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>
