启动Jetty server时扫描条目“module info.class”时出错

Question

我最近在启动java服务器时看到了这一点。还有谁见过这个吗？如果是这样，解决办法是什么？我可以确认jar和模块信息。类存在于相关路径中。

 MultiException[java.lang.RuntimeException: Error scanning entry module-info.class from jar
 file:jetty/9.2.4.v20141103/tempDirectory/webapp/WEB-INF/lib/slf4j-api-1.8.0-alpha2.jar, java.lang.RuntimeException: Error scanning entry module-info.class from jar
 file:jetty/9.2.4.v20141103/tempDirectory/webapp/WEB-INF/lib/log4j-over-slf4j-1.8.0-alpha2.jar, java.lang.RuntimeException: Error scanning entry module-info.class from jar
 file:jetty/9.2.4.v20141103/tempDirectory/webapp/WEB-INF/lib/jcl-over-slf4j-1.8.0-alpha2.jar] at
 org.eclipse.jetty.annotations.AnnotationConfiguration.scanForAnnotations(AnnotationConfiguration.java:535) at
 org.eclipse.jetty.annotations.AnnotationConfiguration.configure(AnnotationConfiguration.java:446) at
 org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:473) at
 org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1331) at
 org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741) at
 org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499) at
 org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) at
 org.eclipse.jetty.deploy.bindings.StandardStarter.processBinding(StandardStarter.java:41) at
 org.eclipse.jetty.deploy.AppLifeCycle.runBindings(AppLifeCycle.java:186) at
 org.eclipse.jetty.deploy.DeploymentManager.requestAppGoal(DeploymentManager.java:498) at
 org.eclipse.jetty.deploy.DeploymentManager.addApp(DeploymentManager.java:146) at
 org.eclipse.jetty.deploy.providers.ScanningAppProvider.fileAdded(ScanningAppProvider.java:180) at
 org.eclipse.jetty.deploy.providers.ScanningAppProvider$1.fileAdded(ScanningAppProvider.java:64) at 
 org.eclipse.jetty.util.Scanner.reportAddition(Scanner.java:609) at 
 org.eclipse.jetty.util.Scanner.reportDifferences(Scanner.java:528) at
 org.eclipse.jetty.util.Scanner.scan(Scanner.java:391) at
 org.eclipse.jetty.util.Scanner.doStart(Scanner.java:313) at
 org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) at
 org.eclipse.jetty.deploy.providers.ScanningAppProvider.doStart(ScanningAppProvider.java:150) at
 org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) at
 org.eclipse.jetty.deploy.DeploymentManager.startAppProvider(DeploymentManager.java:560) at
 org.eclipse.jetty.deploy.DeploymentManager.doStart(DeploymentManager.java:235) at
 org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) at
 org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132) at 
 org.eclipse.jetty.server.Server.start(Server.java:387) at
 org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114) at
 org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61) at 
 org.eclipse.jetty.server.Server.doStart(Server.java:354) at
 org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) at
 org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1255) at 
 java.security.AccessController.doPrivileged(Native Method)     at
 org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1174) at 
 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at
 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at
 java.lang.reflect.Method.invoke(Method.java:483) at
 org.eclipse.jetty.start.Main.invokeMain(Main.java:323) at
 org.eclipse.jetty.start.Main.start(Main.java:820) at
 org.eclipse.jetty.start.Main.main(Main.java:112)

Answer 1

模块信息。类是Java9（JPMS）的一个特性。

Jetty 9.4.9（或更新版本）支持Java 9中的新JAR文件更改。

无论您使用的是什么运行时JVM（Oracle Java 8，甚至类似OpenJDK 11.0.3），如果您在WebApp（或服务器类加载器）中使用这些JEP-238多版本Jar文件，则需要将Jetty版本升级到Jetty 9.4。十、

这是因为Servlet 3需要字节码扫描。x介绍。Jetty需要扫描所有JAR文件，以查找与您的webapp定义的@handleTypes匹配的可能servlet注释或引用。一旦JEP-238成为现实，这个字节码扫描层就必须进行调整/更新/修复，以支持这些新的JAR文件结构。Jetty 9.4.9是Jetty的第一个版本，它在字节码扫描期间支持这些新的JAR文件结构。

有关Java 9功能的问题：

• https://github.com/eclipse/jetty.project/issues/1692-不包括模块信息。从字节码扫描中初始化
• https://github.com/eclipse/jetty.project/issues/1797-正确支持META-INF/versions/*多版本JAR文件（JEP 238）