Legacy SDK - Remove Java 7 check (#3663)

gradle/common-java.gradle

@@ -103,8 +103,6 @@ jacocoTestReport {
 }
 
 // setting this variable is highly recommended
-def java7JreDir = System.env.'JAVA_JRE_7'
-def isJava7 = JavaVersion.current().isJava7()
 def isJava7Compatible = JavaVersion.current().isJava7Compatible()
 
 if (!isJava7Compatible) {
@@ -113,26 +111,6 @@ if (!isJava7Compatible) {
         throw new GradleException("incompatible JDK version: ${JavaVersion.current()}; needs 1.7+")
     }
 }
-if (java7JreDir) {
-    def jre7libDir = fileTree(dir: "$java7JreDir/lib", include: '*.jar')
-    if (!jre7libDir.any()) {
-        throw new GradleException("Invalid JAVA_JRE_7 directory. ${jre7libDir.dir} was empty")
-    }
-
-    tasks.withType(JavaCompile) {
-        options.bootstrapClasspath = jre7libDir
-    }
-} else {
-    def msg = "IMPORTANT: Environment variable 'JAVA_JRE_7' is not defined - Install JRE 7 and set 'JAVA_JRE_7' to prevent runtime compatibility issues!"
-    if (!isJava7) {
-        if (isBuildServer || isRelease) {
-            logger.error msg
-            throw new GradleException("JAVA_JRE_7 must be set")
-        } else {
-            logger.warn msg
-        }
-    }
-}
 
 sourceSets {
     integrationTest {