It seems to me that it is possible to run gRPC server on Servlet Server
sharing the same port, say 8080 (see Servlet Server section of Spring gRPC
doc https://docs.spring.io/spring-grpc/reference/server.html). Below is
part of my pom.xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.4.4</version>
<relativePath /> <!--lookup parent from repository -->
</parent>
<properties>
<java.version>17</java.version>
<grpc.version>1.70.0</grpc.version>
<protobuf-java.version>3.25.6</protobuf-java.version>
<spring-grpc.version>0.7.0</spring-grpc.version>
</properties>
<dependencies>
<dependency>
<groupId>io.grpc</groupId>
<artifactId>grpc-services</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.grpc</groupId>
<artifactId>spring-grpc-server-web-spring-boot-starter</artifactId>
</dependency>
... ... ...
Following is the console log when the app starts
toConfiguration$GrpcServletConfiguration : Registering gRPC service:
StatusQuery
toConfiguration$GrpcServletConfiguration : Registering gRPC service:
grpc.reflection.v1.ServerReflection
toConfiguration$GrpcServletConfiguration : Registering gRPC service:
grpc.health.v1.Health
... ... ...
o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is
running on port 35729
o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port 8080
(http) with context path '/web-context'
: Started QueryServiceApplication
in 23.59 seconds (process running for 25.383)
o.a.c.c.C.[.[.[/web-context] : Initializing
Spring DispatcherServlet 'dispatcherServlet'
o.s.web.servlet.DispatcherServlet : Initializing
Servlet 'dispatcherServlet'
o.s.web.servlet.DispatcherServlet : Completed
initialization in 3 ms
Then try to call grpc service by using grpcurl but get error
grpcurl -d "{\"name\":\"USA\"}" -plaintext localhost:8080
HelloWorld.SayHello
Error invoking method "HelloWorld.SayHello": failed to query for service
descriptor "HelloWorld": server does not support the reflection API
grpcurl -d "{\"name\":\"USA\"}" -plaintext localhost:8080
HelloWorld/SayHello
Error invoking method "HelloWorld/SayHello": failed to query for service
descriptor "HelloWorld": server does not support the reflection API
grpcurl -d "{\"name\":\"USA\"}" -plaintext localhost:8080
web-context/HelloWorld/SayHello
Error invoking method "web-context/HelloWorld/SayHello": failed to query
for service descriptor "web-context/HelloWorld": server does not support
the reflection API
Does anyone have some idea?
On Tuesday, November 28, 2017 at 8:05:57 PM UTC-5 [email protected] wrote:
> Hi Linesh,
> gRPC expects full control over the listening socket in the case of server
> side, and expects full control over creating and tearing down connections
> in the case of client side. This doesn't really fit into the model of a
> servlet container, which is what Tomcat is. If you really must create a
> gRPC server on the same JVM as Tomcat, you can add the normal gRPC startup
> code to whatever server start up code you already have:
>
> https://github.com/grpc/grpc-java/blob/master/examples/src/main/java/io/grpc/examples/helloworld/HelloWorldServer.java#L36
>
> Keep in mind that gRPC is not a servlet container, so it will not be able
> to run your existing Tomcat servlets.
>
>
> On Monday, November 27, 2017 at 1:24:27 AM UTC-8, Linesh Mohan wrote:
>>
>> Hello Team,
>>
>> I am trying to start to gRPC server within a tomcat deployment and facing
>> some issues. I am trying the achieve the following -
>> I have an app server deployed on tomcat and now I want to use gRPC, hence
>> I want to deploy a gRPC server on the same app server.
>>
>> Kindly help me with the above case.
>>
>> Thanks in advance.
>> Linesh
>>
>
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