无法处理Java9项目中的文件module-info.class导致ClassFormatException [英] Unable to process file module-info.class within a Java9 project results in ClassFormatException

问题描述

尝试在IntelliJ 2017.2.2的Java 9预发行版下运行Vaadin 8.1应用程序我能够使用

Trying to Run Vaadin 8.1 app under Java 9 prerelease in IntelliJ 2017.2.2 I was able to build a vaadinjavanine.war using a fresh project and host the same using Jetty Server.

我最终试图将生成的war部署到tomcat服务器.但是，在tomcat服务器启动期间，出现以下异常:

I ended up trying to deploy the generated war to a tomcat server. But, during the startup of the tomcat server, I am getting the following exception:

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)

该异常指出无法处理由Java9的module-info.java生成的module-info.class. 是否可以解决此问题?还是这实际上意味着tomcat尚未准备好使用Java9模块?

The exception states unable to process the module-info.class, which is generated from Java9's module-info.java. Is there a way to resolve this? Or does this actually means tomcat is not ready for java9 modules yet?

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.

Note: Being novice to Tomcat, I have not customised any of the settings. Let me know, if something else can be shared for further information.

推荐答案

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:

I'm not a Tomcat expert, but it looks like the module descriptor is not the most severe problem. The nexted exception contains this block:

由以下原因引起:java.lang.UnsupportedClassVersionError:nullpointer/MyUI$MyUIServlet已由Java Runtime的较新版本(类文件版本53.0)进行编译，此版本的Java Runtime仅识别52.0以下的类文件版本(无法加载)类nullpointer.MyUI$MyUIServlet)

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)

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.

This makes it look like you're running Tomcat on Java 8 (class file version 52), whereas your code is compiled with Java 9 (class file version 53).

确保在Java 9上运行Tomcat.此外，您可能需要尝试 Tomcat 9的早期访问版本，这是Java 9兼容性所必需的.

Make sure to run Tomcat on Java 9. Furthermore you might want to try an early access build of Tomcat 9, which is required for Java 9 compatibility.

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