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Serialize output to JSON in Java #64

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Merged
merged 3 commits into from
Nov 3, 2016
Merged

Serialize output to JSON in Java #64

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5e607b5
Serialize output to JSoN in Java
seiflotfy Nov 2, 2016
1c48936
catch json serialization exception
seiflotfy Nov 2, 2016
1574ccf
print out a proper error message on error during serialization
seiflotfy Nov 2, 2016
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4 changes: 2 additions & 2 deletions images/examples/java/src/main/java/example/Hello.java
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,7 @@ public ArrayList<UserInfo> myHandlerList(ArrayList<UserInfo> arrayList, Context
return arrayList;
}

public static void myHandlerPOJO(RequestClass request, Context context){
System.out.println(String.format("Hello %s %s" , request.firstName, request.lastName));
public static String myHandlerPOJO(RequestClass request, Context context){
return String.format("Hello %s %s" , request.firstName, request.lastName);
}
}
13 changes: 9 additions & 4 deletions images/java/src/main/java/io/iron/lambda/Launcher.java
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Original file line number Diff line number Diff line change
Expand Up @@ -131,6 +131,15 @@ private void runMethod(Method lambdaMethod, String payload, Class cls, String ha
if (!processed) {
System.err.println(String.format("Handler %s with simple, POJO, or IO(input/output) types not found", handlerName));
}

try {
String jsonInString = ClassTypeHelper.gson.toJson(result);
System.out.println(jsonInString);
}
catch (Exception e) {
System.out.println("{\"error\": \"" + ClassTypeHelper.gson.toJson(e.toString()) + "\"}");
System.exit(1);
}
}

private void launchMethod(String[] packageHandler, String payload) throws Exception {
Expand Down Expand Up @@ -195,10 +204,6 @@ private void launchMethod(String[] packageHandler, String payload) throws Except
});

Class returnType = matchedArray[0].getReturnType();
if (!returnType.getTypeName().equals("void")) {
System.err.println(String.format("Handler can only have 'void' return type. Found '%s'.", returnType.getTypeName()));
System.exit(1);
}
runMethod(matchedArray[0], payload, cls, handlerName);
}

Expand Down