duansheli commented on issue #396:
URL: https://github.com/apache/dubbo-samples/issues/396#issuecomment-977648529
用的配置
```
dubbo.protocol.name=tri
dubbo.protocol.serialization=hessian2
dubbo.provider.serialization=hessian2
dubbo.provider.protocol=tri
```
启动 provider 失败，报错
```
Extension instance (name: tri, class: interface
org.apache.dubbo.rpc.Protocol) couldn't be instantiated: null
Caused by: java.lang.NoClassDefFoundError:
com/google/protobuf/MessageOrBuilder
at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[na:na]
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1012)
~[na:na]
at
java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
~[na:na]
at
java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:862)
~[na:na]
at
java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:760)
~[na:na]
at
java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:681)
~[na:na]
at
java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:639)
~[na:na]
at
java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
~[na:na]
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
~[na:na]
at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[na:na]
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1012)
~[na:na]
at
java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
~[na:na]
at
java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:862)
~[na:na]
at
java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:760)
~[na:na]
at
java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:681)
~[na:na]
at
java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:639)
~[na:na]
at
java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
~[na:na]
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
~[na:na]
at grpc.health.v1.HealthDubbo.init(HealthDubbo.java:12)
~[dubbo-3.0.4.jar:3.0.4]
at grpc.health.v1.Health.<clinit>(Health.java:12)
~[dubbo-3.0.4.jar:3.0.4]
at
org.apache.dubbo.rpc.protocol.tri.service.TriBuiltinService.<init>(TriBuiltinService.java:58)
~[dubbo-3.0.4.jar:3.0.4]
at
org.apache.dubbo.rpc.protocol.tri.TripleProtocol.<init>(TripleProtocol.java:49)
~[dubbo-3.0.4.jar:3.0.4]
... 35 common frames omitted
```
protocol 设置成 dubbo
就能正常启动
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