{"id":70977,"date":"2017-11-30T22:00:57","date_gmt":"2017-11-30T20:00:57","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=70977"},"modified":"2017-11-30T11:21:11","modified_gmt":"2017-11-30T09:21:11","slug":"easy-java-ee-microservices-payara-micro","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2017\/11\/easy-java-ee-microservices-payara-micro.html","title":{"rendered":"Easy Java EE Microservices with Payara Micro"},"content":{"rendered":"

Wondering how to get started with Java EE Microservices?\u00a0 It only takes a few quick steps to deploy a Microservice using Java EE APIs.\u00a0 Many think that Java EE is too heavyweight for use with Microservices, but that is simply not the case…especially if you only utilize the Java EE specifications that are required by your service.\u00a0 In this brief post, I’ll demonstrate how to quickly develop a Microservice with Java EE and then deploy to Payara Micro.<\/p>\n

To download the example project, please go to GitHub:\u00a0\u00a0https:\/\/github.com\/juneau001\/SimpleService<\/a><\/p>\n

For the purposes of this example, I will utilize NetBeans, but any Java IDE will suffice.\u00a0 To get started, create a Maven web application and name it SimpleService.\u00a0 Next, create two Java packages:\u00a0 org.simpleservice and org.simpleservice.entity.\u00a0 Once complete, the project should resemble the following figure:<\/p>\n

\"\"<\/a><\/p>\n

Now many believe that a Microservice should not connect to an enterprise database, but I will leave that for those who wish to debate.\u00a0 In this example, I will connect this service to a central Apache derby database to obtain data because I believe this to be a very likely scenario in many organizations.\u00a0 In this case, we’ll create a “Suggested Name” database web service, which will query a database table of suggested names for the upcoming EE4J platform.\u00a0 To create the infrastructure, connect to a local Apache Derby database and create it using the following SQL:<\/p>\n

create table SUGGESTED_NAME (\r\nid numeric primary key,\r\nname varchar(150));\r\n\r\ninsert into suggested_name values(1, 'Open EE');\r\ninsert into suggested_name values(2, 'Open JOE');\r\ninsert into suggested_name values(3, 'Cappucino');<\/pre>\n
Next, open the Maven POM file for the SimpleService project and add the following dependencies:<\/p>\n
<dependencies>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <groupId>javax.ws.rs<\/groupId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <artifactId>javax.ws.rs-api<\/artifactId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <version>2.1<\/version>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <scope>provided<\/scope>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <\/dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <groupId>javax.persistence<\/groupId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <artifactId>javax.persistence-api<\/artifactId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <version>2.2<\/version>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <scope>provided<\/scope>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <\/dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <groupId>javax.validation<\/groupId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <artifactId>validation-api<\/artifactId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <version>2.0.0.Final<\/version>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <\/dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <groupId>javax.ejb<\/groupId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <artifactId>javax.ejb-api<\/artifactId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <version>3.2<\/version>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <type>jar<\/type>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <\/dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <groupId>org.eclipse.persistence<\/groupId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <artifactId>eclipselink<\/artifactId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <version>2.5.2<\/version>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <\/dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <groupId>org.eclipse.persistence<\/groupId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <artifactId>org.eclipse.persistence.jpa.modelgen.processor<\/artifactId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <version>2.5.2<\/version>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <scope>provided<\/scope>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <\/dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <dependency>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <groupId>org.apache.derby<\/groupId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <artifactId>derbyclient<\/artifactId>\r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <version>10.14.1.0<\/version>\r\n\u00a0 \u00a0 \u00a0 \u00a0 <\/dependency>\r\n\u00a0 \u00a0 <\/dependencies><\/pre>\n
Note that there is no Java EE dependency.\u00a0 This is because I am utilizing only those dependencies that are required for the service.\u00a0 Each dependency is added separately.
 
<\/div> <\/div><\/p>\n
Next, create a package org.simpleservice.entity, and create an entity class named SuggestedName within it.\u00a0 For brevity, I’m not going into all of the sources here, but you can check the sources out on GitHub (https:\/\/github.com\/juneau001\/SimpleService<\/a>).<\/p>\n
We’ll need to implement our JAX-RS web service class next.\u00a0 To configure the Java EE application for JAX-RS, let’s create a class named ApplicationConfig and place it within the org.simpleservice package:<\/p>\n
import java.util.Set;\r\nimport javax.ws.rs.core.Application;\r\n\r\n\/**\r\n\u00a0*\r\n\u00a0* @author Juneau\r\n\u00a0*\/\r\n@javax.ws.rs.ApplicationPath(\"rest\")\r\npublic class ApplicationConfig extends Application {\r\n\u00a0 \u00a0 @Override\r\n\u00a0 \u00a0 public Set<Class<?>> getClasses() {\r\n\u00a0 \u00a0 \u00a0 \u00a0 Set<Class<?>> resources = new java.util.HashSet<>();\r\n\u00a0 \u00a0 \u00a0 \u00a0 resources.add(org.simpleservice.SuggestedNameService.class);\r\n\u00a0 \u00a0 \u00a0 \u00a0 return resources;\r\n\u00a0 \u00a0 }\r\n}<\/pre>\n
Next, I’ll create the JAX-RS web service class itself, and I will name it SuggestedNameService.\u00a0 Here are the sources for the SuggestedNameService class.\u00a0 Note that I have injected a Persistence Unit.\u00a0 I will get to that next.<\/p>\n
@Stateless\r\n \r\n@Path(\"suggestedNameService\")\r\n \r\npublic class SuggestedNameService {\r\n \r\n\r\n \r\n\u00a0 \u00a0 @PersistenceContext(unitName = \"SimpleService_1.0PU\")\r\n \r\n\u00a0 \u00a0 private EntityManager em;\r\n \r\n\r\n \r\n\r\n \r\n\u00a0 \u00a0 @GET\r\n \r\n\u00a0 \u00a0 @Path(\"{id}\")\r\n \r\n\u00a0 \u00a0 @Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})\r\n \r\n\u00a0 \u00a0 public SuggestedName find(@PathParam(\"id\") BigDecimal id) {\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 SuggestedName suggestedName = null;\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 try {\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 suggestedName = (SuggestedName)\u00a0\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 em.createQuery(\"select object(o) from\u00a0SuggesetedName o \" +\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \"where o.id = :id\")\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 .setParameter(\"id\", id)\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 .getSingleResult();\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 } catch (NoResultException ex){\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"Error: \"\u00a0 + ex);\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 }\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 return suggestedName;\r\n \r\n\u00a0 \u00a0 }\r\n \r\n\u00a0 \u00a0\r\n \r\n\u00a0 \u00a0 @GET\r\n \r\n\u00a0 \u00a0 @Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})\r\n \r\n\u00a0 \u00a0 public List<SuggestedName> findAll() {\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 List<SuggestedName> suggestedNames = null;\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 try {\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 suggestedNames = em.createQuery(\"select object(o) from SuggestedName o\")\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 .getResultList();\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 } catch (NoResultException ex){\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"Error: \"\u00a0 + ex);\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 }\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 return suggestedNames;\r\n \r\n\u00a0 \u00a0 }\r\n \r\n\r\n \r\n\u00a0 \u00a0 protected EntityManager getEntityManager() {\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 return em;\r\n \r\n\u00a0 \u00a0 }\r\n \r\n\u00a0 \u00a0\u00a0\r\n \r\n}<\/pre>\n
Since this service will connect to a database, I will create a persistence unit for the project.\u00a0 This can be easily done in NetBeans by right-clicking the project and choosing New->Persistence->Persistence Unit.\u00a0 Name the persistence unit SimpleService_1.0PU and use EclipseLink as the provider.\u00a0 Do not add a data source at this point.<\/p>\n
\"\"<\/a><\/p>\n
Once created, open the Persistence Unit and add the connection information.\u00a0 In this case, I will connect to a JTA data source that I’ll define next.\u00a0 The data source is named DerbyDataSource, so the content of the Persistence Unit (persistence.xml) should look as follows:<\/p>\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n\r\n \r\n<persistence version=\"2.1\" xmlns=\"http:\/\/xmlns.jcp.org\/xml\/ns\/persistence\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\" xsi:schemaLocation=\"http:\/\/xmlns.jcp.org\/xml\/ns\/persistence http:\/\/xmlns.jcp.org\/xml\/ns\/persistence\/persistence_2_1.xsd\">\r\n \r\n\u00a0 <persistence-unit name=\"AuthorService_1.0PU\" transaction-type=\"JTA\">\r\n \r\n\u00a0 \u00a0 <jta-data-source>java:global\/DerbyDataSource<\/jta-data-source>\r\n \r\n\u00a0 \u00a0 <exclude-unlisted-classes>false<\/exclude-unlisted-classes>\r\n \r\n\u00a0 \u00a0 <properties\/>\r\n \r\n\u00a0 <\/persistence-unit>\r\n \r\n<\/persistence><\/pre>\n
Create a web.xml deployment descriptor for the project.\u00a0 If doing this within NetBeans, simply right-click the project and choose New->Web->”Standard Deployment Descriptor (web.xml) and click Finish.\u00a0 Once the web.xml deployment descriptor has been generated, add the data source to it.<\/p>\n
<web-app xmlns=\"http:\/\/xmlns.jcp.org\/xml\/ns\/javaee\"\r\n\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0xsi:schemaLocation=\"http:\/\/xmlns.jcp.org\/xml\/ns\/javaee http:\/\/xmlns.jcp.org\/xml\/ns\/javaee\/web-app_3_1.xsd\"\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0version=\"3.1\">\r\n \r\n\u00a0 \u00a0 <session-config>\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 <session-timeout>\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 30\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 <\/session-timeout>\r\n \r\n\u00a0 \u00a0 <\/session-config>\r\n\r\n \r\n \r\n<data-source>\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 <name>java:global\/DerbyDataSource<\/name>\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 <class-name>org.apache.derby.jdbc.ClientDriver<\/class-name>\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 <server-name>localhost<\/server-name>\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 <port-number>1527<\/port-number>\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 <url>jdbc:derby:\/\/localhost:1527\/acme<\/url>\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 <user>acmeuser<\/user>\r\n \r\n\u00a0 \u00a0 \u00a0 \u00a0 <password>yourpassword<\/password>\u00a0\r\n \r\n\u00a0 \u00a0 <\/data-source>\r\n\r\n \r\n<\/web-app><\/pre>\n
That’s it for the Java EE application.\u00a0 You should now be able to compile the project into a WAR file and deploy to GlassFish, Payara, or another Java EE application server of your choice.\u00a0 In this case, let’s deploy to Payara Micro.<\/p>\n
To begin, download the latest Payara Micro JAR file from the website:\u00a0https:\/\/www.payara.fish\/payara_micro<\/p>\n
Once downloaded, the server can be started up by opening a command prompt and executing the JAR with your local Java runtime by typing:<\/p>\n
java -jar payara-micro-4.1.2.174.jar<\/pre>\n
To deploy the application (microservice) that we’ve created, simply utilize the –deploy option when executing the Payara Micro JAR, and point it to the SimpleService WAR file:<\/p>\n
java -jar payara-micro-4.1.2.174.jar --deploy SimpleService-1.0.war<\/pre>\n
The SimpleService microservice can now be accessed via the following URL:\u00a0\u00a0http:\/\/localhost:8080\/SimpleService-1.0\/rest\/suggestedNameService<\/p>\n
\n\n\n\n
Published on Java Code Geeks with permission by Josh Juneau, partner at our JCG program<\/a>. See the original article here: Easy Java EE Microservices with Payara Micro<\/a><\/p>\n
Opinions expressed by Java Code Geeks contributors are their own.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Wondering how to get started with Java EE Microservices?\u00a0 It only takes a few quick steps to deploy a Microservice using Java EE APIs.\u00a0 Many think that Java EE is too heavyweight for use with Microservices, but that is simply not the case…especially if you only utilize the Java EE specifications that are required by …<\/p>\n","protected":false},"author":605,"featured_media":112,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[1629],"class_list":["post-70977","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-payara"],"yoast_head":"\nEasy Java EE Microservices with Payara Micro - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Wondering how to get started with Java EE Microservices?\u00a0 It only takes a few quick steps to deploy a Microservice using Java EE APIs.\u00a0 Many think that\" \/>\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\/2017\/11\/easy-java-ee-microservices-payara-micro.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Easy Java EE Microservices with Payara Micro - 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