我最近从使用 JSF2 切换到使用 CDI/weld。我有 2 个渴望的 @ManagedBeans(eager=true),其中一个有一个使用数据库查询 (JPA 2) 填充的列表。它工作得很好。
我切换到 CDI 并使用此处描述的技术重构了这些 bean http://ovaraksin.blogspot.com/2013/02/eager-cdi-beans.html。它适用于在 @PostConstruct init() 期间手动填充列表的 bean,但挂在填充列表的 bean 上,因为它正在注入使用数据库查询的服务。
它把东西挂得太厉害了,我不得不杀死服务器!
为什么会这样,除了让那个豆子不急切之外,还有其他方法吗?如果必须的话,我可以让豆子“不急”。我只是想知道我误解了什么。
这是挂着的豆子,它是后端
OsList.java:
import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.inject.Named;
import org.jboss.logging.Logger;
@Eager
@ApplicationScoped
@Named
public class OsList {
Logger log = Logger.getLogger(OsList.class);
private List<String> osList = new ArrayList<String>();
@Inject
OsListService osService;
public OsList() {}
@PostConstruct
public void init(){
log.info("Creating the one and only OsList bean");
osList = osService.fetchOs();
}
public List<String> getOsList() {
return osList;
}
public void setOsList(List<String> osList) {
this.osList = osList;
}
OsListService.java:
import java.util.ArrayList;
import java.util.List;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import org.jboss.logging.Logger;
import dne.nmst.dac.model.Devices;
import dne.nmst.dac.model.Devices_;
@Stateless
public class OsListService {
Logger log = Logger.getLogger(OsListService.class);
@PersistenceContext
EntityManager em;
public List<String> fetchOs() {
log.info("Do we ever get here?");
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<String> cq = cb.createQuery(String.class);
Root<Devices> d = cq.from(Devices.class);
cq.select(d.get(Devices_.os));
cq.distinct(true);
cq.orderBy(cb.asc(d.get(Devices_.os)));
TypedQuery<String> q = em.createQuery(cq);
List<String> iosList = new ArrayList<String>();
iosList.add("");
for (String s : q.getResultList()) {
iosList.add(s);
}
return iosList;
}
日志文件
11:14:43,569 INFO [org.jboss.as.server.deployment.scanner] (DeploymentScanner-threads - 1) JBAS015003: Found ond-cdi.war in deployment directory. To trigger deployment create a file called ond-cdi.war.dodeploy
11:14:43,590 INFO [org.jboss.as.server.deployment] (MSC service thread 1-8) JBAS015876: Starting deployment of "ond-cdi.war" (runtime-name: "ond-cdi.war")
11:14:45,330 INFO [org.jboss.as.jpa] (MSC service thread 1-5) JBAS011401: Read persistence.xml for ond
11:14:45,731 INFO [org.jboss.weld.deployer] (MSC service thread 1-7) JBAS016002: Processing weld deployment ond-cdi.war
11:14:45,781 INFO [org.jboss.as.ejb3.deployment.processors.EjbJndiBindingsDeploymentUnitProcessor] (MSC service thread 1-7) JNDI bindings for session bean named OsListService in deployment unit deployment "ond-cdi.war" are as follows:
java:global/ond-cdi/OsListService!gov.ssa.dne.nmst.service.OsListService
java:app/ond-cdi/OsListService!gov.ssa.dne.nmst.service.OsListService
java:module/OsListService!gov.ssa.dne.nmst.service.OsListService
java:global/ond-cdi/OsListService
java:app/ond-cdi/OsListService
java:module/OsListService
11:14:45,781 INFO [org.jboss.as.ejb3.deployment.processors.EjbJndiBindingsDeploymentUnitProcessor] (MSC service thread 1-7) JNDI bindings for session bean named DeviceService in deployment unit deployment "ond-cdi.war" are as follows:
java:global/ond-cdi/DeviceService!gov.ssa.dne.nmst.service.DeviceService
java:app/ond-cdi/DeviceService!gov.ssa.dne.nmst.service.DeviceService
java:module/DeviceService!gov.ssa.dne.nmst.service.DeviceService
java:global/ond-cdi/DeviceService
java:app/ond-cdi/DeviceService
java:module/DeviceService
11:14:46,071 INFO [org.jboss.weld.deployer] (MSC service thread 1-7) JBAS016005: Starting Services for CDI deployment: ond-cdi.war
11:14:46,121 INFO [org.jboss.weld.Version] (MSC service thread 1-7) WELD-000900 1.1.13 (redhat)
11:14:46,151 INFO [org.jboss.weld.deployer] (MSC service thread 1-5) JBAS016008: Starting weld service for deployment ond-cdi.war
11:14:46,151 INFO [org.jboss.as.jpa] (ServerService Thread Pool -- 48) JBAS011402: Starting Persistence Unit Service 'ond-cdi.war#ond'
11:14:46,281 INFO [org.hibernate.annotations.common.Version] (ServerService Thread Pool -- 48) HCANN000001: Hibernate Commons Annotations {4.0.1.Final-redhat-2}
11:14:46,281 INFO [org.hibernate.Version] (ServerService Thread Pool -- 48) HHH000412: Hibernate Core {4.2.0.Final-redhat-1}
11:14:46,281 INFO [org.hibernate.cfg.Environment] (ServerService Thread Pool -- 48) HHH000206: hibernate.properties not found
11:14:46,281 INFO [org.hibernate.cfg.Environment] (ServerService Thread Pool -- 48) HHH000021: Bytecode provider name : javassist
11:14:46,301 INFO [org.hibernate.ejb.Ejb3Configuration] (ServerService Thread Pool -- 48) HHH000204: Processing PersistenceUnitInfo [
name: ond
...]
11:14:46,621 INFO [org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator] (ServerService Thread Pool -- 48) HHH000130: Instantiating explicit connection provider: org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider
11:14:46,842 INFO [org.hibernate.dialect.Dialect] (ServerService Thread Pool -- 48) HHH000400: Using dialect: org.hibernate.dialect.MySQLInnoDBDialect
11:14:46,862 INFO [org.hibernate.engine.transaction.internal.TransactionFactoryInitiator] (ServerService Thread Pool -- 48) HHH000268: Transaction strategy: org.hibernate.engine.transaction.internal.jta.CMTTransactionFactory
11:14:46,862 INFO [org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory] (ServerService Thread Pool -- 48) HHH000397: Using ASTQueryTranslatorFactory
11:14:46,892 INFO [org.hibernate.validator.internal.util.Version] (ServerService Thread Pool -- 48) HV000001: Hibernate Validator 4.3.1.Final-redhat-1
11:14:47,592 INFO [org.jboss.solder.config.xml.bootstrap.XmlConfigExtension] (MSC service thread 1-6) Solder Config XML provider starting...
11:14:47,592 INFO [org.jboss.solder.config.xml.bootstrap.XmlConfigExtension] (MSC service thread 1-6) Loading XmlDocumentProvider: org.jboss.solder.config.xml.bootstrap.ResourceLoaderXmlDocumentProvider
11:14:47,602 INFO [org.jboss.solder.config.xml.bootstrap.XmlConfigExtension] (MSC service thread 1-6) Reading XML file: vfs:/D:/work/software/jboss-eap-6.1/standalone/deployments/ond-cdi.war/WEB-INF/beans.xml
11:14:47,612 INFO [org.jboss.solder.Version] (MSC service thread 1-6) Solder 3.1.1.Final (build id: 3.1.1.Final)
11:14:48,422 INFO [gov.ssa.dne.nmst.util.OsList] (MSC service thread 1-6) Creating the one and only OsList bean