How to convert sample in AWS Lambda from javascript to Java? -


i trying convert javascript sample:

javascript

'use strict';  exports.handler = (event, context, callback) => {         callback(null, {"speech": "hello lambda js"}); };

output hitting test button in aws lambda

{   "speech": "hello lambda js" }

now want convert in simplest way java program.

this tried:

public class sample implements requesthandler<string, string> {    @override public string handlerequest(string s, context context) {     return "{\"speech\": \"hello lambda java\"}";   } }

but hitting test button in aws lamda complains:

{   "errormessage": "an error occurred during json parsing",   "errortype": "java.lang.runtimeexception",   "stacktrace": [],   "cause": {     "errormessage": "com.fasterxml.jackson.databind.jsonmappingexception: can not deserialize instance of java.lang.string out of start_object token\n @ [source: lambdainternal.util.nativememoryasinputstream@5f375618; line: 1, column: 1]",     "errortype": "java.io.uncheckedioexception",     "stacktrace": [],     "cause": {       "errormessage": "can not deserialize instance of java.lang.string out of start_object token\n @ [source: lambdainternal.util.nativememoryasinputstream@5f375618; line: 1, column: 1]",       "errortype": "com.fasterxml.jackson.databind.jsonmappingexception",       "stacktrace": [         "com.fasterxml.jackson.databind.jsonmappingexception.from(jsonmappingexception.java:148)",         "com.fasterxml.jackson.databind.deserializationcontext.mappingexception(deserializationcontext.java:857)",         "com.fasterxml.jackson.databind.deser.std.stringdeserializer.deserialize(stringdeserializer.java:62)",         "com.fasterxml.jackson.databind.deser.std.stringdeserializer.deserialize(stringdeserializer.java:11)",         "com.fasterxml.jackson.databind.objectreader._bindandclose(objectreader.java:1511)",         "com.fasterxml.jackson.databind.objectreader.readvalue(objectreader.java:1102)"       ]     }   } }

your javascript function returning object literal, not json string. need parallel in java, return instance of class contains property named speech, getter , setter speech, , value of speech set "hello lambda java". aws take care of serializing object json response want.

more typing in java javascript. ha! punned.


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