Wrong results and NPE with copy operation
-----------------------------------------

                 Key: OAK-47
                 URL: https://issues.apache.org/jira/browse/OAK-47
             Project: Jackrabbit Oak
          Issue Type: Bug
          Components: mk
            Reporter: Michael Dürig


The following code either results in an NPE or in a wrong result depending on 
which Microkernel instance is used. 

{code}
    mk.commit("", "+\"/root\":{}", mk.getHeadRevision(), "");
    mk.commit("", 
"+\"/root/N0\":{}*\"/root/N0\":\"/root/N1\"+\"/root/N0/N4\":{}",
            mk.getHeadRevision(), "");
{code}

The wrong result is 
{code}
{
    ":childNodeCount": 2,
    "N0": {
        ":childNodeCount": 1,
        "N4": {
            ":childNodeCount": 0
        }
    },
    "N1": {
        ":childNodeCount": 1,
        "N4": {
            ":childNodeCount": 0
        }
    }
}
{code}

The expected result is
{code}
{
    ":childNodeCount": 2,
    "N0": {
        ":childNodeCount": 1,
        "N4": {
            ":childNodeCount": 0
        }
    },
    "N1": {
        ":childNodeCount": 0
    }
}
{code}

simple:fs:target/temp: wrong result
fs:{homeDir}/target: NPE
http-bridge:fs:{homeDir}/target: NPE
simple: wrong result



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