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POGson Exception on deserialize (no-args constructor does not exist)
 

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  1. POGson Exception on deserialize (no-args constructor does not exist)
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    <p>I've got a problem which occurs only in 10 of 5000 devices. There is no possibility to reproduce it with my emulators and test devices. It seems to be a very specific problem with only a few devices. All I've got is the stacktrace and my code. So I'm developing against a black hole and only after I released the new version at GooglePlay I see if the changes solved the problem. I just updated a new version to GooglePlay, but the error still exists. </p> <p>The changes were parameterless contructors and change the WorkIem <a href="https://stackoverflow.com/questions/5148011/android-and-gson-throwing-no-args-constructor-not-found-exception">class to static</a>.</p> <p>Here is the stacktrace:</p> <pre><code>W 6758/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x401a15a0) E 6758/AndroidRuntime: FATAL EXCEPTION: main **Caused by: java.lang.RuntimeException: No-args constructor for class com.mypackage.model.UpdaterObject$UpdateReport does not exist. Register an InstanceCreator with Gson for this type to fix this problem.** at com.google.gson.MappedObjectConstructor.constructWithNoArgConstructor(MappedObjectConstructor.java:64) at com.google.gson.MappedObjectConstructor.construct(MappedObjectConstructor.java:53) at com.google.gson.JsonObjectDeserializationVisitor.constructTarget(JsonObjectDeserializationVisitor.java:40) at com.google.gson.JsonDeserializationVisitor.getTarget(JsonDeserializationVisitor.java:56) at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:109) at com.google.gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationContextDefault.java:73) at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:51) at com.google.gson.Gson.fromJson(Gson.java:568) at com.google.gson.Gson.fromJson(Gson.java:515) at com.google.gson.Gson.fromJson(Gson.java:484) at com.google.gson.Gson.fromJson(Gson.java:434) at com.google.gson.Gson.fromJson(Gson.java:406) **at de.fliese.NewVersionCheckerActivity.onCreate(NewVersionCheckerActivity.java:35)** </code></pre> <p>This is line 35:</p> <pre><code>UpdateReport report = new Gson().fromJson(jsonStr, UpdateReport.class); </code></pre> <p>The json-String looks like this (Workitems can be null): </p> <pre><code>{"WorkItems": [{"Url":"http://url1.comfoo.zip","TypeId":1,"LastModifiedServer":1352598239000}, {"Url":"http://url2.com/bar.zip","TypeId":4,"LastModifiedServer":1352598265000}], "ShowQuestionDialog":false,"IsOffline":false,"DoUpdate":true} </code></pre> <p>And finally here is my UpdateReport class with the innerClass:</p> <pre><code>public class UpdaterObject{ public class UpdateReport { public boolean IsOffline; public boolean DoUpdate; public boolean ShowQuestionDialog; public List&lt;WorkItem&gt; WorkItems; public UpdateReport() { } public UpdateReport(boolean isoffline, boolean doUpdate, List&lt;WorkItem&gt; workitems) { IsOffline = isoffline; DoUpdate = doUpdate; WorkItems = workitems; } } public static class WorkItem { public int TypeId; public String Url; public long LastModifiedServer; public WorkItem() { } public WorkItem(int typeId, String url, long lastModifiedServer) { TypeId = typeId; Url = url; LastModifiedServer = lastModifiedServer; } } //some methods [....] } //end class UpdaterObject </code></pre> <p>I would be happy, if someone could help me. Please make sure and be sure that your answer ist absolutely correct, because I can't test it! That would be great! </p> <p>This is my first posting on StackOverFlow. Please be fair. :) </p> <p>Thanks qd0r</p>
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    1. COQuestion about TypeId: are you sure about `int` type?
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    2. COI strongly recommend to override Exception and add Device/Manufacture info, Android version ... on each Exception drop. It will help you to diagnose the issues.
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    3. COYes, TypeId is int. good idea! now I created 3 classes: WorkItem and UpdateReport for the model and the (renamed) UpdaterObject for getters which returns an UpdateReport object. All classes got a empty default constructor now. I hope that solves the problem.
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