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From Shaun Lim <shaunthegr...@gmail.com>
Subject Re: Struts2 REST plugin: Passing array in JSON
Date Thu, 11 Oct 2012 18:54:56 GMT
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=arrayListStr type interface java.util.List


On Thu, Oct 11, 2012 at 11:19 AM, Chris Pratt <thechrispratt@gmail.com>wrote:

> What's the output of the run with this class & JSON?
>   (*Chris*)
>
> On Thu, Oct 11, 2012 at 10:52 AM, Shaun Lim <shaunthegreat@gmail.com>
> wrote:
>
> > Hi Chris,
> >
> > I did start off with a List<String> implementation but started changing
> > stuff around in futile attempts to get something working. Anyway I tried
> > your suggestion, and am still getting the same error:
> >
> > //I've a whole bunch of different fields here cause i was testing various
> > things, but "arrayListStr" follows your recommendation
> >
> > public class Test {
> >     private String name;
> >     private String description;
> >     private List countries;
> >
> >     private String[] array;
> >
> >     private TestChild testChild;
> >     private ArrayList arrayList;
> >     private List<String> arrayListStr;
> >
> >     public Test() {
> >         arrayList = new ArrayList();
> >         arrayListStr = new ArrayList<String>();
> >     }
> >
> >     public String getName() {
> >         return name;
> >     }
> >
> >     public void setName(String name) {
> >         System.out.println("setting name");
> >         this.name = name;
> >     }
> >
> >     public String getDescription() {
> >         System.out.println("getting desc");
> >         return description;
> >     }
> >
> >     public void setDescription(String description) {
> >         System.out.println("settings description");
> >         this.description = description;
> >     }
> >
> >     public List getCountries() {
> >         return countries;
> >     }
> >
> >     public void setCountries(List countries) {
> >         System.out.println("settings countries");
> >         this.countries = countries;
> >     }
> >
> >     public TestChild getTestChild() {
> >         return testChild;
> >     }
> >
> >     public void setTestChild(TestChild testChild) {
> >         System.out.println("setting testchild");
> >         this.testChild = testChild;
> >     }
> >
> >     public String[] getArray() {
> >         return array;
> >     }
> >
> >     public void setArray(String[] array) {
> >         System.out.println("setting arr");
> >         this.array = array;
> >     }
> >
> >     public ArrayList getArrayList() {
> >         return arrayList;
> >     }
> >
> >     public void setArrayList(ArrayList arrayList) {
> >         System.out.println("setting arrlist");
> >         this.arrayList = arrayList;
> >     }
> >
> >     public List<String> getArrayListStr() {
> >         return arrayListStr;
> >     }
> >
> >     public void setArrayListStr(List<String> arrayListStr) {
> >         System.out.println("setting arrliststr");
> >         this.arrayListStr = arrayListStr;
> >     }
> > }
> >
> > And the JSON:
> >
> > {"testChild": {"description":"kid"},"description":"whee", "name":
> > "foo","array":["CA","SG"],"arrayListStr":["CA","SG"]}
> >
> > Thanks for your help!
> >
> > Shaun
> >
> > On Wed, Oct 10, 2012 at 11:33 PM, Chris Pratt <thechrispratt@gmail.com
> > >wrote:
> >
> > > You *might* need to initialize the countries array.  I wouldn't be
> > > surprised if internally the JSON library is doing a
> > > getCountries().add("CA") and throwing a null pointer exception because
> > > getCountries is returning a null.
> > >
> > > Also, you should really be programming to interfaces, not
> > implementations.
> > > Define your methods to take and return the List<String> interface
> instead
> > > of the ArrayList<String> specific implementation and your programs will
> > be
> > > much more flexible and reusable in the future.  See if this works
> better:
> > >   (*Chris*)
> > >
> > > public class Test {
> > >     private String name;
> > >     private String description;
> > >     private List<String> countries;
> > >
> > >     public Test() {
> > >        countries = new ArrayList<>();
> > >     }
> > >
> > >     public String getName() {
> > >         return name;
> > >     }
> > >
> > >     public void setName(String name) {
> > >         this.name = name;
> > >     }
> > >
> > >     public String getDescription() {
> > >         return description;
> > >     }
> > >
> > >     public void setDescription(String description) {
> > >         this.description = description;
> > >     }
> > >
> > >     public List<String> getCountries() {
> > >         return countries;
> > >     }
> > >
> > >     public void setCountries(List<String> countries) {
> > >         this.countries = countries;
> > >     }
> > > }
> > >
> > > On Wed, Oct 10, 2012 at 11:23 PM, Shaun Lim <shaunthegreat@gmail.com>
> > > wrote:
> > >
> > > > My entity class:
> > > >
> > > > import java.util.ArrayList;
> > > >
> > > >
> > > > public class Test {
> > > >     private String name;
> > > >     private String description;
> > > >     private ArrayList<String> countries;
> > > >
> > > >     public Test() {
> > > >
> > > >     }
> > > >
> > > >     public String getName() {
> > > >         return name;
> > > >     }
> > > >
> > > >     public void setName(String name) {
> > > >         this.name = name;
> > > >     }
> > > >
> > > >     public String getDescription() {
> > > >         return description;
> > > >     }
> > > >
> > > >     public void setDescription(String description) {
> > > >         this.description = description;
> > > >     }
> > > >
> > > >     public ArrayList<String> getCountries() {
> > > >         return countries;
> > > >     }
> > > >
> > > >     public void setCountries(ArrayList<String> countries) {
> > > >         this.countries = countries;
> > > >     }
> > > > }
> > > >
> > > > The JSON I'm trying to send:
> > > >
> > > > {"countries": ["CA", "SG"], "description":"whee", "name": "foo"}
> > > >
> > > > The error:
> > > >
> > > > 2345447 [http-bio-8080-exec-1] 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=countries type interface java.util.List
> > > >
> > > > 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=countries type interface java.util.List
> > > > The problematic instruction:
> > > > ----------
> > > > ==> ${msgs[0][0]} [on line 76, column 25 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=countries type interface java.util.List
> > > >     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.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)
> > > >     ... 37 more
> > > >
> > > > Setting "name" and "description" without attempting to pass in
> > > "countries"
> > > > work - the values are successfully mapped.
> > > >
> > > > Using the following XML works too:
> > > >
> > > > <com.foo.bar.entity.Test>
> > > > <countries>
> > > > <string>SG</string>
> > > > </countries>
> > > > <description>testt</description>
> > > > </com.foo.bar.entity.Test>
> > > >
> > >
> >
>

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