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POGrails NPE on all requests to controller until recompile without change to code
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copied!<p>I'm using Grails 2.0.0. I've started using the webflow plug-in a couple days ago and today ran into some trouble. When I run the application and hit the controller that uses webflow, I get a NullPointerException. If I reload, I get the same. If I add a space to the controller source file (or any change at all, just need to force a recompile) and save with run-app still going, Grails recompiles the controller and subsequent requests work without error. Unfortunately I don't know when the error first came up. I haven't been able to trace the error back to a particular change I made. </p> <p>How can I dig deeper on this? Why would re-compiling a controller at run time fix an NPE? </p> <p>Here's the controller code that I can use to reproduce the issue:</p> <pre><code>class ServicesController { def index() { redirect(action: "request") } def requestFlow = { selectAssessments { on("next") { }.to("productInfo") on("cancel").to("finish") } } } </code></pre> <p>And here's the console log: </p> <pre><code>| Error 2012-03-18 21:43:11,272 ["http-bio-8080"-exec-4] ERROR errors.GrailsExceptionResolver - NullPointerException occurred when processing request: [GET] /project/services/request Stacktrace follows: Message: null Line | Method ->> 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | 908 | run in '' ^ 680 | run . . in java.lang.Thread | Error 2012-03-18 21:43:13,261 ["http-bio-8080"-exec-4] ERROR servlet.GrailsDispatcherServlet - HandlerInterceptor.afterCompletion threw exception Message: No value for key [org.hibernate.impl.SessionFactoryImpl@57c40e95] bound to thread ["http-bio-8080"-exec-4] Line | Method ->> 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | 908 | run in '' ^ 680 | run . . in java.lang.Thread | Error 2012-03-18 21:43:14,199 ["http-bio-8080"-exec-5] ERROR errors.GrailsExceptionResolver - NullPointerException occurred when processing request: [GET] /project/services/request - parameters: execution: e1s1 Stacktrace follows: Message: null Line | Method ->> 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | 908 | run in '' ^ 680 | run . . in java.lang.Thread | Error 2012-03-18 21:43:14,262 ["http-bio-8080"-exec-5] ERROR servlet.GrailsDispatcherServlet - HandlerInterceptor.afterCompletion threw exception Message: No value for key [org.hibernate.impl.SessionFactoryImpl@57c40e95] bound to thread ["http-bio-8080"-exec-5] Line | Method ->> 886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | 908 | run in '' ^ 680 | run . . in java.lang.Thread </code></pre> <p>From target/stacktrace.log:</p> <pre><code>2012-03-23 22:00:33,470 ["http-bio-8080"-exec-3] ERROR StackTrace - Full Stack Trace: java.lang.NullPointerException at org.codehaus.groovy.grails.orm.hibernate.support.GrailsOpenSessionInViewInterceptor.postHandle(GrailsOpenSessionInViewInterceptor.java:75) at org.springframework.web.servlet.handler.WebRequestHandlerInterceptorAdapter.postHandle(WebRequestHandlerInterceptorAdapter.java:61) at org.codehaus.groovy.grails.web.servlet.GrailsDispatcherServlet.doDispatch(GrailsDispatcherServlet.java:342) ... 2012-03-23 22:00:33,490 ["http-bio-8080"-exec-3] ERROR StackTrace - Full Stack Trace: java.lang.NullPointerException at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:680) ... 2012-03-23 22:00:36,725 ["http-bio-8080"-exec-3] ERROR StackTrace - Full Stack Trace: java.lang.IllegalStateException: No value for key [org.hibernate.impl.SessionFactoryImpl@12653c7e] bound to thread ["http-bio-8080"-exec-3] at org.springframework.transaction.support.TransactionSynchronizationManager.unbindResource(TransactionSynchronizationManager.java:209) at org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor.afterCompletion(OpenSessionInViewInterceptor.java:211) </code></pre>

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