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[JBoss-user] [Beginners Corner] - Re: Tutorial on JBossIDE EJB3.0 Tools
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From: jbosszone <do-...@jb...> - 2005-11-06 13:49:21
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Post Subject : Tutorial on JBossIDE EJB3.0 Tools
Ref. 1 : JBoss IDE TrailBlazer : Hike 1 - EJB 3.0 Tools
http://trailblazer.demo.jboss.com/IDETrail/
=3D=3D=3D Environment in use;
- Windows XP SP2
- JDK 1.5.0_05
- JBoss AS 4.0.3SP1
- JBoss IDE1.5RC1 + Eclipse 3.1.1
Following notes/findings cover only Task 5 below;
Task 1: Download and install JDK 1.5
Task 2: Install JBoss AS 4.0.3SP1 using the installer
Task 3: Download and install JBoss IDE1.5RC1 and Eclipse3.1.1
Task 4: Configure Eclipse and JBossIDE to control JBoss AS
Task 5: Carry out a tutorial (Ref. 1)
- Ref. 1 contains following trails;
Trail 1: Create an EJB 3.0 Project
Trail 2: Create EJB 3.0 Entity Beans
Trail 3: Create EJB 3.0 Session Beans
Trail 4: Create a Java Servlet
Trail 5: Package an EJB 3.0 Application
Trail 6: Deploy and Debug
Trail 1: Create an EJB 3.0 Project
- follow the trail in Ref. 1
=3D jump over "Create a JBoss configuration" link since it has been configu=
red at Task 4 in the last post of this thread.
- on completion of the project named "articles", confirm following point be=
fore proceeding further steps.
=3D in the Eclipse Package Explorer, the JRE System Library path is to be "=
[jdk 1.5]", not "(C:\)"[jre 1.5.0_05]" (see Task 1. in the last post)
=3D if not, change the library location as follow;
=3D right-click the project "articles" in the Package Explorer.
=3D then, go to "Properties > Java Build Path > Libraries > JRE System Libr=
ary > Edit... > Installed JREs... > Edit..."
=3D in "Edit JRE" box;
* JRE name --> jdk 1.5
* JRE home directory --> C:\jdk1.5.0_05\jre
=3D click "OK"...
Trail 2: Create EJB 3.0 Entity Beans
- create "Article.java" and "Author.java" as per the trail in Ref. 1
- type "@E" then "Ctrl+space" for the code assist, a pop-up menu shows a li=
st of annotations.
- select "@Entity"
=3D note1: If no "@Entity",
* right-click the project "articles" in the Eclipse Package Explorer (left =
top).
* then go to "Properties > Java Build Path > Libraries (tag) > Add External=
JARs..."
* add "ejb3-persistence.jar" under "..\server\all\deploy\ejb3.deployer".
=3D note2: Creation of the class "Author" (in Article.java)
* place the mouse cursor on "Author", then "Ctrl+1" (or right-click "light-=
bulb") to show "Quick Fix"
=3D note3: "Organize Imports" for "Collection" (in Author.java)
* place the mouse cursor on "Collection"
* then "Ctrl+Shift+O" to show "Organize Imports"
* (or right-click "light-bulb", then Quick Fix)=20
Trail 3: Create EJB 3.0 Session Beans
- create "Authors.java" and "AuthorsBean.java" as per the trail in Ref. 1
- in "AuthorsBean.java", use "@PersistenceContext" instead of "@Inject".
Ref.: "A problem with @Injected EntityManager"
http://www.jboss.org/index.html?module=3Dbb&op=3Dviewtopic&t=3D66949
Trail 4: Create a Java Servlet
- add "J2EE 1.4Libraries (JBoss-IDE)" and
- create "AuthorServlet.java" as per the trail in Ref. 1
=3D note1: On completion of the servlet, descriptions in "Problems" tag in =
the Eclipse workbench might show;
Problem : "The serializable class AuthorServlet does not declare a static f=
inal serialVersionUID field of type long"
| AuthorServlet.java=09articles/src/org/jboss/ejb3demo/web=09line xx
* if the problem occur,
* place mouse cursor on "AuthorServlet", then "Ctl+1".
* select and double-click "Add default serial version ID"
* a set of codes below is added at the top and the problem will be gone.
/**
| *=20
| */
| private static final long serialVersionUID =3D 1L;
=3D note2: Apply same process as Note1 to following classes, if necessary;
* class "Article" in "Article.java"
* class "Author" in "Author.java"
Trail 5: Package an EJB 3.0 Application
- as per the steps in Ref. 1
Trail 6: Deploy and Debug
- start "Debug" session to start JBoss AS and deploy .ejb3 and .war files a=
s per the steps in Ref. 1
- go to URL "http://localhost:8080/authors/authors" and see the results.
=3D they might be as follows (error);
HTTP Status 500 -=20
| -----------------------------------------------------------------------=
------------------
| type Exception report
|=20
| message=20
| description The server encountered an internal error () that prevented =
it from fulfilling=20
| this request.
|=20
| exception=20
| java.lang.reflect.UndeclaredThrowableException
| =09$Proxy83.addAuthor(Unknown Source)
| =09org.jboss.ejb3demo.web.AuthorServlet.createArticles(AuthorServlet.ja=
va:57)
| =09org.jboss.ejb3demo.web.AuthorServlet.doPost(AuthorServlet.java:50)
| =09javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
| =09javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
| =09org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderF=
ilter.java:81)
|=20
| note The full stack trace of the root cause is available in the Apache =
Tomcat/5.5 logs.
| -----------------------------------------------------------------------=
-------------------
| Apache Tomcat/5.5
- if so, modify "Articles.java" and "Author.java" (not "Authors.java")
Ref.: "JBoss EJB3.0 tutorial problems and solutions"
http://www.jboss.org/index.html?module=3Dbb&op=3Dviewtopic&t=3D69256
In "Articles.java";
| add : import java.io.Serializable;
| change : public class Article {... --> public class Article implements =
Serializable {...
|=20
| In "Author.java";
| add : import java.io.Serializable;
| change : public class Author {... --> public class Author implements Se=
rializable {...
- then, re-packaging and re-deploy them.
=3D note1: re-deploy both of .ejb3 and .war files even if revision is one s=
ide only, otherwise the results might not come properly.
=3D note2: a few repetition might be necessary to get the results. Repeat u=
n-deploy/re-packaging/re-deploy if no success.
=3D In "server.log" file, following part seems to be a set of characteristi=
c messages of ejb3/hibernate in case of normal process.
:
| 2005-11-06 15:31:46,440 DEBUG [org.jboss.ejb3.entity.ManagedEntityManag=
erFactory] GETTING NEW ...
| 2005-11-06 15:31:46,440 DEBUG [org.jboss.ejb3.entity.ManagedEntityManag=
erFactory] logLived...
| 2005-11-06 15:31:46,440 DEBUG [org.jboss.ejb3.entity.ManagedEntityManag=
erFactory] LONG LIVED ...
| 2005-11-06 15:31:46,440 DEBUG [org.hibernate.impl.SessionImpl] opened s=
ession at timestamp: ...
| 2005-11-06 15:31:46,440 DEBUG [org.hibernate.impl.SessionImpl] find: fr=
om Author
| 2005-11-06 15:31:46,440 DEBUG [org.hibernate.engine.QueryParameters] na=
med parameters: {}
| 2005-11-06 15:31:46,440 DEBUG [org.hibernate.hql.ast.QueryTranslatorImp=
l] parse() - HQL: from ...
| 2005-11-06 15:31:46,450 DEBUG [org.hibernate.hql.ast.AST] --- HQL AST -=
--
| \-[QUERY] 'query'
| \-[SELECT_FROM] 'SELECT_FROM'
| \-[FROM] 'from'
| \-[RANGE] 'RANGE'
| \-[DOT] '.'
| +-[DOT] '.'
| | +-[DOT] '.'
| | | +-[IDENT] 'org'
| | | \-[IDENT] 'jboss'
| | \-[IDENT] 'ejb3demo'
| \-[IDENT] 'Author'
|=20
| 2005-11-06 15:31:46,450 DEBUG [org.hibernate.hql.ast.ErrorCounter] thro=
wQueryException() : ...
| 2005-11-06 15:31:46,460 DEBUG [org.hibernate.hql.antlr.HqlSqlBaseWalker=
] select << begin ...
| 2005-11-06 15:31:46,460 DEBUG [org.hibernate.hql.ast.tree.FromElement] =
FromClause{level=3D1} ...
| 2005-11-06 15:31:46,460 DEBUG [org.hibernate.hql.antlr.HqlSqlBaseWalker=
] select : finishing ...
| 2005-11-06 15:31:46,460 DEBUG [org.hibernate.hql.ast.HqlSqlWalker] proc=
essQuery() : ( SELECT ...
| 2005-11-06 15:31:46,460 DEBUG [org.hibernate.hql.ast.HqlSqlWalker] Deri=
ved SELECT clause created.
| 2005-11-06 15:31:46,460 DEBUG [org.hibernate.hql.ast.util.JoinProcessor=
] Using FROM fragment ...
| 2005-11-06 15:31:46,460 DEBUG [org.hibernate.hql.antlr.HqlSqlBaseWalker=
] select >> end ...
| 2005-11-06 15:31:46,470 DEBUG [org.hibernate.hql.ast.AST] --- SQL AST -=
--
| \-[SELECT] QueryNode: 'SELECT' querySpaces (AUTHORS)
| +-[SELECT_CLAUSE] SelectClause: '{derived select clause}'
| | +-[SELECT_EXPR] SelectExpressionImpl: 'author0_.authorId as auth=
orId9_' {FromElement{...
| | \-[SQL_TOKEN] SqlFragment: 'author0_.name as name9_'
| \-[FROM] FromClause: 'from' FromClause{level=3D1, fromElementCounte=
r=3D1, fromElements=3D1, ...
| \-[FROM_FRAGMENT] FromElement: 'AUTHORS author0_' FromElement{ex=
plicit,not a collection ...
|=20
| 2005-11-06 15:31:46,470 DEBUG [org.hibernate.hql.ast.ErrorCounter] thro=
wQueryException() : ...
| 2005-11-06 15:31:46,470 DEBUG [org.hibernate.hql.ast.QueryTranslatorImp=
l] HQL: from org.jboss...
| 2005-11-06 15:31:46,470 DEBUG [org.hibernate.hql.ast.QueryTranslatorImp=
l] SQL: select author0_...
| 2005-11-06 15:31:46,470 DEBUG [org.hibernate.hql.ast.ErrorCounter] thro=
wQueryException() : ...
| :
=3D in "HSQL Database Manager", type "select * from ARTICLES" to confirm th=
e records.
ARTICLEID TITLE BODY AUTHORID
| --------------------------------------------------------------------
| 1 marshall's 1st article this is an article 1
| 2 marshall's 2nd article this is also article 2
| 3 max's 1st article this is an article 3
| 4 max's 2nd article this is also article 4
=3D for "AUTHORS";
AUTHORID NAME
| -------------------
| 1 Marshall
| 2 Marshall
| 3 Max
| 4 Max
=3D=3D=3D Ref. On completion of the trails, the files are as follow;
Article.java=20
package org.jboss.ejb3demo;
|=20
| import java.io.Serializable;
|=20
| import javax.persistence.Column;
| import javax.persistence.Entity;
| import javax.persistence.GeneratorType;
| import javax.persistence.Id;
| import javax.persistence.JoinColumn;
| import javax.persistence.ManyToOne;
| import javax.persistence.Table;
|=20
| @Entity
| @Table(name =3D "ARTICLES")
| public class Article implements Serializable {
|=20
| =09/**
| =09 *=20
| =09 */
| =09private static final long serialVersionUID =3D 1L;
| =09
| =09private int articleId;
| =09private String title;
| =09private String body;
| =09private Author author;
| =09
| =09@Id (generate =3D GeneratorType.AUTO)
| =09@Column (name =3D "articleId")
| =09public int getArticleId() {
| =09=09return articleId;
| =09}
| =09public void setArticleId(int articleId) {
| =09=09this.articleId =3D articleId;
| =09}
| =09
| =09@ManyToOne
| =09@JoinColumn (name =3D "authorId")
| =09public Author getAuthor() {
| =09=09return author;
| =09}
| =09public void setAuthor(Author author) {
| =09=09this.author =3D author;
| =09}
| =09public String getBody() {
| =09=09return body;
| =09}
| =09public void setBody(String body) {
| =09=09this.body =3D body;
| =09}
| =09public String getTitle() {
| =09=09return title;
| =09}
| =09public void setTitle(String title) {
| =09=09this.title =3D title;
| =09}
| }
Authors.java
package org.jboss.ejb3demo;
|=20
| import java.util.List;
| import javax.ejb.Remote;
|=20
| @Remote
| public interface Authors {
| =09public List<Author> getAllAuthors();
| =09public Author addAuthor (String name);
| =09public void addArticle (Author author, String title, String body);
| }
AuthorsBean.java
package org.jboss.ejb3demo;
|=20
| import javax.ejb.Stateless;
|=20
| import java.util.ArrayList;
| import java.util.List;
|=20
| import javax.persistence.EntityManager;
| import javax.persistence.PersistenceContext;
| import javax.persistence.Query;
|=20
|=20
| public @Stateless class AuthorsBean implements Authors {
|=20
| =09@PersistenceContext
| =09private EntityManager manager;
| =09
| =09public void addArticle(Author author, String title, String body) {
| =09=09manager.persist(author);
| =09=09author.addArticle(title, body);
| =09}
|=20
| =09public Author addAuthor(String name) {
| =09=09Author author =3D new Author();
| =09=09author.setName(name);
| =09=09return author;
| =09}
|=20
| =09public List<Author> getAllAuthors() {
| =09=09ArrayList<Author> authors =3D new ArrayList<Author>();
| =09=09Query q =3D manager.createQuery("from Author");
| =09=09
| =09=09for (Object o : q.getResultList())
| =09=09{
| =09=09=09authors.add((Author) o);
| =09=09}
| =09=09return authors;
| =09}
| }
Author.java
package org.jboss.ejb3demo;
|=20
| import java.io.Serializable;
| import java.util.ArrayList;
| import java.util.Collection;
|=20
| import javax.persistence.CascadeType;
| import javax.persistence.Column;
| import javax.persistence.Entity;
| import javax.persistence.FetchType;
| import javax.persistence.GeneratorType;
| import javax.persistence.Id;
| import javax.persistence.JoinColumn;
| import javax.persistence.OneToMany;
| import javax.persistence.Table;
|=20
| @Entity
| @Table(name =3D "AUTHORS")
| public class Author implements Serializable {
|=20
| =09/**
| =09 *=20
| =09 */
| =09private static final long serialVersionUID =3D 1L;
| =09
| =09private int authorId;
| =09private String name;
| =09private Collection<Article> articles;
| =09
| =09@OneToMany (cascade =3D CascadeType.ALL, fetch =3D FetchType.EAGER, =
mappedBy =3D "author")
| =09@JoinColumn (name =3D "authorId")
| =09public Collection<Article> getArticles() {
| =09=09return articles;
| =09}
|=20
| =09public void setArticles(Collection<Article> articles) {
| =09=09this.articles =3D articles;
| =09}
| =09
| =09@Id(generate =3D GeneratorType.AUTO)
| =09@Column (name =3D "authorId")
| =09public int getAuthorId() {
| =09=09return authorId;
| =09}
|=20
| =09public void setAuthorId(int authorId) {
| =09=09this.authorId =3D authorId;
| =09}
|=20
| =09public String getName() {
| =09=09return name;
| =09}
|=20
| =09public void setName(String name) {
| =09=09this.name =3D name;
| =09}
| =09
| =09public void addArticle(String title, String body) {
| =09=09if (articles =3D=3D null)
| =09=09=09articles =3D new ArrayList<Article>();
| =09=09Article article =3D new Article();
| =09=09article.setAuthor(this);
| =09=09article.setBody(body);
| =09=09article.setTitle(title);
| =09=09articles.add(article);
| =09}
| }
AuthorServlet.java
package org.jboss.ejb3demo.web;
|=20
| import java.io.IOException;
| import java.io.PrintWriter;
|=20
| import javax.naming.Context;
| import javax.naming.InitialContext;
| import javax.naming.NamingException;
| import javax.servlet.ServletException;
| import javax.servlet.http.HttpServlet;
| import javax.servlet.http.HttpServletRequest;
| import javax.servlet.http.HttpServletResponse;
|=20
| import org.jboss.ejb3demo.Article;
| import org.jboss.ejb3demo.Author;
| import org.jboss.ejb3demo.Authors;
|=20
| public class AuthorServlet extends HttpServlet {
|=20
| =09/**
| =09 *=20
| =09 */
| =09private static final long serialVersionUID =3D 1L;
| =09private Authors authorsBean;
| =09
| =09public void init() throws ServletException {
| =09=09try {
| =09=09=09Context context =3D new InitialContext();
| =09=09=09authorsBean =3D(Authors) context.lookup(Authors.class.getName(=
));
| =09=09} catch (NamingException e) {
| =09=09=09e.printStackTrace();
| =09 }
| =09}
| =09
| =09protected void doGet(HttpServletRequest req, HttpServletResponse res=
p)
| =09 throws ServletException, IOException {
| =09=09doPost(req, resp);
| =09}
| =09
| =09protected void doPost(HttpServletRequest req, HttpServletResponse re=
sp)
| =09 throws ServletException, IOException {
| =09=09String mode =3D req.getParameter("mode");
|=20
| =09=09if (mode =3D=3D null)
| =09=09=09mode =3D "show";
| =09=09if (mode.equals("show"))
| =09=09{
| =09=09=09showArticles(req, resp);
| =09=09}
| =09=09else if (mode.equals("create"))
| =09=09{
| =09=09=09createArticles(req, resp);
| =09=09}
| =09}
|=20
| =09private void createArticles(HttpServletRequest req, HttpServletRespo=
nse resp)
| =09=09throws ServletException, IOException
| =09{
| =09=09Author marshall =3D authorsBean.addAuthor("Marshall");
| =09=09Author max =3D authorsBean.addAuthor("Max");
| =09=09
| =09=09authorsBean.addArticle(marshall, "marshall's 1st article", "this =
is an article");
| =09=09authorsBean.addArticle(marshall, "marshall's 2nd article", "this =
is also an article");
| =09=09authorsBean.addArticle(max, "max's 1st article", "this is an=
article");
| =09=09authorsBean.addArticle(max, "max's 2nd article", "this is al=
so an article");
|=20
| =09=09showArticles(req, resp);
| =09}
|=20
| =09private void showArticles(HttpServletRequest req, HttpServletRespons=
e resp)
| =09=09throws ServletException, IOException=09
| =09{
| =09=09PrintWriter out =3D resp.getWriter();
| =09=09
| =09=09for (Author author : authorsBean.getAllAuthors())
| =09=09{
| =09=09=09for (Article article : author.getArticles())
| =09=09=09{
| =09=09=09=09out.println("<b>" + article.getTitle() + "</b>"=09+ " by <i=
>" + author.getName() + "</i><br/>");
| =09=09=09=09out.println("=C2=A0 =C2=A0 " + article.getBody() + "<br/><b=
r/>");
| =09=09=09}
| =09=09}
| =09=09out.println("<form method=3D\"POST\" action=3D\"authors\">");
| =09=09out.println("<input type=3D\"hidden\" name=3D\"mode\" value=3D\"c=
reate\">");
| =09=09out.println("<input type=3D\"submit\" value=3D\"Create articles\"=
>");
| =09=09out.println("</form>");
| =09}
| }
web.xml
<?xml version=3D"1.0" encoding=3D"UTF-8"?>
| <web-app version=3D"2.4"
| =09xmlns=3D"http://java.sun.com/xml/ns/j2ee"
| =09xmlns:xsi=3D"http://www.w3.org/2001/XMLSchema-instance"
| =09xsi:schemaLocation=3D"http://java.sun.com/xml/ns/j2ee http://java.su=
n.com/xml/ns/j2ee/web-app_2_4.xsd">
| =09<servlet>
| =09=09<servlet-name>AuthorServlet</servlet-name>
| =09=09<servlet-class>org.jboss.ejb3demo.web.AuthorServlet</servlet-clas=
s>
| =09</servlet>
| =09<servlet-mapping>
| =09=09<servlet-name>AuthorServlet</servlet-name>
| =09=09<url-pattern>/authors</url-pattern>
| =09</servlet-mapping>
| </web-app>
packaging-build.xml
<?xml version=3D"1.0" encoding=3D"UTF-8"?>
| <project name=3D"Packaging Generator" default=3D"_packaging_generation_=
">
| <target name=3D"_packaging_generation_" depends=3D"N65540,N65557"/>
| <target name=3D"N65540" description=3D"authors-beans.ejb3">
| <jar destfile=3D"authors-beans.ejb3">
| <zipfileset dir=3D"bin" excludes=3D"**/*Servlet.java"/>
| </jar>
| </target>
| <target name=3D"N65557" description=3D"authors.war">
| <jar destfile=3D"authors.war">
| <zipfileset dir=3D"src" prefix=3D"WEB-INF">
| <include name=3D"web.xml"/>
| </zipfileset>
| <zipfileset dir=3D"bin" prefix=3D"WEB-INF/classes" includes=3D"**/*Serv=
let.java"/>
| </jar>
| </target>
| </project>
jbosszone
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