spring data jpa jackson 序列化兩個父子類需要循環引用的解決辦法

@JsonIgnoreProperties 這個註解可以註解在屬性上，表示這個屬性的下某些屬性不被序列化；

 

使用方式如下：

https://stackoverflow.com/a/39573255/7922932

 

JsonIgnoreProperties
   
    /**
     * 評論的說說
     */
    @JoinColumn(name = "parent_comment_id")
    @ManyToOne
    @JsonIgnoreProperties("childComments")
    private Comment parentComment;


    /**
     * 評論的說說
     */
    @JoinColumn(name = "be_comment_id")
    @ManyToOne
    @JsonIgnoreProperties({"childComments", "beComment"})
    private Comment beComment;

 

---------------------------------------------------------------------------------------------------------------------------------

對於我來上上面的那種解決方式更好

@JsonIdentityInfo(generator=ObjectIdGenerators.IntSequenceGenerator.class, property="id")

 

 

在父子類的類上面都使用這個註解就可以讓這兩個類循環引用嗎，並且不出現循環依賴的報錯

參考

https://stackoverflow.com/questions/29177794/jackson-circular-dependencies

property爲主鍵名

不使用 

@JsonIgnore和

@JsonManagedReference

@JsonBackReference

也不會報錯了

@Entity
@JsonIdentityInfo(generator=ObjectIdGenerators.IntSequenceGenerator.class, property="talkId")
public class Talk {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer talkId;

     @OrderBy("id")
    //設置 ：級聯 保存/新建 操作 。新建 學校和學生 的時候，保存新建的學校那麼新建的學生也同時被保存
    @OneToMany(mappedBy = "talk")
    @Where(clause = "parent_comment_id is null")
    List<Comment> comments;

@Entity
@JsonIdentityInfo(generator=ObjectIdGenerators.IntSequenceGenerator.class, property="id")
public class Comment {
    //如果這個評論 有parent，就代表已經是一個子評論，就不用把他設置爲parent而是用它的parentId，他是否有parent

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    /**
     * 評論的說說
     */
    @ManyToOne
    @JoinColumn(name = "talk_id")
    Talk talk;

 

java.lang.StackOverflowError: null
    at com.sun.crypto.provider.CipherCore.init(CipherCore.java:504) ~[sunjce_provider.jar:1.8.0_171]
    at com.sun.crypto.provider.AESCipher.engineInit(AESCipher.java:346) ~[sunjce_provider.jar:1.8.0_171]
    at javax.crypto.Cipher.init(Cipher.java:1393) ~[na:1.8.0_171]
    at sun.security.ssl.CipherBox.createExplicitNonce(CipherBox.java:1039) ~[na:1.8.0_171]
    at sun.security.ssl.EngineOutputRecord.write(EngineOutputRecord.java:287) ~[na:1.8.0_171]
    at sun.security.ssl.EngineOutputRecord.write(EngineOutputRecord.java:225) ~[na:1.8.0_171]
    at sun.security.ssl.EngineWriter.writeRecord(EngineWriter.java:186) ~[na:1.8.0_171]
    at sun.security.ssl.SSLEngineImpl.writeRecord(SSLEngineImpl.java:1300) ~[na:1.8.0_171]
    at sun.security.ssl.SSLEngineImpl.writeAppRecord(SSLEngineImpl.java:1271) ~[na:1.8.0_171]
    at sun.security.ssl.SSLEngineImpl.wrap(SSLEngineImpl.java:1186) ~[na:1.8.0_171]
    at javax.net.ssl.SSLEngine.wrap(SSLEngine.java:469) ~[na:1.8.0_171]
    at org.apache.tomcat.util.net.SecureNioChannel.write(SecureNioChannel.java:669) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.tomcat.util.net.NioBlockingSelector.write(NioBlockingSelector.java:101) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.tomcat.util.net.NioSelectorPool.write(NioSelectorPool.java:157) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.doWrite(NioEndpoint.java:1267) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.tomcat.util.net.SocketWrapperBase.doWrite(SocketWrapperBase.java:670) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.tomcat.util.net.SocketWrapperBase.writeBlocking(SocketWrapperBase.java:450) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.tomcat.util.net.SocketWrapperBase.write(SocketWrapperBase.java:388) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.coyote.http11.Http11OutputBuffer$SocketOutputBuffer.doWrite(Http11OutputBuffer.java:623) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.coyote.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFilter.java:123) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.coyote.http11.Http11OutputBuffer.doWrite(Http11OutputBuffer.java:225) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.coyote.Response.doWrite(Response.java:541) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:351) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.catalina.connector.OutputBuffer.flushByteBuffer(OutputBuffer.java:815) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.catalina.connector.OutputBuffer.append(OutputBuffer.java:720) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:391) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:369) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:96) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
    at com.fasterxml.jackson.core.json.UTF8JsonGenerator._flushBuffer(UTF8JsonGenerator.java:2085) ~[jackson-core-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.core.json.UTF8JsonGenerator.writeString(UTF8JsonGenerator.java:457) ~[jackson-core-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.StringSerializer.serialize(StringSerializer.java:41) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.9.4.jar:2.9.4]
    at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.9.4.jar:2.9.4]