I have been trying out the below in SpringBoot test case.But I get a MappingInstantionException. The reason being Set is an interface which cannot be instantiated.
Workaround: Change Set to HashSet.
But this works in actual deployment.
Code
import lombok.Data;
import lombok.NoArgsConstructor;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.aggregation.AggregationResults;
import org.springframework.data.mongodb.core.aggregation.TypedAggregation;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.test.context.ActiveProfiles;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.util.Arrays;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import static org.assertj.core.internal.bytebuddy.matcher.ElementMatchers.is;
import static org.hamcrest.Matchers.hasSize;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.springframework.data.mongodb.core.aggregation.Aggregation.match;
import static org.springframework.data.mongodb.core.aggregation.Aggregation.newAggregation;
import static org.springframework.data.mongodb.core.aggregation.Aggregation.project;
@ActiveProfiles("test")
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class AggregationTest {
@Autowired
MongoTemplate mongoTemplate;
private void createUserWithLikesDocuments() {
mongoTemplate.insert(new UserWithLikes("u1", new Date(), "a", "b", "c"));
mongoTemplate.insert(new UserWithLikes("u2", new Date(), "a"));
mongoTemplate.insert(new UserWithLikes("u3", new Date(), "b", "c"));
mongoTemplate.insert(new UserWithLikes("u4", new Date(), "c", "d", "e"));
mongoTemplate.insert(new UserWithLikes("u5", new Date(), "a", "e", "c"));
mongoTemplate.insert(new UserWithLikes("u6", new Date()));
mongoTemplate.insert(new UserWithLikes("u7", new Date(), "a"));
mongoTemplate.insert(new UserWithLikes("u8", new Date(), "x", "e"));
mongoTemplate.insert(new UserWithLikes("u9", new Date(), "y", "d"));
}
@Test
public void sliceShouldBeAppliedCorrectly() {
createUserWithLikesDocuments();
TypedAggregation<UserWithLikes> agg = newAggregation(UserWithLikes.class, match(new Criteria()),
project().and("likes").slice(2));
AggregationResults<UserWithLikes> result = mongoTemplate.aggregate(agg, UserWithLikes.class);
assertThat(result.getMappedResults(), hasSize(9));
for (UserWithLikes user : result) {
assertTrue((user.getLikes().size() <= 2));
}
}
}
@Data
class UserWithLikes {
String id;
Date joined;
Set<String> likes = new HashSet<String>();
public UserWithLikes(String id, Date joined, String... likes) {
this.id = id;
this.joined = joined;
this.likes = new HashSet<String>(Arrays.asList(likes));
}
}
Exception
org.springframework.data.mapping.model.MappingInstantiationException: Failed to instantiate java.util.Set using constructor NO_CONSTRUCTOR with arguments
at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:67)
at org.springframework.data.convert.ClassGeneratingEntityInstantiator.createInstance(ClassGeneratingEntityInstantiator.java:86)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:274)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:253)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1384)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1331)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readProperties(MappingMongoConverter.java:336)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:298)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:253)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:202)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:198)
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:86)
at org.springframework.data.mongodb.core.MongoTemplate$ReadDocumentCallback.doWith(MongoTemplate.java:2782)
at org.springframework.data.mongodb.core.MongoTemplate$UnwrapAndReadDocumentCallback.doWith(MongoTemplate.java:2854)
at org.springframework.data.mongodb.core.MongoTemplate.returnPotentiallyMappedResults(MongoTemplate.java:1963)
at org.springframework.data.mongodb.core.MongoTemplate.aggregate(MongoTemplate.java:1939)
at org.springframework.data.mongodb.core.MongoTemplate.aggregate(MongoTemplate.java:1823)
at org.springframework.data.mongodb.core.MongoTemplate.aggregate(MongoTemplate.java:1809)
at id.ppn.report.entity.repository.AggregationTest.sliceShouldBeAppliedCorrectly(AggregationTest.java:57)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [java.util.Set]: Specified class is an interface
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:119)
at org.springframework.data.convert.ReflectionEntityInstantiator.createInstance(ReflectionEntityInstantiator.java:64)
... 48 more
Hello,
I have been trying out the below in SpringBoot test case.But I get a MappingInstantionException. The reason being Set is an interface which cannot be instantiated.
Workaround: Change Set to HashSet.
But this works in actual deployment.
Code
Exception