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  1. ,
    Expert tip

    This might be an issue with the file location in the Spark submit command. Try it with

    spark-submit --master spark://master:7077 \
         hello_world_from_pyspark.py {file location}
    
    
  2. ,
    Expert tip

    Check if you've set a name in Application -> Run. If you didn't, the generated XML is gonna have missing information and then this exception will be thrown.

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java.lang.ClassNotFoundException: [:]	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:264)	at grails.plugin.springsecurity.SpringSecurityService.reloadDBRoleHierarchy(SpringSecurityService.groovy:154)	at grails.plugin.springsecurity.SpringSecurityService$reloadDBRoleHierarchy.call(Unknown Source)	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)	at test.TestService.createRole(TestService.groovy:21)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:384)	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1024)	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69)	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:166)	at undefined.BootStrap$_closure1$_closure3.doCall(BootStrap.groovy:11)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1024)	at groovy.lang.Closure.call(Closure.java:414)	at groovy.lang.Closure.call(Closure.java:430)	at org.codehaus.groovy.runtime.DefaultGroovyMethods.with(DefaultGroovyMethods.java:242)	at org.codehaus.groovy.runtime.dgm$757.invoke(Unknown Source)	at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoMetaMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:251)	at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.call(PogoMetaMethodSite.java:71)	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)	at undefined.BootStrap$_closure1.doCall(BootStrap.groovy:9)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)	at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1024)	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1089)	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1024)	at groovy.lang.Closure.call(Closure.java:414)	at groovy.lang.Closure.call(Closure.java:408)	at grails.util.Environment.evaluateEnvironmentSpecificBlock(Environment.java:437)	at grails.util.Environment.executeForEnvironment(Environment.java:430)	at grails.util.Environment.executeForCurrentEnvironment(Environment.java:406)	at org.grails.web.servlet.boostrap.DefaultGrailsBootstrapClass.callInit(DefaultGrailsBootstrapClass.java:62)	at org.grails.web.servlet.context.GrailsConfigUtils.executeGrailsBootstraps(GrailsConfigUtils.java:65)	at org.grails.plugins.web.servlet.context.BootStrapClassRunner.onStartup(BootStrapClassRunner.groovy:53)	at grails.boot.config.GrailsApplicationPostProcessor.onApplicationEvent(GrailsApplicationPostProcessor.groovy:238)	at grails.boot.config.GrailsApplicationPostProcessor.onApplicationEvent(GrailsApplicationPostProcessor.groovy)	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:166)	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:381)	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:335)	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:855)	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:140)	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541)	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766)	at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)	at grails.boot.GrailsApp.run(GrailsApp.groovy:55)	at grails.boot.GrailsApp.run(GrailsApp.groovy:374)