Jenkins version is 1.617

The Job Generator job is a parameterized build with 2 variables/parameters. 
WHen I try to build the job (or generate the job), it asks for the standard 
Jenkins Job Generator options like "Process this job only", "Disabled Jobs" 
etc. But it is not asking for the parameter values that I have configured 
in the job, which is wrong, I think.

The stack trace is given below andthis same stack trace happens in both 
options: 1) When I give a default value for the 2 parameters, 2) When I do 
not enter a value for the 2 parameters

 


Stack trace

javax.servlet.ServletException: java.lang.ClassCastException: 
net.sf.json.JSONNull cannot be cast to net.sf.json.JSONObject
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:796)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
        at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
        at 
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
        at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)
        at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:123)
        at 
hudson.plugins.greenballs.GreenBallFilter.doFilter(GreenBallFilter.java:58)
        at 
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:120)
        at 
hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:114)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
        at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
        at 
hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
        at 
hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
        at 
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
        at 
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
        at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
        at 
org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
        at 
hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
        at 
org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
        at 
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
        at 
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
        at org.eclipse.jetty.server.Server.handle(Server.java:370)
        at 
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
        at 
org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)
        at 
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)
        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
        at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
        at 
org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
        at 
org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
        at 
org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
        at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassCastException: net.sf.json.JSONNull cannot be cast to 
net.sf.json.JSONObject
        at 
org.jenkinsci.plugins.jobgenerator.parameters.GeneratorParametersDefinitionProperty._doBuild(GeneratorParametersDefinitionProperty.java:127)
        at 
jenkins.model.ParameterizedJobMixIn.doBuild(ParameterizedJobMixIn.java:169)
        at hudson.model.AbstractProject.doBuild(AbstractProject.java:1757)
        at 
org.jenkinsci.plugins.jobgenerator.JobGenerator.doBuild(JobGenerator.java:89)
        at sun.reflect.GeneratedMethodAccessor454.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298)
        at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)
        at 
org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)
        at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:121)
        at 
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
        ... 65 more


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