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我一直在潛入ServiceMix 5.4.0和OSGi，並且在OpenJPA中運行了一個相當奇怪的行爲。ServiceMix無法找到OSGI數據源
我有一個像這樣定義的數據源：
<blueprint
xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.osgi.org/xmlns/blueprint/v1.0.0 http://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd">
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="org.postgresql.Driver"/>
<property name="url" value="jdbc:postgresql://localhost:5432/test"/>
<property name="username" value="test"/>
<property name="password" value="test"/>
</bean>
<service interface="javax.sql.DataSource" ref="dataSource">
<service-properties>
<entry key="osgi.jndi.service.name" value="jdbc/test"/>
</service-properties>
</service>
</blueprint>
使用JNDI：姓名命令，我可以確認的是，數據來源是可見：
[email protected]> jndi:names
JNDI Name Class Name
osgi:service/jndi org.apache.karaf.jndi.internal.JndiServiceImpl
osgi:service/jdbc/test org.apache.commons.dbcp.BasicDataSource
[email protected]>
我的persistence.xml：
<persistence version="2.0" 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">
<persistence-unit name="test" transaction-type="JTA">
<jta-data-source>osgi:service/javax.sql.DataSource/(osgi.jndi.service.name=jdbc/test)</jta-data-source>
<class>com.example.persistence.security.User</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<properties>
<property name="openjpa.jdbc.DBDictionary" value="postgres"/>
<property name="openjpa.Log" value="slf4j"/>
</properties>
</persistence-unit>
</persistence>
然後我通過藍圖將持久單元注入DAO類：
<?xml version="1.0" encoding="UTF-8"?>
<blueprint default-activation="eager"
xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
xmlns:jpa="http://aries.apache.org/xmlns/jpa/v1.0.0"
xmlns:tx="http://aries.apache.org/xmlns/transactions/v1.0.0">
<bean id="securityDAO" class="com.example.security.dao.SecurityDAOImpl" init-method="init">
<tx:transaction method="*" value="Required" />
<jpa:context property="entityManager" unitname="test" />
</bean>
<service ref="securityDAO" interface="com.example.security.dao.SecurityDAO">
</service>
</blueprint>
持久性單元被成功注入，這是我在DAO的初始化方法驗證：
public void init() {
if (em==null) {
log.error("Entity manager not found. Check JPA configuration.");
throw new RuntimeException("No EntityManager found");
}
log.info("Started SecurityDAO");
}
後我所有的辛勤工作，ServiceMix的獎勵我，當我打電話以下神祕異常從另外一個bean我的DAO的方法：
....
public void setSecurityDAO (SecurityDAO dao) {
this.dao = dao;
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String userName = req.getParameter("userName");
String password = req.getParameter("password");
// Invocation of injected DAO results in exception
User u = dao.authenticateUser(userName, password);
這將導致以下：
Caused by: java.lang.RuntimeException: The DataSource osgi:service/javax.sql.DataSource/(osgi.jndi.service.name=jdbc/test) required by bundle persistence/0.0.1.SNAPSHOT could not be found.
at org.apache.aries.jpa.container.unit.impl.JndiDataSource.getDs(JndiDataSource.java:87)
at org.apache.aries.jpa.container.unit.impl.DelayedLookupDataSource.getConnection(DelayedLookupDataSource.java:36)
at org.apache.openjpa.lib.jdbc.DelegatingDataSource.getConnection(DelegatingDataSource.java:116)
at org.apache.openjpa.lib.jdbc.DecoratingDataSource.getConnection(DecoratingDataSource.java:93)
at org.apache.openjpa.jdbc.schema.DataSourceFactory.installDBDictionary(DataSourceFactory.java:233)
... 54 more
Caused by: javax.naming.NoInitialContextException: Unable to find the InitialContextFactory org.eclipse.jetty.jndi.InitialContextFactory.
at org.apache.aries.jndi.ContextHelper.getInitialContext(ContextHelper.java:148)
at org.apache.aries.jndi.OSGiInitialContextFactoryBuilder.getInitialContext(OSGiInitialContextFactoryBuilder.java:49)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:684)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:313)
at javax.naming.InitialContext.init(InitialContext.java:244)
at javax.naming.InitialContext.<init>(InitialContext.java:216)
at org.apache.aries.jpa.container.unit.impl.JndiDataSource.getDs(JndiDataSource.java:64)
... 58 more
不知怎的，OSGi導出的數據源沒有找到進入持久性捆綁的方式。奇怪的部分是，當我將下面的代碼添加到init方法以查看是否可以執行測試查詢時，OpenJPA不僅不會在init方法中拋出異常，而且現在觸發異常的DAO的調用工程，以及：
public void init() {
if (em==null) {
log.error("Entity manager not found. Check JPA configuration.");
throw new RuntimeException("No EntityManager found");
}
try {
Query q = em.createNativeQuery("SELECT 1=1");
q.getFirstResult();
} catch (Exception ex) {
log.error("Unable to execute test query against database", ex);
throw new RuntimeException(ex);
}
log.info("Started SecurityDAO");
}
因此，要總結：如果我把從不同的包比我的DAO的方法，OpenJPA的拋出一個異常，表明它無法找到InitialNamingContext，並且沒有顯示出任何跡象它已經開始的日誌。如果在外部組件調用DAO之前執行查詢，OpenJPA可以找到InitialNamingContext，OpenJPA顯示在日誌中，隨後DAO包外部的調用開始工作。
顯然，我在這裏錯過了一些基本的東西。任何幫助或深思熟慮的解釋什麼是打破，或者我做錯了什麼，將不勝感激。
編輯：
我沒有注意到昨晚，但是當我在測試中查詢增加，以下行出現在日誌中。他們是不存在的，當我註釋掉查詢：
... | Runtime | 220 - org.apache.openjpa - 2.3.0 | Starting OpenJPA 2.3.0
... | JDBC | 220 - org.apache.openjpa - 2.3.0 | Using dictionary class "org.apache.openjpa.jdbc.sql.PostgresDictionary".
... | JDBC | 220 - org.apache.openjpa - 2.3.0 | Connected to PostgreSQL version 9.9 using JDBC driver PostgreSQL Native Driver version PostgreSQL 9.3 JDBC4.1 (build 1102).
編輯2：
試圖在普通的香草Karaf 3.0.3，並得到了同樣的錯誤。作爲一種解決方法，我在執行上述測試查詢的捆綁軟件中創建了一個單獨的bean。顯然，只要包中的單個bean在包之外的bean試圖進行調用之前調用OpenJPA，OpenJPA就會被正確初始化。
由於我在OpenJPA/ServiceMix文檔中沒有提及，所以我只能假設我在配置中的其他地方做錯了什麼。
編輯3：
每約翰·福斯，這裏是MANIFEST.MF
Manifest-Version: 1.0
Bnd-LastModified: 1430533396366
Build-Jdk: 1.8.0_45
Built-By: somedude
Bundle-Blueprint: OSGI-INF/blueprint/blueprint.xml
Bundle-Description: Database access layer for Peer Review product
Bundle-ManifestVersion: 2
Bundle-Name: Example :: Persistence
Bundle-SymbolicName: persistence-jpa
Bundle-Version: 0.0.1.SNAPSHOT
Created-By: Apache Maven Bundle Plugin
Export-Package: com.example.persistence.security;version="0.0.1.SNAPSHOT",co
m.example.security.dao;version="0.0.1.SNAPSHOT";uses:="com.example.persistence.
security,javax.persistence"
Export-Service: com.example.security.dao.SecurityDAO
Import-Package: javax.persistence;version="[1.1,2)",org.osgi.service.blu
eprint;version="[1.0.0,2.0.0)",org.slf4j;version="[1.7,2)"
Meta-Persistence: META-INF/persistence.xml
Require-Capability: osgi.ee;filter:="(&(osgi.ee=JavaSE)(version=1.7))"
Tool: Bnd-2.3.0.201405100607
而且，因爲它可能是相關的，在JPA束的pom.xml中：
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>example</artifactId>
<groupId>com.example</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<artifactId>persistence-jpa</artifactId>
<packaging>bundle</packaging>
<name>Example :: Persistence</name>
<dependencies>
<dependency>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-jpa_2.0_spec</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.7</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</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>
<Meta-Persistence>META-INF/persistence.xml</Meta-Persistence>
<Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
<Bundle-Version>${project.version}</Bundle-Version>
<Import-Package>*</Import-Package>
<Export-Package>com.example.persistence*,com.example.security.*;version=${project.version}</Export-Package>
</instructions>
</configuration>
</plugin>
</plugins>
</build>
</project>
你可以發佈你的persitence包的MANIFEST.MF嗎？ –