Question

我正在尝试运行此示例http://svn.apache.org/viewvc/commons/proper/dbcp/trunk/doc/PoolingDataSourceExample.java?view=markup，但不知怎的，我无法做到这一点。我想在maven项目中运行这个例子，我也是第一次在maven项目上工作。我不知道该怎么做。在那个例子中，它明确指出 -

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.

所以我在完成各种文章之后尝试将所有这些依赖项添加到我的pom.xml文件中。但我仍然有像 -

这样的错误

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文件中是否有任何遗漏的内容。任何建议都将受到赞赏，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文件的依赖性是什么。

Answer 1

ConnectionFactory，GenericObjectPool，ObjectPool，PoolableConnectionFactory，PoolingDataSource类可以在jars 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rt.jar中，默认在jdk中。您必须运行的代码（http://svn.apache.org/viewvc/commons/proper/dbcp/trunk/doc/PoolingDataSourceExample.java?view=markup）是从包org.apache.commons.dbcp2和org.apache.commons.pool2

导入类

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;

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

配置基于DBCP的连接池以与oracle db进行交互

1 个答案: