多对一双向关联后使用org.codehaus.jackson.map.ObjectMapper转json时报org.codehaus.jackson.map.ObjectMapper;

来源：互联网发布：淘宝潮流男装店铺排行编辑：程序博客网时间：2024/05/01 13:53

严重: Exception Processing ErrorPage[exceptionType=java.lang.Throwable, location=/500.jsp]java.lang.IllegalStateExceptionat org.apache.coyote.Response.reset(Response.java:297)at org.apache.catalina.connector.Response.reset(Response.java:652)at org.apache.catalina.connector.Response.reset(Response.java:916)at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:417)at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:271)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)at java.lang.Thread.run(Thread.java:619)

双向关联后转Json，由于两边都关联，会形成死循环，在实体中加注解：

@Entity
@Table(name = "T_DL_URBANDETECTUNIT")
@JsonIgnoreProperties (value = {"urbanRoadInfo"})

/*@ManyToOne(cascade=CascadeType.ALL)@JoinColumn(name="URBANID")public UrbanRoadInfo getUrbanRoadInfo() {return urbanRoadInfo;}public void setUrbanRoadInfo(UrbanRoadInfo urbanRoadInfo) {this.urbanRoadInfo = urbanRoadInfo;}*/

即可使urbanRoadInfo不参与到json串中