diff --git a/spring-cloud-function-deployer/src/main/java/org/springframework/cloud/function/deployer/FunctionCreatorConfiguration.java b/spring-cloud-function-deployer/src/main/java/org/springframework/cloud/function/deployer/FunctionCreatorConfiguration.java
index 6645b97e4..cfd70a9aa 100644
--- a/spring-cloud-function-deployer/src/main/java/org/springframework/cloud/function/deployer/FunctionCreatorConfiguration.java
+++ b/spring-cloud-function-deployer/src/main/java/org/springframework/cloud/function/deployer/FunctionCreatorConfiguration.java
@@ -268,7 +268,8 @@ class FunctionCreatorConfiguration {
 		}
 
 		private ClassLoader getParent() {
-			ClassLoader loader = getClass().getClassLoader().getParent();
+			ClassLoader loader = getClass().getClassLoader();
+			loader = loader.getParent();
 			ClassLoader parent = loader;
 			while (loader.getParent() != null) {
 				// If launched from a fat jar with spring.factories skip this parent level
@@ -462,7 +463,8 @@ class FunctionCreatorConfiguration {
 				return super.loadClass(name, resolve);
 			}
 			catch (ClassNotFoundException e) {
-				if (name.contains(ContextRunner.class.getName())) {
+				if (name.contains(ContextRunner.class.getName())
+						|| name.contains(PostConstruct.class.getName())) {
 					// Special case for the ContextRunner. We can re-use the bytes for it,
 					// and the function jar doesn't have to include them since it is only
 					// used here.
diff --git a/spring-cloud-function-deployer/src/test/java/org/springframework/cloud/function/deployer/FunctionCreatorConfigurationTests.java b/spring-cloud-function-deployer/src/test/java/org/springframework/cloud/function/deployer/FunctionCreatorConfigurationTests.java
index e0ddb51fa..3eaabff38 100644
--- a/spring-cloud-function-deployer/src/test/java/org/springframework/cloud/function/deployer/FunctionCreatorConfigurationTests.java
+++ b/spring-cloud-function-deployer/src/test/java/org/springframework/cloud/function/deployer/FunctionCreatorConfigurationTests.java
@@ -19,6 +19,8 @@ package org.springframework.cloud.function.deployer;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
+import org.junit.Assume;
+import org.junit.BeforeClass;
 import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
@@ -26,6 +28,7 @@ import org.junit.runner.RunWith;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.system.JavaVersion;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.rule.OutputCapture;
 import org.springframework.cloud.function.context.FunctionCatalog;
@@ -79,7 +82,7 @@ public abstract class FunctionCreatorConfigurationTests {
 	@TestPropertySource(properties = {
 			"function.location=app:classpath,file:target/test-classes,file:target/test-classes/app",
 			"function.bean=myDoubler",
-			"function.main=org.springframework.cloud.function.test.FunctionApp"})
+			"function.main=org.springframework.cloud.function.test.FunctionApp" })
 	public static class SingleFunctionWithMainTests
 			extends FunctionCreatorConfigurationTests {
 
@@ -95,7 +98,7 @@ public abstract class FunctionCreatorConfigurationTests {
 	@TestPropertySource(properties = {
 			"function.location=app:classpath,file:target/test-classes,file:target/test-classes/app",
 			"function.bean=myDoubler",
-			"function.main=org.springframework.cloud.function.test.FunctionRegistrar"})
+			"function.main=org.springframework.cloud.function.test.FunctionRegistrar" })
 	public static class SingleFunctionWithRegistrarTests
 			extends FunctionCreatorConfigurationTests {
 
@@ -129,6 +132,12 @@ public abstract class FunctionCreatorConfigurationTests {
 	public static class SupplierCompositionTests
 			extends FunctionCreatorConfigurationTests {
 
+		@BeforeClass
+		public static void init() {
+			Assume.assumeTrue("Java > 8",
+					JavaVersion.getJavaVersion().isOlderThan(JavaVersion.NINE));
+		}
+
 		@Test
 		public void testSupplier() {
 			Supplier<Integer> function = catalog.lookup(Supplier.class, "function0");
@@ -151,6 +160,12 @@ public abstract class FunctionCreatorConfigurationTests {
 	public static class FunctionCompositionTests
 			extends FunctionCreatorConfigurationTests {
 
+		@BeforeClass
+		public static void init() {
+			Assume.assumeTrue("Java > 8",
+					JavaVersion.getJavaVersion().isOlderThan(JavaVersion.NINE));
+		}
+
 		@Test
 		public void testFunction() {
 			Function<Flux<Integer>, Flux<String>> function = catalog
@@ -173,6 +188,12 @@ public abstract class FunctionCreatorConfigurationTests {
 	public static class ConsumerCompositionTests
 			extends FunctionCreatorConfigurationTests {
 
+		@BeforeClass
+		public static void init() {
+			Assume.assumeTrue("Java > 8",
+					JavaVersion.getJavaVersion().isOlderThan(JavaVersion.NINE));
+		}
+
 		@Rule
 		public OutputCapture capture = new OutputCapture();
 
diff --git a/spring-cloud-function-deployer/src/test/java/org/springframework/cloud/function/deployer/SpringFunctionFluxConfigurationTests.java b/spring-cloud-function-deployer/src/test/java/org/springframework/cloud/function/deployer/SpringFunctionFluxConfigurationTests.java
index 8da1d6e25..64bc3b7dd 100644
--- a/spring-cloud-function-deployer/src/test/java/org/springframework/cloud/function/deployer/SpringFunctionFluxConfigurationTests.java
+++ b/spring-cloud-function-deployer/src/test/java/org/springframework/cloud/function/deployer/SpringFunctionFluxConfigurationTests.java
@@ -19,11 +19,13 @@ package org.springframework.cloud.function.deployer;
 import java.util.function.Function;
 
 import org.junit.After;
+import org.junit.Assume;
 import org.junit.Before;
 import org.junit.Test;
 
 import org.springframework.boot.SpringBootConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.system.JavaVersion;
 import org.springframework.cloud.function.context.FunctionCatalog;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -41,6 +43,8 @@ public class SpringFunctionFluxConfigurationTests {
 
 	@Before
 	public void run() {
+		Assume.assumeTrue("Java > 8",
+				JavaVersion.getJavaVersion().isOlderThan(JavaVersion.NINE));
 		if (bootstrap == null) {
 			bootstrap = new ApplicationBootstrap();
 			bootstrap.run(SpringFunctionFluxConfigurationTests.class,