at first glance, "UnsupportedClassVersionError: Bad version number in .class file "
Maybe there was something wrong with your higher complier but runs in lower jvm On 9月11日, 上午7时16分, Deepak Singh <[email protected]> wrote: > Any solution pls. > I am stuck with the error. > > On Wed, Sep 8, 2010 at 11:46 PM, Deepak Singh <[email protected]>wrote: > > > > > Hi Mark, > > > yes i refreshed the page but no luck. Also googling could not find an aswer > > needed. > > > Later i changed from jdk 1.6 to jdk 1.5 then i got a different error as > > follows : > > > SEVERE: Context initialization failed > > org.springframework.beans.factory.CannotLoadBeanClassException: Error > > loading class [org.gwtrpcspring.example.server.GreetingServiceImpl] for bean > > with name 'greetService' defined in ServletContext resource > > [/WEB-INF/applicationContext.xml]: problem with class file or dependent > > class; nested exception is java.lang.UnsupportedClassVersionError: Bad > > version number in .class file > > at > > org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanCl > > ass(AbstractBeanFactory.java:1144) > > at > > org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactor > > y.predictBeanType(AbstractAutowireCapableBeanFactory.java:524) > > at > > org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean > > (AbstractBeanFactory.java:1177) > > at > > org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean > > (AbstractBeanFactory.java:758) > > at > > org.springframework.beans.factory.support.DefaultListableBeanFactory.preIns > > tantiateSingletons(DefaultListableBeanFactory.java:422) > > at > > org.springframework.context.support.AbstractApplicationContext.finishBeanFa > > ctoryInitialization(AbstractApplicationContext.java:728) > > at > > org.springframework.context.support.AbstractApplicationContext.refresh(Abst > > ractApplicationContext.java:380) > > at > > org.springframework.web.context.ContextLoader.createWebApplicationContext(C > > ontextLoader.java:255) > > at > > org.springframework.web.context.ContextLoader.initWebApplicationContext(Con > > textLoader.java:199) > > at > > org.springframework.web.context.ContextLoaderListener.contextInitialized(Co > > ntextLoaderListener.java:45) > > at > > org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:5 > > 48) > > at org.mortbay.jetty.servlet.Context.startContext(Context.java:136) > > at > > org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250 > > ) > > at > > org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517) > > at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467) > > at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) > > at > > org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) > > at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) > > at > > org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) > > at org.mortbay.jetty.Server.doStart(Server.java:224) > > at > > org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50) > > at > > com.google.appengine.tools.development.JettyContainerService.startContainer > > (JettyContainerService.java:185) > > at > > com.google.appengine.tools.development.AbstractContainerService.startup(Abs > > tractContainerService.java:146) > > at > > com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerI > > mpl.java:222) > > at > > com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngin > > eLauncher.java:86) > > at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:424) > > at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1059) > > at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:804) > > at com.google.gwt.dev.DevMode.main(DevMode.java:279) > > Caused by: java.lang.UnsupportedClassVersionError: Bad version number in > > .class file > > at java.lang.ClassLoader.defineClass1(Native Method) > > at java.lang.ClassLoader.defineClass(ClassLoader.java:621) > > at > > java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) > > at java.net.URLClassLoader.defineClass(URLClassLoader.java:260) > > at java.net.URLClassLoader.access$100(URLClassLoader.java:56) > > at java.net.URLClassLoader$1.run(URLClassLoader.java:195) > > at java.security.AccessController.doPrivileged(Native Method) > > at java.net.URLClassLoader.findClass(URLClassLoader.java:188) > > at java.lang.ClassLoader.loadClass(ClassLoader.java:307) > > at > > com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(Iso > > latedAppClassLoader.java:151) > > at java.lang.ClassLoader.loadClass(ClassLoader.java:252) > > at org.springframework.util.ClassUtils.forName(ClassUtils.java:211) > > at > > org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBea > > nClass(AbstractBeanDefinition.java:385) > > at > > org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanCl > > ass(AbstractBeanFactory.java:1138) > > ... 28 more > > > On Wed, Sep 8, 2010 at 6:44 PM, markM <[email protected]> wrote: > > >> When you got this error did you hit F5 (assuming you're using I.E.) to > >> refresh the browser? And did that help? Maybe try a project-clean? > >> Also, have you tried googling the error you got to see what it means? > > >> On Sep 8, 5:36 am, Deepak Singh <[email protected]> wrote: > >> > I also downloaded SimpleGwtRpcSpringExample an dimported this into my > >> > eclipse 3.5 with jdk 1.6 but i could not run it. > >> > I got the exception > > >> > com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException: This > >> > application is out of date, please click the refresh button on your > >> browser. > >> > ( Expecting version 5 from client, got 6. > >> > I also tried to configure them seperately into my project but got the > >> same > >> > error. > > >> > Any one who has done this gwt-spring integration, can u pls help on > >> that. > > >> > My need is to call web services method from spring and the get the > >> result > >> > back to client code. > >> > Any other solution to integrate them if anyone is using.On Fri, Sep 3, > >> 2010 at 7:30 PM, markM <[email protected]> wrote: > >> > > Sam/George, > > >> > > Just started looking into this same thing about a month ago. My > >> > > experience was as follows. I found that the Spring documentation > >> > > references the GWT Server Library so it must be the official pathway > >> > > correct? I tried to use the inheritance methodology, one of three the > >> > > GWT Server Library supports, and got it working temporarily under > >> > > Jetty/GWT Eclipse plugin. For some reason it stopped working. Then I > >> > > read further in the GWT Server Library documentation and found that > >> > > the authors tell you simply not to use the GWT plugin's built in web- > >> > > server (Jetty). In other words you have to work with the -noserver > >> > > option in GWT in order to debug server side code because Jetty doesn't > >> > > support J2EE features that Spring uses that for instance Tomcat or > >> > > other web servers support. I had used -noserver previously and so > >> > > thought this not to be a big deal. However, with a fair amount of > >> > > effort I never got the project to run even in -noserver mode. My > >> > > experience with the GWT Server Library documentation and I believe > >> > > they even stated this in the documentation was that you're expected to > >> > > already understand Spring and this made it more difficult for me to > >> > > implmenet. Moving to -noserver mode also required me to muck with > >> > > eclipse setting files in order to make my GWT eclipse project also a > >> > > Web-Eclipse project. Probably with more time I would have been able > >> > > to figure it out but it wasn't clean having to muck with eclipse files > >> > > anyway and I was looking for the simplest methodology as I'm trying to > >> > > get folks within my company to understand the beauty of GWT and > >> > > roadblocks like this don't help. > > >> > > Yesterday, after reading your post I downloaded the > >> > > SimpleGwtRpcSpringExample.zip file from the URL Sam mentioned > > >> > >http://code.google.com/p/gwtrpc-spring/ > > >> > > The self-containing Eclipse project worked out of the box! under > >> > > Jetty! I did have to move to JDK 1.6 and recompile to get rid of a > >> > > class versioning error. I notice that the bright folks who wrote this > >> > > component created their own dispatcher class so as to not have to use > >> > > Spring's dispatcher class. I'm assuming that this is the reason that > >> > > it worked under Jetty because their custom dispatcher doesn't rely on > >> > > the extra J2EE facilities that Spring's dispatcher does. There may be > >> > > downsides to this component but I haven't seen any yet. One thing I > >> > > read about the GWT Server Library is that if you use their inheritance > >> > > scheme to spring enable your server side rpc class it's faster because > >> > > it doesn't use reflection. However, if all you're doing is making > >> > > calls into the server based upon button clicks the vast majority of > >> > > your processing is going to likely go in in the server and so the > >> > > performance thing may be of little consequence. I don't see a pause > >> > > in the example greet server app when I click the button. If anyone > >> > > has used the gwtrpc-spring component extensively and knows more about > >> > > the downsides, if any, I'd love to hear about it. > > >> > > On Sep 3, 3:12 am, Alek <[email protected]> wrote: > >> > > > Hi, > > >> > > > We also use SL for our project. I configured this solution once and > >> > > > forgot about it. > > >> > > > Respect > > >> > > > On Aug 31, 11:24 pm, George Georgovassilis< > >> [email protected]> > >> > > wrote: > >> > > > > Hi Sam, > > >> > > > > The SL [1] is a community maintained integration of Spring and GWT > >> > > > > mainly focused at exporting Spring managed beans as RPC services. > >> It > >> > > > > was launched four years ago and has reached through many releases > >> a > >> > > > > high degree of maturity. The documentation is extensive, it's easy > >> to > >> > > > > use (though I'm biased) but it's been criticized for not using > >> maven. > > >> > > > > [1]http://gwt-widget.sourceforge.net/ > > >> > > > > On Aug 31, 5:31 pm, Sam <[email protected]> wrote: > > >> > > > > > Note: this thread is > > ... > > 阅读更多 >> -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
