I'm writing a RESTful service with Struts2 and the Struts2 REST plugin. Currently, my service is able to handle GET requests without issues, but I'm stuck trying to get it the "update" (PUT) request to work.
I have two possible models, a List for show() and a ClientFeature object for update(), where ClientFeature is a pojo class.
REST Controller:
public class ClientfeatureController extends ControllerParent implements ModelDriven<Object> {
private ClientFeature clientFeature = new ClientFeature();
private List<ClientFeature> clientFeatureList;
//Client ID
private String id;
public ClientfeatureController() {
super(ClientfeatureController.class);
}
@Override
public Object getModel() {
return (clientFeatureList != null ? clientFeatureList : clientFeature);
}
/**
* @return clientFeatureList through Struts2 model-driven design
*/
public HttpHeaders show() {
-logic for GET request here..-
//todo: add ETag and lastModified information for client caching purposes
return new DefaultHttpHeaders("show").disableCaching();
}
// PUT request: /clientfeature/update/<id> + JSON data
public String update() {
logger.info("client id: " + id);
logger.info("updated model test:" + clientFeature.getClientId());
return "update";
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public List<ClientFeature> getClientFeatureList() {
return clientFeatureList;
}
public void setClientFeatureList(List<ClientFeature> clientFeatureList) {
this.clientFeatureList = clientFeatureList;
}
}
ClientFeature:
public class ClientFeature {
private Long clientId;
private Feature feature;
private ArrayList<String> countries;
public ClientFeature() {
this.countries = new ArrayList<String>();
}
public Long getClientId() {
return clientId;
}
public void setClientId(Long clientId) {
this.clientId = clientId;
}
public Feature getFeature() {
return feature;
}
public void setFeature(Feature feature) {
this.feature = feature;
}
public ArrayList<String> getCountries() {
return countries;
}
public void setCountries(ArrayList<String> countries) {
this.countries = countries;
}
}
And am testing the service using the Postman extension for chrome and sending over JSON data that's something like:
{
"clientFeature": {
"feature" : {"featureId" : 999, "featureName" : "testFeature"}
"countries": ["CA","US"]
"clientId" : 001
}
}
And the error:
356572 [http-bio-8080-exec-6] WARN net.sf.json.JSONObject - Tried to assign property clientFeature:java.lang.Object to bean of class com.foo.bar.ClientFeature
I'm pretty much new to everything related, so any help will be very much appreciated.
EDIT:
Tried sending the following JSON:
{ "com.foo.entity.clientFeature" : {"clientId":10} }
And got the following full error:
1016894 [http-bio-8080-exec-3] ERROR freemarker.runtime - Method public java.lang.String org.apache.commons.lang.exception.NestableRuntimeException.getMessage(int) threw an exception when invoked on net.sf.json.JSONException: Error while setting property=com.foo.entity.clientFeature type class java.lang.Object
Method public java.lang.String org.apache.commons.lang.exception.NestableRuntimeException.getMessage(int) threw an exception when invoked on net.sf.json.JSONException: Error while setting property=com.foo.entity.clientFeature type class java.lang.Object
The problematic instruction:
----------
==> ${msg[0]} [on line 68, column 29 in org/apache/struts2/dispatcher/error.ftl]
----------
Java backtrace for programmers:
----------
freemarker.template.TemplateModelException: Method public java.lang.String org.apache.commons.lang.exception.NestableRuntimeException.getMessage(int) threw an exception when invoked on net.sf.json.JSONException: Error while setting property=com.foo.entity.clientFeature type class java.lang.Object
at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:130)
at freemarker.ext.beans.SimpleMethodModel.get(SimpleMethodModel.java:138)
at freemarker.core.DynamicKeyName.dealWithNumericalKey(DynamicKeyName.java:111)
at freemarker.core.DynamicKeyName._getAsTemplateModel(DynamicKeyName.java:90)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.Expression.getStringValue(Expression.java:93)
at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.IfBlock.accept(IfBlock.java:82)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:179)
at freemarker.core.Environment.visit(Environment.java:417)
at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.IfBlock.accept(IfBlock.java:82)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
at freemarker.template.Template.process(Template.java:237)
at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:797)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:519)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:851)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:278)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:300)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.NullPointerException
at freemarker.ext.beans.SimpleMemberModel.unwrapArguments(SimpleMemberModel.java:85)
at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:106)
... 43 more
Solved the problem by using the correct JSON syntax..
In case anyone gets stuck on something similar, in my case the correct syntax is:
{clientFeature: {"feature":{"id":3,"enabled":true,"description":"description here","type":"FEATURE_TYPE_HERE"},"countries":["SG"],"clientId":10}}