I'm new to EJB/ Java EE, trying to do an example referring this tutorial.
I've deployed the ojdbc8.jar to JBOSS and created a JNDI/datasources, I couldn't succeed in doing it manually updating standalone.xml, module and all, however from server logs it appears that data source is working correctly, but somehow EntityManager is not getting injected by @PersistenceContext getting java.lang.NullPointerException, don't know where it is going wrong, can anyone please help?
Toolkit:
IDE : NetBeans 12 Server : Wildfly 8.2
Configuration file of Wildfly is standalone-full.xml
persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="EjbCompPersistPU" transaction-type="JTA">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<jta-data-source>java:/jdbc/datasources/ejbcomppersist</jta-data-source>
<class>com.tanmshar.ejbcomppersistsrvr.Books</class>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.format_sql" value="true"/>
</properties>
</persistence-unit>
</persistence>
EjbSBPersistStatelessLocal.java
@Local
public interface EjbSBPersistStatelessLocal {
public String printHelloWorld(String str);
void addBook(String bookName, String bookAuthor);
List getBooks();
}
EjbSBPersistStateless.java
@Stateless
public class EjbSBPersistStateless implements EjbSBPersistStatelessLocal {
@PersistenceContext(unitName="EjbCompPersistPU")
private EntityManager entityManager;
@Override
public String printHelloWorld(String str){
System.out.println("Hello World from EjbSBStatelessLocal "+str);
return "Hello World from EjbSBStatelessLocal "+str;
}
@Override
public void addBook(String bookName, String bookAuthor){
//bookShelf.add(new Books(bookName,bookAuthor));
Books book = new Books();
book.setBookName(bookName);
book.setBookAuthor(bookAuthor);
System.out.println(org.hibernate.Version.getVersionString());
System.out.println(book.getBookId()+" "+book.getBookName()+" "+book.getBookAuthor());
System.out.println("entityManager: "+ entityManager);
entityManager.persist(book);
System.out.println("EM done!");
}
......
}
Books.java
@Entity
@Table(name="books")
public class Books implements Serializable{
@Id
@GeneratedValue(strategy= GenerationType.IDENTITY)
@Column(name="bookId")
private long bookId;
@Column(name="bookName")
private String bookName;
@Column(name="bookAuthor")
private String bookAuthor;
.....
}
Application deploy logs from server
19:41:22,716 INFO [org.jboss.as.server.deployment.scanner] (DeploymentScanner-threads - 2) JBAS015003: Found EjbCompPersistSrvr-1.0-SNAPSHOT.jar in deployment directory. To trigger deployment create a file called EjbCompPersistSrvr-1.0-SNAPSHOT.jar.dodeploy
19:41:37,769 INFO [org.jboss.as.server.deployment] (MSC service thread 1-3) JBAS015876: Starting deployment of "EjbCompPersistSrvr-1.0-SNAPSHOT.jar" (runtime-name: "EjbCompPersistSrvr-1.0-SNAPSHOT.jar")
19:41:37,788 INFO [org.jboss.as.jpa] (MSC service thread 1-5) JBAS011401: Read persistence.xml for EjbCompPersistPU
19:41:37,807 INFO [org.jboss.as.jpa] (ServerService Thread Pool -- 86) JBAS011409: Starting Persistence Unit (phase 1 of 2) Service 'EjbCompPersistSrvr-1.0-SNAPSHOT.jar#EjbCompPersistPU'
19:41:37,807 INFO [org.hibernate.jpa.internal.util.LogHelper] (ServerService Thread Pool -- 86) HHH000204: Processing PersistenceUnitInfo [
name: EjbCompPersistPU
...]
19:41:37,828 INFO [org.jboss.weld.deployer] (MSC service thread 1-1) JBAS016002: Processing weld deployment EjbCompPersistSrvr-1.0-SNAPSHOT.jar
19:41:37,844 INFO [org.jboss.as.ejb3.deployment.processors.EjbJndiBindingsDeploymentUnitProcessor] (MSC service thread 1-1) JNDI bindings for session bean named EjbSBPersistStateless in deployment unit deployment "EjbCompPersistSrvr-1.0-SNAPSHOT.jar" are as follows:
java:global/EjbCompPersistSrvr-1.0-SNAPSHOT/EjbSBPersistStateless!com.tanmshar.ejbcomppersistsrvr.EjbSBPersistStatelessLocal
java:app/EjbCompPersistSrvr-1.0-SNAPSHOT/EjbSBPersistStateless!com.tanmshar.ejbcomppersistsrvr.EjbSBPersistStatelessLocal
java:module/EjbSBPersistStateless!com.tanmshar.ejbcomppersistsrvr.EjbSBPersistStatelessLocal
java:global/EjbCompPersistSrvr-1.0-SNAPSHOT/EjbSBPersistStateless
java:app/EjbCompPersistSrvr-1.0-SNAPSHOT/EjbSBPersistStateless
java:module/EjbSBPersistStateless
19:41:37,856 INFO [org.jboss.weld.deployer] (MSC service thread 1-3) JBAS016005: Starting Services for CDI deployment: EjbCompPersistSrvr-1.0-SNAPSHOT.jar
19:41:37,859 INFO [org.jboss.weld.deployer] (MSC service thread 1-1) JBAS016008: Starting weld service for deployment EjbCompPersistSrvr-1.0-SNAPSHOT.jar
19:41:37,865 INFO [org.jboss.as.jpa] (ServerService Thread Pool -- 86) JBAS011409: Starting Persistence Unit (phase 2 of 2) Service 'EjbCompPersistSrvr-1.0-SNAPSHOT.jar#EjbCompPersistPU'
19:41:37,876 INFO [org.hibernate.dialect.Dialect] (ServerService Thread Pool -- 86) HHH000400: Using dialect: org.hibernate.dialect.Oracle10gDialect
19:41:37,882 INFO [org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory] (ServerService Thread Pool -- 86) HHH000397: Using ASTQueryTranslatorFactory
19:41:37,896 INFO [org.hibernate.tool.hbm2ddl.SchemaUpdate] (ServerService Thread Pool -- 86) HHH000228: Running hbm2ddl schema update
19:41:37,896 INFO [org.hibernate.tool.hbm2ddl.SchemaUpdate] (ServerService Thread Pool -- 86) HHH000102: Fetching database metadata
19:41:38,376 INFO [org.hibernate.tool.hbm2ddl.SchemaUpdate] (ServerService Thread Pool -- 86) HHH000396: Updating schema
19:41:38,570 INFO [org.hibernate.tool.hbm2ddl.TableMetadata] (ServerService Thread Pool -- 86) HHH000261: Table found: MYSPACE.BOOKS
19:41:38,570 INFO [org.hibernate.tool.hbm2ddl.TableMetadata] (ServerService Thread Pool -- 86) HHH000037: Columns: [bookauthor, bookname, bookid]
19:41:38,570 INFO [org.hibernate.tool.hbm2ddl.TableMetadata] (ServerService Thread Pool -- 86) HHH000108: Foreign keys: []
19:41:38,570 INFO [org.hibernate.tool.hbm2ddl.TableMetadata] (ServerService Thread Pool -- 86) HHH000126: Indexes: [sys_c008055]
19:41:38,571 INFO [org.hibernate.tool.hbm2ddl.SchemaUpdate] (ServerService Thread Pool -- 86) HHH000232: Schema update complete
19:41:38,658 INFO [org.jboss.as.server] (DeploymentScanner-threads - 1) JBAS018559: Deployed "EjbCompPersistSrvr-1.0-SNAPSHOT.jar" (runtime-name : "EjbCompPersistSrvr-1.0-SNAPSHOT.jar")
Client side NullPointerException stack trace
**********************
Welcome to Book Store
**********************
Options
1. Add Book
2. Exit
Enter Choice: 1
Harry Potter
4.3.7.Final
0 Harry Potter JK
entityManager: null
java.lang.NullPointerException
at com.tanmshar.ejbcomppersistsrvr.EjbSBPersistStateless.addBook (EjbSBPersistStateless.java:39)
at com.tanmshar.ejbcomppersistclient.EjbPersistLibrary.ejbLibraryFunction (EjbPersistLibrary.java:63)
at com.tanmshar.ejbcomppersistclient.Main.main (Main.java:24)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:254)
at java.lang.Thread.run (Thread.java:748)
------------------------------------------------------------------------
BUILD FAILURE
Update -1:
Client side code EjbPersistLibrary.java
calling this from main method
EjbPersistLibrary ejbLibrary = new EjbPersistLibrary();
ejbLibrary.ejbLibraryFunction();
public class EjbPersistLibrary {
@EJB
private EjbSBPersistStatelessLocal stateLessLocalBean;
private BufferedReader brConsoleReader;
public EjbPersistLibrary() {
stateLessLocalBean= new EjbSBPersistStateless();
try{
brConsoleReader = new BufferedReader(new InputStreamReader(System.in));
}catch(Exception e){
System.out.println("Message "+e.getMessage());
}
}
public void ejbLibraryFunction() {
int choice=1;
String strChoice, bookName;
try{
while(choice !=2){
showGUI();
strChoice = brConsoleReader.readLine();
choice = Integer.parseInt(strChoice);
if(choice==1){
bookName = brConsoleReader.readLine();
stateLessLocalBean.addBook(bookName, "JK");
}else
{break;}
}
if(brConsoleReader!=null)
{brConsoleReader.close();}
}catch(IOException ioe)
{ioe.printStackTrace();}
