SSDM-13359: Changed Java source and target compatibility version from 1.8 to 11.

build/javaproject.gradle

@@ -29,8 +29,8 @@ configurations.all {
 //    gradleVersion = '4.10.3'
 //    distributionUrl = "https://services.gradle.org/distributions/gradle-4.10.3-bin.zip"
 //}
-sourceCompatibility='1.8'
-targetCompatibility='1.8'
+sourceCompatibility='11'
+targetCompatibility='11'
 
 sourceSets { 
     main {

lib-file-download/javaproject.gradle

@@ -23,8 +23,8 @@ task wrapper(type: Wrapper) {
     distributionUrl = "http://svnsis.ethz.ch/repos/cisd/ivy-repository/trunk/gradle/distribution/3.5/gradle-3.5-all.zip"
 }
 
-sourceCompatibility='1.8'
-targetCompatibility='1.8'
+sourceCompatibility='11'
+targetCompatibility='11'
 
 sourceSets { 
     main {