Java8 Collections.sort (sometimes) does not sort JPA returned lists

Question

Java8 keeps doing strange things in my JPA EclipseLink 2.5.2 environment. I had to delete the question https://stackoverflow.com/questions/26806183/java-8-sorting-behaviour

Answer 1

Wait for the bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=446236 to be fixed. Use the below dependency when it get's available or a snapshot.

  org.eclipse.persistence
  eclipselink
  2.6.0

Until then use the workaround from the question:

if (docs instanceof IndirectList) {
    IndirectList iList = (IndirectList)docs;
    Object sortTargetObject = iList.getDelegateObject();
    if (sortTargetObject instanceof List) {
        List sortTarget=(List) sortTargetObject;
        Collections.sort(sortTarget,comparator);
    }
} else {
    Collections.sort(docs,comparator);
}

or specify eager fetching where possible:

// http://stackoverflow.com/questions/8301820/onetomany-relationship-is-not-working
@OneToMany(cascade = CascadeType.ALL, mappedBy = "parentFolder", fetch=FetchType.EAGER)