Use JdkDynamicAopProxy class loader instead of JDK bootstrap/platform loader

Closes gh-30115

Author: jhoeller

spring-aop/src/main/java/org/springframework/aop/framework/JdkDynamicAopProxy.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -120,6 +120,11 @@ public Object getProxy(@Nullable ClassLoader classLoader) {
 		if (logger.isTraceEnabled()) {
 			logger.trace("Creating JDK dynamic proxy: " + this.advised.getTargetSource());
 		}
+		if (classLoader == null || classLoader.getParent() == null) {
+			// JDK bootstrap loader or platform loader suggested ->
+			// use higher-level loader which can see Spring infrastructure classes
+			classLoader = getClass().getClassLoader();
+		}
 		return Proxy.newProxyInstance(classLoader, this.proxiedInterfaces, this);
 	}
 

spring-aop/src/test/java/org/springframework/aop/framework/ProxyFactoryTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,7 +16,10 @@
 
 package org.springframework.aop.framework;
 
+import java.sql.SQLException;
+import java.sql.Savepoint;
 import java.util.ArrayList;
+import java.util.Date;
 import java.util.List;
 
 import javax.accessibility.Accessible;
@@ -380,6 +383,40 @@ public void testInterceptorWithoutJoinpoint() {
 		assertThat(proxy.getName()).isEqualTo("tb");
 	}
 
+	@Test
+	public void testCharSequenceProxy() {
+		CharSequence target = "test";
+		ProxyFactory pf = new ProxyFactory(target);
+		ClassLoader cl = target.getClass().getClassLoader();
+		assertThat(((CharSequence) pf.getProxy(cl)).toString()).isEqualTo(target);
+	}
+
+	@Test
+	public void testDateProxy() {
+		Date target = new Date();
+		ProxyFactory pf = new ProxyFactory(target);
+		pf.setProxyTargetClass(true);
+		ClassLoader cl = target.getClass().getClassLoader();
+		assertThat(((Date) pf.getProxy(cl)).getTime()).isEqualTo(target.getTime());
+	}
+
+	@Test
+	public void testJdbcSavepointProxy() throws SQLException {
+		Savepoint target = new Savepoint() {
+			@Override
+			public int getSavepointId() throws SQLException {
+				return 1;
+			}
+			@Override
+			public String getSavepointName() throws SQLException {
+				return "sp";
+			}
+		};
+		ProxyFactory pf = new ProxyFactory(target);
+		ClassLoader cl = Savepoint.class.getClassLoader();
+		assertThat(((Savepoint) pf.getProxy(cl)).getSavepointName()).isEqualTo("sp");
+	}
+
 
 	@Order(2)
 	public static class A implements Runnable {
@@ -391,7 +428,7 @@ public void run() {
 
 
 	@Order(1)
-	public static class B implements Runnable{
+	public static class B implements Runnable {
 
 		@Override
 		public void run() {