RESTication of Openxava App and Vaadin Client
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Join For FreeThe purpose of this article is to provide REST interface for Openxava (OX) application.
It shows how-to
- integrate jersey engine into the OX build
- extend the JPA2 entities with JAXB and JAXRS annotations
- write a little UC with methods that returns xml/json message
- test it
- Make a sample Vaadin client application for those REST services
Integrate Jersey engine in OX build
Jersey lib integration
Add the following libraries in your project /web/WEB-INF/lib
- jsr305-1.3.2.jar
- jersey-core-1.9-ea03.jar
- jersey-server-1.9-ea03.jar
- asm-3.1.jar (although asm.jar is shipped with OX this version is to used)
Here the dependency is on jersey-server-1.9-ea03
In your OX project add the file servlets.xml into /web/WEB-INF
<servlet> <servlet-name>petshop Jersey Web Application</servlet-name> <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class> <init-param> <param-name>com.sun.jersey.config.property.resourceConfigClass</param-name> <param-value>com.sun.jersey.api.core.PackagesResourceConfig</param-value> </init-param> <init-param> <param-name>com.sun.jersey.config.property.packages</param-name> <param-value>my.cool.report</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>petshop Jersey Web Application</servlet-name> <url-pattern>/rest/*</url-pattern> </servlet-mapping>
Openxava build takes what you define in servlets.xml file and insert it in the web.xml
The snippet above specifies the following:
- Jersey engine will parse the package for JAXRS annotation in the package "my.cool.report"
- the context path used for REST will be /rest/*
JAXB & JAXRS integration
Add Jaxb and Jaxrs annotation in OX jpa2 entities
Class MyConferenceCoolReport
package my.cool.report.conference.domain.report; import java.sql.*; import java.util.Date; import java.util.List; import java.util.ArrayList; import java.util.Set; import java.util.HashSet; import javax.persistence.*; import javax.ws.rs.*; import javax.ws.rs.core.*; import javax.xml.bind.annotation.*; import my.cool.report.conference.dto.report.*; import org.openxava.annotations.*; import org.openxava.jpa.*; /** * * <p>Title: MyConferenceCoolReport</p> * * <p>Description: Domain Object describing a MyConferenceCoolReport entity</p> * */ @Entity (name="MyConferenceCoolReport") @Table (name="my_conference_cool_report") @Views({ @View( name="base", members= "" + "firstName ; " + "lastName ; " + "email ; " + "status ; " + "addressStreet1 ; " + "addressStreet2 ; " + "countryCode ; " + "conferenceName ; " + "conferenceBeginDate ; " + "conferenceEndDate ; " ), @View( name="Create", extendsView="base" ), @View( name="Update", extendsView="base", members= "" ), @View(extendsView="base", members= "" ), @View(name="myConferenceCoolReportDEFAULT_VIEW", members= " id ;" + "firstName ; " + "lastName ; " + "email ; " + "status ; " + "addressStreet1 ; " + "addressStreet2 ; " + "countryCode ; " + "conferenceName ; " + "conferenceBeginDate ; " + "conferenceEndDate ; " ) }) @Tabs({ @Tab( properties= " firstName " +", lastName " +", email " +", status " +", addressStreet1 " +", addressStreet2 " +", countryCode " +", conferenceName " +", conferenceBeginDate " +", conferenceEndDate " ) , @Tab( name = "MyConferenceCoolReportTab", properties= " firstName " +", lastName " +", email " +", status " +", addressStreet1 " +", addressStreet2 " +", countryCode " +", conferenceName " +", conferenceBeginDate " +", conferenceEndDate " ) , @Tab( name = "MyConferenceCoolReportTabWithRef", properties= " firstName " +", lastName " +", email " +", status " +", addressStreet1 " +", addressStreet2 " +", countryCode " +", conferenceName " +", conferenceBeginDate " +", conferenceEndDate " ) }) @XmlAccessorType(XmlAccessType.FIELD) @XmlType @XmlRootElement @Path ("/myreports") public class MyConferenceCoolReport { @Hidden @Id @Column(name="id" ) private Long id; @Column(name="first_name", length=255, nullable=false, unique=false) @Required private String firstName; @Column(name="last_name", length=255, nullable=false, unique=false) @Required private String lastName; @Column(name="email", length=255, nullable=false, unique=false) @Required private String email; @Column(name="status", length=45, nullable=false, unique=false) @Required private String status; @Column(name="address_street1", length=255, nullable=true, unique=false) private String addressStreet1; @Column(name="address_street2", length=255, nullable=true, unique=false) private String addressStreet2; @Column(name="country_code", length=45, nullable=false, unique=false) @Required private String countryCode; @Column(name="conference_name", length=255, nullable=false, unique=false) @Required private String conferenceName; @Column(name="conference_begin_date", nullable=true, unique=false) private Date conferenceBeginDate; @Column(name="conference_end_date", nullable=true, unique=false) private Date conferenceEndDate; /** * Default constructor */ public MyConferenceCoolReport() { } public Long getId() { return id; } public void setId (Long id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName (String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName (String lastName) { this.lastName = lastName; } public String getEmail() { return email; } public void setEmail (String email) { this.email = email; } public String getStatus() { return status; } public void setStatus (String status) { this.status = status; } public String getAddressStreet1() { return addressStreet1; } public void setAddressStreet1 (String addressStreet1) { this.addressStreet1 = addressStreet1; } public String getAddressStreet2() { return addressStreet2; } public void setAddressStreet2 (String addressStreet2) { this.addressStreet2 = addressStreet2; } public String getCountryCode() { return countryCode; } public void setCountryCode (String countryCode) { this.countryCode = countryCode; } public String getConferenceName() { return conferenceName; } public void setConferenceName (String conferenceName) { this.conferenceName = conferenceName; } public Date getConferenceBeginDate() { return conferenceBeginDate; } public void setConferenceBeginDate (Date conferenceBeginDate) { this.conferenceBeginDate = conferenceBeginDate; } public Date getConferenceEndDate() { return conferenceEndDate; } public void setConferenceEndDate (Date conferenceEndDate) { this.conferenceEndDate = conferenceEndDate; } @Transient @GET @Path("{reportId}") @Produces ({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON}) public MyConferenceCoolReport findById (@PathParam ("reportId") Long reportId) { EntityManager em = XPersistence.getManager(); MyConferenceCoolReport p = em.find(MyConferenceCoolReport.class, reportId); return p; } @Transient @GET @QueryParam("{countryCode}") @Produces ({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON}) public MyConfReports find (@QueryParam ("countryCode") String countryCode) { String q = null; EntityManager em = XPersistence.getManager(); if (countryCode!=null) { q = "select m from MyConferenceCoolReport m where countryCode = '"+countryCode+"'"; } else q = "select m from MyConferenceCoolReport m "; Query query = em.createQuery(q); List<myconferencecoolreport> l = query.getResultList(); MyConfReports m = new MyConfReports(); m.setMyCoolReport(l); return m; } }
Annotation of entities
The
previous snippet indicates that entity MyConferenceCoolReport contains a
transient method (findById) use for REST GET operation and using the
param reportId to load an entity. It can be returned either as Xml or in
a Json format.
It contains also a method find that takes a parameter a country code and return a DTO based on the class MyConfReports
package my.cool.report.conference.dto.report; package my.cool.report.conference.dto.report; import java.util.*; import javax.xml.bind.annotation.*; import my.cool.report.conference.domain.report.*; @XmlAccessorType(XmlAccessType.FIELD) @XmlType @XmlRootElement public class MyConfReports { private List<MyConferenceCoolReport> myCoolReport; public MyConfReports () { } public List<MyConferenceCoolReport> getMyCoolReport() { return myCoolReport; } public void setMyCoolReport(List<MyConferenceCoolReport> myCoolReport) { this.myCoolReport = myCoolReport; } }
Deploy
Use the ant build on your project.
Remark: do not forget when using openxava with eclipse to set "Build Automatically" on the "Project" tab.
Testing
Via the browser type
http://localhost:8080/conference/rest/myreports?countryCode=BE to see all the
http://localhost:8080/conference/rest/myreports/ it returns in an XML format.
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