内容简介:Java 9 踩坑之启动参数
Java 9 出来一段时间了,也试着在 Java 9 下运行jAlbum,原以为以Java一贯的向下兼容原则,直接运行即可,都不用重新在JDK9编译。运行时报错,类找不到:
完整的失败日志为:
[2018-01-24 22:48:42.104 ERROR] [main web.context.ContextLoader:220] - Context initialization failed org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from ServletContext resource [/WEB-INF/beans.xml]; nested exception is org.springframework.beans.FatalBeanException: Invalid NamespaceHandler class [org.apache.cxf.jaxrs.spring.NamespaceHandler] for namespace [http://cxf.apache.org/jaxrs]: problem with handler class file or dependent class; nested exception is java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:412) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178) at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149) at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:124) at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:93) at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130) at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:467) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:397) at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47) at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:890) at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:532) at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:853) at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:344) at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1501) at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1463) at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:785) at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:261) at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:545) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:131) at org.eclipse.jetty.server.Server.start(Server.java:452) at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:105) at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113) at org.eclipse.jetty.server.Server.doStart(Server.java:419) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) at com.shentar.frontend.FrontMain.main(FrontMain.java:106) Caused by: org.springframework.beans.FatalBeanException: Invalid NamespaceHandler class [org.apache.cxf.jaxrs.spring.NamespaceHandler] for namespace [http://cxf.apache.org/jaxrs]: problem with handler class file or dependent class; nested exception is java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException at org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver.resolve(DefaultNamespaceHandlerResolver.java:139) at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1330) at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1325) at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:135) at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:93) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390) ... 30 more Caused by: java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException at org.apache.cxf.jaxrs.spring.NamespaceHandler.init(NamespaceHandler.java:26) at org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver.resolve(DefaultNamespaceHandlerResolver.java:130) ... 36 more Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBException at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source) at java.base/java.lang.ClassLoader.loadClass(Unknown Source) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:560) at java.base/java.lang.ClassLoader.loadClass(Unknown Source) ... 38 more
简单看了下,jaxb找不到,印象中jaxb是有一个独立的工程,但是jse也集成了。试着额外加载jaxb的mvn库,继续报其他web相关的类WebServiceContext找不到。分析了很久,这个就没有可以替代的。感觉不对劲,Google了半天,找到了这个链接: https://stackoverflow.com/questions/43574426/how-to-resolve-java-lang-noclassdeffounderror-javax-xml-bind-jaxbexception-in-j 。Java 9 模块化把javax相关的包都默认禁止访问了,需要添加额外的启动参数才能访问。
修改start.bat,添加如下蓝色斜体部分内容后问题解决:
@ cd /d %~dp0
java –add-modules java.xml.bind,java.xml.ws,java.xml.ws.annotation -Xms512M -Xmx512M -Xdebug -Xrunjdwp:transport=dt_socket,address=4321,server=y,suspend=n -jar start.jar
pause
要彻底解决这个问题还不是一件简单的事情,因为其它的jdk版本不支持此参数,不能默认都添加。得在启动脚本中识别运行时的jre环境,分析java版本,只有在java9下才添加该参数。更为麻烦的是,还要考虑各个不同的厂商的版本version号的规则不一样。如OpenJDK和Oracle的命名就不完全一样。模块化挺好的,但是破坏兼容性,Java 9 这事儿干得真不明智。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持 码农网
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(美) Adam Drozdek著;周翔 / 机械工业出版社 / 2003-07-01 / 49.50元
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