{"id":3488,"date":"2012-11-21T19:00:39","date_gmt":"2012-11-21T17:00:39","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=3488"},"modified":"2012-11-21T12:49:11","modified_gmt":"2012-11-21T10:49:11","slug":"json-schema-generation-in-jersey","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2012\/11\/json-schema-generation-in-jersey.html","title":{"rendered":"JSON-Schema generation in Jersey"},"content":{"rendered":"

So in my\u00a0previous post<\/a> I talked about a proposal to allow the use of JSON-Schema in a WADL, this post looks at how to get this working with a recently build of Jersey. You are going to have to download \/ reference 1.16SNAPSHOT until 1.16 is released.<\/p>\n

If you are using Maven this should be quite straight forward to update your dependencies assuming you already have jersey and jersey-json. You are just going to need to add a dependency on the ‘jersey-wadl-json-schema’ artefact from the ‘com.sun.jersey.contribs’ group to get the new feature.<\/p>\n

If you are outside of Maven the easiest thing to do would be to download the latest\u00a0jersey-archive<\/a> and then the\u00a0jersey-wadl-json-schema<\/a> jar. How you deploy these is tool specific, but if you are using WLS then here are\u00a0some specific notes<\/a> on how to upgrade the version of Jersey.<\/p>\n

Once you have this working, you need to create a WadlGeneratorConfig class in order to enable this new grammar generation:<\/p>\n

package jersey;\r\n\r\nimport com.sun.jersey.api.wadl.config.WadlGeneratorConfig;\r\nimport com.sun.jersey.api.wadl.config.WadlGeneratorDescription;\r\nimport com.sun.jersey.wadl.generators.json.WadlGeneratorJSONGrammarGenerator;\r\n\r\nimport java.util.List;\r\n\r\npublic class JsonGeneratorConfig extends WadlGeneratorConfig {\r\n\r\n    @Override\r\n    public List\r\n\r\n               configure() {\r\n        return generator(WadlGeneratorJSONGrammarGenerator.class).descriptions();\r\n    }\r\n}<\/pre>\n
This can then be registered in a variety of ways, here is an example using a servlet init param. Note also that to make this example simple that we are using the Jersey POJO mapping; but whilst writing this blog I noticed that this setting affected the format of the\u00a0JSON version of the WADL<\/a> in case you try this.
 
<\/div> <\/div><\/p>\n
<?xml version = '1.0' encoding = 'ISO-8859-1'?>\r\n<web-app xmlns='http:\/\/java.sun.com\/xml\/ns\/javaee' xmlns:xsi='http:\/\/www.w3.org\/2001\/XMLSchema-instance'\r\n         xsi:schemaLocation='http:\/\/java.sun.com\/xml\/ns\/javaee http:\/\/java.sun.com\/xml\/ns\/javaee\/web-app_3_0.xsd'\r\n         version='3.0'>\r\n  <servlet>\r\n    <servlet-name>jersey<\/servlet-name>\r\n    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer<\/servlet-class>\r\n    <init-param>\r\n      <param-name>com.sun.jersey.config.property.WadlGeneratorConfig<\/param-name>\r\n      <param-value>jersey.JsonGeneratorConfig<\/param-value>\r\n    <\/init-param>\r\n    <init-param>\r\n      <param-name>com.sun.jersey.api.json.POJOMappingFeature<\/param-name>\r\n      <param-value>true<\/param-value>\r\n    <\/init-param>\r\n    <load-on-startup>1<\/load-on-startup>\r\n  <\/servlet>\r\n  <servlet-mapping>\r\n    <servlet-name>jersey<\/servlet-name>\r\n    <url-pattern>\/resources\/*<\/url-pattern>\r\n  <\/servlet-mapping>\r\n<\/web-app><\/pre>\n
So I put together a really simple echo service, just to check this is all working:<\/p>\n
package jersey;\r\n\r\nimport javax.ws.rs.Consumes;\r\nimport javax.ws.rs.GET;\r\nimport javax.ws.rs.POST;\r\nimport javax.ws.rs.Path;\r\nimport javax.ws.rs.Produces;\r\n\r\n@Path('\/echo')\r\npublic class EchoResource {\r\n\r\n    @GET\r\n    @Produces('application\/json')\r\n    public EchoBean echo() {\r\n        EchoBean bean = new EchoBean();\r\n        bean.setMessage('Hello');\r\n        return bean;\r\n    }\r\n\r\n    @POST\r\n    @Consumes('application\/json')\r\n    @Produces('application\/json')\r\n    public EchoBean echo(EchoBean echo) {\r\n        return echo;\r\n    }\r\n\r\n}\r\n\r\nand\r\n\r\npackage jersey;\r\n\r\npublic class EchoBean {\r\n    public EchoBean() {\r\n        super();\r\n    }\r\n\r\n    private String message;\r\n\r\n    public void setMessage(String message) {\r\n        this.message = message;\r\n    }\r\n\r\n    public String getMessage() {\r\n        return message;\r\n    }\r\n\r\n}<\/pre>\n
This very simple example results in the following WADL with the JSON-Schema elements referenced:<\/p>\n
<?xml version = '1.0' encoding = 'UTF-8'?>\r\n<ns0:application xmlns:ns0='http:\/\/wadl.dev.java.net\/2009\/02'>\r\n   <ns0:doc xmlns:ns1='http:\/\/jersey.java.net\/' ns1:generatedBy='Jersey: 1.16-SNAPSHOT 11\/19\/2012 12:59 AM'\/>\r\n   <ns0:grammars\/>\r\n   <ns0:resources base='http:\/\/localhost:7103\/Jersey\/resources\/'>\r\n      <ns0:resource path='\/echo'>\r\n         <ns0:method id='echo' name='GET'>\r\n            <ns0:response>\r\n               <ns0:representation mediaType='application\/json' xmlns:ns2='http:\/\/wadl.dev.java.net\/2009\/02\/json-schema' ns2:describedby='application.wadl\/echoBean'\/>\r\n            <\/ns0:response>\r\n         <\/ns0:method>\r\n         <ns0:method id='echo' name='POST'>\r\n            <ns0:request>\r\n               <ns0:representation mediaType='application\/json' xmlns:ns3='http:\/\/wadl.dev.java.net\/2009\/02\/json-schema' ns3:describedby='application.wadl\/echoBean'\/>\r\n            <\/ns0:request>\r\n            <ns0:response>\r\n               <ns0:representation mediaType='application\/json' xmlns:ns4='http:\/\/wadl.dev.java.net\/2009\/02\/json-schema' ns4:describedby='application.wadl\/echoBean'\/>\r\n            <\/ns0:response>\r\n         <\/ns0:method>\r\n      <\/ns0:resource>\r\n   <\/ns0:resources>\r\n<\/ns0:application><\/pre>\n
The URI application.wadl\/echoBean contains this simple JSON-Schema definition:<\/p>\n
{\r\n    'type' : 'object',\r\n    'properties' : {\r\n        'message' : {\r\n            'type' : 'string'\r\n        }\r\n    },\r\n    'name' : 'echoBean'\r\n}<\/pre>\n
Now there are a number of limitations in the current design, not least that the generated schema doesn’t take into account any\u00a0notation settings<\/a>. But I thought this would be enough to provoke feedback on whether this feature would be useful generally. There appears to be a growing interest in JSON-Schema both around the net and internally to Oracle, so it would be interesting to see whether this description becomes more common.
\n <\/p>\n
Reference: <\/em><\/strong>JSON-Schema generation in Jersey<\/a> from our JCG partner<\/a> Gerard Davison at the Gerard Davison’s blog<\/a> blog.<\/p>\n","protected":false},"excerpt":{"rendered":"
So in my\u00a0previous post I talked about a proposal to allow the use of JSON-Schema in a WADL, this post looks at how to get this working with a recently build of Jersey. You are going to have to download \/ reference 1.16SNAPSHOT until 1.16 is released. If you are using Maven this should be …<\/p>\n","protected":false},"author":81,"featured_media":175,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[219,69],"class_list":["post-3488","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-jersey","tag-json"],"yoast_head":"\nJSON-Schema generation in Jersey<\/title>\n<meta name=\"description\" content=\"So in my\u00a0previous post I talked about a proposal to allow the use of JSON-Schema in a WADL, this post looks at how to get this working with a recently\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.javacodegeeks.com\/2012\/11\/json-schema-generation-in-jersey.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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