GeneratedMessageV3#isStringEmpty(Object) method not found

[João Victor Gomides Cruz]

Hi guys I'm having an issue with protobuf java. can I get some help on where to start fixing it?

I'm getting this error 
java.lang.NoSuchMethodError: 'boolean com.google.protobuf.GeneratedMessageV3.isStringEmpty(java.lang.Object)'
        at is.warden.protocol.service.proto.ProxyRegisterRequest.getSerializedSize(ProxyRegisterRequest.java:250) ~[?:?]
        at io.grpc.protobuf.lite.ProtoInputStream.available(ProtoInputStream.java:108) ~[?:?]
        at io.grpc.internal.MessageFramer.getKnownLength(MessageFramer.java:205) ~[?:?]
        at io.grpc.internal.MessageFramer.writePayload(MessageFramer.java:137) ~[?:?]
        at io.grpc.internal.AbstractStream.writeMessage(AbstractStream.java:65) ~[?:?]
        at io.grpc.internal.ForwardingClientStream.writeMessage(ForwardingClientStream.java:37) ~[?:?]
        at io.grpc.internal.DelayedStream$6.run(DelayedStream.java:283) ~[?:?]
        at io.grpc.internal.DelayedStream.drainPendingCalls(DelayedStream.java:182) ~[?:?]
        at io.grpc.internal.DelayedStream.access$100(DelayedStream.java:44) ~[?:?]
        at io.grpc.internal.DelayedStream$4.run(DelayedStream.java:148) ~[?:?]
        at io.grpc.stub.ClientCalls$ThreadlessExecutor.waitAndDrain(ClientCalls.java:741) ~[?:?]
        at io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:149) ~[?:?]
        at is.warden.protocol.service.proto.ProxyServiceGrpc$ProxyServiceBlockingStub.register(ProxyServiceGrpc.java:475) ~[?:?]
        at is.warden.protocol.service.client.proxy.ProxyServiceClient.register(ProxyServiceClient.java:22) ~[?:?]
        at is.warden.protocolplugin.proxy.ProxyProtocolPlugin.registerProxy(ProxyProtocolPlugin.java:56) ~[?:?]
        at is.warden.protocolplugin.proxy.ProxyProtocolPlugin.onEnable(ProxyProtocolPlugin.java:29) ~[?:?]
        at net.md_5.bungee.api.plugin.PluginManager.enablePlugins(PluginManager.java:315) ~[waterfall.jar:git:Waterfall-Bootstrap:1.18-R0.1-SNAPSHOT:adabf32:474]
        at net.md_5.bungee.BungeeCord.start(BungeeCord.java:290) ~[waterfall.jar:git:Waterfall-Bootstrap:1.18-R0.1-SNAPSHOT:adabf32:474]
        at net.md_5.bungee.BungeeCordLauncher.main(BungeeCordLauncher.java:67) ~[waterfall.jar:git:Waterfall-Bootstrap:1.18-R0.1-SNAPSHOT:adabf32:474]
        at net.md_5.bungee.Bootstrap.main(Bootstrap.java:15) ~[waterfall.jar:git:Waterfall-Bootstrap:1.18-R0.1-SNAPSHOT:adabf32:474]

with this grpc dependencies
implementation("io.grpc:grpc-protobuf:1.43.2")
implementation("io.grpc:grpc-stub:1.43.2")
implementation("io.grpc:grpc-netty:1.43.2")

implementation("com.google.protobuf:protobuf-java:3.19.2")
implementation("com.google.protobuf:protobuf-java-util:3.19.2")

I even decompiled the final jar and the method does exist, I don't know where to even start looking.

Thanks in advance :)

[Adam Cozzette]

This indicates that somehow the project is using Java generated code that is too new for the protobuf runtime. GeneratedMessageV3.isStringEmpty was added relatively recently, so if the runtime library is too old then it won't be present. Version 3.19.2 is quite recent, so that should be fine, but the fact that you're getting the error anyway suggests to me that there must be an old runtime being used somewhere.

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