 2.1");
    //l = null; 
    doLog("Test 2.2");
}
doLog("Test 2.3");
System.gc();
doLog("Test 2.4");

When I have l = null, I get this log:

Test 2                          Used Mem = 492 KB   Total Mem = 123 MB
Test 2.1                        Used Mem = 44 MB    Total Mem = 123 MB
Test 2.2                        Used Mem = 44 MB    Total Mem = 123 MB
Test 2.3                        Used Mem = 44 MB    Total Mem = 123 MB
Test 2.4                        Used Mem = 493 KB   Total Mem = 123 MB

But when I remove it, I get this log instead.

Test 2                          Used Mem = 492 KB   Total Mem = 123 MB
Test 2.1                        Used Mem = 44 MB    Total Mem = 123 MB
Test 2.2                        Used Mem = 44 MB    Total Mem = 123 MB
Test 2.3                        Used Mem = 44 MB    Total Mem = 123 MB
Test 2.4                        Used Mem = 44 MB    Total Mem = 123 MB

Used Memory is calculated by: runTime.totalMemory() - runTime.freeMemory()

Question: In case where l = null; is present, is there a memory leak? l is inaccessible, so why can't it be freed?