basic spring mvc and spring mvc starter integration which exposes a GraphQL endpoint

graphql-java-spring-webmvc/build.gradle

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+description = "GraphQL Java Spring Webmvc integration"
+
+dependencies {
+    compile "org.springframework:spring-webmvc:$springVersion"
+    compile "org.springframework:spring-context:$springVersion"
+    compile "com.fasterxml.jackson.core:jackson-databind:$jacksonVersion"
+    compile "com.graphql-java:graphql-java:$graphqlJavaVersion"
+
+    testCompile("org.assertj:assertj-core:$assertJVersion")
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+    testCompile "org.springframework:spring-test:$springVersion"
+    testCompile group: 'javax.servlet', name: 'javax.servlet-api', version: '4.0.1'
+    testCompile group: 'com.jayway.jsonpath', name: 'json-path', version: '2.4.0'
+    testCompile "org.mockito:mockito-core:2.+"
+}

graphql-java-spring-webmvc/src/main/java/org/springframework/graphql/ExecutionInputCustomizer.java

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+package org.springframework.graphql;
+
+import graphql.ExecutionInput;
+import graphql.PublicApi;
+import org.springframework.web.context.request.WebRequest;
+
+import java.util.concurrent.CompletableFuture;
+
+/**
+ * Lets you customize the #ExecutionInput before the query is executed.
+ * You can for example set a context object or define a root value.
+ * <p>
+ * This is only used if you use the default {@link GraphQLInvocation}.
+ */
+@PublicApi
+public interface ExecutionInputCustomizer {
+
+    CompletableFuture<ExecutionInput> customizeExecutionInput(ExecutionInput executionInput, WebRequest webRequest);
+
+}

graphql-java-spring-webmvc/src/main/java/org/springframework/graphql/ExecutionResultHandler.java

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+package org.springframework.graphql;
+
+import graphql.ExecutionResult;
+import graphql.PublicSpi;
+
+import java.util.concurrent.CompletableFuture;
+
+@PublicSpi
+public interface ExecutionResultHandler {
+
+    Object handleExecutionResult(CompletableFuture<ExecutionResult> executionResultCF);
+}

graphql-java-spring-webmvc/src/main/java/org/springframework/graphql/GraphQLInvocation.java

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+package org.springframework.graphql;
+
+import graphql.ExecutionResult;
+import graphql.PublicApi;
+import org.springframework.web.context.request.WebRequest;
+
+import java.util.concurrent.CompletableFuture;
+
+@PublicApi
+public interface GraphQLInvocation {
+
+    CompletableFuture<ExecutionResult> invoke(GraphQLInvocationData invocationData, WebRequest webRequest);
+
+}

graphql-java-spring-webmvc/src/main/java/org/springframework/graphql/GraphQLInvocationData.java

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+package org.springframework.graphql;
+
+import graphql.Assert;
+import graphql.PublicApi;
+
+import java.util.Collections;
+import java.util.Map;
+
+@PublicApi
+public class GraphQLInvocationData {
+
+    private final String query;
+    private final String operationName;
+    private final Map<String, Object> variables;
+
+    public GraphQLInvocationData(String query, String operationName, Map<String, Object> variables) {
+        this.query = Assert.assertNotNull(query, () -> "query must be provided");
+        this.operationName = operationName;
+        this.variables = variables != null ? variables : Collections.emptyMap();
+    }
+
+    public String getQuery() {
+        return query;
+    }
+
+    public String getOperationName() {
+        return operationName;
+    }
+
+    public Map<String, Object> getVariables() {
+        return variables;
+    }
+}

graphql-java-spring-webmvc/src/main/java/org/springframework/graphql/components/DefaultExecutionResultHandler.java

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+package org.springframework.graphql.components;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import graphql.ExecutionResult;
+import graphql.Internal;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.graphql.ExecutionResultHandler;
+import org.springframework.stereotype.Component;
+
+import java.util.concurrent.CompletableFuture;
+
+@Component
+@Internal
+public class DefaultExecutionResultHandler implements ExecutionResultHandler {
+
+    @Autowired
+    ObjectMapper objectMapper;
+
+    @Override
+    public Object handleExecutionResult(CompletableFuture<ExecutionResult> executionResultCF) {
+        return executionResultCF.thenApply(ExecutionResult::toSpecification);
+    }
+}

graphql-java-spring-webmvc/src/main/java/org/springframework/graphql/components/DefaultGraphQLInvocation.java

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+package org.springframework.graphql.components;
+
+import graphql.ExecutionInput;
+import graphql.ExecutionResult;
+import graphql.GraphQL;
+import graphql.Internal;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.graphql.ExecutionInputCustomizer;
+import org.springframework.graphql.GraphQLInvocation;
+import org.springframework.graphql.GraphQLInvocationData;
+import org.springframework.stereotype.Component;
+import org.springframework.web.context.request.WebRequest;
+
+import java.util.concurrent.CompletableFuture;
+
+@Component
+@Internal
+public class DefaultGraphQLInvocation implements GraphQLInvocation {
+
+    @Autowired
+    GraphQL graphQL;
+
+    @Autowired
+    ExecutionInputCustomizer executionInputCustomizer;
+
+    @Override
+    public CompletableFuture<ExecutionResult> invoke(GraphQLInvocationData invocationData, WebRequest webRequest) {
+        ExecutionInput executionInput = ExecutionInput.newExecutionInput()
+                .query(invocationData.getQuery())
+                .operationName(invocationData.getOperationName())
+                .variables(invocationData.getVariables())
+                .build();
+        CompletableFuture<ExecutionInput> customizedExecutionInput = executionInputCustomizer.customizeExecutionInput(executionInput, webRequest);
+        return customizedExecutionInput.thenCompose(graphQL::executeAsync);
+    }
+
+}

graphql-java-spring-webmvc/src/main/java/org/springframework/graphql/components/GraphQLController.java

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+package org.springframework.graphql.components;
+
+
+import graphql.ExecutionResult;
+import graphql.Internal;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.graphql.ExecutionResultHandler;
+import org.springframework.graphql.GraphQLInvocation;
+import org.springframework.graphql.GraphQLInvocationData;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.context.request.WebRequest;
+
+import java.util.concurrent.CompletableFuture;
+
+@RestController
+@Internal
+public class GraphQLController {
+
+    @Autowired
+    GraphQLInvocation graphQLInvocation;
+
+    @Autowired
+    ExecutionResultHandler executionResultHandler;
+
+    @RequestMapping(value = "${graphql.url:graphql}",
+            method = RequestMethod.POST,
+            consumes = MediaType.APPLICATION_JSON_VALUE,
+            produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
+    public Object graphqlPOST(@RequestBody GraphQLRequestBody body,
+                              WebRequest webRequest) {
+        String query = body.getQuery();
+        if (query == null) {
+            query = "";
+        }
+        CompletableFuture<ExecutionResult> executionResult = graphQLInvocation.invoke(new GraphQLInvocationData(query, body.getOperationName(), body.getVariables()), webRequest);
+        return executionResultHandler.handleExecutionResult(executionResult);
+    }
+
+}

graphql-java-spring-webmvc/src/main/java/org/springframework/graphql/components/GraphQLRequestBody.java

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+package org.springframework.graphql.components;
+
+import graphql.Internal;
+
+import java.util.Map;
+
+@Internal
+public class GraphQLRequestBody {
+    private String query;
+    private String operationName;
+    private Map<String, Object> variables;
+
+    public String getQuery() {
+        return query;
+    }
+
+    public void setQuery(String query) {
+        this.query = query;
+    }
+
+    public String getOperationName() {
+        return operationName;
+    }
+
+    public void setOperationName(String operationName) {
+        this.operationName = operationName;
+    }
+
+    public Map<String, Object> getVariables() {
+        return variables;
+    }
+
+    public void setVariables(Map<String, Object> variables) {
+        this.variables = variables;
+    }
+}