当我检查我的服务器错误日志时，我找到了
net.sf.json.JSONException: java.util.ConcurrentModificationException
at net.sf.json.JSONObject.defaultBeanProcessing(JSONObject.java:818)
at net.sf.json.JSONObject._fromBean(JSONObject.java:699)
at net.sf.json.JSONObject.fromObject(JSONObject.java:172)
at net.sf.json.JSONObject.fromObject(JSONObject.java:134)
at com.j1.mai.model.common.JsonResult.toString(JsonResult.java:126)
at com.j1.mai.model.common.JsonpBaseAction.write(JsonpBaseAction.java:84)
at com.j1.mai.model.common.JsonpBaseAction.write(JsonpBaseAction.java:65)
at com.j1.mai.action.SearchAction.list(SearchAction.java:106)
at sun.reflect.GeneratedMethodAccessor325.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:440)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:428)
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:936)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:617)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1774)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
at java.util.AbstractList$Itr.next(AbstractList.java:343)
at org.apache.commons.collections.iterators.AbstractIteratorDecorator.next(AbstractIteratorDecorator.java:67)
at org.apache.commons.collections.map.ListOrderedMap$ListOrderedIterator.next(ListOrderedMap.java:605)
at net.sf.json.JSONObject.hashCode(JSONObject.java:2114)
at java.util.HashMap.put(HashMap.java:372)
at java.util.HashSet.add(HashSet.java:200)
at net.sf.json.AbstractJSON.addInstance(AbstractJSON.java:63)
at net.sf.json.JSONObject._fromJSONObject(JSONObject.java:900)
at net.sf.json.JSONObject.fromObject(JSONObject.java:155)
at net.sf.json.JSONSerializer.toJSON(JSONSerializer.java:108)
at net.sf.json.AbstractJSON._processValue(AbstractJSON.java:238)
at net.sf.json.JSONObject._processValue(JSONObject.java:2655)
at net.sf.json.JSONObject.processValue(JSONObject.java:2721)
at net.sf.json.JSONObject.setInternal(JSONObject.java:2736)
at net.sf.json.JSONObject.setValue(JSONObject.java:1424)
at net.sf.json.JSONObject.defaultBeanProcessing(JSONObject.java:765)
... 36 more
JsonResult类
public class JsonResult implements Serializable {
static Logger LOG = Logger.getLogger(JsonResult.class);
private static final long serialVersionUID = 248463127163578297L;
private String status;
private String msg;
private JSONObject data;
public JsonResult() {
this.setSuccess();
this.data = new JSONObject();
}
public String getStatus() {
return status;
}
public JsonResult setStatus(String status) {
this.status = status;
return this;
}
public JsonResult setSuccess() {
this.status = MsgStatus.NORMAL.getCode();
return this;
}
public JsonResult setFailure() {
this.status = MsgStatus.EXCEPTION.getCode();
return this;
}
public String getMsg() {
return msg;
}
public JsonResult setMsg(String msg) {
this.msg = msg;
return this;
}
public JSONObject getData() {
return data;
}
public boolean success() {
return this.status.equals(MsgStatus.NORMAL.getCode());
}
public JsonResult setData(JSONObject data) {
this.data = data;
return this;
}
public JsonResult put(Object key, Object val) {
if (val != null)
this.data.put(key, val);
return this;
}
public JsonResult setObjData(Object o) {
if (o == null)
return this;
try {
if (o.getClass().equals(JSONObject.class)) {
this.data = (JSONObject) o;
} else {
this.data = JSONObject.fromObject(o);
}
} catch (Exception e) {
LOG.error(e.getMessage(), e);
}
return this;
}
public JsonResult putObjData(Object o) {
if (o == null)
return this;
JSONObject jo = null;
try {
if (o.getClass().equals(JSONObject.class)) {
jo = (JSONObject) o;
} else {
jo = JSONObject.fromObject(o);
}
if (jo != null)
this.data.putAll(jo);
} catch (Exception e) {
LOG.error(e.getMessage(), e);
}
return this;
}
public JsonResult clear() {
this.getData().clear();
this.setSuccess();
this.setMsg("");
return this;
}
@Override
public String toString() {
return JSONObject.fromObject(this).toString();
}
}
且JsonpBaseAction.write代码为
protected JsonResult _result = new JsonResult();
public void write(HttpServletRequest request, HttpServletResponse response,
String callback) {
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");
String result = null;
PrintWriter writer = null;
try {
writer = response.getWriter();
if (StringUtil.isEmpty(callback))
result = _result.toString();
else
result = callback + "(" + _result.toString() + ")";
} catch (Exception e) {
logger.error(e.getMessage(), e);
} finally {
if (writer != null) {
writer.write(result);
writer.close();
}
if (result != null)
_result.clear();
}
}
我认为在写作时我并没有修改JSONObject。
为什么我得到ConcurrentModificationException？
答案 0 :(得分：0)