Shows that IndirectList (EclipseLink) does not respect Stream contract

gistfile1.md

EclipseLink Does Not Support Java 8 Stream

If you process a list provided by your DAO using a Stream, you'll be surprised!

List<Integer> list = new IndirectList();
list.add(1);
list.stream()
    .anyMatch(o -> o.equals(1)); // false

IndirectList is an implementation provided by EclipseLink that may be returned by your data access layer.

Version of eclipse link:

<dependency>
    <groupId>org.eclipse.persistence</groupId>
    <artifactId>eclipselink</artifactId>
    <version>2.5.0</version>
</dependency>

Other reference: https://stackoverflow.com/questions/35362581/stream-api-not-working-for-lazy-loaded-collections-in-eclipselink-glassfish

IndirectListTest.java

package com.example.demo;

import org.eclipse.persistence.indirection.IndirectList;
import org.junit.Test;

import java.util.ArrayList;
import java.util.List;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

public class IndirectListTest {

    @Test
    public void control() {
        List<Integer> list = new ArrayList<>();
        list.add(1);
        assertTrue(list.stream()
                       .anyMatch(o -> o.equals(1)));
    }

    @Test
    public void indirectList() {
        @SuppressWarnings("unchecked")
        List<Integer> list = new IndirectList();
        list.add(1);
        assertFalse(list.stream()
                        .anyMatch(o -> o.equals(1)));
    }

}