#1605 - RuntimeException: Nothing in batch? ... when lazy loading on partially populated L2 bean cache

src/test/java/org/tests/cache/personinfo/PersonCacheEmail.java

@@ -0,0 +1,49 @@
+package org.tests.cache.personinfo;
+
+import io.ebean.annotation.Cache;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.ManyToOne;
+
+@Entity
+@Cache
+public class PersonCacheEmail {
+
+  @Id
+  private String id;
+
+  @ManyToOne
+  private PersonCacheInfo personInfo;
+
+  private String email;
+
+  public PersonCacheEmail(String id, String email) {
+    this.id = id;
+    this.email = email;
+  }
+
+  public String getId() {
+    return id;
+  }
+
+  public void setId(String id) {
+    this.id = id;
+  }
+
+  public PersonCacheInfo getPersonInfo() {
+    return personInfo;
+  }
+
+  public void setPersonInfo(PersonCacheInfo personInfo) {
+    this.personInfo = personInfo;
+  }
+
+  public String getEmail() {
+    return email;
+  }
+
+  public void setEmail(String email) {
+    this.email = email;
+  }
+}

src/test/java/org/tests/cache/personinfo/PersonCacheInfo.java

@@ -0,0 +1,37 @@
+package org.tests.cache.personinfo;
+
+import io.ebean.annotation.Cache;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+
+@Entity
+@Cache
+public class PersonCacheInfo {
+
+  @Id
+  private String personId;
+
+  private String name;
+
+  public PersonCacheInfo(String personId, String name) {
+    this.personId = personId;
+    this.name = name;
+  }
+
+  public String getPersonId() {
+    return personId;
+  }
+
+  public void setPersonId(String personId) {
+    this.personId = personId;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+}

src/test/java/org/tests/cache/personinfo/PersonCacheTests.java

@@ -0,0 +1,89 @@
+package org.tests.cache.personinfo;
+
+import io.ebean.Ebean;
+import io.ebean.cache.ServerCache;
+import org.ebeantest.LoggedSqlCollector;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class PersonCacheTests {
+
+  private void insert(int id, String email) {
+
+    PersonCacheInfo person = new PersonCacheInfo("P00" + id, "P00" + id);
+
+    PersonCacheEmail personEmail = new PersonCacheEmail("E00" + id, email);
+    personEmail.setPersonInfo(person);
+
+    Ebean.save(person);
+    Ebean.save(personEmail);
+  }
+
+  private void addTestData() {
+
+    insert(1, "testA");
+    insert(2, "testB");
+    insert(3, "testC");
+  }
+
+  @Test
+  public void testInQuery() {
+
+    addTestData();
+
+    LoggedSqlCollector.start();
+
+    Ebean.find(PersonCacheInfo.class)
+      .select("personId") // do not fetch name
+      .setUseCache(true)
+      .findList();
+
+    ServerCache beanCache = Ebean.getDefaultServer().getServerCacheManager().getBeanCache(PersonCacheInfo.class);
+    beanCache.getStatistics(true);
+
+    List<Object> ids = Arrays.asList(new String[]{"E001", "E002", "E003"});
+
+    List<PersonCacheEmail> emailList =
+      Ebean.find(PersonCacheEmail.class)
+        .where().idIn(ids)
+        .setUseCache(true)
+        .findList();
+
+
+    for (PersonCacheEmail email : emailList) {
+      // get property that isn't in the cached data
+      assertThat(email.getPersonInfo().getName()).isNotNull();
+      System.out.println(email.getPersonInfo().getName());
+    }
+
+    List<String> sql = LoggedSqlCollector.current();
+    assertThat(sql).hasSize(3);
+
+    assertThat(beanCache.getStatistics(true).getHitCount()).isEqualTo(3);
+
+    System.out.println("Fetch again ...");
+
+    emailList =
+      Ebean.find(PersonCacheEmail.class)
+        .where().idIn(ids)
+        .setUseCache(true)
+        .findList();
+
+
+    for (PersonCacheEmail email : emailList) {
+      // get property but it is in the cache data now
+      System.out.println(email.getPersonInfo().getName());
+      assertThat(email.getPersonInfo().getName()).isNotNull();
+    }
+
+    sql = LoggedSqlCollector.stop();
+    assertThat(sql).hasSize(1);
+
+    assertThat(beanCache.getStatistics(true).getHitCount()).isEqualTo(3);
+
+  }
+}