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‎pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>3.1.2</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.graphql</groupId>
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<artifactId>demo</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>demo</name>
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<description>Demo project for GraphQl Spring Boot</description>
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<properties>
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<java.version>17</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-graphql</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-jdbc</artifactId>
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</dependency>
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<dependency>
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<groupId>org.postgresql</groupId>
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<artifactId>postgresql</artifactId>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>com.graphql-java-kickstart</groupId>
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<artifactId>graphql-spring-boot-starter</artifactId>
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<version>15.0.0</version>
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</dependency>
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<dependency>
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<groupId>com.graphql-java-kickstart</groupId>
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<artifactId>graphql-java-tools</artifactId>
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<version>13.0.3</version>
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</dependency>
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<dependency>
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<groupId>org.postgresql</groupId>
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<artifactId>postgresql</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-jdbc</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.graphql</groupId>
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<artifactId>spring-graphql-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<configuration>
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<excludes>
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<exclude>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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</exclude>
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</excludes>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎src/main/java/com/graphql/demo/Book.java

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package com.graphql.demo;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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@Data
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@AllArgsConstructor
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public class Book {
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private Long id;
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private String title;
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private String author;
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}

‎src/main/java/com/graphql/demo/BookQueryResolver.java

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package com.graphql.demo;
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import java.util.List;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.jdbc.core.JdbcTemplate;
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import org.springframework.stereotype.Component;
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import graphql.kickstart.tools.GraphQLQueryResolver;
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import graphql.schema.DataFetchingEnvironment;
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@Component
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public class BookQueryResolver implements GraphQLQueryResolver {
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@Autowired
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private JdbcTemplate jdbcTemplate;
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public List<Book> books(DataFetchingEnvironment dataFetchingEnvironment)
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{
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try{
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return jdbcTemplate.query("SELECT * FROM public.books",(rs,rowNum) -> new Book(
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rs.getLong("id"),
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rs.getString("title"),
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rs.getString("author")
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));
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}
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catch(Exception e )
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{
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System.out.println("Error in books");
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throw new CustomGraphQLException("An error occured while fetching books");
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}
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}
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}

‎src/main/java/com/graphql/demo/CustomGraphQLException.java

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package com.graphql.demo;
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public class CustomGraphQLException extends RuntimeException {
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public CustomGraphQLException(String message)
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{
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super(message);
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}
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}

‎src/main/java/com/graphql/demo/CustomGraphQLHttpServlet.java

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package com.graphql.demo;
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import java.io.IOException;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.http.HttpMethod;
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import graphql.ExecutionResult;
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import graphql.GraphQL;
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import graphql.kickstart.servlet.GraphQLConfiguration;
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import graphql.kickstart.servlet.GraphQLHttpServlet;
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import graphql.schema.GraphQLSchema;
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import jakarta.servlet.http.HttpServletRequest;
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import jakarta.servlet.http.HttpServletResponse;
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public class CustomGraphQLHttpServlet extends GraphQLHttpServlet {
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@Autowired
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private GraphQLSchema graphQLSchema;
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@Override
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protected GraphQLConfiguration getConfiguration() {
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// TODO Auto-generated method stub
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System.out.println("printing graphql schema:"+graphQLSchema.getQueryType().getName());
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return GraphQLConfiguration.with(graphQLSchema).build();
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}
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
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CustomGraphQLResponseWrapper responseWrapper = new CustomGraphQLResponseWrapper(resp);
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super.doGet(req, responseWrapper);
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String responseBody = responseWrapper.getCapturedResponse();
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if (responseContainsError(responseBody)) {
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resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); // Or any other status code you deem appropriate
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}
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try {
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resp.getWriter().write(responseBody);
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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@Override
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protected void doPost(HttpServletRequest req, HttpServletResponse resp) {
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CustomGraphQLResponseWrapper responseWrapper = new CustomGraphQLResponseWrapper(resp);
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super.doPost(req, responseWrapper);
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String responseBody = responseWrapper.getCapturedResponse();
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if (responseContainsError(responseBody)) {
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resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); // Or any other status code you deem appropriate
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}
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try {
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resp.getWriter().write(responseBody);
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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private boolean responseContainsError(String responseBody) {
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// Here, you can inspect the response and set the status code based on the GraphQL response.
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// For example, if you want to set a 400 status code for a specific error:
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return responseBody.contains("\"errors\"");
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}
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// ... other necessary overrides, if any
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}

‎src/main/java/com/graphql/demo/CustomGraphQLResponseWrapper.java

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package com.graphql.demo;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.OutputStreamWriter;
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import java.io.PrintWriter;
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import jakarta.servlet.ServletOutputStream;
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import jakarta.servlet.WriteListener;
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import jakarta.servlet.http.HttpServletResponse;
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import jakarta.servlet.http.HttpServletResponseWrapper;
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public class CustomGraphQLResponseWrapper extends HttpServletResponseWrapper {
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public CustomGraphQLResponseWrapper(HttpServletResponse response) {
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super(response);
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//TODO Auto-generated constructor stub
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}
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private final ByteArrayOutputStream capture = new ByteArrayOutputStream();
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private final ServletOutputStream output = new CaptureServletOutputStream(capture);
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private PrintWriter writer;
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@Override
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public ServletOutputStream getOutputStream() throws IOException {
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return output;
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}
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@Override
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public PrintWriter getWriter() throws IOException {
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if (writer == null) {
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writer = new PrintWriter(new OutputStreamWriter(capture, getCharacterEncoding()));
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}
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return writer;
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}
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public String getCapturedResponse() {
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return capture.toString();
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}
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private static class CaptureServletOutputStream extends ServletOutputStream {
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private final ByteArrayOutputStream capture;
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public CaptureServletOutputStream(ByteArrayOutputStream capture) {
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this.capture = capture;
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}
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@Override
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public boolean isReady() {
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return true;
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}
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@Override
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public void setWriteListener(WriteListener listener) {
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// No-op
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}
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@Override
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public void write(int b) throws IOException {
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capture.write(b);
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}
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}
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}

‎src/main/java/com/graphql/demo/DemoApplication.java

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package com.graphql.demo;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class DemoApplication {
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public static void main(String[] args) {
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SpringApplication.run(DemoApplication.class, args);
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}
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}

‎src/main/java/com/graphql/demo/GraphQLConfig.java

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package com.graphql.demo;
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import org.springframework.boot.web.servlet.ServletRegistrationBean;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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@Configuration
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public class GraphQLConfig {
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@Bean
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public ServletRegistrationBean<CustomGraphQLHttpServlet> graphQLServletRegistrationBean() {
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ServletRegistrationBean<CustomGraphQLHttpServlet> registrationBean = new ServletRegistrationBean<>(new CustomGraphQLHttpServlet(), "/graphql");
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return registrationBean;
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}
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}

‎src/main/resources/application.properties

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spring.datasource.url=jdbc:postgresql://localhost:5332/postgres
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spring.datssource.username=baeldung
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spring.datasource.password=baeldung
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graphql.servlet.enabled=false
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server.port=8080
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graphql.tools.schema-location-pattern=**/graphql/*.graphqls

‎src/main/resources/graphql/book.graphqls

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type Query{
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books: [Book]
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}
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type Book {
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id: ID!
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title: String!
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author: String!
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}

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