The solver configuration does not exist error in grails optaplanner

Question

I am trying to run the cloud balancing example as in optaplanner site here. I have placed the cloudBalancingSolverConfig.xml file in web-app/xmls directory. Here is my code of the save action of CloudBalanceDomainController:

def save() {
        def serveletContext = ServletContextHolder.servletContext
        def storagePath = serveletContext.getRealPath( "/" )

        String temp=storagePath+"xmls"+File.separator+"cloudBalancingSolverConfig.xml"
        File f=new File(temp)
        if(f.exists())
            println "file exists!"
        SolverFactory solverFactory=new XmlSolverFactory(temp)
        Solver solver=solverFactory.buildSolver()
        CloudBalance unsolvedCloudBalance=new CloudBalancingGenerator().createCloudBalance(params.computers,params.processes)
        solver.setPlanningProblem(unsolvedCloudBalance);
        solver.solve()
        CloudBalance solvedCloudBalance = (CloudBalance) solver.getBestSolution()
           render(view: "create", model: [cloudBalanceDomainInstance: cloudBalanceDomainInstance])
        flash.message = message(code: 'default.created.message', args: [message(code: 'cloudBalanceDomain.label', default: 'CloudBalanceDomain'), cloudBalanceDomainInstance.id])
        render "${getToDisplayString(solvedCloudBalance)}"
        //redirect(action: "show", showStr: getToDisplayString(solvedCloudBalance))
    }

On running, it returns following exception:

Executing action [save] of controller [optaplannergrails.CloudBalanceDomainController]  caused exception: Runtime error executing action
    at org.codehaus.groovy.grails.web.servlet.mvc.AbstractGrailsControllerHelper.executeAction(AbstractGrailsControllerHelper.java:222) ~[grails-web-2.2.1.jar:2.2.1]
    at grails.plugin.cache.web.ProxyAwareMixedGrailsControllerHelper.executeAction(ProxyAwareMixedGrailsControllerHelper.java) ~[plugin-classes/:na]
    at org.codehaus.groovy.grails.web.servlet.mvc.AbstractGrailsControllerHelper.handleURI(AbstractGrailsControllerHelper.java:183) ~[grails-web-2.2.1.jar:2.2.1]
    at grails.plugin.cache.web.ProxyAwareMixedGrailsControllerHelper.handleURI(ProxyAwareMixedGrailsControllerHelper.java) ~[plugin-classes/:na]
    at org.codehaus.groovy.grails.web.servlet.mvc.AbstractGrailsControllerHelper.handleURI(AbstractGrailsControllerHelper.java:116) ~[grails-web-2.2.1.jar:2.2.1]
    at grails.plugin.cache.web.ProxyAwareMixedGrailsControllerHelper.handleURI(ProxyAwareMixedGrailsControllerHelper.java) ~[plugin-classes/:na]
    at org.codehaus.groovy.grails.web.servlet.mvc.SimpleGrailsController.handleRequest(SimpleGrailsController.java:72) ~[grails-web-2.2.1.jar:2.2.1]
    at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48) ~[spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.codehaus.groovy.grails.web.servlet.GrailsDispatcherServlet.doDispatch(GrailsDispatcherServlet.java:328) ~[grails-web-2.2.1.jar:2.2.1]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) [spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) [spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) [spring-webmvc-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:195) [plugin-classes/:na]
    at grails.plugin.cache.web.filter.simple.MemoryPageFragmentCachingFilter.doFilter(MemoryPageFragmentCachingFilter.java) [plugin-classes/:na]
    at grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63) [plugin-classes/:na]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:70) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:70) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:70) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.codehaus.groovy.grails.web.util.WebUtils.forwardRequestForUrlMappingInfo(WebUtils.java:314) [grails-web-2.2.1.jar:2.2.1]
    at org.codehaus.groovy.grails.web.util.WebUtils.forwardRequestForUrlMappingInfo(WebUtils.java:279) [grails-web-2.2.1.jar:2.2.1]
    at org.codehaus.groovy.grails.web.util.WebUtils.forwardRequestForUrlMappingInfo(WebUtils.java:270) [grails-web-2.2.1.jar:2.2.1]
    at org.codehaus.groovy.grails.web.mapping.filter.UrlMappingsFilter.doFilterInternal(UrlMappingsFilter.java:221) [grails-plugin-url-mappings-2.2.1.jar:2.2.1]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter.obtainContent(GrailsPageFilter.java:200) [grails-web-2.2.1.jar:2.2.1]
    at org.codehaus.groovy.grails.web.sitemesh.GrailsPageFilter.doFilter(GrailsPageFilter.java:151) [grails-web-2.2.1.jar:2.2.1]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at javax.servlet.FilterChain$doFilter.call(Unknown Source) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.grails.plugin.resource.DevModeSanityFilter.doFilter(DevModeSanityFilter.groovy:44) [plugin-classes/:na]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequestFilter.doFilterInternal(GrailsWebRequestFilter.java:69) [grails-web-2.2.1.jar:2.2.1]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.codehaus.groovy.grails.web.filters.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:66) [grails-web-2.2.1.jar:2.2.1]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259) [spring-web-3.1.4.RELEASE.jar:3.1.4.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312) [tomcat-embed-core-7.0.30.jar:7.0.30]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_17]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_17]
    at java.lang.Thread.run(Thread.java:722) [na:1.7.0_17]
Caused by: org.codehaus.groovy.grails.web.servlet.mvc.exceptions.ControllerExecutionException: Runtime error executing action
    at org.codehaus.groovy.grails.web.servlet.mvc.MixedGrailsControllerHelper.invoke(MixedGrailsControllerHelper.java:73) ~[grails-web-2.2.1.jar:2.2.1]
    at grails.plugin.cache.web.ProxyAwareMixedGrailsControllerHelper.invoke(ProxyAwareMixedGrailsControllerHelper.java) ~[plugin-classes/:na]
    at org.codehaus.groovy.grails.web.servlet.mvc.AbstractGrailsControllerHelper.handleAction(AbstractGrailsControllerHelper.java:334) ~[grails-web-2.2.1.jar:2.2.1]
    at grails.plugin.cache.web.ProxyAwareMixedGrailsControllerHelper.handleAction(ProxyAwareMixedGrailsControllerHelper.java) ~[plugin-classes/:na]
    at org.codehaus.groovy.grails.web.servlet.mvc.AbstractGrailsControllerHelper.executeAction(AbstractGrailsControllerHelper.java:217) ~[grails-web-2.2.1.jar:2.2.1]
    ... 76 common frames omitted
Caused by: java.lang.reflect.InvocationTargetException: null
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_17]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_17]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_17]
    at java.lang.reflect.Method.invoke(Method.java:601) ~[na:1.7.0_17]
    at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1243) ~[springloaded-core-1.1.1.jar:1.0.0]
    at org.codehaus.groovy.grails.web.servlet.mvc.MixedGrailsControllerHelper.invoke(MixedGrailsControllerHelper.java:69) ~[grails-web-2.2.1.jar:2.2.1]
    ... 80 common frames omitted
Caused by: java.lang.IllegalArgumentException: The solver configuration (C:\Users\rahulserver\IdeaProjects\OptaPlannerGrails\web-app\xmls\cloudBalancingSolverConfig.xml) does not exist.
    at org.optaplanner.core.config.solver.XmlSolverFactory.configure(XmlSolverFactory.java:65) ~[optaplanner-core-6.0.0.CR5.jar:6.0.0.CR5]
    at org.optaplanner.core.config.solver.XmlSolverFactory.<init>(XmlSolverFactory.java:51) ~[optaplanner-core-6.0.0.CR5.jar:6.0.0.CR5]
    at optaplannergrails.CloudBalanceDomainController.save(CloudBalanceDomainController.groovy:35) ~[classes/:na]
    at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:195) [plugin-classes/:na]
    at grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63) [plugin-classes/:na]
    ... 3 common frames omitted

It says that java.lang.IllegalArgumentException: The solver configuration (C:\Users\....\IdeaProjects\OptaPlannerGrails\web-app\xmls\cloudBalancingSolverConfig.xml) does not exist. However, surprising thing is that f.exists() returns true, hence the file is being found. So what may be causing this error?

EDIT: f.canRead() and f.canWrite() also returns true.Hence the file has both read and write permissions. Although it does not need to write to the file here.

permissions???? (total guess hence the comment) – Smitty Feb 08 '14 at 05:56 — Smitty, Feb 08 '14 at 05:56

score 1 · Answer 1 · answered Feb 09 '14 at 13:05

1

It's looking for the solver configuration in the classpath with getClass().getResource("..."). Files or URL's are not supported that way (but you can mimic this by building your own KieBase base upon a file).

So if your file is in C:\Users\....\IdeaProjects\OptaPlannerGrails\src\main\resources\org\foo\bar\solverConfig.xml in a maven project, you 'd get it with /org/foo/bar/solverConfig.xml because src/main/resources is part of the java classpath in maven. If web-app\xmls\ is part of the classpath (which it probably isn't because it's part of the war resources probably) just cloudBalancingSolverConfig.xml would work.

Anyway, you probably want to make sure your xml ends up in yourWebApp.war!/WEB-INF/classes/org/foo/bar/solverConfig.xml and load it with /org/foo/bar/solverConfig.xml

answered Feb 09 '14 at 13:05

Geoffrey De Smet

26,223
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Unfortunately I don't have the bandwidth (nor the expertise) to maintain a grails (or rubyOnRails or scala's lift) version of the optaplanner-examples.jar (which is swing based). I already struggle to keep the optaplanner-webexamples.war (JSP based) up to date, and it only has 2 of the examples. If someone wrote such a public grails example (I 've heard about other non-public implementations already), I am happy to link it from the blog etc :) – Geoffrey De Smet Feb 10 '14 at 07:44
In any case, optaplanner itself doesn't care whether it runs in grails/rubyOnRails/lift/jsp/jsf/gwt/swing/...: as long as it's a valid JVM, it's works :) I will add a section in the manual "integration with web frameworks" to better explain the fact that scoreDrl expects for a classpath resource, not a web resource or a file. If you think the other ways are useful too, file a jira. – Geoffrey De Smet Feb 10 '14 at 07:46
I dont get you.Grails projects are different from maven. Do you want to say that the xml file must be in classpath? – rahulserver Mar 12 '14 at 17:29

score 0 · Answer 2 · answered Nov 18 '16 at 16:31

If other answers do not help (like in my case when packaging solverConfig.xml into a Spring Boot application) then this small change might help you out:

SolverFactory.<PlanningSolution<BendableScore>>createFromXmlInputStream(
                    getClass().getClassLoader().getResourceAsStream("org/foo/bar/solverConfig.xml"))

The solver configuration does not exist error in grails optaplanner

2 Answers2