Method not allowed error for GraphQL requests with Spring - spring

Question

I have a Java Spring web server that I want to force to use Spring's GraphQL library over GraphQL's own Java library so that I can manage the access to individual queries/mutations.
After following a guide online on how to do that, I have the following dependencies in my pom.xml:
...
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.3</version>
</parent>
...
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-graphql</artifactId>
<version>2.7.3</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.7.3</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
<version>2.7.3</version>
</dependency>
This is the simple controller I set up
#Controller
public class GraphQLController {
private MyObject obj;
public GraphQLController(MyObject obj) {
this.obj = obj;
}
#SchemaMapping
public Query query(){
return new Query(obj);
}
#SchemaMapping
public Mutation mutation(Path path){
return new Mutation(obj, path);
}
}
However, no matter the GraphQL request I am sending to the server, I always get the same response:
{
"timestamp": "2022-08-29T07:59:09.470+00:00",
"status": 405,
"error": "Method Not Allowed",
"path": "/graphql"
}
I'm pasting here the properties file just in case.
graphql.servlet.corsEnabled=false
graphql.servlet.mapping=/graphql
I also tried using
#RestController
#RequestMapping(value="/graphql", method = {RequestMethod.POST, RequestMethod.GET, RequestMethod.HEAD, RequestMethod.PUT}, path = "/graphql",
consumes = "application/json", produces = "application/json")
class GraphQLController {...
but with no success.
# Schema
type Query{
listProjects: [Project]
...
}
# Query I'm sending to localhost:8080/graphql
query {
listProjects {
name
}
}
I'm no expert of Spring and this has been bugging me for the past couple of days, can anyone help?
Many thanks!

Answer 1

As pointed out by #NilsHartmann in the comments, the problem was that I had the schema file under src/main/resources/ instead of src/main/resources/graphql.