如何解决HTTP错误：503服务不可用IntelliJ IDEA GWT
我使用IntelliJ Idea Ultimate创建了一个新的新GWT项目，其中包含示例代码，但我似乎无法运行它，起初我在DTD文件上遇到问题，但我设法解决了这个问题，我想也许这就是问题的原因，但它仍然存在。我没有看到Web xml文件有什么问题
默认情况下就是这样
XML web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>com.studybuddy.studybuddy studybuddyService</servlet-name>
<servlet-class>com.studybuddy.server.studybuddyServiceImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>com.studybuddy.studybuddy studybuddyService</servlet-name>
<url-pattern>/studybuddy/studybuddyService</url-pattern>
</servlet-mapping>
</web-app>
然后我尝试了此操作，因为似乎它在代码中添加了文件结构中不存在的新程序包，我想也许是问题所在，但不是。
XML web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>com.studybuddy studybuddyService</servlet-name>
<servlet-class>com.studybuddy.server.studybuddyServiceImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>com.studybuddy studybuddyService</servlet-name>
<url-pattern>/studybuddy/studybuddyService</url-pattern>
</servlet-mapping>
</web-app>
它仍然没有起作用，所以我回到了顶部的上一个 这是控制台上给出的错误
"C:\Program Files\Java\jdk1.8.0_221\bin\java.exe" -Xmx512m "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2020.2\lib\idea_rt.jar=59040:C:\Program Files\JetBrains\IntelliJ IDEA 2020.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Users\Username\Programming\Tools\gwt-2.9.0\gwt-codeserver.jar;C:\Users\Username\Programming\Tools\gwt-2.9.0\gwt-dev.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\src;C:\Program Files\Java\jdk1.8.0_221\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\out\production\studybuddy;C:\Users\Username\Programming\Tools\gwt-2.9.0\gwt-user.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\istack-commons-runtime-3.0.7.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\classmate-1.5.1.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\hibernate-commons-annotations-5.1.0.Final.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\antlr-2.7.7.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\FastInfoset-1.2.15.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\dom4j-2.1.1.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\jandex-2.1.1.Final.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\javax.activation-api-1.2.0.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\javax.persistence-api-2.2.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\jaxb-api-2.3.1.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\jboss-logging-3.3.2.Final.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\jaxb-runtime-2.3.1.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\jboss-transaction-api_1.2_spec-1.1.1.Final.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\javassist-3.24.0-GA.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\stax-ex-1.8.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\txw2-2.3.1.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\byte-buddy-1.10.7.jar;C:\Users\Username\Programming\Projects\Software\studybuddy\lib\hibernate-core-5.4.11.Final.jar;C:\Users\Username\Programming\Tools\gwt-2.9.0\validation-api-1.0.0.GA-sources.jar;C:\Users\Username\Programming\Tools\gwt-2.9.0\validation-api-1.0.0.GA.jar" com.google.gwt.dev.DevMode -superDevMode -war "C:\Users\Username\AppData\Local\JetBrains\IntelliJIdea2020.2\gwt\studybuddy.a6fa6789\studybuddy.720fbc3d\run\www" -remoteUI 7901:IntelliJIdea -startupUrl studybuddy.html com.studybuddy.studybuddy
Running CodeServer with parameters: [-noprecompile,-port,9876,-sourceLevel,1.8,-bindAddress,127.0.0.1,-launcherDir,C:\Users\Username\AppData\Local\JetBrains\IntelliJIdea2020.2\gwt\studybuddy.a6fa6789\studybuddy.720fbc3d\run\www,-logLevel,INFO,-style,OBFUSCATED,com.studybuddy.studybuddy]
Super Dev Mode starting up
workDir: C:\Users\MBUSOK~1\AppData\Local\Temp\gwt-codeserver-920221797952530601.tmp
2020-08-12 14:56:27.774:INFO::main: Logging initialized @2962ms
Loading Java files in com.studybuddy.studybuddy.
Module setup completed in 22555 ms
2020-08-12 14:56:49.365:INFO:oejs.Server:main: jetty-9.2.z-SNAPSHOT
2020-08-12 14:56:49.385:INFO:oejsh.ContextHandler:main: Started o.e.j.s.ServletContextHandler@5d4a5149{/,null,AVAILABLE}
The code server is ready at http://127.0.0.1:9876/
Code server started in 23.71 s ms
2020-08-12 14:56:49.416:INFO:oejs.ServerConnector:main: Started ServerConnector@73c674b6{HTTP/1.1}{127.0.0.1:9876}
2020-08-12 14:56:49.421:INFO:oejs.Server:main: Started @24608ms
2020-08-12 14:56:49.619:INFO:oejs.Server:main: jetty-9.2.z-SNAPSHOT
Starting Jetty on port 8888
[WARN]
java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
at org.eclipse.jetty.annotations.ClassInheritanceHandler.addToInheritanceMap(ClassInheritanceHandler.java:72)
at org.eclipse.jetty.annotations.ClassInheritanceHandler.handle(ClassInheritanceHandler.java:58)
at org.eclipse.jetty.annotations.AnnotationParser$MyClassVisitor.visit(AnnotationParser.java:480)
at org.objectweb.asm.ClassReader.accept(ClassReader.java:533)
at org.objectweb.asm.ClassReader.accept(ClassReader.java:400)
at org.eclipse.jetty.annotations.AnnotationParser.scanClass(AnnotationParser.java:974)
at org.eclipse.jetty.annotations.AnnotationParser.parseJarEntry(AnnotationParser.java:956)
at org.eclipse.jetty.annotations.AnnotationParser.parseJar(AnnotationParser.java:909)
at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:831)
at org.eclipse.jetty.annotations.AnnotationConfiguration$ParserTask.call(AnnotationConfiguration.java:163)
at org.eclipse.jetty.annotations.AnnotationConfiguration$1.run(AnnotationConfiguration.java:548)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
at java.lang.Thread.run(Thread.java:748)
[WARN]
java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
at org.eclipse.jetty.annotations.ClassInheritanceHandler.addToInheritanceMap(ClassInheritanceHandler.java:72)
at org.eclipse.jetty.annotations.ClassInheritanceHandler.handle(ClassInheritanceHandler.java:58)
at org.eclipse.jetty.annotations.AnnotationParser$MyClassVisitor.visit(AnnotationParser.java:480)
at org.objectweb.asm.ClassReader.accept(ClassReader.java:533)
at org.objectweb.asm.ClassReader.accept(ClassReader.java:400)
at org.eclipse.jetty.annotations.AnnotationParser.scanClass(AnnotationParser.java:974)
at org.eclipse.jetty.annotations.AnnotationParser.parseJarEntry(AnnotationParser.java:956)
at org.eclipse.jetty.annotations.AnnotationParser.parseJar(AnnotationParser.java:909)
at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:831)
at org.eclipse.jetty.annotations.AnnotationConfiguration$ParserTask.call(AnnotationConfiguration.java:163)
at org.eclipse.jetty.annotations.AnnotationConfiguration$1.run(AnnotationConfiguration.java:548)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
at java.lang.Thread.run(Thread.java:748)
[WARN] Failed startup of context c.g.g.d.s.j.WebAppContextWithReload@5fbcea03{/,file:/C:/Users/Mbuso%20Kotob's/AppData/Local/JetBrains/IntelliJIdea2020.2/gwt/studybuddy.a6fa6789/studybuddy.720fbc3d/run/www/,STARTING}{C:\Users\Username\AppData\Local\JetBrains\IntelliJIdea2020.2\gwt\studybuddy.a6fa6789\studybuddy.720fbc3d\run\www}
MultiException[java.lang.RuntimeException: Error scanning entry module-info.class from jar file:/C:/Users/Mbuso%20Kotob's/AppData/Local/JetBrains/IntelliJIdea2020.2/gwt/studybuddy.a6fa6789/studybuddy.720fbc3d/run/www/WEB-INF/lib/classmate-1.5.1.jar,java.lang.RuntimeException: Error scanning entry META-INF/versions/9/module-info.class from jar file:/C:/Users/Mbuso%20Kotob's/AppData/Local/JetBrains/IntelliJIdea2020.2/gwt/studybuddy.a6fa6789/studybuddy.720fbc3d/run/www/WEB-INF/lib/byte-buddy-1.10.7.jar]
at org.eclipse.jetty.annotations.AnnotationConfiguration.scanForAnnotations(AnnotationConfiguration.java:536)
at org.eclipse.jetty.annotations.AnnotationConfiguration.configure(AnnotationConfiguration.java:447)
at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:479)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1337)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505)
at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:550)
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.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
at org.eclipse.jetty.server.handler.RequestLogHandler.doStart(RequestLogHandler.java:140)
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 com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:760)
at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:636)
at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:898)
at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:705)
at com.google.gwt.dev.DevMode.main(DevMode.java:432)
Suppressed: java.lang.RuntimeException: Error scanning entry META-INF/versions/9/module-info.class from jar file:/C:/Users/Mbuso%20Kotob's/AppData/Local/JetBrains/IntelliJIdea2020.2/gwt/studybuddy.a6fa6789/studybuddy.720fbc3d/run/www/WEB-INF/lib/byte-buddy-1.10.7.jar
at org.eclipse.jetty.annotations.AnnotationParser.parseJar(AnnotationParser.java:913)
at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:831)
at org.eclipse.jetty.annotations.AnnotationConfiguration$ParserTask.call(AnnotationConfiguration.java:163)
at org.eclipse.jetty.annotations.AnnotationConfiguration$1.run(AnnotationConfiguration.java:548)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.UnsupportedOperationException: This feature requires ASM6
at org.objectweb.asm.ClassVisitor.visitModule(ClassVisitor.java:130)
at org.objectweb.asm.ClassReader.readModuleAttributes(ClassReader.java:724)
at org.objectweb.asm.ClassReader.accept(ClassReader.java:544)
at org.objectweb.asm.ClassReader.accept(ClassReader.java:400)
at org.eclipse.jetty.annotations.AnnotationParser.scanClass(AnnotationParser.java:974)
at org.eclipse.jetty.annotations.AnnotationParser.parseJarEntry(AnnotationParser.java:956)
at org.eclipse.jetty.annotations.AnnotationParser.parseJar(AnnotationParser.java:909)
... 6 more
Caused by: java.lang.RuntimeException: Error scanning entry module-info.class from jar file:/C:/Users/Mbuso%20Kotob's/AppData/Local/JetBrains/IntelliJIdea2020.2/gwt/studybuddy.a6fa6789/studybuddy.720fbc3d/run/www/WEB-INF/lib/classmate-1.5.1.jar
at org.eclipse.jetty.annotations.AnnotationParser.parseJar(AnnotationParser.java:913)
at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:831)
at org.eclipse.jetty.annotations.AnnotationConfiguration$ParserTask.call(AnnotationConfiguration.java:163)
at org.eclipse.jetty.annotations.AnnotationConfiguration$1.run(AnnotationConfiguration.java:548)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.UnsupportedOperationException: This feature requires ASM6
at org.objectweb.asm.ClassVisitor.visitModule(ClassVisitor.java:130)
at org.objectweb.asm.ClassReader.readModuleAttributes(ClassReader.java:724)
at org.objectweb.asm.ClassReader.accept(ClassReader.java:544)
at org.objectweb.asm.ClassReader.accept(ClassReader.java:400)
at org.eclipse.jetty.annotations.AnnotationParser.scanClass(AnnotationParser.java:974)
at org.eclipse.jetty.annotations.AnnotationParser.parseJarEntry(AnnotationParser.java:956)
at org.eclipse.jetty.annotations.AnnotationParser.parseJar(AnnotationParser.java:909)
... 6 more
2020-08-12 14:56:52.571:INFO:oejs.ServerConnector:main: Started ServerConnector@374cd3e4{HTTP/1.1}{127.0.0.1:8888}
2020-08-12 14:56:52.571:INFO:oejs.Server:main: Started @27759ms
Dev Mode initialized. Startup URL:
http://127.0.0.1:8888/studybuddy.html
[ERROR] 503 - GET /studybuddy.html (127.0.0.1) 303 bytes
Request headers
Host: 127.0.0.1:8888
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:79.0) Gecko/20100101 Firefox/79.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip,deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Response headers
Date: Wed,12 Aug 2020 12:56:53 GMT
Cache-Control: must-revalidate,no-cache,no-store
Content-Type: text/html; charset=ISO-8859-1
Content-Length: 303
[ERROR] 503 - GET /favicon.ico (127.0.0.1) 299 bytes
Request headers
Host: 127.0.0.1:8888
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:79.0) Gecko/20100101 Firefox/79.0
Accept: image/webp,*/*
Accept-Language: en-US,deflate
Connection: keep-alive
Response headers
Date: Wed,no-store
Content-Type: text/html; charset=ISO-8859-1
Content-Length: 299
还尝试使用不同版本的Jetty，因为我认为这是个问题，尽管它也不起作用，但sam [在此处输入图像说明] [1]错误，不确定我所做的Jetty设置是否正确但是。
还在最新版本的Eclipse中进行了尝试，它还给了我Jetty 503错误
我该如何解决？？
DIR结构的图像 [1]：https://i.stack.imgur.com/Y15BJ.png
解决方法
Intellij插件已过时，jetbrains由于某种原因拒绝开源或更新它，因此开始使用GWT的最佳方法是使用Thomas Broyer maven Archetypes：
您可以使用以下命令生成项目
mvn archetype:generate \
-DarchetypeGroupId=net.ltgt.gwt.archetypes \
-DarchetypeVersion=LATEST \
-DarchetypeArtifactId=modular-webapp
然后从一个终端的根文件夹中执行：
mvn jetty:run -pl *-server -am -Denv=dev以运行服务器
，然后在另一个终端中执行：
mvn gwt:codeserver -pl *-client -am以运行gwt super dev模式-SDM-
然后您可以使用http://localhost:8080
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