How to execute graphql in java?

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<dependency>
    <groupId>com.graphql-java</groupId>
    <artifactId>graphql-java</artifactId>
    <version>{version}</version>
</dependency>

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import graphql.ExecutionInput;
import graphql.ExecutionResult;
import graphql.GraphQL;
import graphql.GraphQLContext;
import graphql.analysis.MaxQueryComplexityInstrumentation;
import graphql.analysis.MaxQueryDepthInstrumentation;
import graphql.language.SourceLocation;
import graphql.validation.ValidationError;

import java.util.List;

public class GraphQLExecutor {

    public static void main(String[] args) {
        // Create a GraphQL schema
        GraphQLSchema schema = GraphQLSchema.newSchema()
                .query(query -> query)
                .build();

        // Parse the incoming GraphQL query
        String query = "{ hello }";
        ExecutionInput executionInput = ExecutionInput.newExecutionInput()
                .query(query)
                .context(new Object())
                .build();

        // Execute the parsed query against the schema
        GraphQL graphQL = GraphQL.newGraphQL(schema)
                .instrumentation(new MaxQueryComplexityInstrumentation(5))
                .instrumentation(new MaxQueryDepthInstrumentation(3))
                .build();
        ExecutionResult executionResult = graphQL.execute(executionInput);

        // Handle the result
        if (!executionResult.getErrors().isEmpty()) {
            List<ValidationError> errors = executionResult.getErrors();
            for (ValidationError error : errors) {
                System.out.println("Error: " + error.getMessage());
            }
        } else {
            Object data = executionResult.getData();
            System.out.println("Result: " + data);
        }
    }
}