如何安装 postgresqljdbc 以在 Karaf OSGi 中工作？

Question

我想在 Karaf 中安装 org.postgresql/postgresql/9.4-1201-jdbc41 但出现错误。如何解决这些错误？奇怪的是，在 Windows 上，我的 Karaf 的 Postgres jdbc 没有错误，但在 Ubuntu 上却有这些错误。任何线索表示赞赏。

Install Kar feature social_importer.kar/1.0-SNAPSHOT
java.lang.Exception: Could not start bundle    
mvn:org.postgresql/postgresql/9.4-1201-jdbc41 in feature(s) 

T: Unresolved constraint in bundle org.postgresql.jdbc41 
[127]: Unable to resolve 127.0: missing requirement [127.0]
osgi.wiring.package; (osgi.wiring.package=javax.transaction.xa)


Caused by: org.osgi.framework.BundleException: 
Unresolved constraint in bundle org.postgresql.jdbc41 [127]: Unable 
to resolve 127.0: missing requirement [127.0] osgi.wiring.package;
(osgi.wiring.package=javax.transaction.xa)

这可能与Apache Felix not able to access Postgres JDBC有关

---

karaf@root()> install -s wrap:mvn:postgresql/postgresql/9.4-1201-jdbc41
Bundle IDs:
Error executing command: Error installing bundles:
    Unable to install bundle wrap:mvn:postgresql/postgresql/9.4-1201-jdbc41
karaf@root()> install -s mvn:postgresql/postgresql/9.4-1201-jdbc41
Bundle IDs:
Error executing command: Error installing bundles:
    Unable to install bundle mvn:postgresql/postgresql/9.4-1201-jdbc41
karaf@root()>

---

我查看了日志级别为 INFO 的 Karaf 日志。

Caused by: java.lang.NoClassDefFoundError: org/osgi/service/jdbc/DataSourceFactory
    at org.postgresql.osgi.PGBundleActivator.start(PGBundleActivator.java:32)
    at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)
    at org.apache.felix.framework.Felix.activateBundle(Felix.java:2154)
    ... 11 more
Caused by: java.lang.ClassNotFoundException: org.osgi.service.jdbc.DataSourceFactory not found by org.postgresql.jdbc41 [5328]
    at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1556)[org.apache.felix.framework-4.4.1.jar:]
    at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:77)[org.apache.felix.framework-4.4.1.jar:]
    at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1993)[org.apache.felix.framework-4.4.1.jar:]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)[:1.8.0_25]

Answer 1

将 Postgresql JDBC 驱动程序配置到 Karaf 4.0.1

        __ __                  ____
       / //_/____ __________ _/ __/
      / ,<  / __ `/ ___/ __ `/ /_
     / /| |/ /_/ / /  / /_/ / __/
    /_/ |_|\__,_/_/   \__,_/_/

  Apache Karaf (4.0.1)

Hit '<tab>' for a list of available commands
and '[cmd] --help' for help on a specific command.
Hit '<ctrl-d>' or type 'system:shutdown' or 'logout' to shutdown Karaf.
karaf@root()> feature:repo-add mvn:org.ops4j.pax.jdbc/pax-jdbc-features/0.7.0/xml/features
karaf@root()>feature:install  pax-jdbc-spec
karaf@root()>feature:install transaction
karaf@root()>bundle:install -s mvn:org.postgresql/postgresql/9.4-1200-jdbc41
karaf@root()> service:list org.osgi.service.jdbc.DataSourceFactory

[org.osgi.service.jdbc.DataSourceFactory]
-----------------------------------------
 osgi.jdbc.driver.class = org.postgresql.Driver
 osgi.jdbc.driver.name = PostgreSQL JDBC Driver
 osgi.jdbc.driver.version = PostgreSQL 9.4 JDBC4.1 (build 1200)
 service.bundleid = 52
 service.id = 113
 service.scope = singleton
Provided by :
 PostgreSQL JDBC Driver JDBC41 (52)

为 Karaf 4.0.1 定义 Postgres 池数据源

理论在：https://ops4j1.jira.com/wiki/display/PAXJDBC/Create+DataSource+from+config

karaf@root()>feature:install  pax-jdbc-config
karaf@root()>feature:install  pax-jdbc-pool-dbcp2

在KARAF_HOME/etc/org.ops4j.datasource-companymanager.cfg 下创建文件 其中companymanager 是数据源名称。

osgi.jdbc.driver.name=PostgreSQL JDBC Driver-pool-xa

serverName=localhost
databaseName=companymanager
portNumber=5432
user=postgres
password=admin
dataSourceName=companymanager

您已经完成了，您的数据源已暴露给 OSGI 注册表，随时可以使用：

karaf@root()> service:list javax.sql.DataSource
[javax.sql.DataSource]
----------------------
 databaseName = companymanager
 dataSourceName = companymanager
 felix.fileinstall.filename = file:/C:/apache-karaf-4.0.1/etc/org.ops4j.datasource-companymanager.cfg
 osgi.jdbc.driver.name = PostgreSQL JDBC Driver-pool-xa
 osgi.jndi.service.name = companymanager
 password = admin
 portNumber = 5432
 serverName = localhost
 service.bundleid = 64
 service.factoryPid = org.ops4j.datasource
 service.id = 119
 service.pid = org.ops4j.datasource.3cad9abf-49be-4868-8940-1623481b1363
 service.scope = singleton
 user = postgres
Provided by :
 OPS4J Pax JDBC Config (64)

如果您有兴趣，下一步可能会设置 JPA，您可以继续阅读并从以下位置获取完整的示例代码： https://github.com/antoniomaria/karaf4-eclipselink-jpa

Answer 2

刚刚用 Karaf 4.0.0.M2 测试过： OSGi 纲要导出 org.osgi.service.jdbc

        __ __                  ____      
       / //_/____ __________ _/ __/      
      / ,<  / __ `/ ___/ __ `/ /_        
     / /| |/ /_/ / /  / /_/ / __/        
    /_/ |_|\__,_/_/   \__,_/_/         

  Apache Karaf (4.0.0.M2)

Hit '<tab>' for a list of available commands
and '[cmd] --help' for help on a specific command.
Hit '<ctrl-d>' or type 'system:shutdown' or 'logout' to shutdown Karaf.

karaf@root()> feature:install transaction
karaf@root()> install -s mvn:org.osgi/org.osgi.compendium/5.0.0
Bundle ID: 51
karaf@root()> install -s wrap:mvn:org.postgresql/postgresql/9.4-1201-   jdbc41
Bundle ID: 52
karaf@root()> list
START LEVEL 100 , List Threshold: 50
ID | State  | Lvl | Version            | Name                         
----------------------------------------------------------------------
51 | Active |  80 | 5.0.0.201305092017 | osgi.cmpn                    
52 | Active |  80 | 9.4.0.build-1201   | PostgreSQL JDBC Driver JDBC41
karaf@root()>

Answer 3

Apache Karaf 数据源 (JDBC) 是一项可选的企业功能。为了安装 postgresql，请使用以下语句。

karaf@root()> 功能：安装 jdbc

karaf@root()> 安装 -s mvn:org.postgresql/postgresql/9.4-1203-jdbc42

以上方案在 Karaf 4.0.1 上测试