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Re: Services with missing/unavailable dependencies EntityManager
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created by <a href="http://community.jboss.org/people/yvette_white">Evie White</a> in <i>JBoss AS7 Development</i> - <a href="http://community.jboss.org/message/619950#619950">View the full discussion</a>
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<div class="jive-rendered-content"><p>Scott & Raphael,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I know what is happening in my situation. In short, I am receiving a "<strong>org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags</strong>" error. Based on some research and then verification, I have found that this is a Hibernate issue that results from using a FetchType.EAGER on a @OneToMany entity attribute where the attribute is a <strong>List</strong> collection. To fix the issue, there are two things that can be done: 1) do not use FetchType.EAGER (use the default of LAZY) or 2) use a Set as the collection type for the @OneToMany instead of a List.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I will provide sample code below that will demonstrate the problem.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>1. "TestDomain" - An Entity object that contains <span style="text-decoration: underline;">two</span> collections. Both are @OneToMany that use an EAGER fetch strategy and are contained in List collections. (This is the problem: can't use EAGER or can't use List; use Set, for example.)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">package foo.domain;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import java.util.List;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.CascadeType;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.Column;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.Entity;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.FetchType;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.GeneratedValue;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.GenerationType;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.Id;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.OneToMany;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.Table;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">@Entity</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">@Table(name="test")</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">public class TestDomain {</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @Id</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @GeneratedValue(strategy=GenerationType.IDENTITY)</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @Column(name="id")</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   private Long id;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @Column(name="name", length=255, nullable=false)</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   private String name;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @OneToMany(cascade={CascadeType.REMOVE}, fetch=<span style="color: #800000;">FetchType.EAGER</span>, mappedBy="test")</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   private <span style="color: #800000;">List</span><TestCommentDomain> comments;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @OneToMany(cascade={CascadeType.REMOVE}, fetch=<span style="color: #800000;">FetchType.EAGER</span>, mappedBy="test")</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   private <span style="color: #800000;">List</span><TestPersonDomain> persons;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public Long getId() {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      return id;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public void ListId(Long id) {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      this.id = id;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public String getName() {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      return name;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public void ListName(String name) {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      this.name = name;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public List<TestCommentDomain> getComments() {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      return comments;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public void ListComments(List<TestCommentDomain> comments) {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      this.comments = comments;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public List<TestPersonDomain> getPersons() {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      return persons;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public void ListPersons(List<TestPersonDomain> persons) {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      this.persons = persons;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">}</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>2. "TestCommentDomain" - An Entity object that is referenced by "TestDomain"</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">package foo.domain;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.Column;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.Entity;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.GeneratedValue;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.GenerationType;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.Id;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.JoinColumn;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.ManyToOne;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.Table;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">@Entity</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">@Table(name="test_comment")</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">public class TestCommentDomain {</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @Id</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @GeneratedValue(strategy=GenerationType.IDENTITY)</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @Column(name="id")</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   private Long id;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @ManyToOne(optional=false)</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @JoinColumn(name="test_id", nullable=false)</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   private TestDomain test;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @Column(name="comment", nullable=false)</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   private String comment;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public Long getId() {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      return id;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public void setId(Long id) {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      this.id = id;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public TestDomain getTest() {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      return test;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public void setTest(TestDomain test) {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      this.test = test;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public String getComment() {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      return comment;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public void setComment(String comment) {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      this.comment = comment;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">}</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>3. "TestPersonDomain" - A second Entity that is referenced by "TestDomain"</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 8pt; font-family: courier new,courier;">package foo.domain;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">import javax.persistence.Column;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">import javax.persistence.Entity;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">import javax.persistence.GeneratedValue;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">import javax.persistence.GenerationType;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">import javax.persistence.Id;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">import javax.persistence.JoinColumn;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">import javax.persistence.ManyToOne;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">import javax.persistence.Table;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 8pt; font-family: courier new,courier;">@Entity</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">@Table(name="test_person")</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">public class TestPersonDomain {</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 8pt; font-family: courier new,courier;">   @Id</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   @GeneratedValue(strategy=GenerationType.IDENTITY)</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   @Column(name="id")</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   private Long id;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 8pt; font-family: courier new,courier;">   @ManyToOne(optional=false)</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   @JoinColumn(name="test_id", nullable=false)</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   private TestDomain test;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 8pt; font-family: courier new,courier;">   @Column(name="name", nullable=false)</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   private String name;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 8pt; font-family: courier new,courier;">   public Long getId() {</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">      return id;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   }</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   public void setId(Long id) {</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">      this.id = id;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   }</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   public TestDomain getTest() {</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">      return test;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   }</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   public void setTest(TestDomain test) {</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">      this.test = test;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   }</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   public String getName() {</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">      return name;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   }</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   public void setName(String name) {</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">      this.name = name;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   }</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">}</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>4. "TestBean" - Remote interface for EJB stateless session bean.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 8pt; font-family: courier new,courier;">package foo.bean;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">import javax.ejb.Remote;</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">import foo.domain.TestDomain;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-size: 8pt; font-family: courier new,courier;">@Remote</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">public interface TestBean {</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">   public TestDomain find(Long id);</span></p><p><span style="font-size: 8pt; font-family: courier new,courier;">}</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>5. "TestBeanImpl" - EJB stateless session bean implementation. This is where the PersistenceContext is used.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">package foo.bean.impl;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.ejb.Stateless;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.ejb.TransactionAttribute;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.ejb.TransactionAttributeType;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.EntityManager;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import javax.persistence.PersistenceContext;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import foo.bean.TestBean;</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">import foo.domain.TestDomain;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">@Stateless</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">@TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">public class TestBeanImpl implements TestBean {</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">   @PersistenceContext(unitName="bobo")</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   private EntityManager manager;</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;">   public TestDomain find(Long id) {</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">      return manager.find(TestDomain.class, id);</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">   }</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">}</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>6. persistence.xml</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: courier new,courier; font-size: 8pt;"><?xml version="1.0" encoding="UTF-8"?></span></p><p><span style="font-family: courier new,courier; font-size: 8pt;"><persistence</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">    xmlns="<a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence" target="_blank">http://java.sun.com/xml/ns/persistence</a>"</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">    xmlns:xsi="<a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema-instance" target="_blank">http://www.w3.org/2001/XMLSchema-instance</a>"</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">    xsi:schemaLocation="<a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence" target="_blank">http://java.sun.com/xml/ns/persistence</a> <a class="jive-link-external-small" href="http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" target="_blank">http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd</a>"</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">    version="2.0"></span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">    <persistence-unit name="bobo"></span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">        <jta-data-source>java:jboss/datasources/testDS</jta-data-source></span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">        <properties></span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" /></span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">            <property name="show_sql" value="false" /></span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">            <property name="format_sql" value="true" /></span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">            <property name="use_sql_comments" value="false" /></span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">        </properties></span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">    </persistence-unit></span></p><p><span style="font-family: courier new,courier; font-size: 8pt;"></persistence></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>7. portion of standalone.xml</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><table><tbody><tr><td style=";"><br/></td><td style=";"><span style="font-size: 8pt;"><subsystem xmlns="urn:jboss:domain:datasources:1.0"></span></td></tr><tr><td style=";"><br/></td><td style=";"><datasources></td></tr><tr><td style=";"><br/></td><td style=";"><datasource jndi-name="java:jboss/datasources/testDS" pool-name="testDS" enabled="true" jta="true" use-java-context="true" use-ccm="true"></td></tr><tr><td style=";"><br/></td><td style=";"><connection-url></td></tr><tr><td style=";"><br/></td><td style=";">jdbc:mysql://localhost:3306/bobo</td></tr><tr><td style=";"><br/></td><td style=";"></connection-url></td></tr><tr><td style=";"><br/></td><td style=";"><driver></td></tr><tr><td style=";"><br/></td><td style=";">mysql-connector-java-5.1.7-bin.jar</td></tr><tr><td style=";"><br/></td><td style=";"></driver></td></tr><tr><td style=";"><br/></td><td style=";"><pool></td></tr><tr><td style=";"><br/></td><td style=";"><min-pool-size></td></tr><tr><td style=";"><br/></td><td style=";">1</td></tr><tr><td style=";"><br/></td><td style=";"></min-pool-size></td></tr><tr><td style=";"><br/></td><td style=";"><max-pool-size></td></tr><tr><td style=";"><br/></td><td style=";">5</td></tr><tr><td style=";"><br/></td><td style=";"></max-pool-size></td></tr><tr><td style=";"><br/></td><td style=";"><prefill></td></tr><tr><td style=";"><br/></td><td style=";">true</td></tr><tr><td style=";"><br/></td><td style=";"></prefill></td></tr><tr><td style=";"><br/></td><td style=";"><use-strict-min></td></tr><tr><td style=";"><br/></td><td style=";">false</td></tr><tr><td style=";"><br/></td><td style=";"></use-strict-min></td></tr><tr><td style=";"><br/></td><td style=";"><flush-strategy></td></tr><tr><td style=";"><br/></td><td style=";">FailingConnectionOnly</td></tr><tr><td style=";"><br/></td><td style=";"></flush-strategy></td></tr><tr><td style=";"><br/></td><td style=";"></pool></td></tr><tr><td style=";"><br/></td><td style=";"><security></td></tr><tr><td style=";"><br/></td><td style=";"><user-name></td></tr><tr><td style=";"><br/></td><td style=";">bobo_trx</td></tr><tr><td style=";"><br/></td><td style=";"></user-name></td></tr><tr><td style=";"><br/></td><td style=";"><password></td></tr><tr><td style=";"><br/></td><td style=";">Query123</td></tr><tr><td style=";"><br/></td><td style=";"></password></td></tr><tr><td style=";"><br/></td><td style=";"></security></td></tr><tr><td style=";"><br/></td><td style=";"></datasource></td></tr><tr><td style=";"><br/></td><td style=";"><drivers></td></tr><tr><td style=";"><br/></td><td style=";"><driver name="h2" module="com.h2database.h2"></td></tr><tr><td style=";"><br/></td><td style=";"><xa-datasource-class></td></tr><tr><td style=";"><br/></td><td style=";">org.h2.jdbcx.JdbcDataSource</td></tr><tr><td style=";"><br/></td><td style=";"></xa-datasource-class></td></tr><tr><td style=";"><br/></td><td style=";"></driver></td></tr><tr><td style=";"><br/></td><td style=";"></drivers></td></tr><tr><td style=";"><br/></td><td style=";"></datasources></td></tr><tr><td style=";"><br/></td><td style=";"></subsystem></td></tr></tbody></table><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>8. Packaged into a JAR:</p><p><span style="font-family: courier new,courier; font-size: 8pt;">foo\bean\TestBean.class</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">foo\bean\impl\TestBeanImpl.class</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">foo\domain\TestCommentDomain.class</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">foo\domain\TestDomain.class</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">foo\domain\TestPersonDomain.class</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">META-INF\MANIFEST.MF</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">META-INF\persistence.xml</span></p><p><span style="font-family: courier new,courier; font-size: 8pt;">log4j.properties</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>9. A portion of the stack trace:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>11:53:52,662 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-8) MSC00001: Failed to start service jboss.persistenceunit."test.jar#bobo": org.jboss.msc.service.StartException in service jboss.persistenceunit."test.jar#bobo": Failed to start service</p><p>    at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1786)</p><p>    at org.jboss.msc.service.ServiceControllerImpl$ClearTCCLTask.run(ServiceControllerImpl.java:2291)</p><p>    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_14]</p><p>    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_14]</p><p>    at java.lang.Thread.run(Thread.java:619) [:1.6.0_14]</p><p>Caused by: javax.persistence.PersistenceException: [PersistenceUnit: bobo] Unable to build EntityManagerFactory</p><p>    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:903)</p><p>    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:879)</p><p>    at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:73)</p><p>    at org.jboss.as.jpa.service.PersistenceUnitService.createContainerEntityManagerFactory(PersistenceUnitService.java:170)</p><p>    at org.jboss.as.jpa.service.PersistenceUnitService.start(PersistenceUnitService.java:80)</p><p>    at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1765)</p><p>    ... 4 more</p><p>Caused by: <span style="color: #800000;">org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags</span></p><p>    at org.hibernate.loader.BasicLoader.postInstantiate(BasicLoader.java:92)</p><p>    at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:118)</p><p>    at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:70)</p><p>    at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:53)</p><p>    at org.hibernate.loader.entity.BatchingEntityLoader.createBatchingEntityLoader(BatchingEntityLoader.java:131)</p><p>    at org.hibernate.persister.entity.AbstractEntityPersister.createEntityLoader(AbstractEntityPersister.java:1976)</p><p>    at org.hibernate.persister.entity.AbstractEntityPersister.createEntityLoader(AbstractEntityPersister.java:1999)</p><p>    at org.hibernate.persister.entity.AbstractEntityPersister.createLoaders(AbstractEntityPersister.java:3248)</p><p>    at org.hibernate.persister.entity.AbstractEntityPersister.postInstantiate(AbstractEntityPersister.java:3234)</p><p>    at org.hibernate.persister.entity.SingleTableEntityPersister.postInstantiate(SingleTableEntityPersister.java:770)</p><p>    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:419)</p><p>    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1720)</p><p>    at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:77)</p><p>    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:894)</p><p>    ... 9 more</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>11:53:52,912 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-3) Stopped deployment test.jar in 6ms</p><p>11:53:52,912 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-3) Starting deployment of "test.jar"</p><p>11:53:52,912 INFO  [org.jboss.as.server.controller] (DeploymentScanner-threads - 1) Replacement of deployment "test.jar" by deployment "test.jar" was rolled back with failure message {"Failed services" => {"jboss.persistenceunit.\"test.jar#bobo\"" => "org.jboss.msc.service.StartException in service jboss.persistenceunit.\"test.jar#bobo\": Failed to start service"},"Services with missing/unavailable dependencies" => ["jboss.deployment.unit.\"test.jar\".jndiDependencyService missing [ jboss.naming.context.java.comp.test.test.TestBeanImpl.\"env/foo.bean.impl.TestBeanImpl/manager\" ]","jboss.deployment.unit.\"test.jar\".component.TestBeanImpl.START missing [ jboss.naming.context.java.comp.test.test.TestBeanImpl.\"env/foo.bean.impl.TestBeanImpl/manager\" ]"]}</p><p>11:53:52,912 INFO  [org.jboss.jpa] (MSC service thread 1-3) read persistence.xml for bobo</p><p>11:53:52,928 INFO  [org.jboss.as.ejb3.deployment.processors.EjbJndiBindingsDeploymentUnitProcessor] (MSC service thread 1-7) JNDI bindings for session bean named TestBeanImpl in deployment unit deployment "test.jar" are as follows:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    java:global/test/TestBeanImpl!foo.bean.TestBean</p><p>    java:app/test/TestBeanImpl!foo.bean.TestBean</p><p>    java:module/TestBeanImpl!foo.bean.TestBean</p><p>    java:global/test/TestBeanImpl</p><p>    java:app/test/TestBeanImpl</p><p>    java:module/TestBeanImpl</p></div>
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