Hyz*_*ual 7 java osgi jdbc openjpa aries
我目前正在研究Felix的OSGi项目(v4.0.3).我需要使用JPA,所以我安装了Apache Aries JPA包.我还安装了OpenJPA,我需要它使用MySQL Connector Bundle连接到MySQL数据库.不幸的是它不起作用,OpenJPA说它无法找到MySQL JDBC类,我无法弄清楚什么是坏的,也许我做错了.我将在下面解释我安装的内容以及persistence.xml文件和我得到的实际异常.
这是我安装的Apache Aries软件包列表:
然后我安装了那些Apache Aries JPA包的依赖项.我从Springsource下载了它们:
我还安装了OpenJPA及其所有依赖项.我在apache-openjpa-2.2.0下载文件夹的lib文件夹中找到了bundle 2到5(commons-*).我在这里下载了Serp ,因为在lib文件夹中找到的jar不是OSGi包.最后我找到了Springsource中的最后两个包(#7和#8):
一旦我最终安装了OpenJPA,我仍然需要MySQL JDBC Driver包,我也从Springsource存储库获得了它的commons-logging依赖:
现在,此时安装的软件包列表变得非常庞大.我说我安装了OpenJPA,但这只是因为我无法弄清楚如何使用任何其他提供商与Aries.我最初想使用EclipseLink,但显然Apache Aries没有检测到它作为提供者,根据这个博客,你必须制作另一个包含你自己的激活器的包,让Aries注意到EclipseLink.我尝试了但它没有用,所以我又回到了使用OpenJPA.
所以现在我有两个问题:
或者:
这是我使用的persistence.xml文件:
<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" xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="userManager.model" transaction-type="RESOURCE_LOCAL">
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
<class>org.project.dao.entity.UserEntity</class>
<properties>
<property name="openjpa.ConnectionDriverName" value="com.mysql.jdbc.Driver" />
<property name="openjpa.ConnectionURL" value="jdbc:mysql://localhost:3306/usermanager?autoReconnect=true" />
<property name="openjpa.ConnectionUserName" value="root" />
<property name="openjpa.ConnectionPassword" value="root" />
</properties>
</persistence-unit>
</persistence>
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执行以下DAO类的构造函数时发生错误:
@PersistenceContext(unitName="userManager.model")
private EntityManager em;
private EntityManagerFactory emf;
public UserDAOBean() {
em = emf.createEntityManager();
}
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这是我在OpenJPA找不到MySQL时遇到的错误.当然值得一提的是URL和用户名/密码都有效:
<openjpa-2.2.0-r422266:1244990 nonfatal general error> org.apache.openjpa.persistence.PersistenceException: There were errors initializing your configuration: <openjpa-2.2.0-r422266:1244990 fatal user error> org.apache.openjpa.util.UserException: A connection could not be obtained for driver class "com.mysql.jdbc.Driver" and URL "jdbc:mysql://localhost:3306/usermanager?autoReconnect=true". You may have specified an invalid URL.
at org.apache.openjpa.jdbc.schema.DataSourceFactory.newConnectException(DataSourceFactory.java:255)
at org.apache.openjpa.jdbc.schema.DataSourceFactory.newDataSource(DataSourceFactory.java:123)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.createConnectionFactory(JDBCConfigurationImpl.java:844)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getConnectionFactory(JDBCConfigurationImpl.java:732)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.openjpa.lib.conf.ConfigurationImpl.instantiateAll(ConfigurationImpl.java:295)
at org.apache.openjpa.conf.OpenJPAConfigurationImpl.instantiateAll(OpenJPAConfigurationImpl.java:1671)
at org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:646)
at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:203)
at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:156)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:227)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:154)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:60)
at org.apache.aries.jpa.container.impl.CountingEntityManagerFactory.createEntityManager(CountingEntityManagerFactory.java:64)
at javax.persistence.EntityManagerFactory$$Proxy.createEntityManager(Unknown Source)
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我已经删除了异常(它一直在继续),直到这一点:
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver not found by org.apache.openjpa [12]
at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1460)
at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:72)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1843)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.apache.openjpa.jdbc.schema.DataSourceFactory.newDataSource(DataSourceFactory.java:85)
... 108 more
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PS:由于垃圾邮件限制,我无法发布链接到Aries,OpenJPA或EclipseLink,抱歉:/
感谢霍莉·康明斯(Holly Cummins),经过又一个小时的研究,我已经找到了解决问题的方法。我将在下面详细说明,这将是一个很长的答案。
如果您想将EclipseLink与 Apache Aries 一起使用(我发现它的安装比 OpenJPA for OSGi 简单几个数量级,因为它只包含在5个包中),您将必须直接从 apache 检出 EclipseLink - Aries 适配器,因为它还没有被安装。尚未释放。
转到适当的文件夹并执行以下命令来获取它:
svn checkout https://svn.apache.org/repos/asf/aries/trunk/jpa/jpa-container-eclipselink-adapter/
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您应该获得一个名为jpa-container-eclipselink-adapter的文件夹。现在,假设您使用的是 Linux 并安装了 Maven,请运行以下命令:
cd jpa-container-eclipselink-adapter
mvn clean install
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一旦 Maven 成功编译了适配器的源代码,您将使用以下路径在 Maven 存储库中找到它
<maven-repo>/org/apache/aries/jpa/org.apache.aries.jpa.eclipselink.adapter/0.3.1-SNAPSHOT/org.apache.aries.jpa.eclipselink.adapter-0.3.1-SNAPSHOT.jar
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您必须将此捆绑包与其他捆绑包一起部署(将其复制到Felix 的捆绑包文件夹中)。
这就是 EclipseLink 部分,现在为了让您的持久性真正发挥作用,您必须将 Blueprint 与 Aries 结合使用。以下是您需要从 [http://aries.apache.org/downloads/currentrelease.html](Apache Aries 下载页面)获取的所有捆绑包的列表
下载完 Aries 后,您仍然需要依赖项(从 SpringSource 获取它们)。这些是 SLF4J、Log4J、SLF4J Log4J Binding 和 javax.transaction 1.1 API 的捆绑包。
您还需要 EclipseLink 中的捆绑包(您需要 OSGi 捆绑包版本)
http://www.eclipse.org/eclipselink/downloads/
打开 zip 并获取以下文件:
最后,假设您想要使用 MySQL 数据库,您将需要 MySQL JDBC 驱动程序的捆绑包(从 Springsource 下载)
安装完所有这些包后,您需要使用通过 JNDI 获取的非 jta 数据源。这是一个 persistence.xml 文件,您可以根据需要进行更改:
<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" xmlns="http://java.sun.com/xml/ns/persistence">
<persistence-unit name="userManager" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<non-jta-data-source>osgi:service/javax.sql.DataSource/(osgi.jndi.service.name=jdbc/userManagerDS)</non-jta-data-source>
<class>com.example.dao.entity.UserEntity</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<properties>
<!-- EclipseLink should create the database schema automatically -->
<!-- <property name="eclipselink.ddl-generation" value="create-tables" />
<property name="eclipselink.ddl-generation.output-mode" value="database" /> -->
</properties>
</persistence-unit>
</persistence>
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看到非 jta-data-source 标记中的javax.sql.Datasource了吗?这就是我们将使用 Blueprint xml 定义的内容。为此,您首先需要在持久性捆绑包(包含 DAO 和实体的捆绑包)中添加OSGI-INF/blueprint/文件夹。这是蓝图 xml 文件所在的默认文件夹,位于此处的任何 xml 文件都将被扫描。完成后,创建blueprint.xml文件(名称可以更改)并粘贴(并修改)以下代码:
<bean id="dataSource" class="com.mysql.jdbc.jdbc2.optional.MysqlDataSource">
<property name="url" value="jdbc:mysql://localhost:3306/usermanager?autoReconnect=true" />
<property name="user" value="root" />
<property name="password" value="root" />
</bean>
<service id="MySQLDataSource" interface="javax.sql.DataSource" ref="dataSource">
<service-properties>
<entry key="osgi.jndi.service.name" value="jdbc/userManagerDS" />
</service-properties>
</service>
<service id="userDAOService" interface="com.example.dao.remote.UserDAORemote">
<bean class="com.example.dao.beans.UserDAOBean">
<jpa:unit index="0" unitname="userManager" />
</bean>
</service>
</blueprint>
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在这里,我们正在做两件事。首先,我们告诉 Aries 创建userManagerDS数据源并使用 JDBC 驱动程序、URL、用户和密码对其进行配置。这与我们在persistence.xml文件中使用的数据源相同。
然后,我们将EntityManagerFactory注入到 DAO 中。我们的DAO是com.example.dao.beans.UserDAOBean类,我们需要将其名称添加到bean标签中。这个类必须实现一个接口,我们需要将此接口添加到服务标记中。现在,最后的jpa:unit标记告诉 Aries 使用 UserDAOBean 的第一个构造函数注入与名为userManager的持久性单元(与我们在 persistence.xml 中使用的名称相同)相关的 EntityManagerFactory。这是通过使用 index="0" 属性来完成的。这也意味着您的 DAO 中必须有一些如下代码:
private EntityManager em;
private EntityManagerFactory emf;
public UserDAOBean(EntityManagerFactory emf) {
this.emf = emf;
this.em = emf.createEntityManager();
}
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也可以使用 setter 注入 EMF。以下是帮助您使用 Blueprint 的更多资源:
可选:请小心,如果您使用 Felix,添加 javax.transaction 捆绑包将导致“使用约束冲突”,因为系统捆绑包(捆绑包 0)也导出此 API。您必须通过更改config.properties中的以下行来阻止其导出:
#org.osgi.framework.system.packages=
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您必须在此处放入上一个包导出的所有包的列表。不幸的是,没有办法“删除”包,您必须重新定义要导出的整个包列表。这是我的,我希望它有所帮助(是的,它非常非常长):
org.osgi.framework.system.packages=org.osgi.framework;version=1.6.0, org.osgi.framework.launch;version=1.0.0, org.osgi.framework.wiring;version=1.0.0, org.osgi.framework.startlevel;version=1.0.0, org.osgi.framework.hooks.bundle;version=1.0.0, org.osgi.framework.hooks.resolver;version=1.0.0, org.osgi.framework.hooks.service;version=1.1.0, org.osgi.framework.hooks.weaving;version=1.0.0, org.osgi.service.packageadmin;version=1.2.0, org.osgi.service.startlevel;version=1.1.0, org.osgi.service.url;version=1.0.0, org.osgi.util.tracker;version=1.5.0, javax.accessibility;version=0.0.0.1_006_JavaSE, javax.activation;version=0.0.0.1_006_JavaSE, javax.activity;version=0.0.0.1_006_JavaSE, javax.annotation.processing;version=0.0.0.1_006_JavaSE, javax.annotation;version=0.0.0.1_006_JavaSE, javax.crypto.interfaces;version=0.0.0.1_006_JavaSE, javax.crypto.spec;version=0.0.0.1_006_JavaSE, javax.crypto;version=0.0.0.1_006_JavaSE, javax.imageio.event;version=0.0.0.1_006_JavaSE, javax.imageio.metadata;version=0.0.0.1_006_JavaSE, javax.imageio.plugins.bmp;version=0.0.0.1_006_JavaSE, javax.imageio.plugins.jpeg;version=0.0.0.1_006_JavaSE, javax.imageio.spi;version=0.0.0.1_006_JavaSE, javax.imageio.stream;version=0.0.0.1_006_JavaSE, javax.imageio;version=0.0.0.1_006_JavaSE, javax.jws.soap;version=0.0.0.1_006_JavaSE, javax.jws;version=0.0.0.1_006_JavaSE, javax.lang.model.element;version=0.0.0.1_006_JavaSE, javax.lang.model.type;version=0.0.0.1_006_JavaSE, javax.lang.model.util;version=0.0.0.1_006_JavaSE, javax.lang.model;version=0.0.0.1_006_JavaSE, javax.management.loading;version=0.0.0.1_006_JavaSE, javax.management.modelmbean;version=0.0.0.1_006_JavaSE, javax.management.monitor;version=0.0.0.1_006_JavaSE, javax.management.openmbean;version=0.0.0.1_006_JavaSE, javax.management.relation;version=0.0.0.1_006_JavaSE, javax.management.remote.rmi;version=0.0.0.1_006_JavaSE, javax.management.remote;version=0.0.0.1_006_JavaSE, javax.management.timer;version=0.0.0.1_006_JavaSE, javax.management;version=0.0.0.1_006_JavaSE, javax.naming.directory;version=0.0.0.1_006_JavaSE, javax.naming.event;version=0.0.0.1_006_JavaSE, javax.naming.ldap;version=0.0.0.1_006_JavaSE, javax.naming.spi;version=0.0.0.1_006_JavaSE, javax.naming;version=0.0.0.1_006_JavaSE, javax.net.ssl;version=0.0.0.1_006_JavaSE, javax.net;version=0.0.0.1_006_JavaSE, javax.print.attribute.standard;version=0.0.0.1_006_JavaSE, javax.print.attribute;version=0.0.0.1_006_JavaSE, javax.print.event;version=0.0.0.1_006_JavaSE, javax.print;version=0.0.0.1_006_JavaSE, javax.rmi.CORBA;version=0.0.0.1_006_JavaSE, javax.rmi.ssl;version=0.0.0.1_006_JavaSE, javax.rmi;version=0.0.0.1_006_JavaSE, javax.script;version=0.0.0.1_006_JavaSE, javax.security.auth.callback;version=0.0.0.1_006_JavaSE, javax.security.auth.kerberos;version=0.0.0.1_006_JavaSE, javax.security.auth.login;version=0.0.0.1_006_JavaSE, javax.security.auth.spi;version=0.0.0.1_006_JavaSE, javax.security.auth.x500;version=0.0.0.1_006_JavaSE, javax.security.auth;version=0.0.0.1_006_JavaSE, javax.security.cert;version=0.0.0.1_006_JavaSE, javax.security.sasl;version=0.0.0.1_006_JavaSE, javax.sound.midi.spi;version=0.0.0.1_006_JavaSE, javax.sound.midi;version=0.0.0.1_006_JavaSE, javax.sound.sampled.spi;version=0.0.0.1_006_JavaSE, javax.sound.sampled;version=0.0.0.1_006_JavaSE, javax.sql.rowset.serial;version=0.0.0.1_006_JavaSE, javax.sql.rowset.spi;version=0.0.0.1_006_JavaSE, javax.sql.rowset;version=0.0.0.1_006_JavaSE, javax.sql;version=0.0.0.1_006_JavaSE, javax.swing.border;version=0.0.0.1_006_JavaSE, javax.swing.colorchooser;version=0.0.0.1_006_JavaSE, javax.swing.event;version=0.0.0.1_006_JavaSE, javax.swing.filechooser;version=0.0.0.1_006_JavaSE, javax.swing.plaf.basic;version=0.0.0.1_006_JavaSE, javax.swing.plaf.metal;version=0.0.0.1_006_JavaSE, javax.swing.plaf.multi;version=0.0.0.1_006_JavaSE, javax.swing.plaf.synth;version=0.0.0.1_006_JavaSE, javax.swing.plaf;version=0.0.0.1_006_JavaSE, javax.swing.table;version=0.0.0.1_006_JavaSE, javax.swing.text.html.parser;version=0.0.0.1_006_JavaSE, javax.swing.text.html;version=0.0.0.1_006_JavaSE, javax.swing.text.rtf;version=0.0.0.1_006_JavaSE, javax.swing.text;version=0.0.0.1_006_JavaSE, javax.swing.tree;version=0.0.0.1_006_JavaSE, javax.swing.undo;version=0.0.0.1_006_JavaSE, javax.swing;version=0.0.0.1_006_JavaSE, javax.tools;version=0.0.0.1_006_JavaSE, javax.transaction.xa;version=0.0.0.1_006_JavaSE, javax.transaction;version=0.0.0.1_006_JavaSE, javax.xml.bind.annotation.adapters;version=0.0.0.1_006_JavaSE, javax.xml.bind.annotation;version=0.0.0.1_006_JavaSE, javax.xml.bind.attachment;version=0.0.0.1_006_JavaSE, javax.xml.bind.helpers;version=0.0.0.1_006_JavaSE, javax.xml.bind.util;version=0.0.0.1_006_JavaSE, javax.xml.bind;version=0.0.0.1_006_JavaSE, javax.xml.crypto.dom;version=0.0.0.1_006_JavaSE, javax.xml.crypto.dsig.dom;version=0.0.0.1_006_JavaSE, javax.xml.crypto.dsig.keyinfo;version=0.0.0.1_006_JavaSE, javax.xml.crypto.dsig.spec;version=0.0.0.1_006_JavaSE, javax.xml.crypto.dsig;version=0.0.0.1_006_JavaSE, javax.xml.crypto;version=0.0.0.1_006_JavaSE, javax.xml.datatype;version=0.0.0.1_006_JavaSE, javax.xml.namespace;version=0.0.0.1_006_JavaSE, javax.xml.parsers;version=0.0.0.1_006_JavaSE, javax.xml.soap;version=0.0.0.1_006_JavaSE, javax.xml.stream.events;version=0.0.0.1_006_JavaSE, javax.xml.stream.util;version=0.0.0.1_006_JavaSE, javax.xml.stream;version=0.0.0.1_006_JavaSE, javax.xml.transform.dom;version=0.0.0.1_006_JavaSE, javax.xml.transform.sax;version=0.0.0.1_006_JavaSE, javax.xml.transform.stax;version=0.0.0.1_006_JavaSE, javax.xml.transform.stream;version=0.0.0.1_006_JavaSE, javax.xml.transform;version=0.0.0.1_006_JavaSE, javax.xml.validation;version=0.0.0.1_006_JavaSE, javax.xml.ws.handler.soap;version=0.0.0.1_006_JavaSE, javax.xml.ws.handler;version=0.0.0.1_006_JavaSE, javax.xml.ws.http;version=0.0.0.1_006_JavaSE, javax.xml.ws.soap;version=0.0.0.1_006_JavaSE, javax.xml.ws.spi;version=0.0.0.1_006_JavaSE, javax.xml.ws.wsaddressing;version=0.0.0.1_006_JavaSE, javax.xml.ws;version=0.0.0.1_006_JavaSE, javax.xml.xpath;version=0.0.0.1_006_JavaSE, javax.xml;version=0.0.0.1_006_JavaSE, org.ietf.jgss;version=0.0.0.1_006_JavaSE, org.omg.CORBA.DynAnyPackage;version=0.0.0.1_006_JavaSE, org.omg.CORBA.ORBPackage;version=0.0.0.1_006_JavaSE, org.omg.CORBA.TypeCodePackage;version=0.0.0.1_006_JavaSE, org.omg.CORBA.portable;version=0.0.0.1_006_JavaSE, org.omg.CORBA;version=0.0.0.1_006_JavaSE, org.omg.CORBA_2_3.portable;version=0.0.0.1_006_JavaSE, org.omg.CORBA_2_3;version=0.0.0.1_006_JavaSE, org.omg.CosNaming.NamingContextExtPackage;version=0.0.0.1_006_JavaSE, org.omg.CosNaming.NamingContextPackage;version=0.0.0.1_006_JavaSE, org.omg.CosNaming;version=0.0.0.1_006_JavaSE, org.omg.Dynamic;version=0.0.0.1_006_JavaSE, org.omg.DynamicAny.DynAnyFactoryPackage;version=0.0.0.1_006_JavaSE, org.omg.DynamicAny.DynAnyPackage;version=0.0.0.1_006_JavaSE, org.omg.DynamicAny;version=0.0.0.1_006_JavaSE, org.omg.IOP.CodecFactoryPackage;version=0.0.0.1_006_JavaSE, org.omg.IOP.CodecPackage;version=0.0.0.1_006_JavaSE, org.omg.IOP;version=0.0.0.1_006_JavaSE, org.omg.Messaging;version=0.0.0.1_006_JavaSE, org.omg.PortableInterceptor.ORBInitInfoPackage;version=0.0.0.1_006_JavaSE, org.omg.PortableInterceptor;version=0.0.0.1_006_JavaSE, org.omg.PortableServer.CurrentPackage;version=0.0.0.1_006_JavaSE, org.omg.PortableServer.POAManagerPackage;version=0.0.0.1_006_JavaSE, org.omg.PortableServer.POAPackage;version=0.0.0.1_006_JavaSE, org.omg.PortableServer.ServantLocatorPackage;version=0.0.0.1_006_JavaSE, org.omg.PortableServer.portable;version=0.0.0.1_006_JavaSE, org.omg.PortableServer;version=0.0.0.1_006_JavaSE, org.omg.SendingContext;version=0.0.0.1_006_JavaSE, org.omg.stub.java.rmi;version=0.0.0.1_006_JavaSE, org.w3c.dom.bootstrap;version=0.0.0.1_006_JavaSE, org.w3c.dom.events;version=0.0.0.1_006_JavaSE, org.w3c.dom.ls;version=0.0.0.1_006_JavaSE, org.w3c.dom;version=0.0.0.1_006_JavaSE, org.xml.sax.ext;version=0.0.0.1_006_JavaSE, org.xml.sax.helpers;version=0.0.0.1_006_JavaSE, org.xml.sax;version=0.0.0.1_006_JavaSE
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