Thanks Thomas. As always you pointed me in the right direction. I've got a 
dependency to com.gwtplatform::gwtp-all which depends 
on javax.servlet::servlet-api::2.5. Adding an <exclusion/> fixes this and 
SuperDevMode is running again!


Am Freitag, 29. Juli 2016 18:06:04 UTC+2 schrieb Thomas Broyer:
>
> Check your dependencies, you may have Servlets API pre-3.0 (which 
> introduced this method); either coming before Servlets API 3.1 in the 
> classpath (they don't have the same artifactId so they could both be 
> present), or in place of 3.1 (if javax.servlet:javax.servlet-api is somehow 
> excluded).
>
> On Friday, July 29, 2016 at 5:58:07 PM UTC+2, Harald Pehl wrote:
>>
>> Running SuperDevMode using GWT 2.8.0-rc1 and the GWT Maven Plugin from 
>> Thomas (net.ltgt.gwt.maven:gwt-maven-plugin:1.0-rc-6:devmode) throws an 
>> exception. Not sure whether it's related to RC1 or the maven plugin. 
>>
>> [INFO] The code server is ready at http://127.0.0.1:9876/
>> [WARNING] Exception in thread "main" java.lang.NoSuchMethodError: 
>> javax.servlet.ServletContext.getJspConfigDescriptor()Ljavax/servlet/descriptor/JspConfigDescriptor;
>> [WARNING]   at 
>> org.apache.jasper.servlet.TldScanner.scanJspConfig(TldScanner.java:148)
>> [WARNING]   at 
>> org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:97)
>> [WARNING]   at 
>> org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:103)
>> [WARNING]   at 
>> org.eclipse.jetty.plus.annotation.ContainerInitializer.callStartup(ContainerInitializer.java:140)
>> [WARNING]   at 
>> org.eclipse.jetty.annotations.ServletContainerInitializersStarter.doStart(ServletContainerInitializersStarter.java:65)
>> [WARNING]   at 
>> org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
>> [WARNING]   at 
>> org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:274)
>> [WARNING]   at 
>> org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1349)
>> [WARNING]   at 
>> org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1342)
>> [WARNING]   at 
>> org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741)
>> [WARNING]   at 
>> org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505)
>> [WARNING]   at 
>> com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:552)
>> [WARNING]   at 
>> org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
>> [WARNING]   at 
>> org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
>> [WARNING]   at 
>> org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
>> [WARNING]   at 
>> org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
>> [WARNING]   at 
>> org.eclipse.jetty.server.handler.RequestLogHandler.doStart(RequestLogHandler.java:140)
>> [WARNING]   at 
>> org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
>> [WARNING]   at 
>> org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
>> [WARNING]   at org.eclipse.jetty.server.Server.start(Server.java:387)
>> [WARNING]   at 
>> org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
>> [WARNING]   at 
>> org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61)
>> [WARNING]   at org.eclipse.jetty.server.Server.doStart(Server.java:354)
>> [WARNING]   at 
>> org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
>> [WARNING]   at 
>> com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:761)
>> [WARNING]   at 
>> com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:630)
>> [WARNING]   at 
>> com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:923)
>> [WARNING]   at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:706)
>> [WARNING]   at com.google.gwt.dev.DevMode.main(DevMode.java:426)
>>
>>
>> Am Freitag, 29. Juli 2016 07:40:30 UTC+2 schrieb Daniel Kurka:
>>>
>>> Hi all,
>>>
>>> I just build the GWT 2.8.0 RC1 and pushed it to maven central. The 
>>> complete SDK is also available from here <http://goo.gl/V7cdJv>.
>>>
>>> Please start testing and let us know if you run into any trouble. You 
>>> can either reply to this thread on gwt-contrib 
>>> <https://groups.google.com/forum/#!topic/Google-Web-Toolkit-Contributors/YiOK6Aa8CLI>
>>>  or file bugs <https://github.com/gwtproject/gwt/issues/new>.
>>>
>>> We are planing to release this as GWT 2.8.0 if we do not here about any 
>>> serious issues within the next two weeks. The release notes for RC1 
>>> <https://github.com/gwtproject/gwt-site/blob/master/src/main/markdown/release-notes.md#Release_Notes_2_8_0_RC1>
>>>  
>>> will be made available shortly after this notice, in the mean time you can 
>>> take a look at the github repository 
>>> <https://github.com/gwtproject/gwt-site/blob/master/src/main/markdown/release-notes.md#Release_Notes_2_8_0_RC1>
>>> .
>>>
>>> Daniel,
>>> on behalf of the GWT team
>>>
>>

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