杰克逊与几何的JSON视图

Question

我正在使用PostgreSQL DB + PostGIS上的Spring + Hibernate，它具有Geometry，它对数据库执行CRUD操作并使用Jackson JSON视图返回JSON输出。它工作正常，直到我加入Geometry。当我检查对象时，搜索返回正确的输出，但是在创建具有Geometry的结果的JSON表示时似乎存在问题。我得到这样的东西：

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议吗？

Answer 1

我有以下错误，这是其他后续错误隐藏：

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"]) 

之所以看起来像我们在WebLogic环境使用杰克逊库（我们用的是不同的一个Tomcat中正在工作罚款），它无法处理几何属性。

我们得到了在实体工作增加@JsonIgnore既财产申报和消气：

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

我可以看到这个问题的其他更复杂的方法，但我没有尝试自己：

Geometry from vividsolutions JTS fails when creating JSON