Apache Commons Configuration：ClassNotFoundException：org.apache.commons.beanutils.DynaBean

我的POM包含：

    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-configuration2</artifactId>
        <version>2.3</version>
    </dependency>

快速入门指南，读取属性文件中的两个示例代码：

Configurations configs = new Configurations();
try
{
    Configuration config = configs.properties(new File("config.properties"));
    // access configuration properties
    ...
}
catch (ConfigurationException cex)
{
    // Something went wrong
}

和Properties文件，使用PropertiesConfiguration：

Parameters params = new Parameters();
FileBasedConfigurationBuilder<FileBasedConfiguration> builder =
    new FileBasedConfigurationBuilder<FileBasedConfiguration>(PropertiesConfiguration.class)
    .configure(params.properties()
        .setFileName("usergui.properties"));
try
{
    Configuration config = builder.getConfiguration();
    ...
}
catch(ConfigurationException cex)
{
    // loading of the configuration file failed
}

抛出：

java.lang.NoClassDefFoundError: org/apache/commons/beanutils/DynaBean
...
at org.apache.commons.configuration2.builder.fluent.Parameters.createParametersProxy(Parameters.java:307)
at org.apache.commons.configuration2.builder.fluent.Parameters.fileBased(Parameters.java:186)
at properties.PropertiesTest.testLoadAndStoreWithCommonsConfiguration(PropertiesTest.java:52)
...
Caused by: java.lang.ClassNotFoundException: org.apache.commons.beanutils.DynaBean

mvn dependency:tree 显示：

...
[INFO] +- org.apache.commons:commons-configuration2:jar:2.2:compile
[INFO] |  +- org.apache.commons:commons-lang3:jar:3.6:compile
[INFO] |  \- commons-logging:commons-logging:jar:1.2:compile
...

commons-configuration2的POM包含：

    ...
    <dependency>
        <groupId>commons-beanutils</groupId>
        <artifactId>commons-beanutils</artifactId>
        <version>1.9.3</version>
        <optional>true</optional><
    /dependency>
    ...