# webclient start problem

**URL:** <https://forum.servoy.com/t/webclient-start-problem/9248>\
**Category:** Classic Servoy\
**Created:** [July 1, 2008, 11:16am UTC](https://forum.servoy.com/t/webclient-start-problem/9248 "2008-07-01T11:16:04Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![d4ny](https://avatars.discourse-cdn.com/v4/letter/d/8491ac/32.png) [@d4ny](https://forum.servoy.com/u/d4ny)\
**Post date:** [July 1, 2008, 11:16am UTC](https://forum.servoy.com/t/webclient-start-problem/9248/1 "2008-07-01T11:16:04Z")

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When i click on a solution name in a browser for start webclient, nothing happens.

On server log appear :  
java.lang.NullPointerException  
at com.servoy.j2db.server.headlessclient.b.a(Unknown Source)  
at com.servoy.j2db.server.headlessclient.SolutionLoader.(Unknown Source)  
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)  
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)  
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)  
at java.lang.reflect.Constructor.newInstance(Unknown Source)  
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:147)  
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:88)  
at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.newPage(BookmarkablePageRequestTarget.java:268)  
at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.getPage(BookmarkablePageRequestTarget.java:283)  
at org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.processEvents(BookmarkablePageRequestTarget.java:210)  
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:91)  
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1169)  
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1246)  
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1347)  
at org.apache.wicket.RequestCycle.request(RequestCycle.java:496)  
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:375)  
at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:124)  
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)  
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)  
at sun.reflect.GeneratedMethodAccessor213.invoke(Unknown Source)  
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)  
at java.lang.reflect.Method.invoke(Unknown Source)  
at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)  
at java.security.AccessController.doPrivileged(Native Method)  
at javax.security.auth.Subject.doAsPrivileged(Unknown Source)  
at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)  
at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)  
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:283)  
at org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:56)  
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:189)  
at java.security.AccessController.doPrivileged(Native Method)  
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)  
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)  
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)  
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)  
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)  
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)  
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)  
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)  
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)  
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)  
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)  
at java.lang.Thread.run(Unknown Source)

and in client section :  
Client: 0:0:0:0:0:0:0:1[0:0:0:0:0:0:0:1] (Servoy Web Client)

p.s. On the computer of my colleague who has winxp, it works.

I use Servoy 3.5.6 on MS Vista  
any idea ??

Tnx!

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**Author:** ![jcompagner](https://yyz2.discourse-cdn.com/flex010/user_avatar/forum.servoy.com/jcompagner/32/4889_2.png) [@jcompagner](https://forum.servoy.com/u/jcompagner)\
**Post date:** [July 2, 2008, 3:40pm UTC](https://forum.servoy.com/t/webclient-start-problem/9248/2 "2008-07-02T15:40:51Z")

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difficult to see. Do you have this will all solutions? Do you have to use authentication?

So you on vista have this problem and a co worker can always just open any solution?

Dont you have any other errors in the log?

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**Author:** ![d4ny](https://avatars.discourse-cdn.com/v4/letter/d/8491ac/32.png) [@d4ny](https://forum.servoy.com/u/d4ny)\
**Post date:** [July 2, 2008, 4:05pm UTC](https://forum.servoy.com/t/webclient-start-problem/9248/3 "2008-07-02T16:05:08Z")

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The problem is into my login form…

thanks anyway!!

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**Author:** ![jcompagner](https://yyz2.discourse-cdn.com/flex010/user_avatar/forum.servoy.com/jcompagner/32/4889_2.png) [@jcompagner](https://forum.servoy.com/u/jcompagner)\
**Post date:** [July 3, 2008, 7:27am UTC](https://forum.servoy.com/t/webclient-start-problem/9248/4 "2008-07-03T07:27:10Z")

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but only on your vista machine, other persons dont have any problems?

if you use different browsers on your vista does that help?