尝试在IntelliJ 2017.2.2中的Java9预发行版下运行Vaadin8.1应用程序,我能够vaadinjavanine.war使用一个新项目构建一个,并使用Jetty Server托管该项目。
vaadinjavanine.war
我最终试图将产生的战争部署到tomcat服务器。但是,在tomcat服务器启动期间,出现以下异常:
21-Aug-2017 22:53:38.830 SEVERE [localhost-startStop-1] org.apache.catalina.startup.ContextConfig.processAnnotationsFile Unable to process file [/Library/Tomcat/apache-tomcat-8.0.22/webapps/vaadinjavanine/WEB-INF/classes/module-info.class] for annotations org.apache.tomcat.util.bcel.classfile.ClassFormatException: Invalid byte tag in constant pool: 19 at org.apache.tomcat.util.bcel.classfile.Constant.readConstant(Constant.java:97) at org.apache.tomcat.util.bcel.classfile.ConstantPool.<init>(ConstantPool.java:55) at org.apache.tomcat.util.bcel.classfile.ClassParser.readConstantPool(ClassParser.java:177) at org.apache.tomcat.util.bcel.classfile.ClassParser.parse(ClassParser.java:85) at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2011) at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:1994) at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:1988) at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1939) at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1897) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1149) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:771) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:305) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5066) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:945) at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1768) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) 21-Aug-2017 22:53:38.980 SEVERE [localhost-startStop-1] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/vaadinjavanine]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:945) at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1768) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.UnsupportedClassVersionError: nullpointer/MyUI$MyUIServlet has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0 (unable to load class nullpointer.MyUI$MyUIServlet) at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2476) at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:854) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1274) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1157) at org.atmosphere.util.IOUtils.isAtmosphere(IOUtils.java:381) at org.atmosphere.cpr.ContainerInitializer.onStartup(ContainerInitializer.java:58) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5156) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 10 more 21-Aug-2017 22:53:38.981 SEVERE [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployWAR Error deploying web application archive /Library/Tomcat/apache-tomcat-8.0.22/webapps/vaadinjavanine.war java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/vaadinjavanine]] at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:728) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:945) at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1768) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)
异常指出无法处理module-info.class从Java9生成的module-info.java。 有办法解决吗? 还是这实际上意味着tomcat尚未准备好使用Java9模块?
module-info.class
module-info.java
注意 :作为Tomcat的新手,我尚未自定义任何设置。让我知道,是否可以共享其他信息以获取更多信息。
我不是Tomcat专家,但是看起来模块描述符并不是最严重的问题。接下来的异常包含以下块:
产生的原因:java.lang.UnsupportedClassVersionError:nullpointer/MyUI$MyUIServlet已经有最新版本的Java运行时(类文件版本53.0)的编制,这个版本的Java运行时只能识别类文件版本到52.0(无法加载类nullpointer.MyUI$MyUIServlet)
java.lang.UnsupportedClassVersionError
nullpointer/MyUI$MyUIServlet
nullpointer.MyUI$MyUIServlet
这看起来就像您在Java 8(类文件版本52)上运行Tomcat,而您的代码是使用Java 9(类文件版本53)进行编译的。
确保在Java 9上运行Tomcat。此外,您可能想尝试Tomcat9的早期访问版本,这是Java9兼容性所必需的。