java - Spring Repository Rest Resource - サブオブジェクトが保存されない問題

Question

Spring ブートで RESTful なインターフェースを実現しようとしましたが、問題が発生しました。

次の JSON を POST すると、サブオブジェクトが保存されていないことを示す org.hibernate.TransientObjectException 例外 (以下を参照) が発生します。

手でトレースすると、JSON はドメイン オブジェクトに正しくレンダリングされているように見えますが、save() メソッド (SimpleJpaRepository) が呼び出されると、サブオブジェクトを再帰的に再帰しようとしません。これは意図的なものですか？もしそうなら、サブオブジェクトを保存するように @RepositoryRestResource を構成する正しいアプローチは何ですか?

最小限の spring.boot アプリケーションがあり、診断に役立つ場合は喜んで提供します。

サブオブジェクト (関係) を持つ実際の例を探していますが、まだ見つかりません。spring.io の例は、私を動かすのに最適でしたが、それを拡張するのに少し行き詰まりました。

コード スニペットは次のとおりです。

---

JSON being posted:

{
  "name" : "Test Sample Group",
  "description" : null,
  "projectCode" : null,
  "creator" : "user001",
  "createdDate" : 1395130128971,
  "lastModifiedDate" : 1395130128971,
  "samples" : [ {
    "userPreferredId" : "S00012223434",
    "wtsiUID" : "99997853483845",
    "synonyms" : [ "ABC12345", "Humgen-0011232233", "1200088132734888234" ]
  }, {
    "userPreferredId" : "S000634734588",
    "wtsiUID" : "34583934085358",
    "synonyms" : [ "4875345993599934", "Humgen-004537682", "ABC674534" ]
  } ]
}

---

次のコマンドを使用して投稿されます。

curl -i -X POST -H "Content-Type:application/json" --data @postdata.txt http://localhost:8080/samplegroup/

---

スローされる例外は次のとおりです。

org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: uk.ac.sanger.mig.samplegroup.domain.Sample
    at** org.hibernate.engine.internal.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:294)
    at org.hibernate.type.EntityType.getIdentifier(EntityType.java:510)
    at org.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:165)
    at org.hibernate.persister.collection.AbstractCollectionPersister.writeElement(AbstractCollectionPersister.java:899)
    at org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:1308)
    at org.hibernate.persister.collection.OneToManyPersister.recreate(OneToManyPersister.java:184)
    at org.hibernate.action.internal.CollectionRecreateAction.execute(CollectionRecreateAction.java:67)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:453)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:345)
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:350)
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:56)
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1218)
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:421)
    at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
    at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:177)
    at org.hibernate.jpa.internal.TransactionImpl.commit(TransactionImpl.java:77)
    at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:515)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:757)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:726)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:478)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:272)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.data.jpa.repository.support.LockModeRepositoryPostProcessor$LockModePopulatingMethodIntercceptor.invoke(LockModeRepositoryPostProcessor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
    at com.sun.proxy.$Proxy67.save(Unknown Source)
    at org.springframework.data.rest.core.invoke.CrudRepositoryInvoker.invokeSave(CrudRepositoryInvoker.java:106)
    at org.springframework.data.rest.webmvc.RepositoryEntityController.createAndReturn(RepositoryEntityController.java:339)
    at org.springframework.data.rest.webmvc.RepositoryEntityController.postEntity(RepositoryEntityController.java:177)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:683)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1721)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1679)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)

---

RESTful リポジトリの定義は次のとおりです。

package uk.ac.sanger.mig.samplegroup.repository;

import java.util.List;

import org.springframework.data.repository.PagingAndSortingRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;

import uk.ac.sanger.mig.samplegroup.domain.SampleGroup;

@RepositoryRestResource(collectionResourceRel = "samplegroup", path = "samplegroup")
public interface SampleGroupRepository extends PagingAndSortingRepository<SampleGroup, Long> {

    List<SampleGroup> findByName(@Param("name") String name);
    List<SampleGroup> findByCreator(@Param("name") String name);

}

---

エンティティの定義は次のとおりです。

package uk.ac.sanger.mig.samplegroup.domain;

import java.util.Date;
import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.SequenceGenerator;


@Entity
public class SampleGroup {

    // Database primary key use only.
    @Id
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="SAMPLE_GROUP_SEQ")
    @SequenceGenerator(
            name="SAMPLE_GROUP_SEQ",
            sequenceName="SAMPLE_GROUP_SEQ",
            allocationSize=1
    )
    private Long id;

    @Column(unique=true, nullable=false)
    private String name;

    private String description;

    private String projectCode;

    private String creator;
    private Date createdDate;
    private Date lastModifiedDate;

    @OneToMany
    @JoinColumn(name="SAMPLE_FK")
    private Set<Sample> samples;

    public SampleGroup() {}

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCreator() {
        return creator;
    }

    public void setCreator(String creator) {
        this.creator = creator;
    }

    public Date getCreatedDate() {
        return createdDate;
    }

    public void setCreatedDate(Date createdDate) {
        this.createdDate = createdDate;
    }

    public Date getLastModifiedDate() {
        return lastModifiedDate;
    }

    public void setLastModifiedDate(Date lastModifiedDate) {
        this.lastModifiedDate = lastModifiedDate;
    }

    public Set<Sample> getSamples() {
        return samples;
    }

    public void setSamples(Set<Sample> samples) {
        this.samples = samples;
    }


    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getProjectCode() {
        return projectCode;
    }

    public void setProjectCode(String projectCode) {
        this.projectCode = projectCode;
    }

    @Override
    public String toString() {
        return "SampleGroup [id=" + id + ", name=" + name + ", description="
                + description + ", projectCode=" + projectCode + ", creator="
                + creator + ", createdDate=" + createdDate
                + ", lastModifiedDate=" + lastModifiedDate + ", samples="
                + samples + "]";
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        result = prime * result
                + ((projectCode == null) ? 0 : projectCode.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        SampleGroup other = (SampleGroup) obj;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        if (projectCode == null) {
            if (other.projectCode != null)
                return false;
        } else if (!projectCode.equals(other.projectCode))
            return false;
        return true;
    }
}

package uk.ac.sanger.mig.samplegroup.domain;

import java.util.Set;

import javax.persistence.Column;
import javax.persistence.ElementCollection;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;

@Entity
public class Sample {

    // Database primary key use only.
    @Id
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="SAMPLE_SEQ")
    @SequenceGenerator(
            name="SAMPLE_SEQ",
            sequenceName="SAMPLE_SEQ",
            allocationSize=1
        )
    private Long id;

    private String userPreferredId; // What the buisiness user prefers to call the sample.

    @Column(unique=true, nullable=false)
    private String wtsiUID;         // must be unique within WTSI (primary key)

    @ElementCollection
    private Set<String> synonyms;

    public Sample() {}

    public String getUserPreferredId() {
        return userPreferredId;
    }

    public void setUserPreferredId(String userPreferredId) {
        this.userPreferredId = userPreferredId;
    }

    public String getWtsiUID() {
        return wtsiUID;
    }

    public void setWtsiUID(String wtsiUID) {
        this.wtsiUID = wtsiUID;
    }

    public Set<String> getSynonyms() {
        return synonyms;
    }

    public void setSynonyms(Set<String> synonyms) {
        this.synonyms = synonyms;
    }

    @Override
    public String toString() {
        return "Sample [id=" + id + ", userPreferredId=" + userPreferredId
                + ", wtsiUID=" + wtsiUID + ", synonyms=" + synonyms + "]";
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((wtsiUID == null) ? 0 : wtsiUID.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Sample other = (Sample) obj;
        if (wtsiUID == null) {
            if (other.wtsiUID != null)
                return false;
        } else if (!wtsiUID.equals(other.wtsiUID))
            return false;
        return true;
    }
}