关于解决module java.base does not “opens java.lang“ to unnamed module @333291e3的办法

关于解决module java.base does not “opens java.lang” to unnamed module @333291e3的办法

1.抛出异常

在使用Dubbo和Zookeeper做一个分布式项目时，抛出以下异常：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2023-07-20 17:00:42.979 ERROR 6920 --- [           main] o.s.boot.SpringApplication               : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ServiceBean:com.bjpowernode.api.service.PlatBaseInfoService:1.0': 
Instantiation of bean failed; nested exception is java.lang.ExceptionInInitializerError 

以下是抛出异常的导致因素：

Caused by: java.lang.ExceptionInInitializerError: null
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]

Caused by: java.lang.IllegalStateException: Failed to create adaptive instance: java.lang.IllegalStateException: Can't create adaptive extension interface
org.apache.dubbo.rpc.Protocol, cause: 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 @333291e3
	at org.apache.dubbo.common.extension.ExtensionLoader.getAdaptiveExtension(ExtensionLoader.java:486) ~[dubbo-2.7.3.jar:2.7.3]
	at org.apache.dubbo.config.ServiceConfig.<clinit>(ServiceConfig.java:119) ~[dubbo-2.7.3.jar:2.7.3]
	... 24 common frames omitted

还有2个Caused by，就不列举了。

2.异常原因

导致这个异常发生的原因是使用了JDK17，

3.解决办法

方案一：将JDK版本改为1.8即可！！！

方案二：如果使用JDK17，可以在vm options 增加以下运行参数 。

–add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.lang.reflect=ALL-UNNAMED

找到 vm options选项的步骤：

在vm options选项中填入：
–add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.lang.reflect=ALL-UNNAMED

本人尝试过了，这种方法会抛出新的异常，待解决。（可能是vm options的参数不对）