异常信息：

Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class io.netty.util.internal.PlatformDependent0

Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.reflect.InaccessibleObjectException: Unable to make field long java.nio.Buffer.address accessible: module java.base does not "opens java.nio" to unnamed module @668bc3d5 [in thread "main"]

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.Field.checkCanSetAccessible(Field.java:178)

at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)

at io.netty.util.internal.PlatformDependent0$1.run(PlatformDependent0.java:69)

at java.base/java.security.AccessController.doPrivileged(AccessController.java:318)

at io.netty.util.internal.PlatformDependent0.<clinit>(PlatformDependent0.java:64)

at io.netty.util.internal.PlatformDependent.getSystemClassLoader(PlatformDependent.java:939)

at io.netty.util.internal.PlatformDependent.isAndroid0(PlatformDependent.java:956)

at io.netty.util.internal.PlatformDependent.<clinit>(PlatformDependent.java:81)

... 13 more

处理方式：

方式一：

降低jdk版本，可以使用jdk8试试

方式二：升级netty版本

可以升级到4.1.97.Final试试

<dependency>

        <groupId>io.netty</groupId>

        <artifactId>netty-all</artifactId>

        <version>4.1.97.Final</version>

</dependency>

参考：知识星球 | 深度连接铁杆粉丝，运营高品质社群，知识变现的工具