Maven WebappClassLoader和StandardJarScanner之间有什么区别？_Maven_Spring Mvc_Tomcat_Web Applications_Maven Tomcat Plugin

Maven WebappClassLoader和StandardJarScanner之间有什么区别？

maven spring-mvc tomcat web-applications

Maven WebappClassLoader和StandardJarScanner之间有什么区别？,maven,spring-mvc,tomcat,web-applications,maven-tomcat-plugin,Maven,Spring Mvc,Tomcat,Web Applications,Maven Tomcat Plugin,在预集成测试期间，我使用从Maven启动web应用程序，以便在集成测试阶段在本地对其运行测试我对web应用程序本身没有做太多的工作，但作为记录，它使用JSP和Java控制器，这些控制器使用SpringMVC3.0绑定在一起当我在自己的机器上运行Maven mvn clean verify时，我看到插件的以下输出： [INFO] --- tomcat7-maven-plugin:2.2:run-war-only (start-tomcat) @ MyProject --- [INFO] Run

在预集成测试期间，我使用从Maven启动web应用程序，以便在集成测试阶段在本地对其运行测试

我对web应用程序本身没有做太多的工作，但作为记录，它使用JSP和Java控制器，这些控制器使用SpringMVC3.0绑定在一起

当我在自己的机器上运行Maven mvn clean verify时，我看到插件的以下输出：

[INFO] --- tomcat7-maven-plugin:2.2:run-war-only (start-tomcat) @ MyProject ---
[INFO] Running war on http://localhost:8080/contentmain
[INFO] Using existing Tomcat server configuration at /Users/alexjohnson/MyWorkspace/MyProject/src/test/resources/com/MyCompany/MyProject/ui/automation/tomcat7
Jan 27, 2015 2:18:54 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /Users/alexjohnson/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
Jan 27, 2015 2:18:54 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Jan 27, 2015 2:18:54 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Jan 27, 2015 2:18:54 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8443"]
Jan 27, 2015 2:18:54 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 425 ms
Jan 27, 2015 2:18:54 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Jan 27, 2015 2:18:54 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.53
Jan 27, 2015 2:18:55 PM org.apache.catalina.loader.WebappClassLoader validateJarFile
// More startup stuff

[INFO] --- tomcat7-maven-plugin:2.2:run-war-only (start-tomcat) @ MyProject ---
[INFO] Running war on http://localhost:8080/contentmain
[INFO] Using existing Tomcat server configuration at /opt/jenkins/workspace/BuildServerWorkspace/src/test/resources/com/MyCompany/MyProject/ui/automation/tomcat7
Jan 27, 2015 2:30:09 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
Jan 27, 2015 2:30:09 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Jan 27, 2015 2:30:09 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Jan 27, 2015 2:30:09 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8443"]
Jan 27, 2015 2:30:09 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 823 ms
Jan 27, 2015 2:30:09 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Jan 27, 2015 2:30:09 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.53
Jan 27, 2015 2:30:10 PM org.apache.tomcat.util.scan.StandardJarScanner scan
WARNING: Failed to scan JAR [file:/opt/jenkins/BuildServerWorkspace/src/test/resources/com/MyCompany/MyProject/ui/automation/tomcat7/webapps/../../../../../../../../../../../target/MyProject/WEB-INF/lib/openws-1.5.1.jar] from WEB-INF/lib
java.io.FileNotFoundException: /opt/jenkins/BuildServerWorkspace/src/test/resources/com/MyCompany/MyProject/ui/automation/tomcat7/webapps/../../../../../../../../../../../target/MyProject/WEB-INF/lib/openws-1.5.1.jar (No such file or directory)
// Hundreds more FileNotFoundExceptions for JAR files.

这是预期的工作。请注意，WebappClassLoader.validateJarFile被调用。还要注意，APR info消息是预期的，因为我们没有在测试环境中使用这些库

当我在构建服务器mvn clean verify上运行Maven时，我看到插件的以下输出：

[INFO] --- tomcat7-maven-plugin:2.2:run-war-only (start-tomcat) @ MyProject ---
[INFO] Running war on http://localhost:8080/contentmain
[INFO] Using existing Tomcat server configuration at /Users/alexjohnson/MyWorkspace/MyProject/src/test/resources/com/MyCompany/MyProject/ui/automation/tomcat7
Jan 27, 2015 2:18:54 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /Users/alexjohnson/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
Jan 27, 2015 2:18:54 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Jan 27, 2015 2:18:54 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Jan 27, 2015 2:18:54 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8443"]
Jan 27, 2015 2:18:54 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 425 ms
Jan 27, 2015 2:18:54 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Jan 27, 2015 2:18:54 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.53
Jan 27, 2015 2:18:55 PM org.apache.catalina.loader.WebappClassLoader validateJarFile
// More startup stuff

[INFO] --- tomcat7-maven-plugin:2.2:run-war-only (start-tomcat) @ MyProject ---
[INFO] Running war on http://localhost:8080/contentmain
[INFO] Using existing Tomcat server configuration at /opt/jenkins/workspace/BuildServerWorkspace/src/test/resources/com/MyCompany/MyProject/ui/automation/tomcat7
Jan 27, 2015 2:30:09 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
Jan 27, 2015 2:30:09 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Jan 27, 2015 2:30:09 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Jan 27, 2015 2:30:09 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8443"]
Jan 27, 2015 2:30:09 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 823 ms
Jan 27, 2015 2:30:09 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Jan 27, 2015 2:30:09 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.53
Jan 27, 2015 2:30:10 PM org.apache.tomcat.util.scan.StandardJarScanner scan
WARNING: Failed to scan JAR [file:/opt/jenkins/BuildServerWorkspace/src/test/resources/com/MyCompany/MyProject/ui/automation/tomcat7/webapps/../../../../../../../../../../../target/MyProject/WEB-INF/lib/openws-1.5.1.jar] from WEB-INF/lib
java.io.FileNotFoundException: /opt/jenkins/BuildServerWorkspace/src/test/resources/com/MyCompany/MyProject/ui/automation/tomcat7/webapps/../../../../../../../../../../../target/MyProject/WEB-INF/lib/openws-1.5.1.jar (No such file or directory)
// Hundreds more FileNotFoundExceptions for JAR files.

这是行不通的。请注意，这次调用了StandardJarScanner.scan。还请注意，丢失的JAR文件似乎是在本地计算机上的构建过程中创建的，位于webapps中11个目录和目标目录中5个目录的相同相对路径。我相信所有这些JAR文件都是针对第三方Maven依赖项的

我已经阅读了官方的JavaDocs，但是我找不到关于或的有用描述。我真正能收集到的是，当Tomcat启动时，它们都用于从JAR文件加载类

我想知道的是：

在此上下文中，WebappClassLoader和StandardJarScanner的具体用途是什么？ WebappClassLoader和StandardJarScanner之间的主要区别是什么？在构建服务器上，什么样的配置可能不同，导致它在运行Maven时使用StandardJarScanner而不是WebappClassLoader？我知道的所有环境变量和Maven参数都是相同的？看看这个问题

听起来像是詹金斯的一些奇怪的路径，我不明白为什么..

WebAppClassLoader和StandardJarScanner是苹果和桔子。StandardJarScanner总是在WebAppClassLoader之前运行，但只有在出现问题时才会生成日志语句。这意味着StandardJarScanner日志语句在失败的构建中与传递的构建中的WebAppClassLoader日志语句出现在同一点上

由于我误读了这些日志声明，我最终问错了问题。我原来的问题仍然存在。我在上为它提出了一个新问题。

我想是这样，但今天我看到在没有詹金斯参与的情况下，同事的机器上发生了完全相同的错误：