Karaf 4.0.0 M2、Hibernate 4.3.6 和 org.hibernate.PropertyAccessException
Karaf 4.0.0 M2, Hibernate 4.3.6, and org.hibernate.PropertyAccessException
我正在关注 Christian Schneider 在以下 url 上的 Karaf/Database 教程：
http://www.liquid-reality.de/display/liquid/2012/01/13/Apache+Karaf+Tutorial+Part+6+-+Database+Access
我对本教程的更改是使用 MySql 和 Hibernate，而不是 H2 和 OpenJpa。话虽如此，我加载了我的自定义包，但 Hibernate 无法使用反射来访问我的实体 class 中的属性。我得到的堆栈跟踪如下。
我的一些具体问题是：
- 我是否需要 hibernate.properties 文件，因为 persistence.xml 文件引用数据源并允许设置休眠属性
- 我的 pom.xml 文件中是否需要额外的依赖项
- 是否有其他一些与 pom.xml 或 hibernate.properties 无关的原因导致了下面显示的异常？
提前感谢您提出任何建议。
兰迪
2015-06-05 16:40:04,088 | ERROR | nsole user karaf | ShellUtil | 41 - org.apache.karaf.shell.core - 4.0.0.M2 | Exception caught while executing command
java.lang.reflect.UndeclaredThrowableException
at com.sun.proxy.$Proxy72.persist(Unknown Source)[146:org.apache.aries.jpa.container.context:1.0.4]
at net.lr.tutorial.karaf.db.examplejpa.impl.PersonServiceImpl.add(PersonServiceImpl.java:23)[167:leonard-orm-native:1.0.0]
at Proxyead5dc4a_ed6c_46e9_8aad_e93af2278046.add(Unknown Source)[:]
at net.lr.tutorial.karaf.db.examplejpa.command.AddPersonCommand.execute(AddPersonCommand.java:42)[167:leonard-orm-native:1.0.0]
at org.apache.karaf.shell.commands.basic.AbstractCommand.execute(AbstractCommand.java:34)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.karaf.shell.compat.CommandTracker.execute(CommandTracker.java:109)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:67)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:87)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:480)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:406)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:182)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:119)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:94)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.karaf.shell.impl.console.ConsoleSessionImpl.run(ConsoleSessionImpl.java:267)[41:org.apache.karaf.shell.core:4.0.0.M2]
at java.lang.Thread.run(Thread.java:745)[:1.7.0_60-ea]
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[:1.7.0_60-ea]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)[:1.7.0_60-ea]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.7.0_60-ea]
at java.lang.reflect.Method.invoke(Method.java:606)[:1.7.0_60-ea]
at org.apache.aries.jpa.container.context.transaction.impl.JTAEntityManagerHandler.invoke(JTAEntityManagerHandler.java:185)[146:org.apache.aries.jpa.container.context:1.0.4]
... 16 more
Caused by: java.lang.reflect.UndeclaredThrowableException
at com.sun.proxy.$Proxy76.persist(Unknown Source)
... 21 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[:1.7.0_60-ea]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)[:1.7.0_60-ea]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.7.0_60-ea]
at java.lang.reflect.Method.invoke(Method.java:606)[:1.7.0_60-ea]
at org.apache.aries.jpa.container.impl.EntityManagerProxyFactory$EMHandler.invoke(EntityManagerProxyFactory.java:31)
... 22 more
Caused by: javax.persistence.PersistenceException: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of net.lr.tutorial.karaf.db.examplejpa.Person.name
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1763)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1677)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1683)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1187)
... 27 more
Caused by: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of net.lr.tutorial.karaf.db.examplejpa.Person.name
at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:60)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:346)
at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4746)
at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:4465)
at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:243)
at org.hibernate.event.internal.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:511)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:116)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:75)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:784)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:789)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1181)
... 27 more
Caused by: java.lang.IllegalArgumentException: Can not set java.lang.String field net.lr.tutorial.karaf.db.examplejpa.Person.name to net.lr.tutorial.karaf.db.examplejpa.Person
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:164)[:1.7.0_60-ea]
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:168)[:1.7.0_60-ea]
at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:55)[:1.7.0_60-ea]
at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36)[:1.7.0_60-ea]
at java.lang.reflect.Field.get(Field.java:379)[:1.7.0_60-ea]
at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:57)
... 38 more
blueprint.xml
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/xmlns/jpa/v1.0.0 http://aries.apache.org/xmlns/jpa/v1.0.0
http://aries.apache.org/xmlns/transactions/v1.0.0 http://aries.apache.org/xmlns/transactions/v1.0.0 ">
<bean id="personService" class="net.lr.tutorial.karaf.db.examplejpa.impl.PersonServiceImpl">
<jpa:context unitname="Leonard" property="entityManager" />
<tx:transaction method="*" value="Required" />
</bean>
<service ref="personService" interface="net.lr.tutorial.karaf.db.examplejpa.PersonService" />
<command-bundle xmlns="http://karaf.apache.org/xmlns/shell/v1.0.0">
<command name="person/add">
<action class="net.lr.tutorial.karaf.db.examplejpa.command.AddPersonCommand">
<property name="personService" ref="personService" />
</action>
</command>
<command name="person/list">
<action class="net.lr.tutorial.karaf.db.examplejpa.command.ListPersonsCommand">
<property name="personService" ref="personService" />
</action>
</command>
<command name="person/deleteAll">
<action class="net.lr.tutorial.karaf.db.examplejpa.command.DeleteAllPersonsCommand">
<property name="personService" ref="personService" />
</action>
</command>
</command-bundle>
persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="Leonard" transaction-type="JTA">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<jta-data-source>osgi:service/Leonard</jta-data-source>
<class>net.lr.tutorial.karaf.db.examplejpa.Person</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
</properties>
</persistence-unit>
</persistence>
Person.java
package net.lr.tutorial.karaf.db.examplejpa;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "Person")
public class Person
{
private String name;
private String twitterName;
public Person()
{
}
public Person(String name, String twitterName)
{
super();
this.name = name;
this.twitterName = twitterName;
}
@Id
@Column(name = "name", unique = true)
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
@Column(name = "twitterName")
public String getTwitterName()
{
return twitterName;
}
public void setTwitterName(String twitterName)
{
this.twitterName = twitterName;
}
}
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>info.leonard.orm</groupId>
<artifactId>leonard-orm-native</artifactId>
<version>1.0.0</version>
<packaging>bundle</packaging>
<properties>
<log4j-version>1.2.16</log4j-version>
<slf4j-version>1.6.1</slf4j-version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.karaf.shell</groupId>
<artifactId>org.apache.karaf.shell.console</artifactId>
<version>4.0.0.M2</version>
</dependency>
<dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.core</artifactId>
<version>4.3.1</version>
</dependency>
<dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.enterprise</artifactId>
<version>4.2.0</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j-version}</version>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.3.6.Final</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-osgi</artifactId>
<version>4.3.6.Final</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.3.6.Final</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate.common</groupId>
<artifactId>hibernate-commons-annotations</artifactId>
<version>4.0.4.Final</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.35</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j-version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j-version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<version>2.5.3</version>
<extensions>true</extensions>
<configuration>
<instructions>
<Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
<Meta-Persistence>META-INF/persistence.xml</Meta-Persistence>
<Import-Package>
org.apache.felix.service.command;version="[0.6,1)",
org.apache.felix.gogo.commands;version="[0.6,1)",
org.apache.karaf.shell.console;version="[2.2,4)",
*,
org.hibernate.jpa,
org.hibernate.proxy,
javassist.util.proxy
</Import-Package>
</instructions>
</configuration>
</plugin>
</plugins>
</build>
</project>
PersonServiceImpl.java
package net.lr.tutorial.karaf.db.examplejpa.impl;
import java.util.List;
import javax.persistence.EntityManager;
import net.lr.tutorial.karaf.db.examplejpa.Person;
import net.lr.tutorial.karaf.db.examplejpa.PersonService;
public class PersonServiceImpl implements PersonService
{
private EntityManager em;
public void setEntityManager(EntityManager em)
{
this.em = em;
}
public void add(Person person)
{
em.persist(person);
em.flush();
}
public void deleteAll()
{
em.createQuery("delete from Person").executeUpdate();
em.flush();
}
public List<Person> getAll()
{
return em.createQuery("select p from Person p", Person.class).getResultList();
}
}
我重新启动了我的 karaf 实例，并查看了启动后的日志。以下项目引起了我的注意：
2015-06-06 04:17:02,988 | WARN | FelixStartLevel | aries | 144 - org.apache.aries.jpa.blueprint.aries - 1.0.4 | Managed persistence context support is no longer available for use with the Aries Blueprint container.
请注意，我的示例使用的是容器管理的 JPA。看起来很奇怪，这实际上不受支持，但会在周末尝试非托管 JPA 实现。
我已将原始 post 中列出的相同代码部署到 Apache Karaf 3.0.3 实例，代码运行良好。问题出在 Apache Karaf 4.0.0 M2，更具体地说是 Apache Aries v1.0.4。
如前所述 posted，Aries 1.0.4 在 Karaf 4.0.0 M2 中启动时生成以下警告
2015-06-06 04:17:02,988 | WARN | FelixStartLevel | aries | 144 - org.apache.aries.jpa.blueprint.aries - 1.0.4 | Managed persistence context support is no longer available for use with the Aries Blueprint container.
此警告表明 Aries 现在在 blueprint.xml 文件中声明工件时遇到问题。
Christian Schneider 写了一篇 post 说明 Aries 现在如何使用注解来声明上下文：
http://www.liquid-reality.de/display/liquid/New+design+for+aries+jpa
我还没有尝试过这些注释，但会留给其他人来确认 Aries 1.0.4（因此 Karaf 4.0.0）不再支持在 blueprint.xml 文件中声明上下文。
我正在关注 Christian Schneider 在以下 url 上的 Karaf/Database 教程： http://www.liquid-reality.de/display/liquid/2012/01/13/Apache+Karaf+Tutorial+Part+6+-+Database+Access
我对本教程的更改是使用 MySql 和 Hibernate，而不是 H2 和 OpenJpa。话虽如此，我加载了我的自定义包，但 Hibernate 无法使用反射来访问我的实体 class 中的属性。我得到的堆栈跟踪如下。
我的一些具体问题是：
- 我是否需要 hibernate.properties 文件，因为 persistence.xml 文件引用数据源并允许设置休眠属性
- 我的 pom.xml 文件中是否需要额外的依赖项
- 是否有其他一些与 pom.xml 或 hibernate.properties 无关的原因导致了下面显示的异常？
提前感谢您提出任何建议。 兰迪
2015-06-05 16:40:04,088 | ERROR | nsole user karaf | ShellUtil | 41 - org.apache.karaf.shell.core - 4.0.0.M2 | Exception caught while executing command
java.lang.reflect.UndeclaredThrowableException
at com.sun.proxy.$Proxy72.persist(Unknown Source)[146:org.apache.aries.jpa.container.context:1.0.4]
at net.lr.tutorial.karaf.db.examplejpa.impl.PersonServiceImpl.add(PersonServiceImpl.java:23)[167:leonard-orm-native:1.0.0]
at Proxyead5dc4a_ed6c_46e9_8aad_e93af2278046.add(Unknown Source)[:]
at net.lr.tutorial.karaf.db.examplejpa.command.AddPersonCommand.execute(AddPersonCommand.java:42)[167:leonard-orm-native:1.0.0]
at org.apache.karaf.shell.commands.basic.AbstractCommand.execute(AbstractCommand.java:34)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.karaf.shell.compat.CommandTracker.execute(CommandTracker.java:109)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:67)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:87)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:480)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:406)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:182)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:119)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:94)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.karaf.shell.impl.console.ConsoleSessionImpl.run(ConsoleSessionImpl.java:267)[41:org.apache.karaf.shell.core:4.0.0.M2]
at java.lang.Thread.run(Thread.java:745)[:1.7.0_60-ea]
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[:1.7.0_60-ea]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)[:1.7.0_60-ea]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.7.0_60-ea]
at java.lang.reflect.Method.invoke(Method.java:606)[:1.7.0_60-ea]
at org.apache.aries.jpa.container.context.transaction.impl.JTAEntityManagerHandler.invoke(JTAEntityManagerHandler.java:185)[146:org.apache.aries.jpa.container.context:1.0.4]
... 16 more
Caused by: java.lang.reflect.UndeclaredThrowableException
at com.sun.proxy.$Proxy76.persist(Unknown Source)
... 21 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[:1.7.0_60-ea]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)[:1.7.0_60-ea]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.7.0_60-ea]
at java.lang.reflect.Method.invoke(Method.java:606)[:1.7.0_60-ea]
at org.apache.aries.jpa.container.impl.EntityManagerProxyFactory$EMHandler.invoke(EntityManagerProxyFactory.java:31)
... 22 more
Caused by: javax.persistence.PersistenceException: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of net.lr.tutorial.karaf.db.examplejpa.Person.name
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1763)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1677)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1683)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1187)
... 27 more
Caused by: org.hibernate.PropertyAccessException: could not get a field value by reflection getter of net.lr.tutorial.karaf.db.examplejpa.Person.name
at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:60)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:346)
at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4746)
at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:4465)
at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:243)
at org.hibernate.event.internal.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:511)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:116)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:75)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:784)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:789)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1181)
... 27 more
Caused by: java.lang.IllegalArgumentException: Can not set java.lang.String field net.lr.tutorial.karaf.db.examplejpa.Person.name to net.lr.tutorial.karaf.db.examplejpa.Person
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:164)[:1.7.0_60-ea]
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:168)[:1.7.0_60-ea]
at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:55)[:1.7.0_60-ea]
at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36)[:1.7.0_60-ea]
at java.lang.reflect.Field.get(Field.java:379)[:1.7.0_60-ea]
at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:57)
... 38 more
blueprint.xml
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/xmlns/jpa/v1.0.0 http://aries.apache.org/xmlns/jpa/v1.0.0
http://aries.apache.org/xmlns/transactions/v1.0.0 http://aries.apache.org/xmlns/transactions/v1.0.0 ">
<bean id="personService" class="net.lr.tutorial.karaf.db.examplejpa.impl.PersonServiceImpl">
<jpa:context unitname="Leonard" property="entityManager" />
<tx:transaction method="*" value="Required" />
</bean>
<service ref="personService" interface="net.lr.tutorial.karaf.db.examplejpa.PersonService" />
<command-bundle xmlns="http://karaf.apache.org/xmlns/shell/v1.0.0">
<command name="person/add">
<action class="net.lr.tutorial.karaf.db.examplejpa.command.AddPersonCommand">
<property name="personService" ref="personService" />
</action>
</command>
<command name="person/list">
<action class="net.lr.tutorial.karaf.db.examplejpa.command.ListPersonsCommand">
<property name="personService" ref="personService" />
</action>
</command>
<command name="person/deleteAll">
<action class="net.lr.tutorial.karaf.db.examplejpa.command.DeleteAllPersonsCommand">
<property name="personService" ref="personService" />
</action>
</command>
</command-bundle>
persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="Leonard" transaction-type="JTA">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<jta-data-source>osgi:service/Leonard</jta-data-source>
<class>net.lr.tutorial.karaf.db.examplejpa.Person</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
</properties>
</persistence-unit>
</persistence>
Person.java
package net.lr.tutorial.karaf.db.examplejpa;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "Person")
public class Person
{
private String name;
private String twitterName;
public Person()
{
}
public Person(String name, String twitterName)
{
super();
this.name = name;
this.twitterName = twitterName;
}
@Id
@Column(name = "name", unique = true)
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
@Column(name = "twitterName")
public String getTwitterName()
{
return twitterName;
}
public void setTwitterName(String twitterName)
{
this.twitterName = twitterName;
}
}
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>info.leonard.orm</groupId>
<artifactId>leonard-orm-native</artifactId>
<version>1.0.0</version>
<packaging>bundle</packaging>
<properties>
<log4j-version>1.2.16</log4j-version>
<slf4j-version>1.6.1</slf4j-version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.karaf.shell</groupId>
<artifactId>org.apache.karaf.shell.console</artifactId>
<version>4.0.0.M2</version>
</dependency>
<dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.core</artifactId>
<version>4.3.1</version>
</dependency>
<dependency>
<groupId>org.osgi</groupId>
<artifactId>org.osgi.enterprise</artifactId>
<version>4.2.0</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j-version}</version>
</dependency>
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>4.3.6.Final</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-osgi</artifactId>
<version>4.3.6.Final</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>4.3.6.Final</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate.common</groupId>
<artifactId>hibernate-commons-annotations</artifactId>
<version>4.0.4.Final</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.35</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.7</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j-version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${slf4j-version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<version>2.5.3</version>
<extensions>true</extensions>
<configuration>
<instructions>
<Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
<Meta-Persistence>META-INF/persistence.xml</Meta-Persistence>
<Import-Package>
org.apache.felix.service.command;version="[0.6,1)",
org.apache.felix.gogo.commands;version="[0.6,1)",
org.apache.karaf.shell.console;version="[2.2,4)",
*,
org.hibernate.jpa,
org.hibernate.proxy,
javassist.util.proxy
</Import-Package>
</instructions>
</configuration>
</plugin>
</plugins>
</build>
</project>
PersonServiceImpl.java
package net.lr.tutorial.karaf.db.examplejpa.impl;
import java.util.List;
import javax.persistence.EntityManager;
import net.lr.tutorial.karaf.db.examplejpa.Person;
import net.lr.tutorial.karaf.db.examplejpa.PersonService;
public class PersonServiceImpl implements PersonService
{
private EntityManager em;
public void setEntityManager(EntityManager em)
{
this.em = em;
}
public void add(Person person)
{
em.persist(person);
em.flush();
}
public void deleteAll()
{
em.createQuery("delete from Person").executeUpdate();
em.flush();
}
public List<Person> getAll()
{
return em.createQuery("select p from Person p", Person.class).getResultList();
}
}
我重新启动了我的 karaf 实例，并查看了启动后的日志。以下项目引起了我的注意：
2015-06-06 04:17:02,988 | WARN | FelixStartLevel | aries | 144 - org.apache.aries.jpa.blueprint.aries - 1.0.4 | Managed persistence context support is no longer available for use with the Aries Blueprint container.
请注意，我的示例使用的是容器管理的 JPA。看起来很奇怪，这实际上不受支持，但会在周末尝试非托管 JPA 实现。
我已将原始 post 中列出的相同代码部署到 Apache Karaf 3.0.3 实例，代码运行良好。问题出在 Apache Karaf 4.0.0 M2，更具体地说是 Apache Aries v1.0.4。
如前所述 posted，Aries 1.0.4 在 Karaf 4.0.0 M2 中启动时生成以下警告
2015-06-06 04:17:02,988 | WARN | FelixStartLevel | aries | 144 - org.apache.aries.jpa.blueprint.aries - 1.0.4 | Managed persistence context support is no longer available for use with the Aries Blueprint container.
此警告表明 Aries 现在在 blueprint.xml 文件中声明工件时遇到问题。
Christian Schneider 写了一篇 post 说明 Aries 现在如何使用注解来声明上下文： http://www.liquid-reality.de/display/liquid/New+design+for+aries+jpa
我还没有尝试过这些注释，但会留给其他人来确认 Aries 1.0.4（因此 Karaf 4.0.0）不再支持在 blueprint.xml 文件中声明上下文。