Replace 'main' property with the 'mainClass' property in the Spring Boot 'bootRun' Gradle Task.

spring-geode-samples/boot/actuator/spring-geode-samples-boot-actuator.gradle

@@ -26,6 +26,6 @@ bootJar {
 }
 
 bootRun {
-	main = 'example.app.temp.geode.client.BootGeodeClientApplication'
+	mainClass = 'example.app.temp.geode.client.BootGeodeClientApplication'
 	args "--spring.profiles.active=client"
 }

spring-geode-samples/caching/http-session/spring-geode-samples-caching-httpsession.gradle

@@ -22,5 +22,5 @@ bootJar {
 }
 
 bootRun {
-	main = 'example.app.caching.session.http.BootGeodeHttpSessionCachingApplication'
+	mainClass = 'example.app.caching.session.http.BootGeodeHttpSessionCachingApplication'
 }

spring-geode-samples/caching/inline-async/spring-geode-samples-caching-inline-async.gradle

@@ -33,6 +33,6 @@ bootJar {
 }
 
 bootRun {
-	main = 'example.app.caching.inline.async.client.BootGeodeAsyncInlineCachingClientApplication'
+	mainClass = 'example.app.caching.inline.async.client.BootGeodeAsyncInlineCachingClientApplication'
 	args "--spring.profiles.active=peer-cache,queue-batch-size,server"
 }

spring-geode-samples/caching/inline/spring-geode-samples-caching-inline.gradle

@@ -29,5 +29,5 @@ bootJar {
 }
 
 bootRun {
-	main = 'example.app.caching.inline.BootGeodeInlineCachingApplication'
+	mainClass = 'example.app.caching.inline.BootGeodeInlineCachingApplication'
 }

spring-geode-samples/caching/look-aside/spring-geode-samples-caching-lookaside.gradle

@@ -19,5 +19,5 @@ bootJar {
 }
 
 bootRun {
-	main = 'example.app.caching.lookaside.BootGeodeLookAsideCachingApplication'
+	mainClass = 'example.app.caching.lookaside.BootGeodeLookAsideCachingApplication'
 }