Support for CGLIB BeanMap utility on JDK 17

[livk-cloud]

I put the problem in MD

[livk-cloud]

SpringBoot
version: 3.0.0-SNAPSHOT
environment: Oracle JDK17 Win10 Maven-3.8.4
problem: {@org.springframework.cglib.beans.BeanMap}
example:

public class BeanMapTest {
    public static void main(String[] args) {
        var livkBean = new LivkBean(1, "1");
        var beanMap = BeanMap.create(livkBean);
        System.out.println(beanMap);
    }
}

record LivkBean(int id, String msg) {

}

Exception:

Exception in thread "main" org.springframework.cglib.core.CodeGenerationException: java.lang.reflect.InaccessibleObjectException-->Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @233c0b17
	at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525)
	at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
	at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110)
	at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108)
	at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
	at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
	at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
	at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
	at org.springframework.cglib.beans.BeanMap$Generator.create(BeanMap.java:127)
	at org.springframework.cglib.beans.BeanMap.create(BeanMap.java:59)
	at com.livk.spring.beanmap.BeanMapTest.main(BeanMapTest.java:16)
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @233c0b17
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
	at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
	at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
	at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:494)
	... 12 more

Process finished with exit code 1

JDK17 prohibits reflection of java.base package
Hope to fix it soon
problem.md

[livk-cloud]

I upgraded to 6.0.0-M1，but this problem is still not resolved

`public class BeanMapTest {
public static void main(String[] args) {
var bean = new Bean(1, "1");
var beanMap = BeanMap.create(bean);
System.out.println(beanMap);
}
}

record Bean(int n, String msg) {

}`

`Exception in thread "main" org.springframework.cglib.core.CodeGenerationException: java.lang.reflect.InaccessibleObjectException-->Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @270421f5
at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:525)
at org.springframework.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:363)
at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:110)
at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:108)
at org.springframework.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at org.springframework.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
at org.springframework.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
at org.springframework.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:134)
at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:319)
at org.springframework.cglib.beans.BeanMap$Generator.create(BeanMap.java:127)
at org.springframework.cglib.beans.BeanMap.create(BeanMap.java:59)
at BeanMapTest.main(BeanMapTest.java:14)
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @270421f5
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:494)
... 12 more

Process finished with exit code 1
`

<dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>6.0.0-M1</version> </dependency>
@spring-projects-issues

[jhoeller]

This issue seems to be pretty specifically about the BeanMap utility in CGLIB which we are not specifically supporting yet. The problem there is the lack of a contextClass on the class generator which is needed for JDK 9+ compliant class definitions. You could try the following for the time being:

BeanMap.Generator gen = new BeanMap.Generator();
gen.setBean(bean);
gen.setContextClass(bean.getClass());
BeanMap beanMap = gen.create();

We can do this out of the box in a patched version of the standard CGLIB BeanMap class. I'll adapt this issue title accordingly. However, please note that we might also decide to drop the BeanMap utility from our repackaged CGLIB fork completely.

[livk-cloud]

I found that adding the burningwave package solved the problem

github:

maven

<dependency>
            <groupId>org.burningwave</groupId>
            <artifactId>core</artifactId>
            <version>12.41.2</version>
        </dependency>

code

StaticComponentContainer.Modules.exportAllToAll();
        User user = new User();
        user.setId(0);
        user.setUsername("livk");
        user.setPassword("123456");
        @SuppressWarnings("unchecked")
        Map<String, Object> beanMap = BeanMap.create(user);
        System.out.println(beanMap);

@spring-projects-issues

Will this package be added to Spring-core?

[janeisklar]

I am unfortunately still seeing this issue with M5 and created a new ticket with a small project to reproduce the issue: #28860