我将cglib作为Maven项目中的传递依赖项。尽管添加了我认为正确的--add-opens,但我无法让该库与Java16一起工作。
如何让cglib与Java16协同工作?我在github页面上提出了this issue。
最小可重现示例:
Main.java
import net.sf.cglib.proxy.Enhancer;
public class Main {
public static void main(String[] args) {
new Enhancer();
}
}使用Java 15:
javac -cp cglib-3.3.0.jar Main.java
java --add-opens java.base/java.lang=ALL-UNNAMED -cp cglib-3.3.0.jar:asm-7.1.jar:. Main
Picked up _JAVA_OPTIONS: -Duser.language=en -Duser.country=GB
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by net.sf.cglib.core.ReflectUtils$1 (file:/Users/rbain/Desktop/cglib-3.3.0.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of net.sf.cglib.core.ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release使用Java 16:
javac -cp cglib-3.3.0.jar Main.java
java --add-opens java.base/java.lang=ALL-UNNAMED -cp cglib-3.3.0.jar:asm-7.1.jar:. Main
Exception in thread "main" java.lang.ExceptionInInitializerError
at Main.main(Main.java:5)
Caused by: net.sf.cglib.core.CodeGenerationException: java.lang.reflect.InaccessibleObjectException-->Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @11739fa6
at net.sf.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:464)
at net.sf.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:339)
at net.sf.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:96)
at net.sf.cglib.core.AbstractClassGenerator$ClassLoaderData$3.apply(AbstractClassGenerator.java:94)
at net.sf.cglib.core.internal.LoadingCache$2.call(LoadingCache.java:54)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at net.sf.cglib.core.internal.LoadingCache.createEntry(LoadingCache.java:61)
at net.sf.cglib.core.internal.LoadingCache.get(LoadingCache.java:34)
at net.sf.cglib.core.AbstractClassGenerator$ClassLoaderData.get(AbstractClassGenerator.java:119)
at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:294)
at net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:221)
at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:174)
at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:153)
at net.sf.cglib.proxy.Enhancer.<clinit>(Enhancer.java:73)
... 1 more
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 @11739fa6
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
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 net.sf.cglib.core.ReflectUtils$1.run(ReflectUtils.java:61)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:554)
at net.sf.cglib.core.ReflectUtils.<clinit>(ReflectUtils.java:52)
at net.sf.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:243)
at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
at net.sf.cglib.core.AbstractClassGenerator.generate(AbstractClassGenerator.java:332)
... 13 more发布于 2021-04-08 23:02:48
从JDK版本16开始,--illegal-access选项的默认值是deny,因此对JDK类的“深度反射”失败。
您可以通过指定--illegal-access=permit来覆盖该行为,但您必须知道JEP 403: Strongly Encapsulate JDK Internals将在将来的版本中消除这种可能性,因此此选项只是一种临时解决方案。
永久的解决方案是将cglib更新为兼容版本(如果/一旦存在)。访问ClassLoader.defineClass的尝试表明,该库希望将类添加到特定的上下文中,这可以通过MethodHandles.lookup().defineClass来完成(从Java9开始)。因此,代码只需切换到添加类的新方法。
https://stackoverflow.com/questions/66974846
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