我开始接触Seam 3和Weld。现在我正在努力坚持 - 实体管理器没有被注入。
拳头，我从头开始设置了一个maven项目（未生成）。该项目有两个子模块：
所以在Web模块中，我在src/main/resources/META-INF中有我的persistence.xml：
<?xml version="1.0" encoding="UTF-8"?>
<!-- Persistence deployment descriptor for dev profile -->
<persistence xmlns="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 http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="allternative" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:jboss/datasources/allternativeDS</jta-data-source>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
<property name="hibernate.hbm2ddl.auto" value="update" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.format_sql" value="true" />
<property name="hibernate.transaction.manager_lookup_class"
value="org.hibernate.transaction.JBossTransactionManagerLookup" />
<property name="hibernate.connection.autocommit" value="true" />
</properties>
</persistence-unit>
</persistence>
然后我有了ApplicationInitializer类：
@Named
@ApplicationScoped
public class ApplicationInitializer {
@Produces
@PersistenceContext(unitName="allternative")
@Dependent
EntityManager entityManager;
@Produces
@PersistenceUnit(unitName="allternative")
@Dependent
EntityManagerFactory entityManagerFactory;
}
类CurrentUser：
@Named("currentUser")
@SessionScoped
public class CurrentUser implements Serializable {
private boolean isLogin = false;
@Inject
private EntityManager entityManager;
@Inject
private Logger log;
private User user;
public CurrentUser() {
this.user = null;
}
public User getUser() {
log.info("getting user");
if(this.user == null) {
log.info("user is null, getting default from db");
this.user = entityManager.find(User.class, "thobens"); // <- strange exception here
// log.info("took user "+user.getUsername());
}
return user;
}
public void setUser(User user) {
this.user = user;
}
}
当我调用＃{currentUser.user}时，我得到以下奇怪的异常：
16:57:04,768 SEVERE [javax.enterprise.resource.webcontainer.jsf.application] (http--127.0.0.1-8080-1) Error Rendering View[/index.xhtml]: javax.el.ELException: /index.xhtml: java.lang.RuntimeException: Can't find a deployment unit named allternative at deployment "web.war"
at com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:88) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at com.sun.faces.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:82) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at com.sun.faces.facelets.compiler.UILeaf.encodeAll(UILeaf.java:183) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at org.richfaces.renderkit.RendererBase.renderChildren(RendererBase.java:278) [richfaces-components-ui-4.0.0.Final.jar:]
at org.richfaces.renderkit.html.PanelRenderer.encodeEnd(PanelRenderer.java:181) [richfaces-components-ui-4.0.0.Final.jar:]
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1763) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1759) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:401) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at com.ocpsoft.pretty.faces.application.PrettyViewHandler.renderView(PrettyViewHandler.java:163) [prettyfaces-jsf2-3.3.0.jar:]
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:288) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594) [jboss-jsf-api_2.1_spec-2.0.0.Beta1.jar:2.0.0.Beta1]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:67) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at com.ocpsoft.pretty.PrettyFilter.doFilter(PrettyFilter.java:118) [prettyfaces-jsf2-3.3.0.jar:]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.jboss.solder.servlet.exception.CatchExceptionFilter.doFilter(CatchExceptionFilter.java:65) [solder-impl-3.1.0.Beta3.jar:]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.jboss.solder.servlet.event.ServletEventBridgeFilter.doFilter(ServletEventBridgeFilter.java:72) [solder-impl-3.1.0.Beta3.jar:]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:139) [jboss-as-web-7.0.2.Final.jar:7.0.2.Final]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:388) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.jboss.as.web.NamingValve.invoke(NamingValve.java:57) [jboss-as-web-7.0.2.Final.jar:7.0.2.Final]
at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:49) [jboss-as-jpa-7.0.2.Final.jar:7.0.2.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:154) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:667) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:952) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at java.lang.Thread.run(Thread.java:619) [:1.6.0_20]
Caused by: java.lang.RuntimeException: Can't find a deployment unit named allternative at deployment "web.war"
at org.jboss.as.weld.services.bootstrap.WeldJpaInjectionServices.getScopedPUName(WeldJpaInjectionServices.java:94) [jboss-as-weld-7.0.2.Final.jar:7.0.2.Final]
at org.jboss.as.weld.services.bootstrap.WeldJpaInjectionServices.resolvePersistenceContext(WeldJpaInjectionServices.java:59) [jboss-as-weld-7.0.2.Final.jar:7.0.2.Final]
at org.jboss.weld.util.Beans.injectEEFields(Beans.java:784) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.ManagedBean$ManagedBeanInjectionTarget$1$1.proceed(ManagedBean.java:181) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.injection.InjectionContextImpl.run(InjectionContextImpl.java:54) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.ManagedBean$ManagedBeanInjectionTarget$1.work(ManagedBean.java:176) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.ManagedBean$FixInjectionPoint.run(ManagedBean.java:142) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.ManagedBean$ManagedBeanInjectionTarget.inject(ManagedBean.java:170) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.ManagedBean.create(ManagedBean.java:339) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.context.AbstractContext.get(AbstractContext.java:122) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.manager.BeanManagerImpl.getReference(BeanManagerImpl.java:693) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.AbstractReceiverBean.getReceiver(AbstractReceiverBean.java:84) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.ProducerField$1.produce(ProducerField.java:134) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.AbstractProducerBean.create(AbstractProducerBean.java:361) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.builtin.ee.EEResourceProducerField.createUnderlying(EEResourceProducerField.java:170) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.builtin.ee.EEResourceProducerField.access$000(EEResourceProducerField.java:54) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.builtin.ee.EEResourceProducerField$EEResourceCallable.call(EEResourceProducerField.java:80) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.builtin.CallableMethodHandler.invoke(CallableMethodHandler.java:50) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.proxy.EnterpriseTargetBeanInstance.invoke(EnterpriseTargetBeanInstance.java:62) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:125) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at org.jboss.weldx.persistence.EntityManager$-1772293428$Proxy$_$$_Weld$Proxy$.find(EntityManager$-1772293428$Proxy$_$$_Weld$Proxy$.java) [weld-core-1.1.2.Final.jar:]
at com.allternative.web.security.CurrentUser.getUser(CurrentUser.java:42) [classes:]
at com.allternative.web.security.CurrentUser$Proxy$_$$_WeldClientProxy.getUser(CurrentUser$Proxy$_$$_WeldClientProxy.java) [classes:]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_20]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [:1.6.0_20]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_20]
at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_20]
at javax.el.BeanELResolver.getValue(BeanELResolver.java:302) [jboss-el-api_2.2_spec-1.0.0.Final.jar:1.0.0.Final]
at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at org.apache.el.parser.AstValue.getValue(AstValue.java:134) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:187) [jbossweb-7.0.1.Final.jar:7.0.2.Final]
at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:55) [weld-core-1.1.2.Final.jar:2011-07-26 15:02]
at com.sun.faces.facelets.el.ELText$ELTextVariable.writeText(ELText.java:224) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at com.sun.faces.facelets.el.ELText$ELTextComposite.writeText(ELText.java:148) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
at com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:85) [jsf-impl-2.1.3-b02-jbossorg-2.jar:2.1.3-SNAPSHOT]
... 46 more
只要我触摸entityManager，就会发生这种情况。当我使用@PersistenceContext而不是@Inject对其进行注释时，会在部署时发生此错误。
我想这与persistence.xml没有进行处理有关，因为
a）当我致电Persistence.createEntityManagerFactory("allternative").createEntityManager()时，我收到错误消息，说没有这样的持久性单元。
b）我将hibernate.hbm2ddl.auto设置为“更新”（并尝试使用“创建”），但我没有得到任何反馈，表明我的实体是在数据库中创建的（并且正在运行show tables;在mysql上也会产生一个空集）。如果创建了持久性单元，我也没有得到提示。 DataSource可用（并由JBoss部署）并创建数据库。
我的beans.xml是src/main/webapp/WEB-INF/的locatex（仅限于网络模块）：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:t="urn:java:org.jboss.seam.persistence.transaction"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/beans_1_0.xsd">
<interceptors>
<class>org.jboss.seam.faces.context.conversation.ConversationBoundaryInterceptor</class>
<class>org.jboss.seam.transaction.TransactionInterceptor</class>
</interceptors>
</beans>
目前我有一个实体（在模型模块中）：
@Entity
@Table(name="user")
public class User {
@Id
@Length(min=6, max=32)
private String username;
@NotNull
private String firstname;
@NotNull
private String lastname;
@NotNull
@Length(min=6, max=64)
private String password;
public String getUsername() {
return username;
}
public void setUsername(String user) {
this.username = user;
}
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public int hashCode() {
return this.username.hashCode();
}
@Override
public boolean equals(Object other) {
if(other == null) {
return false;
}
if(!(other instanceof User)) {
return false;
}
User otherUser = (User)other;
String user = otherUser.getUsername();
if(user == null || this.username == null) {
return false;
}
return this.username.equals(user);
}
@Override
public String toString() {
return this.username;
}
}
我真的不明白为什么这不起作用。有人可以帮帮我吗？
提前致谢，
安德烈亚斯
答案 0 :(得分：1)
据我所知， ejb 模块中必须存在persistence.xml（模型的包装类型为ejb， ？）。在此目录src/main/resources/META-INF中，我还有一个空的beans.xml。
我不确定你的@ApplicationScoped ApplicationInitializer。我认为你正在使用这个类来获得注射@EntityManager，但我不知道这是否是推荐的方式（我希望这个答案是）。您可以在 ejb 模块中尝试以下操作，而不是使用类ApplicationInitializer：创建一个类MyRepository以区分多个持久性单元和一个类MyRepositoryProducer @Produce EntityManager：
@Qualifier
@Target({ ElementType.TYPE, ElementType.METHOD,
ElementType.PARAMETER, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface MyRepository {}
和
public class MyRepositoryProducer
{
@SuppressWarnings("unused")
@Produces
@MyRepository
@PersistenceContext
private EntityManager em;
}
然后你可以在你的EntityManager - Bean中注入你的CurrentUser
@Inject @MyRepository private EntityManager em;
答案 1 :(得分：1)