Error: Injection on field eManager of instance EmployeeServicesBean failed

Question

Hi all,
I have access to the customers NW CE 7.1 SP07 and of course I am using the corresponding NWDS 7.1 SP07 that comes with this CE installation. I am trying to study JEE 5 @ SAP and I have created a very simple Application (from the Book http://www.sap-press.de/katalog/buecher/titel/gp/titelID-1480).
In NWDS I have created the following 4 projects:
1. Dictionary Project
Describes 2 Tables (TMP_EMPLOYEES and TMP_ID_GEN)
I could easily deploy it (but on which DataSource are the Tables created? Where do I have to define this??)
2. EJB 5 Project
Contains a stateless EJB + local business interface + Entity class.
The EJB accesses the entity class, which is mapped to a simple table (TMP_EMPLOYEES).
3. Dynamic Web Project
Contains actually only one JSP (index.jsp) which allows to the local business interface for creating a new Entity.
4. Enterprise Application Project (EAR)
Creates a package from 2. and 3. Also includes a self defined data-source-aliases.xml
I have successfully deployed both the Dictionary Project and the EAR (all to the same server).
But If I call the corresponding URL via web browser I get the following error:
Processing HTTP request to servlet [jsp] finished with error.
The error is: javax.ejb.EJBException: Exception in getMethodReady() for stateless
bean sap.com/EmployeeEar*annotation|EmployeeEjb.jar*annotation|EmployeeServicesBean; nested exception is:
com.sap.engine.services.ejb3.util.pool.PoolException: javax.ejb.EJBException: Cannot perform injection over bean
instance com.sap.demo.session.EmployeeServicesBean@298de4eb for bean
sap.com/EmployeeEar*annotation|EmployeeEjb.jar*annotation|EmployeeServicesBean;
nested exception is: com.sap.engine.lib.injection.InjectionException: Injection on field eManager of instance com.sap.demo.session.EmployeeServicesBean@298de4eb failed.
Could not get a value to be injected from the factory.00505684110800290000009000000B180139C8D8862D3E88
I guess I have some buggy "configuration" somewhere. Here is my code:
Stateless EJB: EmployeeServicesBean ###
package com.sap.demo.session;
import java.util.List;
import javax.ejb.Stateless;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.ejb.TransactionManagement;
import javax.ejb.TransactionManagementType;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import com.sap.demo.entity.Employee;
@Stateless
@TransactionManagement(value=TransactionManagementType.CONTAINER)
public class EmployeeServicesBean implements EmployeeServicesLocal {
        //ATTENTION: it seems the error occurs here, because "eManager" can't be filled :-(
     @PersistenceContext(unitName="EmployeePU_NZA")
     private EntityManager eManager;
     public long createEmployee(String lastName, String firstName, String department){
          long result = 0;
          Employee emp = new Employee();
          emp.setFirstName(firstName);
          emp.setLastName(lastName);
          emp.setDepartment(department);
          eManager.persist(emp);
          result = emp.getEmployeeId();
          return result;
     @TransactionAttribute(TransactionAttributeType.SUPPORTS)
     public Employee getEmployeeById(long id){
          Employee emp = eManager.find(Employee.class, id);
          return emp;
     @SuppressWarnings("unchecked")
     @TransactionAttribute(TransactionAttributeType.SUPPORTS)
     public List<Employee> getAllEmployees(){
          Query query = eManager.createNamedQuery("Employee.findAll");
          List<Employee> res = (List<Employee>)query.getResultList();
          return res;
persistence.xml ###
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns:persistence="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence persistence_1_0.xsd ">
     <persistence-unit name="EmployeePU_NZA">
          <jta-data-source>TMP_NZA_EMPLOYEES_DATA</jta-data-source>
          <properties>
               <property name="com.sap.engine.services.orpersistence.generator.versiontablename" value="TMP_ID_GEN" />               
          </properties>
     </persistence-unit>
</persistence>
data-source-aliases.xml ###
<?xml version="1.0" encoding="UTF-8"?>
<data-source-aliases xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="data-source-aliases.xsd">
  <aliases>
    <data-source-name>${com.sap.datasource.default}</data-source-name>
    <alias>TMP_NZA_EMPLOYEES_DATA</alias>
  </aliases>
</data-source-aliases>
Entity class: Employee ###
package com.sap.demo.entity;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.TableGenerator;
import javax.persistence.Version;
@NamedQuery(name="Employee.findAll", query="SELECT e FROM Employee AS e")
@Entity
@Table(name="TMP_EMPLOYEES")
@TableGenerator(name="idGenerator", table="TMP_ID_GEN", pkColumnName="GEN_KEY", valueColumnName="GEN_VALUE")
public class Employee implements Serializable{
     private static final long serialVersionUID = 111l;
     @Id
     @GeneratedValue(strategy=GenerationType.TABLE, generator="idGenerator")
     @Column(name="ID")     
     private long employeeId;
     @Column(name="LAST_NAME")
     private String lastName;
     @Column(name="FIRST_NAME")
     private String firstName;
     private String department;
     @Version
     private int version;
     public Employee(){
     //getters and setters...
data-source-aliases.xml of Enterprise Application Project ###
<?xml version="1.0" encoding="UTF-8"?>
<data-source-aliases xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="data-source-aliases.xsd">
  <aliases>
    <data-source-name>${com.sap.datasource.default}</data-source-name>
    <alias>TMP_NZA_EMPLOYEES_DATA</alias>
  </aliases>
</data-source-aliases>
Who can see my problem? I have been trying for the last 3 days to find the problem
Thanks!!!

Answer 1

But now I have other issue, or maybe even the same:
In the log Viewer of my nwa I see the 4 errors occuring in the following chronological order:
1.
Exception of type com.sap.sql.log.OpenSQLException caught:
The SQL statement "SELECT "GEN_VALUE" FROM "TMP_ID_GEN" WHERE "GEN_KEY" = ? FOR UPDATE" contains the semantics error[s]: - 1:8 - the column >>GEN_VALUE<< is undefined in the current scope
2.
System exception 
[EXCEPTION]
javax.ejb.EJBException: Exception in getMethodReady() for stateless bean sap.com/EmployeeEar*annotation|EmployeeEjb.jar*annotation|EmployeeServicesBean; nested exception is: com.sap.engine.services.ejb3.util.pool.PoolException: javax.ejb.EJBException: Cannot perform injection over bean instance com.sap.demo.session.EmployeeServicesBean@25f56eb4 for bean sap.com/EmployeeEar*annotation|EmployeeEjb.jar*annotation|EmployeeServicesBean; nested exception is: com.sap.engine.lib.injection.InjectionException: Injection on field eManager of instance com.sap.demo.session.EmployeeServicesBean@25f56eb4 failed. Could not get a value to be injected from the factory.
com.sap.engine.services.ejb3.util.pool.PoolException: javax.ejb.EJBException: Cannot perform injection over bean instance com.sap.demo.session.EmployeeServicesBean@25f56eb4 for bean sap.com/EmployeeEar*annotation|EmployeeEjb.jar*annotation|EmployeeServicesBean; nested exception is: com.sap.engine.lib.injection.InjectionException: Injection on field eManager of instance com.sap.demo.session.EmployeeServicesBean@25f56eb4 failed. Could not get a value to be injected from the factory.
at com.sap.engine.services.ejb3.util.pool.ContainerPool.translate(ContainerPool.java:288)
at com.sap.engine.services.ejb3.util.pool.ContainerPoolImpl.doResizeOneStepUp(ContainerPoolImpl.java:378)
at com.sap.engine.services.ejb3.util.pool.ContainerPoolImpl.ensureNotEmpty(ContainerPoolImpl.java:342)
at com.sap.engine.services.ejb3.util.pool.ContainerPoolImpl.pop(ContainerPoolImpl.java:309)
at com.sap.engine.services.ejb3.runtime.impl.StatelessInstanceLifecycleManager.getMethodReady(StatelessInstanceLifecycleManager.java:64)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_StatelessInstanceGetter.invoke(Interceptors_StatelessInstanceGetter.java:14)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_SecurityCheck.invoke(Interceptors_SecurityCheck.java:21)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.Interceptors_ExceptionTracer.invoke(Interceptors_ExceptionTracer.java:16)
at com.sap.engine.services.ejb3.runtime.impl.AbstractInvocationContext.proceed(AbstractInvocationContext.java:177)
at com.sap.engine.services.ejb3.runtime.impl.DefaultInvocationChainsManager.startChain(DefaultInvocationChainsManager.java:133)
at com.sap.engine.services.ejb3.runtime.impl.DefaultEJBProxyInvocationHandler.invoke(DefaultEJBProxyInvocationHandler.java:164)
at $Proxy1675.createEmployee(Unknown Source)
at JEE_jsp_index_8832250_1231951553946_1231951588930._jspService(JEE_jsp_index_8832250_1231951553946_1231951588930.java:123)
at com.sap.engine.services.servlets_jsp.lib.jspruntime.JspBase.service(JspBase.java:102)
//and many more
3.
Processing HTTP request to servlet [jsp] finished with error. The error is: javax.ejb.EJBException: Exception in getMethodReady() for stateless bean sap.com/EmployeeEar*annotation|EmployeeEjb.jar*annotation|EmployeeServicesBean; nested exception is: com.sap.engine.services.ejb3.util.pool.PoolException: javax.ejb.EJBException: Cannot perform injection over bean instance com.sap.demo.session.EmployeeServicesBean@25f56eb4 for bean sap.com/EmployeeEar*annotation|EmployeeEjb.jar*annotation|EmployeeServicesBean; nested exception is: com.sap.engine.lib.injection.InjectionException: Injection on field eManager of instance com.sap.demo.session.EmployeeServicesBean@25f56eb4 failed. Could not get a value to be injected from the factory.
com.sap.engine.services.ejb3.util.pool.PoolException: javax.ejb.EJBException: Cannot perform injection over bean instance com.sap.demo.session.EmployeeServicesBean@25f56eb4 for bean sap.com/EmployeeEar*annotation|EmployeeEjb.jar*annotation|EmployeeServicesBean; nested exception is: com.sap.engine.lib.injection.InjectionException: Injection on field eManager of instance com.sap.demo.session.EmployeeServicesBean@25f56eb4 failed. Could not get a value to be injected from the factory.
at com.sap.engine.services.ejb3.util.pool.ContainerPool.translate(ContainerPool.java:288)
at com.sap.engine.services.ejb3.util.pool.ContainerPoolImpl.doResizeOneStepUp(ContainerPoolImpl.java:378)
at com.sap.engine.services.ejb3.util.pool.ContainerPoolImpl.ensureNotEmpty(ContainerPoolImpl.java:342)
at com.sap.engine.services.ejb3.util.pool.ContainerPoolImpl.pop(ContainerPoolImpl.java:309)
at com.sap.engine.services.ejb3.runtime.impl.StatelessInstanceLifecycleManager.getMethodReady(StatelessInstanceLifecycleManager.java:64)
//and many more
4.
Processing HTTP request to servlet [jsp] finished with error.
The error is: javax.ejb.EJBException: Exception in getMethodReady() for stateless bean sap.com/EmployeeEar*annotation|EmployeeEjb.jar*annotation|EmployeeServicesBean; nested exception is: com.sap.engine.services.ejb3.util.pool.PoolException: javax.ejb.EJBException: Cannot perform injection over bean instance com.sap.demo.session.EmployeeServicesBean@25f56eb4 for bean sap.com/EmployeeEar*annotation|EmployeeEjb.jar*annotation|EmployeeServicesBean; nested exception is: com.sap.engine.lib.injection.InjectionException: Injection on field eManager of instance com.sap.demo.session.EmployeeServicesBean@25f56eb4 failed. Could not get a value to be injected from the factory.0050568411080026000000B500000B180139C8D8862D3408
Who understands these error logs?
Why it says
"SELECT "GEN_VALUE" FROM "TMP_ID_GEN" WHERE "GEN_KEY" = ? FOR UPDATE" contains the semantics error
although I have corrected this already (see previous post) and deployed plenty of times???
I mus have some other stupid bug somewhere, but I can't find it. That really drives me crazy...