Hi,
I have a Maven multi-module project that uses Spring Framework in the
backend. Everything was working fine until I tried to migrate from GWT
2.7.0 to 2.8.1. Supposedly production mode works fine (never tried though
so far), but in SuperDev mode I am getting initialization errors coming
from Spring bootstrap. Some built-in Spring beans require them to be
created only once, while attempts to create several of them are taken (see
the log file attached for an example). Digging into this, I discovered that
it has something to do with the fix for
https://github.com/gwtproject/gwt/issues/9292, namely, in
com.google.gwt.dev.shell.jetty.JettyLauncher.WebAppContextWithReload.WebAppClassLoaderExtension#getResources
<https://github.com/gwtproject/gwt/blob/master/dev/core/src/com/google/gwt/dev/shell/jetty/JettyLauncher.java#L373>
method. Before this fix, Jetty's classloader loaded resources strictly from
the lib folder of the web application, and now it is so greedy that it
loads them both from this said folder AND local Maven repo. This makes all
my Maven submodules available twice in the classpath, each if them is
treated individually.
To demonstrate the issue, I've created a simple application that resembles
my original setup. This application is available here:
https://github.com/AndrewAni/GwtDev. If these
<https://github.com/AndrewAni/GwtDev/blob/master/server/src/main/resources/applicationContext.xml#L5>
two scheduler-related bean definitions are commented out, the problem
doesn't present itself.
It appears that if I go with Java-based Spring configuration, this wouldn't
bother me anymore, since the suspicious classloader code affects only
loading resources like XMLs. But I cannot shake the feeling that I am doing
something wrong, and with the next GWT development iteration even Java
classes would be loaded differently, breaking my stuff even more.
Am I missing something? Is my setup wrong somehow? Something about Maven
layout maybe?
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00:00:00.006 [WARN] Failed startup of context
c.g.g.d.s.j.WebAppContextWithReload@65a746f7{/,file:/C:/Stuff/GwtDev/client/target/client-1.0.0/,STARTING}{C:\Stuff\GwtDev\client\target\client-1.0.0}
org.springframework.beans.factory.parsing.BeanDefinitionParsingException:
Configuration problem: Only one AsyncAnnotationBeanPostProcessor may exist
within the context. Offending resource: URL
[jar:file:/C:/Stuff/GwtDev/server/target/server-1.0.0.jar!/applicationContext.xml]
at
org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:70)
at
org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
at
org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:72)
at
org.springframework.scheduling.config.AnnotationDrivenBeanDefinitionParser.parse(AnnotationDrivenBeanDefinitionParser.java:67)
at
org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:74)
at
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1411)
at
org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1401)
at
org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:172)
at
org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:142)
at
org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:94)
at
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:508)
at
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:392)
at
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)
at
org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)
at
org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:181)
at
org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:217)
at
org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188)
at
org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:125)
at
org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94)
at
org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)
at
org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:614)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:515)
at
org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:443)
at
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:325)
at
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
at
org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:800)
at
org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:444)
at
org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:791)
at
org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:294)
at
org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1349)
at
org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1342)
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:923)
at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:706)
at com.google.gwt.dev.DevMode.main(DevMode.java:432)
