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/
=== 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
= jump over "Create a JBoss configuration" link since it has been configured at
Task 4 in the last post of this thread.
- on completion of the project named "articles", confirm following point before
proceeding further steps.
= 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)
= if not, change the library location as follow;
= right-click the project "articles" in the Package Explorer.
= then, go to "Properties > Java Build Path > Libraries > JRE System Library >
Edit... > Installed JREs... > Edit..."
= in "Edit JRE" box;
* JRE name --> jdk 1.5
* JRE home directory --> C:\jdk1.5.0_05\jre
= 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 list
of annotations.
- select "@Entity"
= 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".
= 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"
= 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)
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=bb&op=viewtopic&t=66949
Trail 4: Create a Java Servlet
- add "J2EE 1.4Libraries (JBoss-IDE)" and
- create "AuthorServlet.java" as per the trail in Ref. 1
= 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 final
serialVersionUID field of type long"
| AuthorServlet.java articles/src/org/jboss/ejb3demo/web line 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.
/**
| *
| */
| private static final long serialVersionUID = 1L;
= 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 as
per the steps in Ref. 1
- go to URL "http://localhost:8080/authors/authors"; and see the results.
= they might be as follows (error);
HTTP Status 500 -
|
-----------------------------------------------------------------------------------------
| type Exception report
|
| message
| description The server encountered an internal error () that prevented it
from fulfilling
| this request.
|
| exception
| java.lang.reflect.UndeclaredThrowableException
| $Proxy83.addAuthor(Unknown Source)
|
org.jboss.ejb3demo.web.AuthorServlet.createArticles(AuthorServlet.java:57)
| org.jboss.ejb3demo.web.AuthorServlet.doPost(AuthorServlet.java:50)
| javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
| javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
|
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
|
| 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=bb&op=viewtopic&t=69256
In "Articles.java";
| add : import java.io.Serializable;
| change : public class Article {... --> public class Article implements
Serializable {...
|
| In "Author.java";
| add : import java.io.Serializable;
| change : public class Author {... --> public class Author implements
Serializable {...
- then, re-packaging and re-deploy them.
= note1: re-deploy both of .ejb3 and .war files even if revision is one side
only, otherwise the results might not come properly.
= note2: a few repetition might be necessary to get the results. Repeat
un-deploy/re-packaging/re-deploy if no success.
= In "server.log" file, following part seems to be a set of characteristic
messages of ejb3/hibernate in case of normal process.
:
| 2005-11-06 15:31:46,440 DEBUG
[org.jboss.ejb3.entity.ManagedEntityManagerFactory] GETTING NEW ...
| 2005-11-06 15:31:46,440 DEBUG
[org.jboss.ejb3.entity.ManagedEntityManagerFactory] logLived...
| 2005-11-06 15:31:46,440 DEBUG
[org.jboss.ejb3.entity.ManagedEntityManagerFactory] LONG LIVED ...
| 2005-11-06 15:31:46,440 DEBUG [org.hibernate.impl.SessionImpl] opened
session at timestamp: ...
| 2005-11-06 15:31:46,440 DEBUG [org.hibernate.impl.SessionImpl] find: from
Author
| 2005-11-06 15:31:46,440 DEBUG [org.hibernate.engine.QueryParameters] named
parameters: {}
| 2005-11-06 15:31:46,440 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl]
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'
|
| 2005-11-06 15:31:46,450 DEBUG [org.hibernate.hql.ast.ErrorCounter]
throwQueryException() : ...
| 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=1} ...
| 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]
processQuery() : ( SELECT ...
| 2005-11-06 15:31:46,460 DEBUG [org.hibernate.hql.ast.HqlSqlWalker] Derived
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
authorId9_' {FromElement{...
| | \-[SQL_TOKEN] SqlFragment: 'author0_.name as name9_'
| \-[FROM] FromClause: 'from' FromClause{level=1, fromElementCounter=1,
fromElements=1, ...
| \-[FROM_FRAGMENT] FromElement: 'AUTHORS author0_'
FromElement{explicit,not a collection ...
|
| 2005-11-06 15:31:46,470 DEBUG [org.hibernate.hql.ast.ErrorCounter]
throwQueryException() : ...
| 2005-11-06 15:31:46,470 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl]
HQL: from org.jboss...
| 2005-11-06 15:31:46,470 DEBUG [org.hibernate.hql.ast.QueryTranslatorImpl]
SQL: select author0_...
| 2005-11-06 15:31:46,470 DEBUG [org.hibernate.hql.ast.ErrorCounter]
throwQueryException() : ...
| :
= in "HSQL Database Manager", type "select * from ARTICLES" to confirm the
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
= for "AUTHORS";
AUTHORID NAME
| -------------------
| 1 Marshall
| 2 Marshall
| 3 Max
| 4 Max
=== Ref. On completion of the trails, the files are as follow;
Article.java
package org.jboss.ejb3demo;
|
| import java.io.Serializable;
|
| 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;
|
| @Entity
| @Table(name = "ARTICLES")
| public class Article implements Serializable {
|
| /**
| *
| */
| private static final long serialVersionUID = 1L;
|
| private int articleId;
| private String title;
| private String body;
| private Author author;
|
| @Id (generate = GeneratorType.AUTO)
| @Column (name = "articleId")
| public int getArticleId() {
| return articleId;
| }
| public void setArticleId(int articleId) {
| this.articleId = articleId;
| }
|
| @ManyToOne
| @JoinColumn (name = "authorId")
| public Author getAuthor() {
| return author;
| }
| public void setAuthor(Author author) {
| this.author = author;
| }
| public String getBody() {
| return body;
| }
| public void setBody(String body) {
| this.body = body;
| }
| public String getTitle() {
| return title;
| }
| public void setTitle(String title) {
| this.title = title;
| }
| }
Authors.java
package org.jboss.ejb3demo;
|
| import java.util.List;
| import javax.ejb.Remote;
|
| @Remote
| public interface Authors {
| public List<Author> getAllAuthors();
| public Author addAuthor (String name);
| public void addArticle (Author author, String title, String body);
| }
AuthorsBean.java
package org.jboss.ejb3demo;
|
| import javax.ejb.Stateless;
|
| import java.util.ArrayList;
| import java.util.List;
|
| import javax.persistence.EntityManager;
| import javax.persistence.PersistenceContext;
| import javax.persistence.Query;
|
|
| public @Stateless class AuthorsBean implements Authors {
|
| @PersistenceContext
| private EntityManager manager;
|
| public void addArticle(Author author, String title, String body) {
| manager.persist(author);
| author.addArticle(title, body);
| }
|
| public Author addAuthor(String name) {
| Author author = new Author();
| author.setName(name);
| return author;
| }
|
| public List<Author> getAllAuthors() {
| ArrayList<Author> authors = new ArrayList<Author>();
| Query q = manager.createQuery("from Author");
|
| for (Object o : q.getResultList())
| {
| authors.add((Author) o);
| }
| return authors;
| }
| }
Author.java
package org.jboss.ejb3demo;
|
| import java.io.Serializable;
| import java.util.ArrayList;
| import java.util.Collection;
|
| 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;
|
| @Entity
| @Table(name = "AUTHORS")
| public class Author implements Serializable {
|
| /**
| *
| */
| private static final long serialVersionUID = 1L;
|
| private int authorId;
| private String name;
| private Collection<Article> articles;
|
| @OneToMany (cascade = CascadeType.ALL, fetch = FetchType.EAGER,
mappedBy = "author")
| @JoinColumn (name = "authorId")
| public Collection<Article> getArticles() {
| return articles;
| }
|
| public void setArticles(Collection<Article> articles) {
| this.articles = articles;
| }
|
| @Id(generate = GeneratorType.AUTO)
| @Column (name = "authorId")
| public int getAuthorId() {
| return authorId;
| }
|
| public void setAuthorId(int authorId) {
| this.authorId = authorId;
| }
|
| public String getName() {
| return name;
| }
|
| public void setName(String name) {
| this.name = name;
| }
|
| public void addArticle(String title, String body) {
| if (articles == null)
| articles = new ArrayList<Article>();
| Article article = new Article();
| article.setAuthor(this);
| article.setBody(body);
| article.setTitle(title);
| articles.add(article);
| }
| }
AuthorServlet.java
package org.jboss.ejb3demo.web;
|
| import java.io.IOException;
| import java.io.PrintWriter;
|
| 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;
|
| import org.jboss.ejb3demo.Article;
| import org.jboss.ejb3demo.Author;
| import org.jboss.ejb3demo.Authors;
|
| public class AuthorServlet extends HttpServlet {
|
| /**
| *
| */
| private static final long serialVersionUID = 1L;
| private Authors authorsBean;
|
| public void init() throws ServletException {
| try {
| Context context = new InitialContext();
| authorsBean =(Authors)
context.lookup(Authors.class.getName());
| } catch (NamingException e) {
| e.printStackTrace();
| }
| }
|
| protected void doGet(HttpServletRequest req, HttpServletResponse resp)
| throws ServletException, IOException {
| doPost(req, resp);
| }
|
| protected void doPost(HttpServletRequest req, HttpServletResponse resp)
| throws ServletException, IOException {
| String mode = req.getParameter("mode");
|
| if (mode == null)
| mode = "show";
| if (mode.equals("show"))
| {
| showArticles(req, resp);
| }
| else if (mode.equals("create"))
| {
| createArticles(req, resp);
| }
| }
|
| private void createArticles(HttpServletRequest req, HttpServletResponse
resp)
| throws ServletException, IOException
| {
| Author marshall = authorsBean.addAuthor("Marshall");
| Author max = authorsBean.addAuthor("Max");
|
| authorsBean.addArticle(marshall, "marshall's 1st article",
"this is an article");
| authorsBean.addArticle(marshall, "marshall's 2nd article",
"this is also an article");
| authorsBean.addArticle(max, "max's 1st article", "this is
an article");
| authorsBean.addArticle(max, "max's 2nd article", "this is
also an article");
|
| showArticles(req, resp);
| }
|
| private void showArticles(HttpServletRequest req, HttpServletResponse
resp)
| throws ServletException, IOException
| {
| PrintWriter out = resp.getWriter();
|
| for (Author author : authorsBean.getAllAuthors())
| {
| for (Article article : author.getArticles())
| {
| out.println("<b>" + article.getTitle() + "</b>"
+ " by <i>" + author.getName() + "</i><br/>");
| out.println(" " + article.getBody() +
"<br/><br/>");
| }
| }
| out.println("<form method=\"POST\" action=\"authors\">");
| out.println("<input type=\"hidden\" name=\"mode\"
value=\"create\">");
| out.println("<input type=\"submit\" value=\"Create
articles\">");
| out.println("</form>");
| }
| }
web.xml
<?xml version="1.0" encoding="UTF-8"?>
| <web-app version="2.4"
| xmlns="http://java.sun.com/xml/ns/j2ee";
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
| xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd";>
| <servlet>
| <servlet-name>AuthorServlet</servlet-name>
|
<servlet-class>org.jboss.ejb3demo.web.AuthorServlet</servlet-class>
| </servlet>
| <servlet-mapping>
| <servlet-name>AuthorServlet</servlet-name>
| <url-pattern>/authors</url-pattern>
| </servlet-mapping>
| </web-app>
packaging-build.xml
<?xml version="1.0" encoding="UTF-8"?>
| <project name="Packaging Generator" default="_packaging_generation_">
| <target name="_packaging_generation_" depends="N65540,N65557"/>
| <target name="N65540" description="authors-beans.ejb3">
| <jar destfile="authors-beans.ejb3">
| <zipfileset dir="bin" excludes="**/*Servlet.java"/>
| </jar>
| </target>
| <target name="N65557" description="authors.war">
| <jar destfile="authors.war">
| <zipfileset dir="src" prefix="WEB-INF">
| <include name="web.xml"/>
| </zipfileset>
| <zipfileset dir="bin" prefix="WEB-INF/classes" includes="**/*Servlet.java"/>
| </jar>
| </target>
| </project>
jbosszone
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