xwork和xwork-core中的冲突

Question

<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-core</artifactId>
    <version>2.1.8.1</version>
</dependency>

<!-- Struts 2 + Spring plugins -->
<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-spring-plugin</artifactId>
    <version>2.1.8.1</version>
</dependency>

<!-- MySQL database driver -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.9</version>
</dependency>

<!-- Spring framework --> 
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring</artifactId>
    <version>2.5.6</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>2.5.6</version>
</dependency>

<!-- Hibernate core -->
<dependency>
    <groupId>asm</groupId>
    <artifactId>asm-all</artifactId>
    <version>3.3</version>
</dependency>
<dependency>
    <groupId>asm</groupId>
    <artifactId>asm</artifactId>
    <version>3.3</version>
</dependency>
    <dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>3.6.7.Final</version>
</dependency>

<!-- Hibernate core library dependency start -->

<!-- Hibernate core library dependency end -->

<!-- Hibernate query library dependency start -->
<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-convention-plugin</artifactId>
    <version>2.1.8.1</version>
</dependency>
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.15</version>
</dependency>

java.lang.NoSuchMethodError: com.opensymphony.xwork2.util.finder.UrlSet.<init>(Lcom/opensymphony/xwork2/util/finder/ClassLoaderInterface;Ljava/util/Set;)V

<dependency>
    <groupId>org.apache.struts.xwork</groupId>
    <artifactId>xwork-core</artifactId>
    <version>2.3.8</version>
</dependency> 

Caused by: Unable to load configuration. - [unknown location]
    at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:58)

Answer 1

升级Struts2版本时，必须将应用程序所需的库更新到目标版本。Struts2的每个dustro都在lib文件夹中提供了与dustro版本兼容的相应库集。如果您使用maven来解析和获取依赖项，您应该考虑工件struts2-core。

<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-core</artifactId>
    <version>2.3.8</version>
</dependency>

它将为这个工件获取所有必需的依赖项，其他依赖项，如需要单独添加的插件。使用相同的版本目标插件。例如，添加约定插件使用

<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-convention-plugin</artifactId>
    <version>2.3.8</version>
</dependency>

我选择的目标版本号是2.3.8，但它可能与其他特性不兼容，即Hibernate和Spring，这些版本需要通过向依赖项添加相应的工件来单独升级。