Uses ALPN jar until we switch to JDK 11

Fixes #2

Dockerfile

@@ -15,15 +15,20 @@ FROM openzipkin/zipkin:2.11.1
 MAINTAINER OpenZipkin "http://zipkin.io/"
 
 ENV ZIPKIN_GCP_REPO https://jcenter.bintray.com
-ENV ZIPKIN_GCP_VERSION 0.7.0
+ENV ZIPKIN_GCP_VERSION 0.7.1
 # Readback is currently not supported
 ENV QUERY_ENABLED false
+# must match JRE, in this case zipkin:2.11.1 uses 1.8.0_171
+# see https://github.com/square/okhttp/blob/master/pom.xml for example mappings
+# this and the download of alpn-boot will be removed with https://github.com/openzipkin/docker-jre-full/issues/9
+ENV ALPN_VERSION 8.1.12.v20180117
 
 RUN apk add unzip && \ 
+  curl -SL $ZIPKIN_GCP_REPO/org/mortbay/jetty/alpn/alpn-boot/$ALPN_VERSION/alpn-boot-$ALPN_VERSION.jar > alpn-boot.jar && \
   curl -SL $ZIPKIN_GCP_REPO/io/zipkin/gcp/zipkin-autoconfigure-storage-stackdriver/$ZIPKIN_GCP_VERSION/zipkin-autoconfigure-storage-stackdriver-$ZIPKIN_GCP_VERSION-module.jar > stackdriver.jar && \
   echo > .stackdriver_profile && \
   unzip stackdriver.jar -d stackdriver && \
   rm stackdriver.jar && \
   apk del unzip
 
-CMD test -n "$STORAGE_TYPE" && source .${STORAGE_TYPE}_profile; java ${JAVA_OPTS} -Dloader.path=stackdriver -Dspring.profiles.active=stackdriver -cp . org.springframework.boot.loader.PropertiesLauncher
+CMD test -n "$STORAGE_TYPE" && source .${STORAGE_TYPE}_profile; java ${JAVA_OPTS} -Dloader.path=stackdriver -Dspring.profiles.active=stackdriver -Xbootclasspath/p:alpn-boot.jar -cp . org.springframework.boot.loader.PropertiesLauncher