GeoApiContext should clean up working threads on exit.

从堆栈跟踪中提到的 com.google.maps.GeoApiContext、com.google.maps.OkHttpRequestHandler 和 com.google.maps.internal.RateLimitExecutorService 开始；跟踪 PlacesApi.placeAutocomplete 路径如何创建并管理其工作线程。重现报告中的请求生命周期，并验证 context 可以退出而不会留下 native 线程。

Hello guys, I had a problem while doing a PlacesApi.placeAutocomplete request
I really don't know if that is a issue caused by the API or on our implementation.

We are developing an application that uses:

• Spring Boot 1.3.6.RELEASE
• Undertow
• com.google.maps:google-maps-services:0.1.17

# application.properties
server.undertow.worker-threads=1000
server.undertow.io-threads=100

# EC2 AWS
m4.xlarge

# Dockerfile

FROM java:8
RUN apt-get update && apt-get install -y

WORKDIR /app
VOLUME /root/.gradle

COPY gradle/ /app/gradle/
COPY gradlew /app/gradlew
COPY build.gradle /app/build.gradle
COPY src/ /app/src/

COPY docker-entrypoint.sh /
ENTRYPOINT ["/docker-entrypoint.sh"]

CMD ["java","-jar","/app/build/libs/application-1.0.0.jar"]

# docker-entrypoint.sh

#!/bin/bash
set -e
./gradlew build -x test
exec "$@"

@Service
public class GoogleMapsAPIService {
    public List placeAutoComplete(String input, Double latitude, Double longitude, String language) {
        GeoApiContext context = new GeoApiContext().setApiKey(GOOGLEMAPS_KEY);
        LatLng location = new LatLng(latitude, longitude); // -23.52488881961586,-46.67578987777233

        AutocompletePrediction[] autocompletePredictions = PlacesApi.placeAutocomplete(context, input)
            .location(location)
            .language("pt-BR")
            .radius(1000)
            .awaitIgnoreError();

        return assemblyPrediction(autocompletePredictions);
    }

    private List assemblyPrediction(AutocompletePrediction[] autoCompletePredictions) {
        List<Prediction> predictions = new ArrayList<>();

        for (AutocompletePrediction autocompletePrediction : autoCompletePredictions) {
            String placeId = autocompletePrediction.placeId;
            String title = autocompletePrediction.terms[0].value;
            String subTitle = Arrays.stream(autocompletePrediction.terms).skip(1).map(term -> term.value).collect(Collectors.joining(", "));

            predictions.add(new Prediction(placeId, title, subTitle));
        }

        return predictions;
    }
}

Sometimes we get this exception:

2017-04-19 19:11:03,290 [XNIO-3 task-914] DEBUG org.springframework.web.servlet.DispatcherServlet - Last-Modified value for [/predictions] is: -1
2017-04-19 19:11:03,290 [XNIO-3 task-914] INFO  com.application.services.GoogleMapsAPIService - GoogleMapsAPIService.placeAutoComplete
2017-04-19 19:11:03,290 [XNIO-3 task-914] DEBUG com.application.services.GoogleMapsAPIService -  > Passenger: [7459]
2017-04-19 19:11:03,291 [XNIO-3 task-914] DEBUG com.application.services.GoogleMapsAPIService -  > Input:     [Alameda santos 2081]
2017-04-19 19:11:03,291 [XNIO-3 task-914] DEBUG com.application.services.GoogleMapsAPIService -  > Latitude:  [-23.52488881961586]
2017-04-19 19:11:03,291 [XNIO-3 task-914] DEBUG com.application.services.GoogleMapsAPIService -  > Longitude: [-46.67578987777233]
2017-04-19 19:11:03,291 [XNIO-3 task-914] DEBUG com.application.services.GoogleMapsAPIService -  > Language:  [pt-BR]
2017-04-19 19:11:03,291 [XNIO-3 task-914] DEBUG com.application.services.GoogleMapsAPIService -  > Radius:    [1000]
2017-04-19 19:11:03,291 [XNIO-3 task-914] DEBUG org.springframework.web.servlet.DispatcherServlet - Could not complete request
org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.OutOfMemoryError: unable to create new native thread
        at org.springframework.web.servlet.DispatcherServlet.triggerAfterCompletionWithError(DispatcherServlet.java:1305)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:979)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:858)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
        at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
        at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:281)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)

Caused by: java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method)
        at java.lang.Thread.start(Thread.java:714)
        at com.google.maps.internal.RateLimitExecutorService.<init>(RateLimitExecutorService.java:63)
        at com.google.maps.OkHttpRequestHandler.<init>(OkHttpRequestHandler.java:49)
        at com.google.maps.GeoApiContext.<init>(GeoApiContext.java:88)
        at com.application.services.GoogleMapsAPIService.placeAutoComplete(GoogleMapsAPIService.java:175)
        at com.application.controllers.PredictionsController.predictions(PredictionsController.java:31)

Stacktrace:
stacktrace.txt

Do you know what could causes that?