java.lang.IllegalArgumentException: Invalid format Exception when using org.joda.time.DateTime

Description

After getting below mentioned response from the API using the swagger-codegen generated JAR file.The GSON library is generating below mentioned Exception.

API Response for reference:
[
{
"SampleTime": "2018-09-25T22:25:07.036+00:00"
},
{
"SampleTime": "2018-09-26T02:44:20+00:00"
},
{
"SampleTime": "2018-09-26T16:20:57.289+00:00"
}
]

Exception for reference:
java.lang.IllegalArgumentException: Invalid format: "2018-09-26T02:44:20+00:00" is malformed at "+00:00"
org.joda.time.format.DateTimeFormatter.parseDateTime(DateTimeFormatter.java:945)
com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:129)
com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:220)
com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:41)
com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:82)
com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
com.google.gson.Gson.fromJson(Gson.java:888)
com.google.gson.Gson.fromJson(Gson.java:853)
com.google.gson.Gson.fromJson(Gson.java:802)
io.grpc.stub.ServerCalls$UnaryServerCallHandler$UnaryServerCallListener.onHalfClose(ServerCalls.java:171)
io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.halfClosed(ServerCallImpl.java:283)
io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1HalfClosed.runInContext(ServerImpl.java:707)
io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
java.lang.Thread.run(Thread.java:748)

Swagger-codegen version

swagger-codegen-cli-2.2.1.jar

Swagger declaration file content or url

Command line used for generation

java.exe -jar swagger-codegen-cli-2.2.1.jar generate -i swagger.json -l java -o C:\Jar --import-mappings Object=java.lang.Object

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

Start with the swagger-codegen-cli-2.2.1.jar generation command and the reported Gson parsing stack trace, using the two SampleTime values as the reproduction input. Check how the generated Java client handles these timestamps; done means both response formats can be parsed without the reported IllegalArgumentException.