傑克遜與幾何的JSON視圖

Question

我正在使用PostgreSQL DB + PostGIS上的Spring + Hibernate，它具有Geometry，它對數據庫執行CRUD操作並使用Jackson JSON視圖返回JSON輸出。它工作正常，直到我加入Geometry。當我檢查對象時，搜索返回正確的輸出，但是在創建具有Geometry的結果的JSON表示時似乎存在問題。我得到這樣的東西：

org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: This method does not support GeometryCollection arguments (through reference chain: java.util.ArrayList[0]->com.tutorial.jquery.model.State["geom"]->com.vividsolutions.jts.geom.MultiPolygon["boundary"]->com.vividsolutions.jts.geom.MultiLineString["boundary"]->com.vividsolutions.jts.geom.MultiPoint["boundary"]->com.vividsolutions.jts.geom.GeometryCollection["boundary"]); nested exception is org.codehaus.jackson.map.JsonMappingException: This method does not support GeometryCollection arguments (through reference chain: java.util.ArrayList[0]->com.tutorial.jquery.model.State["geom"]->com.vividsolutions.jts.geom.MultiPolygon["boundary"]->com.vividsolutions.jts.geom.MultiLineString["boundary"]->com.vividsolutions.jts.geom.MultiPoint["boundary"]->com.vividsolutions.jts.geom.GeometryCollection["boundary"]) 
at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.writeInternal(MappingJacksonHttpMessageConverter.java:195) 
at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179) 
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148) 
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90) 
at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:189) 
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69) 
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122) 
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:746) 
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:687) 
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925) 
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) 
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915) 
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:811) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) 
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) 
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) 
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390) 
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) 
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) 
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) 
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) 
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230) 
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114) 
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) 
at org.mortbay.jetty.Server.handle(Server.java:326) 
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) 
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) 
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547) 
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212) 
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) 
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409) 
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582) 
Caused by: org.codehaus.jackson.map.JsonMappingException: This method does not support GeometryCollection arguments (through reference chain: java.util.ArrayList[0]->com.tutorial.jquery.model.State["geom"]->com.vividsolutions.jts.geom.MultiPolygon["boundary"]->com.vividsolutions.jts.geom.MultiLineString["boundary"]->com.vividsolutions.jts.geom.MultiPoint["boundary"]->com.vividsolutions.jts.geom.GeometryCollection["boundary"]) 
at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:215) 
at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:180) 
at org.codehaus.jackson.map.ser.SerializerBase.wrapAndThrow(SerializerBase.java:128) 

任何人都可以提出一些建議嗎？

Answer 1

我有以下錯誤，這是其他後續錯誤隱藏：

org.codehaus.jackson.map.JsonMappingException: This method does not 
support GeometryCollection arguments (through reference chain: 
com.mapflow.exposure.model.wrapper.DefaultWrapper["result"]-> 
java.util.ArrayList[0]->com.mapflow.exposure.model.poi.SimplePoint["geom"]-> 
com.vividsolutions.jts.geom.Point["boundary"]-> 
com.vividsolutions.jts.geom.GeometryCollection["boundary"]) 

之所以看起來像我們在WebLogic環境使用傑克遜庫（我們用的是不同的一個Tomcat中正在工作罰款），它無法處理幾何屬性。

我們得到了在實體工作增加@JsonIgnore既財產申報和消氣：

import org.codehaus.jackson.annotate.JsonIgnore; 
@JsonIgnore 
private Geometry geom; 
(...) 
@JsonIgnore 
public Geometry getGeom() { 
    return geom; 
} 

我可以看到這個問題的其他更復雜的方法，但我沒有嘗試自己：

Geometry from vividsolutions JTS fails when creating JSON