Tomcat 中的 Java JNDI : BeanCreationException/NamingException on global Resource. 寻找全局资源返回的相同类

Question

我不明白什么会导致 Bean 创建异常代表返回所需的相同类。

该类是com.mchange.v2.c3p0.ComboPooledDataSource，错误表明预计返回 [com .mchange.v2.c3p0.ComboPooledDataSource]，但返回 [com.mchange.v2.c3p0.ComboPooledDataSource] 的实例

这是错误:

org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'dataSourceGCA' defined in class path resource [META-INF/xxxxx-security-app.xml]: 
Invocation of init method failed; nested exception is javax.naming.NamingException: 
The local resource link [dataSourceGCA2] that refers to global resource [jdbc/dataSourceGCA2Global] was expected to return an instance of [com.mchange.v2.c3p0.ComboPooledDataSource] but returned an instance of [com.mchange.v2.c3p0.ComboPooledDataSource]

我使用的是 Java 7 和 Tomcat 7。

这是数据源的配置:

在context.xml中:

<ResourceLink name="jdbc/dataSourceGCA2"
  global="jdbc/dataSourceGCA2Global"
  auth="Container"
  type="com.mchange.v2.c3p0.ComboPooledDataSource" />

在server.xml中:

<Resource description="whatever"
  name="jdbc/dataSourceGCA2Global"
  auth="Container"
  factory="org.apache.naming.factory.BeanFactory"
  type="com.mchange.v2.c3p0.ComboPooledDataSource"
  user="xxxxxxxx"
  password="xxxxxxxx"
  initialPoolSize="1"
  minPoolSize="1"
  maxPoolSize="5"
  acquireIncrement="1"
  driverClass="oracle.jdbc.driver.OracleDriver"
  jdbcUrl="jdbc:oracle:thin:@tprodva2:1522/BD2"
  testConnectionOnCheckin="true"
  idleConnectionTestPeriod="300"
  maxIdleTimeExcessConnections="0"
  maxIdleTime="0" />

什么会导致这种行为？

感谢任何帮助。

Answer 1

(本来想发表评论，但我的声誉太低了)

这可能是由两个不同的类加载器加载同一个类引起的。