maven-2 - 使用 maven 和嵌入式码头：ClassCastException

Question

我有一个用 java 编写的 web 应用程序。

我想在嵌入式码头服务器上运行集成测试。

为此，我有一个 Maven 项目（仅用于运行集成测试）。

对于部署，我使用 cargo-maven2-plugin。但是在码头启动时，我收到以下信息：

java.lang.ClassCastException: org.mortbay.jetty.webapp.WebInfConfiguration cannot be cast to org.mortbay.jetty.webapp.Configuration

完整日志：

[beddedLocalContainer] Jetty 6.x Embedded starting...
2010-03-29 16:20:46.615::INFO:  Logging to STDERR via org.mortbay.log.StdErrLog
2010-03-29 16:20:46.715::INFO:  jetty-6.1.1rc1
2010-03-29 16:20:46.980::INFO:  Extract jar:file:/C:/Documents%20and%20Settings/Alpha/Local%20Settings/Temp/cargo/conf/cargocpc.war!/ to C:\DOCUME~1\Alpha\LOCALS~1\Temp\Jetty_0_0_0_0_8080_cargocpc.war__cargocpc__xflgf3\webapp
log4j:WARN No appenders could be found for logger (org.apache.jasper.compiler.JspRuntimeContext).
log4j:WARN Please initialize the log4j system properly.
2010-03-29 16:20:47.897::INFO:  Started SelectChannelConnector @ 0.0.0.0:8080
[beddedLocalContainer] Jetty 6.x Embedded started on port [8080]
[cargo:deployer]
[mbeddedLocalDeployer] Deploying [c:\maven-repo\myapp\2.1-SNAPSHOT\myapp-2.1-SNAPSHOT.war]
2010-03-29 16:20:51.711::WARN:  Failed startup of context org.mortbay.jetty.webapp.WebAppContext@132e910{/myapp,c:\maven-repo\myapp\2.1-SNAPSHOT\myapp-2.1-SNAPSHOT.war}
java.lang.ClassCastException: org.mortbay.jetty.webapp.WebInfConfiguration cannot be cast to org.mortbay.jetty.webapp.Configuration
        at org.mortbay.jetty.webapp.WebAppContext.loadConfigurations(WebAppContext.java:801)
        at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:403)
        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.cargo.container.jetty.Jetty6xEmbeddedLocalContainer.addHandler(Jetty6xEmbeddedLocalContainer.java:294)
        at org.codehaus.cargo.container.jetty.Jetty6xEmbeddedLocalDeployer.deployWebApp(Jetty6xEmbeddedLocalDeployer.java:77)
        at org.codehaus.cargo.container.jetty.internal.AbstractJettyEmbeddedLocalDeployer.deploy(AbstractJettyEmbeddedLocalDeployer.java:95)
        at org.codehaus.cargo.maven2.DeployerDeployMojo.performDeployerActionOnSingleDeployable(DeployerDeployMojo.java:79)
        at org.codehaus.cargo.maven2.AbstractDeployerMojo.performDeployerActionOnAllDeployables(AbstractDeployerMojo.java:104)
        at org.codehaus.cargo.maven2.AbstractDeployerMojo.doExecute(AbstractDeployerMojo.java:47)
        at org.codehaus.cargo.maven2.AbstractCargoMojo.execute(AbstractCargoMojo.java:255)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
        at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)

Maven 货物设置：

<profile>
<id>container-cargo-jetty</id>
<properties>
    <skip.test.phase>true</skip.test.phase>
</properties>
<build>
    <plugins>
        <plugin>
            <groupId>org.codehaus.cargo</groupId>
            <artifactId>cargo-maven2-plugin</artifactId>
            <version>1.0</version>
            <configuration>
                <wait>false</wait>
                <container>
                    <containerId>jetty6x</containerId>
                    <type>embedded</type>
                </container>
                <configuration>
                    <properties>
                        <cargo.servlet.port>8080</cargo.servlet.port>
                        <cargo.logging>medium</cargo.logging>
                    </properties>
                </configuration>
                <deployer>
                    <deployables>
                        <deployable>
                            <groupId>myapp</groupId>
                            <artifactId>myapp</artifactId>
                            <type>war</type>
                            <properties>
                                <context>/myapp</context>
                            </properties>
                        </deployable>
                    </deployables>
                </deployer>
            </configuration>
            <executions>
                <execution>
                    <id>start-container</id>
                    <phase>pre-integration-test</phase>
                    <goals>
                        <goal>start</goal>
                        <goal>deployer-deploy</goal>
                    </goals>
                </execution>
                <execution>
                    <id>stop-container</id>
                    <phase>post-integration-test</phase>
                    <goals>
                        <goal>stop</goal>
                    </goals>
                </execution>
            </executions>
            <dependencies>
                <dependency>
                    <groupId>org.mortbay.jetty</groupId>
                    <artifactId>jetty-embedded</artifactId>
                    <version>6.1.22</version>
                </dependency>
            </dependencies>
        </plugin>
    </plugins>
</build>

谢谢帮助

Answer 1

您可能正在处理 JETTY 中的“类加载器地狱”，它使用 JETTY 实例的父类加载器，该类加载器与用于您的 Web 应用程序的类分开，因此即使它们应该是相同的类，但它们不是。

JETTY 配置中有一些选项可以强制使用相同的类加载器，这可能有助于您的集成测试。

类加载 - JETTY

Jetty 提供配置选项来控制所有这三个选项。org.mortbay.jetty.webapp.WebAppContext.setParentLoaderPriority(boolean) 方法允许使用正常的 java 2 行为，如果可能，所有类都将从系统类路径加载。如果 Web 应用程序使用的库在加载 Web 应用程序和系统类路径中的类时遇到问题，这将非常有用。

我不确定您如何在 Cargo 中访问 JETTY 配置，但在普通的 JETTY maven 插件中，您会执行以下操作：

<plugin>
    <groupId>org.mortbay.jetty</groupId>
    <artifactId>jetty-maven-plugin</artifactId>
    <version>7.0.0.pre5</version>
    <configuration>
        <jettyConfig>${jetty.configs}</jettyConfig>
        <reload>manual</reload>
        <contextPath>/</contextPath>
        <webAppConfig>
            <parentLoaderPriority>true</parentLoaderPriority>

        </webAppConfig>
    </configuration>
</plugin>

Answer 2

不支持指定 Cargo 使用的嵌入式 Jetty 的版本（有一个关于此的旧问题，请参阅CARGO-571）。事实上，如果我们查看日志，我们会看到它使用了 jetty-6.1.1rc1：

2010-03-29 16:20:46.715::INFO:  jetty-6.1.1rc1

因此，首先，删除插件配置中的 jetty 依赖项，这实际上是ClassCastException.

但是一旦删除了依赖项，我就遇到了另一个晦涩的公共日志记录问题：

Caused by: org.apache.commons.logging.LogConfigurationException: Invalid class loader hierarchy.  You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.

原因似乎是这部分：

            <execution>
                <id>start-container</id>
                <phase>pre-integration-test</phase>
                <goals>
                    <goal>start</goal>
                    <goal>deployer-deploy</goal>
                </goals>
            </execution>

老实说，我不知道你为什么把deploy-deploy目标称为这里。没有它，Cargo 会部署声明的deployable. 因此，IMO 无需指定此目标。如果你删除它，也不例外（第二个“修复”）。

总而言之，以下配置有效：

<profile>
  <id>container-cargo-jetty</id>
  <properties>
    <skip.test.phase>true</skip.test.phase>
  </properties>
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.cargo</groupId>
        <artifactId>cargo-maven2-plugin</artifactId>
        <version>1.0</version>
        <configuration>
          <wait>false</wait>
          <container>
            <containerId>jetty6x</containerId>
            <type>embedded</type>
          </container>
          <configuration>
           <properties>
             <cargo.servlet.port>8080</cargo.servlet.port>
             <cargo.logging>medium</cargo.logging>
            </properties>
          </configuration>
          <deployer>
            <deployables>
              <deployable>
                <groupId>myapp</groupId>
                <artifactId>myapp</artifactId>
                <type>war</type>
                <properties>
                  <context>/myapp</context>
                </properties>
              </deployable>
            </deployables>
          </deployer>
        </configuration>
        <executions>
          <execution>
            <id>start-container</id>
            <phase>pre-integration-test</phase>
            <goals>
              <goal>start</goal>
            </goals>
          </execution>
          <execution>
            <id>stop-container</id>
            <phase>post-integration-test</phase>
            <goals>
              <goal>stop</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>