TreeSet and compareTo() issue

Hi

I'm trying to use TreeSet but getting NPE on the compareTo() method when it does a find():

at com.objectdb.o.LDR.z(LDR.java:269)
at com.objectdb.o.OBC.aP(OBC.java:1058)
at com.objectdb.o.OBC.aN(OBC.java:976)
at com.objectdb.jpa.EMImpl.find(EMImpl.java:625)
... 123 more
Caused by: java.lang.NullPointerException
at java.lang.String$CaseInsensitiveComparator.compare(String.java:1192)
at java.lang.String$CaseInsensitiveComparator.compare(String.java:1186)
at com.rpm.model.DropdownValue.compareTo(DropdownValue.java:58)
at com.rpm.model.DropdownValue.compareTo(DropdownValue.java:9)
at java.util.TreeMap.compare(TreeMap.java:1290)
at java.util.TreeMap.put(TreeMap.java:538)
at java.util.TreeSet.add(TreeSet.java:255)
at objectdb.java.util.TreeSet.add(Unknown Source)
at java.util.AbstractCollection.addAll(AbstractCollection.java:344)
at java.util.TreeSet.addAll(TreeSet.java:312)
at objectdb.java.util.TreeSet.addAll(Unknown Source)
at java.util.TreeSet.<init>(TreeSet.java:160)
at objectdb.java.util.TreeSet.<init>(Unknown Source)
at objectdb.java.util.TreeSet.__odbNewInstanceWithData(Unknown Source)
at com.objectdb.o.CLT.readStrictly(CLT.java:226)
at com.objectdb.o.MUT.readAndAdjust(MUT.java:500)
at com.objectdb.o.UMR$S.C(UMR.java:1015)
at com.objectdb.o.UMR.B(UMR.java:603)
... 138 more

My compareTo() method looks like this:

@Override
public int compareTo(DropdownValue ddv) {
    return String.CASE_INSENSITIVE_ORDER.compare(dropdownValue, ddv.dropdownValue);
}

The dropdownValue's are accessed through a collection field in another class that uses eager fetch:

@OneToMany(fetch = FetchType.EAGER)
private Set<DropdownValue> dropdownValues = new TreeSet<>();

I presume the NPE is either on the 'dropdownValue' or 'ddv' variable.  Any ideas how to sort this please?

Thanks Russ

Are you sure that there are no null values in the dropdownValue field?

Are your classes enhanced?

If it is an issue with ObjectDB a simple test case the demonstrates it will help.

Sorry for delay...been working on other things.

I've put together a test case app (Maven) that shows the issue.  On the first run through, the process works ok but when you run the app a second time, you get the NPE.  Anyway, hopefully the test app is self-explanatory...I've commented where the NPE occurs.  It's probably something stupid that I'm forgetting to do!

Thanks

Russ

Thank you for the test case. Please note that cascading persist should be added to make the test valid:

    @OneToMany(fetch = FetchType.EAGER, cascade=CascadeType.PERSIST)
    private Set<DropdownValue> dropdownValues = new TreeSet<>();

Please try build 2.6.6_02 that should fix the issue.

Hi

No change I'm afraid after upgrading to 2.6.6_02.  Both the test case and my app are still throwing the same exception:

at com.objectdb.o.QRR.m(QRR.java:549)
at com.objectdb.o.QRR.f(QRR.java:212)
at com.objectdb.jpa.JpaQuery.getResultList(JpaQuery.java:719)
... 6 more
Caused by: java.lang.NullPointerException
at java.lang.String$CaseInsensitiveComparator.compare(String.java:1192)
at java.lang.String$CaseInsensitiveComparator.compare(String.java:1186)
at treesettest.DropdownValue.compareTo(DropdownValue.java:32)
at treesettest.DropdownValue.compareTo(DropdownValue.java:5)
at java.util.TreeMap.compare(TreeMap.java:1290)
at java.util.TreeMap.put(TreeMap.java:538)
at java.util.TreeSet.add(TreeSet.java:255)
at objectdb.java.util.TreeSet.add(Unknown Source)
at java.util.AbstractCollection.addAll(AbstractCollection.java:344)
at java.util.TreeSet.addAll(TreeSet.java:312)
at objectdb.java.util.TreeSet.addAll(Unknown Source)
at com.objectdb.o.TYT.extractCollection(TYT.java:103)
at com.objectdb.o.ENT.extractCollection(ENT.java:1510)
at objectdb.java.util.TreeSet.__odbBeforeAccess(Unknown Source)
at objectdb.java.util.TreeSet.size(Unknown Source)
at com.objectdb.o.CLT.writeStrictly(CLT.java:194)
at com.objectdb.o.TYW.ar(TYW.java:448)
at com.objectdb.o.TYW.au(TYW.java:499)
at com.objectdb.o.TYW.writeElement(TYW.java:321)
at com.objectdb.o.UMR$S.A(UMR.java:1003)
at com.objectdb.o.UMR.z(UMR.java:573)
... 22 more

Sorry about that. Please try build 2.6.6_03.

Thanks, that's fixed it.