Ich habe eine einfache Implementierung von JPA 2.0 Anmerkungen, die nicht funktioniert. Dies läuft in Karaf 4.0.5 als Server. Im Folgenden sind die relevanten Auszüge aus persistence.xml, blueprint.xml und der Klasse aufgeführt. Die Ausnahme ist unten aufgeführt. Das Problem ist, dass EntityManager em
immer Null ist. Ich habe erwartet, dass dies durch einen Blueprint injiziert wird.jpa 2.0 injiziert nicht EntityManager
Kann jemand darauf hinweisen, wo ich falsch gelaufen bin?
Klasse
import javax.persistence.PersistenceContext;
import javax.transaction.Transactional;
@Transactional
public class LookupMfgService implements ILookupMfgService {
private static Logger logger = LoggerFactory.getLogger(LookupMfgService.class);
@PersistenceContext(unitName = "pu_motordb3")
private EntityManager em;
@Override
public List<String> getPreferredMfgNames() throws BusinessException {
List<String> list = new ArrayList<>();
try {
// em is null here so NPE thrown
TypedQuery<String> q = em.createNamedQuery("listMfgPreferredNames", String.class);
list = q.getResultList();
} catch (Throwable t) {
logger.error("Error selecting list of manufacturers", t);
throw JpaExceptionFactory.createGeneralError(t, this.getClass().getName());
}
return list;
}
public void setEm(EntityManager entityManager) {
logger.debug(this.getClass().getName() + ".setEntityManager()");
logger.debug("setEntityManager called with " + (entityManager == null ? "null" : entityManager.toString()));
this.em = entityManager;
}
}
DataSource.xml
<blueprint default-activation="eager"
xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0"
xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0 http://www.osgi.org/xmlns/blueprint/v1.0.0
http://www.w3.org/2001/XMLSchema-instance http://www.w3.org/2001/XMLSchema-instance
http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0 http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0 ">
<bean id="dataSource" class="org.postgresql.ds.PGPoolingDataSource" destroy-method="close">
<property name="serverName" value="XXX"/>
<property name="user" value="XXX"/>
<property name="password" value="XXX"/>
<property name="dataSourceName" value="pgConnectionPool"/>
<property name="initialConnections" value="5"/>
<property name="maxConnections" value="50" />
</bean>
<service interface="javax.sql.DataSource" ref="dataSource">
<service-properties>
<entry key="osgi.jndi.service.name" value="MotorDB"/>
</service-properties>
</service>
</blueprint>
Blueprint.xml
<blueprint default-activation="eager"
xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:ext="http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0"
xmlns:tx="http://aries.apache.org/xmlns/transactions/v2.0.0" xmlns:jpa="http://aries.apache.org/xmlns/jpa/v2.0.0"
xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0"
xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0 https://osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd
http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0 http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0
http://aries.apache.org/xmlns/transactions/v2.0.0 http://aries.apache.org/xmlns/transactions/v2.0.0
http://aries.apache.org/xmlns/jpa/v2.0.0 http://aries.apache.org/xmlns/jpa/v2.0.0
http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0 http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0">
<jpa:enable />
<tx:enable />
<service id="mfgLookupService" ref="mfgLookupEntityImpl" interface="ILookupMfgService"/>
</blueprint>
persistence.xml
<?xml version="1.0" encoding="UTF-8" ?>
<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="pu_motordb3" transaction-type="JTA">
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
<jta-data-source>osgi:service/javax.sql.DataSource/(osgi.jndi.service.name=MotorDB)</jta-data-source>
Classes listed here
</persistence-unit>
</persistence>
Karaf log
2016-09-01 09:45:48,689 | INFO | PersistenceBundleTracker | 90 - org.apache.aries.jpa.container - 2.3.0 | Found persistence unit reference3 in bundle entity with provider org.apache.openjpa.persistence.PersistenceProviderImpl.
2016-09-01 09:45:48,695 | INFO | PersistenceBundleTracker | 90 - org.apache.aries.jpa.container - 2.3.0 | Found persistence unit pu_motordb3 in bundle entity with provider org.apache.openjpa.persistence.PersistenceProviderImpl.
2016-09-01 09:45:48,695 | INFO | PersistenceBundleTracker | 90 - org.apache.aries.jpa.container - 2.3.0 | Persistence units added for bundle com.easa.server.entity event 128
Exception
2016-08-31 18:42:49,286 | ERROR | nelWorkerThread0 | LookupMfgService | Error selecting list of manufacturers
java.lang.NullPointerException
at LookupMfgService.getPreferredMfgNames(LookupMfgService.java:93)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[:1.8.0_91]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[:1.8.0_91]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.8.0_91]
at java.lang.reflect.Method.invoke(Method.java:498)[:1.8.0_91]
at ch.ethz.iks.r_osgi.impl.ChannelEndpointImpl.handleMessage(ChannelEndpointImpl.java:1265)[69:ch.ethz.iks.r_osgi.remote:1.0.8.RC1_v20160823-2221]
at ch.ethz.iks.r_osgi.impl.ChannelEndpointImpl$2.run(ChannelEndpointImpl.java:315)[69:ch.ethz.iks.r_osgi.remote:1.0.8.RC1_v20160823-2221]
at ch.ethz.iks.r_osgi.impl.ChannelEndpointImpl$1.run(ChannelEndpointImpl.java:280)[69:ch.ethz.iks.r_osgi.remote:1.0.8.RC1_v20160823-2221]
Oliver behoben ... Vielen Dank für Ihre Bewertung und Kommentare! Ich habe eine separate blueprint.xml, die die Datenquelle und JNDI-Referenz erstellt. Ich habe es oben eingefügt. Ich habe den Provider hinzugefügt und den Setter geändert/hinzugefügt. Erhalten Sie immer noch einen Nullzeiger, wenn Sie versuchen, den EntityManager zu referenzieren. Die Anmerkung sollte die Injektion behandeln, anstatt sie direkt in die Datei blueprint.xml hinzuzufügen –