無法加載JDBC驅動程序類

-1

我在JBoss Fuse服務器中創建了一個簡單的Apache Camel應用程序。我的駱駝藍圖無法讀取驅動程序類。無法加載JDBC驅動程序類

這是錯誤消息：

org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'oracle.jdbc.driver' 
... 
Caused by: java.lang.ClassNotFoundException: oracle.jdbc.driver from bundle 144 (fer-cdr) 
... 
Caused by: java.lang.ClassNotFoundException: oracle.jdbc.driver not found by jdbccamel 
...

這是項目結構：

+-- Root 
+== pom.xml 
+-- jdbccamel (Maven Module) 
| +-- pom.xml 
| +-- /src/main/resources/OSGI-INF/blueprint/blueprint.xml 
+-- features (Maven Modul => contains fabric feature of the project) 
| +-- pom.xml 
| +-- scr/main/resources/features.xml

的pom.xml（jdbccamel）

.... 
<dependencies> 
    <dependency> 
     <groupId>mysql</groupId> 
     <artifactId>mysql-connector-java</artifactId> 
     <version>5.1.6</version> 
    </dependency> 
    <dependency> 
     <groupId>com.oracle</groupId> 
     <artifactId>ojdbc6</artifactId> 
     <version>11.2.0.3</version> 
    </dependency> 
    <dependency> 
     <groupId>commons-pool</groupId> 
     <artifactId>commons-pool</artifactId> 
     <version>1.4</version> 
    </dependency> 
    <dependency> 
     <groupId>commons-dbcp</groupId> 
     <artifactId>commons-dbcp</artifactId> 
     <version>1.4</version> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.camel</groupId> 
     <artifactId>camel-core</artifactId> 
     <version>${camel.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.camel</groupId> 
     <artifactId>camel-blueprint</artifactId> 
     <version>${camel.version}</version> 
    </dependency> 
    <dependency> 
     <groupId>org.apache.camel</groupId> 
     <artifactId>camel-jdbc</artifactId> 
     <version>${camel.version}</version> 
    </dependency> 
</dependencies> 
<build> 
    <defaultGoal>install</defaultGoal> 
    <plugins> 
     <plugin> 
      <groupId>org.apache.felix</groupId> 
      <artifactId>maven-bundle-plugin</artifactId> 
      <version>${version.maven-bundle-plugin}</version> 
      <extensions>true</extensions> 
      <configuration> 
       <instructions> 
        <Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName> 
        <Include-Resource>{maven-resources}</Include-Resource> 
       </instructions> 
      </configuration> 
     </plugin> 
     <plugin> 
      <artifactId>maven-compiler-plugin</artifactId> 
      <version>3.5.1</version> 
      <configuration> 
       <source>1.8</source> 
       <target>1.8</target> 
      </configuration> 
     </plugin> 
    </plugins> 
</build> 
....

p om.xml（功能）

.... 
<dependencies> 
    <dependency> 
     <groupId>mysql</groupId> 
     <artifactId>mysql-connector-java</artifactId> 
     <version>5.1.6</version> 
     <scope>provided</scope> 
    </dependency> 
    <dependency> 
     <groupId>com.oracle</groupId> 
     <artifactId>ojdbc6</artifactId> 
     <version>11.2.0.3</version> 
     <scope>provided</scope> 
    </dependency> 
    <dependency> 
     <groupId>commons-pool</groupId> 
     <artifactId>commons-pool</artifactId> 
     <version>1.4</version> 
     <scope>provided</scope> 
    </dependency> 
    <dependency> 
     <groupId>commons-dbcp</groupId> 
     <artifactId>commons-dbcp</artifactId> 
     <version>1.4</version> 
     <scope>provided</scope> 
    </dependency> 
</dependencies> 
<build> 
    <defaultGoal>install</defaultGoal> 
    <plugins> 
     <plugin> 
      <groupId>org.codehaus.mojo</groupId> 
      <artifactId>build-helper-maven-plugin</artifactId> 
      <version>1.8</version> 
      <executions> 
       <execution> 
        <id>attach-artifacts</id> 
        <phase>package</phase> 
        <goals> 
         <goal>attach-artifact</goal> 
        </goals> 
        <configuration> 
         <artifacts> 
          <artifact> 
           <file>target/features/features.xml</file> 
           <type>xml</type> 
           <classifier>features</classifier> 
          </artifact> 
         </artifacts> 
        </configuration> 
       </execution> 
      </executions> 
     </plugin> 
    </plugins> 
</build> 
....

features.xml（功能）

.... 
<?xml version="1.0" encoding="UTF-8"?> 
<features name="myfeature" xmlns="http://karaf.apache.org/xmlns/features/v1.0.0"> 
    <repository>mvn:org.apache.karaf.assemblies.features/standard/2.3.0.redhat-60024/xml/features</repository> 
    <repository>mvn:org.apache.karaf.assemblies.features/enterprise/2.3.0.redhat-60024/xml/features</repository> 
    <repository>mvn:org.apache.cxf.karaf/apache-cxf/2.7.10/xml/features</repository> 
    <repository>mvn:org.apache.camel.karaf/apache-camel/2.12.3/xml/features</repository> 
    <repository>mvn:org.apache.activemq/activemq-karaf/5.8.0.redhat-60024/xml/features</repository> 
    <feature name="fer-cdr"> 
     <bundle>wrap:mvn:com.oracle/ojdbc6/11.2.0.3</bundle> 
     <bundle>wrap:mvn:mysql/mysql-connector-java/5.1.6</bundle> 
     <bundle>wrap:mvn:commons-dbcp/commons-dbcp/1.4</bundle> 
     <bundle>wrap:mvn:commons-pool/commons-pool/1.4</bundle> 
     <feature version="2.12.3">camel-core</feature> 
     <feature version="2.12.3">camel-blueprint</feature> 
     <feature version="2.12.3">camel-jdbc</feature> 
     <feature version="(3.1,4.0]">spring-jdbc</feature> 
     <bundle>mvn:com.project/jdbccamel/1.5.9</bundle> 
    </feature> 
</features> 
....

blueprint.xml（jdbccamel）

.... 
<bean class="org.apache.commons.dbcp.BasicDataSource" id="dataSource"> 
    <property name="driverClassName" value="oracle.jdbc.driver" /> 
    <property name="url" value="${cdr.url}" /> 
    <property name="username" value="${cdr.username}" /> 
    <property name="password" value="${cdr.password}" /> 
    <property name="initialSize" value="${cdr.initialSize}" /> 
    <property name="maxActive" value="${cdr.maxActive}" /> 
    <property name="testOnBorrow" value="${cdr.testOnBorrow}" /> 
    <property name="validationQuery" value="${cdr.validationQuery}" /> 
</bean> 
....

我的發現：當我maven-bundle-plugin中的import-package（請參閱jdbccamel中的pom.xml）

<Import-Package>oracle.jdbc.driver</Import-Package>

這樣的：

<plugin> 
    <groupId>org.apache.felix</groupId> 
    <artifactId>maven-bundle-plugin</artifactId> 
    <version>${version.maven-bundle-plugin}</version> 
    <extensions>true</extensions> 
    <configuration> 
     <instructions> 
      <Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName> 
      <Include-Resource>{maven-resources}</Include-Resource> 
     </instructions> 
    </configuration> 
</plugin>

的org.apache.commons.dbcp.BasicDataSource類將不加載和我得到的消息是這樣的：

org.osgi.service.resolver.ResolutionException: Unable to resolve dummy/0.0.0: missing requirement [dummy/0.0.0] osgi.identity; osgi.identity=jdbccamel; type=karaf.feature; version=0 [caused by: Unable to resolve jdbccamel/0.0.0: missing requirement [jdbccamel/0.0.0] osgi.identity; osgi.identity=jdbccamel; type=osgi.bundle; version="[1.5.9,1.5.9]" [caused by: Unable to resolve jdbccamel/1.5.9: missing requirement [jdbccamel/1.5.9] osgi.wiring.package; filter:="(osgi.wiring.package=org.apache.commons.dbcp.BasicDataSource)"]] 
    at org.apache.felix.resolver.Candidates.populateResource(Candidates.java:285) 
    at org.apache.felix.resolver.Candidates.populate(Candidates.java:153) 
    at org.apache.felix.resolver.ResolverImpl.resolve(ResolverImpl.java:148) 
    at io.fabric8.agent.DeploymentBuilder.resolve(DeploymentBuilder.java:231) 
    at io.fabric8.agent.DeploymentAgent.doUpdate(DeploymentAgent.java:567) 
    at io.fabric8.agent.DeploymentAgent$2.run(DeploymentAgent.java:293) 
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:262) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
    at java.lang.Thread.run(Thread.java:745)

當我添加兩個，像這樣：

<Import-Package>oracle.jdbc.driver,org.apache.commons.dbcp.BasicDataSource</Import-Package>

它無法加載JDBC驅動程序l之前。

來源

2017-04-12 smftr

[求助]問題是設置驅動程序類'oracle.jdbc.driver'而不是'oracle.jdbc.driver'。OracleDriver' – smftr

這在OSGi中不起作用。 BasicDataSource嘗試使用自己的類加載器來解析oracle類，而這些類沒有看到這些類。

最簡單的方法是使用OracleDataSource。在這種情況下，沒有涉及類加載器的魔法，它應該工作。當您直接參考該課程時，您的軟件包也會自動獲得Import-Package語句。

更好的方法是使用pax-jdbc。 Pax-jdbc爲大多數數據庫提供包裝，並幫助他們發佈一個DataSourceFactory，這是OSGi標準來訪問數據庫。

Pax-jdbc-config允許通過使用普通配置從DataSourceFactory創建一個DataSource。它也允許使用多個池庫。

有一個小例子，請看example。如果你不需要它，你可以省略liquibase部分。

來源

2017-04-12 10:13:09

謝謝，這可能有助於未來 – smftr

無法加載JDBC驅動程序類

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