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我正在尝试运行此示例http://svn.apache.org/viewvc/commons/proper/dbcp/trunk/doc/PoolingDataSourceExample.java?view=markup但不知何故我无法做到。我想在一个 maven 项目中运行这个例子,而且我也是第一次在 maven 项目上工作。而且我不知道该怎么做。就像在那个例子中一样,它清楚地表明——

To compile this example, you'll want:
  * commons-pool-1.5.4.jar
  * commons-dbcp-1.2.2.jar
  * j2ee.jar (for the javax.sql classes)
 in your classpath.

 To run this example, you'll want:
  * commons-pool-1.5.6.jar
  * commons-dbcp-1.3.jar (JDK 1.4-1.5) or commons-dbcp-1.4 (JDK 1.6+)
  * j2ee.jar (for the javax.sql classes)
  * the classes for your (underlying) JDBC driver
 in your classpath.

因此,在阅读了各种文章后,我尝试将所有这些依赖项添加到我的 pom.xml 文件中。但是我仍然遇到错误,例如-

ConnectionFactory cannot be resolved to a type  
GenericObjectPool cannot be resolved to a type  
ObjectPool cannot be resolved to a type 
PoolableConnectionFactory cannot be resolved to a type  
PoolableConnectionFactory cannot be resolved to a type  
PoolingDataSource cannot be resolved to a type  
PoolingDataSource cannot be resolved to a type  

这是我的 pom.xml 文件。我的 pom.xml 文件中是否缺少任何内容。任何建议将不胜感激,因为这是我第一次使用 Maven 项目。

<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>
  <groupId>com.datasource.pooling</groupId>
  <artifactId>datasource.pooling</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>com.datasource.pooling</name>




  <dependencies>

  <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>11.2.0</version>
        </dependency>


<dependency>
      <groupId>commons-pool</groupId>
      <artifactId>commons-pool</artifactId>
      <version>1.5.4</version>
    </dependency>

    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.2.2</version>
    </dependency>
<!--  
<dependency>
      <groupId>commons-pool</groupId>
      <artifactId>commons-pool</artifactId>
      <version>1.5.6</version>
    </dependency>

    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.3</version>
    </dependency>
 -->

  </dependencies>
</project>

添加 j2ee.jar 文件的依赖项是什么。

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1 回答 1

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ConnectionFactory、GenericObjectPool、ObjectPool、PoolableConnectionFactory、PoolingDataSource 类可以在 jar 中的 commons-pool-{version}.jar 和 commons-dbcp-{version}.jar 中找到。

在这种情况下,您不必添加 j2ee.jar。javax.sql 包相关的类在中默认的 rt.jar 中。您必须运行的代码(http://svn.apache.org/viewvc/commons/proper/dbcp/trunk/doc/PoolingDataSourceExample.java?view=markuporg.apache.commons.dbcp2 )是从包中导入类和org.apache.commons.pool2

import org.apache.commons.pool2.ObjectPool; 
import org.apache.commons.pool2.impl.GenericObjectPool;      
import org.apache.commons.dbcp2.ConnectionFactory;   
import org.apache.commons.dbcp2.PoolingDataSource;   
import org.apache.commons.dbcp2.PoolableConnectionFactory;   
import org.apache.commons.dbcp2.DriverManagerConnectionFactory;

改为使用

import org.apache.commons.pool.ObjectPool; 
import org.apache.commons.pool.impl.GenericObjectPool;   
import org.apache.commons.dbcp.ConnectionFactory;    
import org.apache.commons.dbcp.PoolingDataSource;    
import org.apache.commons.dbcp.PoolableConnectionFactory;    
import org.apache.commons.dbcp.DriverManagerConnectionFactory;

使用org.apache.commons.pool而不是org.apache.commons.pool2从所有包导入中。这些类位于commons-pool-{version}.jarcommons-dbcp-{version}.jar jar 中。

于 2011-11-19T13:04:01.307 回答