{"id":105399,"date":"2020-06-14T15:15:40","date_gmt":"2020-06-14T12:15:40","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=105399"},"modified":"2020-06-11T11:55:33","modified_gmt":"2020-06-11T08:55:33","slug":"supersonic-subatomic-graphql","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2020\/06\/supersonic-subatomic-graphql.html","title":{"rendered":"Supersonic Subatomic GraphQL"},"content":{"rendered":"

MicroProfile GraphQL<\/a> is now included in the just released version 1.5.0<\/a> of Quarkus<\/a>.<\/p>\n

You can now use code.quarkus.io<\/a> to get going with Quarkus and include the SmallRye GraphQL Extension<\/a>.<\/p>\n

\n
\"\"<\/figure>\n<\/div>\n

This will create a Quarkus starter application with the following dependencies:<\/p>\n

\n<dependency>\n      <groupId>io.quarkus<\/groupId>\n      <artifactId>quarkus-resteasy<\/artifactId>\n    <\/dependency>\n    <dependency>\n      <groupId>io.quarkus<\/groupId>\n      <artifactId>quarkus-junit5<\/artifactId>\n      <scope>test<\/scope>\n    <\/dependency>\n    <dependency>\n      <groupId>io.rest-assured<\/groupId>\n      <artifactId>rest-assured<\/artifactId>\n      <scope>test<\/scope>\n    <\/dependency>\n    <dependency>\n      <groupId>io.quarkus<\/groupId>\n      <artifactId>quarkus-smallrye-graphql<\/artifactId>\n    <\/dependency><\/pre>\n
NOTE: At the moment, the example application created is a JAX-RS application. There is some work in progress<\/a> to allow extensions to define custom examples application, but until then we always get a JAX-RS application. You can remove the quarkus-resteasy<\/code> dependency as we do not need JAX-RS.<\/p>\n
Your first GraphQL Endpoint.<\/h2>\n
Let\u2019s change the ExampleResource<\/code> Rest service to be a GraphQL endpoint.<\/p>\n
    \n
  1. Replace the @Path(\"\/hello\")<\/code> class annotation with @GraphQLApi<\/code>.<\/li>\n
  2. Replace the @GET<\/code> method annotation with @Query<\/code>.<\/li>\n
  3. Remove the @Produces(MediaType.TEXT_PLAIN)<\/code> method annotation and all JAX-RS imports.<\/li>\n<\/ol>\n
    That is it! Your ExampleResource<\/code> should look like this now:<\/p>\n
    \n
    \n\n\n\n
    \n
    01<\/div>\n
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    13<\/div>\n<\/td>\n
    		\n
    \n
    package<\/code> org.acme;<\/code><\/div>\n
     <\/div>\n
    import<\/code> org.eclipse.microprofile.graphql.GraphQLApi;<\/code><\/div>\n
    import<\/code> org.eclipse.microprofile.graphql.Query;<\/code><\/div>\n
     <\/div>\n
    @GraphQLApi<\/code><\/div>\n
    public<\/code> class<\/code> ExampleResource {<\/code><\/div>\n
     <\/div>\n
        <\/code>@Query<\/code><\/div>\n
        <\/code>public<\/code> String hello() {<\/code><\/div>\n
            <\/code>return<\/code> \"hello\"<\/code>;<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n
    }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    You can now run the application using Quarkus dev mode:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n<\/td>\n
    		\n
    \n
    mvn quarkus:dev<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    Now browse to localhost:8080\/graphql-ui\/<\/a> and run the following query:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n
    2<\/div>\n
    3<\/div>\n<\/td>\n
    		\n
    \n
    {<\/code><\/div>\n
      <\/code>hello<\/code><\/div>\n
    }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    This will return:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n
    2<\/div>\n
    3<\/div>\n
    4<\/div>\n
    5<\/div>\n<\/td>\n
    		\n
    \n
    {<\/code><\/div>\n
      <\/code>\"data\"<\/code>: {<\/code><\/div>\n
        <\/code>\"hello\"<\/code>: <\/code>\"hello\"<\/code><\/div>\n
      <\/code>}<\/code><\/div>\n
    }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    Also see the Quarkus GraphQL Guide<\/a><\/p>\n
    A more detailed example<\/h2>\n
    Let\u2019s look at a more detailed example, get the source from this GitHub project<\/a><\/p>\n
    This is a multi-module application. First compile all modules. In the root:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n<\/td>\n
    		\n
    \n
    mvn clean install<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    Now browse to the quarkus example:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n<\/td>\n
    		\n
    \n
    cd quarkus-example<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    Look at ProfileGraphQLApi.java<\/code> that is marked as a @GraphQLApi<\/code>:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n
    2<\/div>\n
    3<\/div>\n
    4<\/div>\n<\/td>\n
    		\n
    \n
    @Query<\/code>(<\/code>\"person\"<\/code>)<\/code><\/div>\n
        <\/code>public<\/code> Person getPerson(<\/code>@Name<\/code>(<\/code>\"personId\"<\/code>) <\/code>int<\/code> personId){<\/code><\/div>\n
            <\/code>return<\/code> personDB.getPerson(personId);<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    Above method will get a person by personId<\/code>. As you can see the method is made queryable with the @Query<\/code> annotation. You can optionally provide the name (\u201cperson\u201d in this case), however the default would be \u201cperson\u201d anyway (method name without \u201cget\u201d). You can also optionally name the parameter, but the default would be the parameter name (\u201cpersonId\u201d).<\/p>\n
    The Person Object is a POJO that represents a Person (User or Member) in the system. It has many fields, some that are other complex POJOs:<\/p>\n
    \n
    \"\"<\/figure>\n<\/div>\n
    However, the Query<\/code> annotation makes it possible to query the exact fields we are interested in.<\/p>\n
    Run the example application:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n<\/td>\n
    		\n
    \n
    mvn quarkus:dev<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    Now browse to localhost:8080\/graphql-ui\/<\/a> and run the following query:<\/p>\n
    \n
    \n\n\n\n
    \n
    01<\/div>\n
    02<\/div>\n
    03<\/div>\n
    04<\/div>\n
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    		\n
    \n
    {<\/code><\/div>\n
      <\/code>person(personId:<\/code>1<\/code>){<\/code><\/div>\n
        <\/code>names<\/code><\/div>\n
        <\/code>surname<\/code><\/div>\n
        <\/code>scores{<\/code><\/div>\n
          <\/code>name<\/code><\/div>\n
          <\/code>value<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n
      <\/code>}<\/code><\/div>\n
    }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    Notice that you have \u2018code insight\u2019 in the editor. That is because GraphQL has a schema and also supports introspection.<\/p>\n
    We can request only the fields we are interested in, making the payload much smaller.<\/p>\n
    \n
    \"\"<\/figure>\n<\/div>\n
    We can also combine queries, i.e., lets say we want to get the fields for person 1 as shown above, and also the name and surname for person 2, we can do the following:<\/p>\n
    \n
    \n\n\n\n
    \n
    01<\/div>\n
    02<\/div>\n
    03<\/div>\n
    04<\/div>\n
    05<\/div>\n
    06<\/div>\n
    07<\/div>\n
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    14<\/div>\n<\/td>\n
    		\n
    \n
    {<\/code><\/div>\n
      <\/code>person1: person(personId:<\/code>1<\/code>){<\/code><\/div>\n
        <\/code>names<\/code><\/div>\n
        <\/code>surname<\/code><\/div>\n
        <\/code>scores{<\/code><\/div>\n
          <\/code>name<\/code><\/div>\n
          <\/code>value<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n
      <\/code>}<\/code><\/div>\n
      <\/code>person2: person(personId:<\/code>2<\/code>){<\/code><\/div>\n
        <\/code>names<\/code><\/div>\n
        <\/code>surname<\/code><\/div>\n
      <\/code>}<\/code><\/div>\n
    }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    This will return :
     
    <\/div> <\/div><\/p>\n
    \n
    \n\n\n\n
    \n
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    36<\/div>\n<\/td>\n
    		\n
    \n
    {<\/code><\/div>\n
      <\/code>\"data\"<\/code>: {<\/code><\/div>\n
        <\/code>\"person1\"<\/code>: {<\/code><\/div>\n
          <\/code>\"names\"<\/code>: [<\/code><\/div>\n
            <\/code>\"Christine\"<\/code>,<\/code><\/div>\n
            <\/code>\"Fabian\"<\/code><\/div>\n
          <\/code>],<\/code><\/div>\n
          <\/code>\"surname\"<\/code>: <\/code>\"O'Reilly\"<\/code>,<\/code><\/div>\n
          <\/code>\"scores\"<\/code>: [<\/code><\/div>\n
            <\/code>{<\/code><\/div>\n
              <\/code>\"name\"<\/code>: <\/code>\"Driving\"<\/code>,<\/code><\/div>\n
              <\/code>\"value\"<\/code>: <\/code>15<\/code><\/div>\n
            <\/code>},<\/code><\/div>\n
            <\/code>{<\/code><\/div>\n
              <\/code>\"name\"<\/code>: <\/code>\"Fitness\"<\/code>,<\/code><\/div>\n
              <\/code>\"value\"<\/code>: <\/code>94<\/code><\/div>\n
            <\/code>},<\/code><\/div>\n
            <\/code>{<\/code><\/div>\n
              <\/code>\"name\"<\/code>: <\/code>\"Activity\"<\/code>,<\/code><\/div>\n
              <\/code>\"value\"<\/code>: <\/code>63<\/code><\/div>\n
            <\/code>},<\/code><\/div>\n
            <\/code>{<\/code><\/div>\n
              <\/code>\"name\"<\/code>: <\/code>\"Financial\"<\/code>,<\/code><\/div>\n
              <\/code>\"value\"<\/code>: <\/code>22<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
          <\/code>]<\/code><\/div>\n
        <\/code>},<\/code><\/div>\n
        <\/code>\"person2\"<\/code>: {<\/code><\/div>\n
          <\/code>\"names\"<\/code>: [<\/code><\/div>\n
            <\/code>\"Masako\"<\/code>,<\/code><\/div>\n
            <\/code>\"Errol\"<\/code><\/div>\n
          <\/code>],<\/code><\/div>\n
          <\/code>\"surname\"<\/code>: <\/code>\"Zemlak\"<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n
      <\/code>}<\/code><\/div>\n
    }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    Source fields<\/h3>\n
    If you look closely at our query, you will see we asked for the scores<\/code> field of the person, however, the Person<\/code> POJO does not contain a scores<\/code> field. We added the scores<\/code> field by adding a @Source<\/code> field to the person:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n
    2<\/div>\n
    3<\/div>\n
    4<\/div>\n
    5<\/div>\n
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    7<\/div>\n
    8<\/div>\n<\/td>\n
    		\n
    \n
    @Query<\/code>(<\/code>\"person\"<\/code>)<\/code><\/div>\n
        <\/code>public<\/code> Person getPerson(<\/code>@Name<\/code>(<\/code>\"personId\"<\/code>) <\/code>int<\/code> personId){<\/code><\/div>\n
            <\/code>return<\/code> personDB.getPerson(personId);<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n
     <\/div>\n
        <\/code>public<\/code> List<Score> getScores(<\/code>@Source<\/code> Person person) {<\/code><\/div>\n
            <\/code>return<\/code> scoreDB.getScores(person.getIdNumber());<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    So we can add fields that merge onto the output by adding the @Source<\/code> parameter that matches the response type.<\/p>\n
    Partial results<\/h3>\n
    The above example merges two different data sources, but let\u2019s say the score system is down. We will then still return the data we have, and an error for the score:<\/p>\n
    \n
    \n\n\n\n
    \n
    01<\/div>\n
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    31<\/div>\n<\/td>\n
    		\n
    \n
    {<\/code><\/div>\n
      <\/code>\"errors\"<\/code>: [<\/code><\/div>\n
        <\/code>{<\/code><\/div>\n
          <\/code>\"message\"<\/code>: <\/code>\"Scores for person [797-95-4822] is not available\"<\/code>,<\/code><\/div>\n
          <\/code>\"locations\"<\/code>: [<\/code><\/div>\n
            <\/code>{<\/code><\/div>\n
              <\/code>\"line\"<\/code>: <\/code>5<\/code>,<\/code><\/div>\n
              <\/code>\"column\"<\/code>: <\/code>5<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
          <\/code>],<\/code><\/div>\n
          <\/code>\"path\"<\/code>: [<\/code><\/div>\n
            <\/code>\"person\"<\/code>,<\/code><\/div>\n
            <\/code>\"scores2\"<\/code><\/div>\n
          <\/code>],<\/code><\/div>\n
          <\/code>\"extensions\"<\/code>: {<\/code><\/div>\n
            <\/code>\"exception\"<\/code>: <\/code>\"com.github.phillipkruger.user.graphql.ScoresNotAvailableException\"<\/code>,<\/code><\/div>\n
            <\/code>\"classification\"<\/code>: <\/code>\"DataFetchingException\"<\/code><\/div>\n
          <\/code>}<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n
      <\/code>],<\/code><\/div>\n
      <\/code>\"data\"<\/code>: {<\/code><\/div>\n
        <\/code>\"person\"<\/code>: {<\/code><\/div>\n
          <\/code>\"names\"<\/code>: [<\/code><\/div>\n
            <\/code>\"Christine\"<\/code>,<\/code><\/div>\n
            <\/code>\"Fabian\"<\/code><\/div>\n
          <\/code>],<\/code><\/div>\n
          <\/code>\"surname\"<\/code>: <\/code>\"O'Reilly\"<\/code>,<\/code><\/div>\n
          <\/code>\"scores2\"<\/code>: <\/code>null<\/code><\/div>\n
        <\/code>}<\/code><\/div>\n
      <\/code>}<\/code><\/div>\n
    }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    Native mode<\/h3>\n
    Let\u2019s run this example in native mode (use graalvm-ce-java11-19.3.2):<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n<\/td>\n
    		\n
    \n
    mvn -Pnative clean install<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    This will create a native executable and will now start the application very quickly:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n<\/td>\n
    		\n
    \n
    .\/target\/quarkus-example-<\/code>1.0<\/code>.<\/code>0<\/code>-SNAPSHOT-runner<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    \n
    \"\"<\/figure>\n<\/div>\n
    In the pipeline<\/h2>\n
    This is the first version of the MicroProfile GraphQL Spec and there are many things in the pipeline. One of those is a client. We are proposing two types of clients:<\/p>\n
    Dynamic<\/h3>\n
    The dynamic client will allow you to build a query using a builder:<\/p>\n
    \n
    \n\n\n\n
    \n
    01<\/div>\n
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    		\n
    \n
    \/\/ Building of the graphql document.<\/code><\/div>\n
    Document myDocument = document(<\/code><\/div>\n
                    <\/code>operation(Operation.Type.QUERY,<\/code><\/div>\n
                            <\/code>field(<\/code>\"people\"<\/code>,<\/code><\/div>\n
                                    <\/code>field(<\/code>\"id\"<\/code>),<\/code><\/div>\n
                                    <\/code>field(<\/code>\"name\"<\/code>)<\/code><\/div>\n
                            <\/code>)));<\/code><\/div>\n
     <\/div>\n
    \/\/ Serialization of the document into a string, ready to be sent.<\/code><\/div>\n
    String graphqlRequest = myDocument.toString();<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    For more details see: github.com\/worldline\/dynaql<\/a><\/p>\n
    Type safe<\/h3>\n
    The type safe client will be closer to MicroProfile RESTClient. Looking at the same example as above, lets see how we can to use it. From the root of the project, browse to the quarkus-client<\/code> folder. This example uses Quarkus Command Mode<\/a> to make a Query.<\/p>\n
    The client is not yet a Quarkus Extension, so we add it in our project like this:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n
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    		\n
    \n
    <dependency><\/code><\/div>\n
        <\/code><groupId>io.smallrye<\/groupId><\/code><\/div>\n
        <\/code><artifactId>smallrye-graphql-client<\/artifactId><\/code><\/div>\n
        <\/code><version>${smallrye-graphql.version}<\/version><\/code><\/div>\n
    <\/dependency><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    Now we can create a POJO that contains only fields that we are interested in. Looking at Person<\/code> and Score<\/code> in the client module, it is much smaller than the definition on the server side:<\/p>\n
    \n
    \"\"<\/figure>\n<\/div>\n
    All we need to do now is to add an interface that defines the queries that we are interested in:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n
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    		\n
    \n
    @GraphQlClientApi<\/code><\/div>\n
    public<\/code> interface<\/code> PersonGraphQLClient {<\/code><\/div>\n
     <\/div>\n
        <\/code>public<\/code> Person person(<\/code>int<\/code> personId);<\/code><\/div>\n
     <\/div>\n
    }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    And now we can use this:<\/p>\n
    \n
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    3<\/div>\n
    4<\/div>\n
    5<\/div>\n
    6<\/div>\n<\/td>\n
    		\n
    \n
    \/\/@Inject<\/code><\/div>\n
        <\/code>\/\/PersonGraphQLClient personClient; or<\/code><\/div>\n
        <\/code>PersonGraphQLClient personClient = GraphQlClientBuilder.newBuilder().build(PersonGraphQLClient.<\/code>class<\/code>);<\/code><\/div>\n
     <\/div>\n
        <\/code>\/\/ ...<\/code><\/div>\n
        <\/code>Person person = personClient.person(id);<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    Running the Quarkus client app we can now make a call to the server (make sure this is still running) and print the response:<\/p>\n
    \n
    \n\n\n\n
    \n
    1<\/div>\n<\/td>\n
    		\n
    \n
    java -jar target\/quarkus-client-<\/code>1.0<\/code>.<\/code>0<\/code>-SNAPSHOT-runner.jar <\/code>2<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
    The number (2) is the personId<\/code> in our example:<\/p>\n
    \n
    \"\"<\/figure>\n<\/div>\n
    Summary<\/h2>\n
    This is a short and quick introduction to MicroProfile GraphQL that is now available in Quarkus. There are many more features<\/a> and even more planned<\/a>, so stay tuned.<\/p>\n
    \n\n\n\n
    \n
    Published on Java Code Geeks with permission by Phillip Kr\u00fcger, partner at our JCG program<\/a>. See the original article here: Supersonic Subatomic GraphQL<\/a><\/p>\n
    Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
    MicroProfile GraphQL is now included in the just released version 1.5.0 of Quarkus. You can now use code.quarkus.io to get going with Quarkus and include the SmallRye GraphQL Extension. This will create a Quarkus starter application with the following dependencies: <dependency> <groupId>io.quarkus<\/groupId> <artifactId>quarkus-resteasy<\/artifactId> <\/dependency> <dependency> <groupId>io.quarkus<\/groupId> <artifactId>quarkus-junit5<\/artifactId> <scope>test<\/scope> <\/dependency> <dependency> <groupId>io.rest-assured<\/groupId> <artifactId>rest-assured<\/artifactId> <scope>test<\/scope> <\/dependency> <dependency> …<\/p>\n","protected":false},"author":10628,"featured_media":112,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[1458,1731,1975],"class_list":["post-105399","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-graphql","tag-microprofile","tag-quarkus"],"yoast_head":"\nSupersonic Subatomic GraphQL - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn about GraphQL? 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