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POUsing proguard with GSON and RoboGuice fails when using a EnumTypeAdapter
 

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  1. POUsing proguard with GSON and RoboGuice fails when using a EnumTypeAdapter
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    <p>When trying to use a EnumTypeAdapter with Proguard, it results in a AssertionError in Gson.getAdapter(). This error seems to be due to type information being lost... below is all the relevant source code:</p> <p>The Exception:</p> <pre><code>03-18 13:27:12.905: ERROR/roboguice(12139): Throwable caught during background processing java.lang.AssertionError at com.google.gson.internal.bind.TypeAdapters$EnumTypeAdapter.&lt;init&gt;(Unknown Source) at com.google.gson.internal.bind.TypeAdapters$24.create(Unknown Source) at com.google.gson.Gson.getAdapter(Unknown Source) </code></pre> <p>The EnumTypeAdapter being used:</p> <pre><code>public class OperationResultSerializer implements JsonDeserializer&lt;OperationResult&gt;, JsonSerializer&lt;OperationResult&gt; { @Override public OperationResult deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException { int value = json.getAsJsonPrimitive().getAsInt(); return OperationResult.values()[value]; } @Override public JsonElement serialize(OperationResult src, Type typeOfSrc, JsonSerializationContext context) { return new JsonPrimitive(src.ordinal()); } } </code></pre> <p>How I am constructing my GSON object: </p> <pre><code> gson = new GsonBuilder() .registerTypeAdapter(Calendar.class, new WcfCalendarSerializer()) .registerTypeAdapter(OperationResult.class, new OperationResultSerializer()) .registerTypeAdapter(FieldName.class, new FieldNameSerializer()) .registerTypeAdapter(MealType.class, new MealTypeSerializer()) .create(); </code></pre> <p>My ProGuard Config: </p> <pre><code>#-dontusemixedcaseclassnames: Necessary when building on windows where x.class and X.class is the same file -dontusemixedcaseclassnames -keepattributes *Annotation* -keepattributes Signature # Preserve the special static methods that are required in all enumeration classes. -keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String); } -keep public class * extends android.app.Application -keep public class * extends android.app.Activity -keep public class * extends android.app.Service -keep public class * extends android.content.BroadcastReceiver -keep public class * extends android.content.ContentProvider -keep class * extends android.view.View { public &lt;init&gt;(android.content.Context); public &lt;init&gt;(android.content.Context, android.util.AttributeSet); public &lt;init&gt;(android.content.Context, android.util.AttributeSet, int); public void set*(...); } -keep class com.google.inject.** { *; } -keep class javax.inject.** { *; } -keep class javax.annotation.** { *; } -keep class roboguice.** { *; } -keep class * extends android.preference.Preference { public &lt;init&gt;(android.content.Context); public &lt;init&gt;(android.content.Context, android.util.AttributeSet); public &lt;init&gt;(android.content.Context, android.util.AttributeSet, int); public void set*(...); } # Gson specific classes -keep class sun.misc.Unsafe { *; } #-keep class com.google.gson.stream.** { *; } ###Action bar sherlock -keep class android.support.v4.app.** { *; } -keep interface android.support.v4.app.** { *; } -keep class com.actionbarsherlock.** { *; } -keep interface com.actionbarsherlock.** { *; } ###RoboGuice -keepclassmembers class * { @com.google.inject.Inject &lt;init&gt;(...); } -keepclassmembers class * { void *(**On*Event); } -keep public class roboguice.** -keep class com.google.inject.** -keep class com.google.gson.** {*;} #datacontract -keep public class com.ordering.datacontract.* -keepclassmembers class com.ordering.datacontract.* # LVL License binder class -keep class com.android.vending.licensing.ILicensingService -dontwarn -ignorewarnings </code></pre> <p>As stated earlier, I suspect something is failing due to type information being lost - after digging into the GSON source code, this is the code that is called to resolve the EnumTypeAdapter... clearly the getEnumConstants is returning a Name that does not exist as a field of the type classOfT. But I am unsure how that is possible. </p> <pre><code>private static final class EnumTypeAdapter&lt;T extends Enum&lt;T&gt;&gt; extends TypeAdapter&lt;T&gt; { private final Map&lt;String, T&gt; nameToConstant = new HashMap&lt;String, T&gt;(); private final Map&lt;T, String&gt; constantToName = new HashMap&lt;T, String&gt;(); public EnumTypeAdapter(Class&lt;T&gt; classOfT) { try { for (T constant : classOfT.getEnumConstants()) { String name = constant.name(); SerializedName annotation = classOfT.getField(name).getAnnotation(SerializedName.class); if (annotation != null) { name = annotation.value(); } nameToConstant.put(name, constant); constantToName.put(constant, name); } } catch (NoSuchFieldException e) { throw new AssertionError(); } } public T read(JsonReader in) throws IOException { if (in.peek() == JsonToken.NULL) { in.nextNull(); return null; } return nameToConstant.get(in.nextString()); } public void write(JsonWriter out, T value) throws IOException { out.value(value == null ? null : constantToName.get(value)); } } </code></pre> <p>I have searched all over for possible solutions but have not found much help. Maybe someone has run into this before and can point me in the right direction? </p>
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