Use Java 8

.travis.yml

@@ -1,7 +1,7 @@
 sudo: false
 language: java
 jdk:
-- openjdk11
+- openjdk8
 script:
 - test/run.sh
 notifications:

complete/build.gradle

@@ -6,7 +6,7 @@ plugins {
 
 group = 'com.example'
 version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '11'
+sourceCompatibility = '1.8'
 
 repositories {
 	mavenCentral()

complete/pom.xml

@@ -14,7 +14,7 @@
 	<name>messaging-stomp-websocket</name>
 	<description>Demo project for Spring Boot</description>
 	<properties>
-		<java.version>11</java.version>
+		<java.version>1.8</java.version>
 	</properties>
 	<dependencies>
 		<dependency>

initial/build.gradle

@@ -6,7 +6,7 @@ plugins {
 
 group = 'com.example'
 version = '0.0.1-SNAPSHOT'
-sourceCompatibility = '11'
+sourceCompatibility = '1.8'
 
 repositories {
 	mavenCentral()

initial/pom.xml

@@ -14,7 +14,7 @@
 	<name>messaging-stomp-websocket</name>
 	<description>Demo project for Spring Boot</description>
 	<properties>
-		<java.version>11</java.version>
+		<java.version>1.8</java.version>
 	</properties>
 	<dependencies>
 		<dependency>