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java.lang.NullPointerException: 	at org.apache.catalina.loader.WebappClassLoader.findResources(WebappClassLoader.java:1334)	at java.lang.ClassLoader.getResources(ClassLoader.java:1185)	at java.lang.ClassLoader.getResources(ClassLoader.java:1181)	at hudson.util.MaskingClassLoader.getResources(MaskingClassLoader.java:89)	at java.lang.ClassLoader.getResources(ClassLoader.java:1181)	at org.apache.tools.ant.AntClassLoader.findResources(AntClassLoader.java:957)	at hudson.PluginFirstClassLoader.findResources(PluginFirstClassLoader.java:79)	at org.apache.tools.ant.AntClassLoader.findResources(AntClassLoader.java:935)	at hudson.PluginFirstClassLoader.findResources(PluginFirstClassLoader.java:87)	at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at jenkins.ClassLoaderReflectionToolkit.invoke(ClassLoaderReflectionToolkit.java:44)	at jenkins.ClassLoaderReflectionToolkit._findResources(ClassLoaderReflectionToolkit.java:103)	at hudson.PluginManager$UberClassLoader.findResources(PluginManager.java:1171)	at java.lang.ClassLoader.getResources(ClassLoader.java:1185)	at java.lang.ClassLoader.getResources(ClassLoader.java:1181)	at org.codehaus.groovy.transform.ASTTransformationVisitor.doAddGlobalTransforms(ASTTransformationVisitor.java:194)	at org.codehaus.groovy.transform.ASTTransformationVisitor.addGlobalTransforms(ASTTransformationVisitor.java:187)	at org.codehaus.groovy.transform.ASTTransformationVisitor.addPhaseOperations(ASTTransformationVisitor.java:150)	at org.codehaus.groovy.control.CompilationUnit.(CompilationUnit.java:186)	at org.codehaus.groovy.control.CompilationUnit.(CompilationUnit.java:118)	at groovy.lang.GroovyClassLoader.createCompilationUnit(GroovyClassLoader.java:476)	at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:290)	at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:281)	at groovy.lang.GroovyShell.parseClass(GroovyShell.java:731)	at groovy.lang.GroovyShell.parse(GroovyShell.java:743)	at groovy.lang.GroovyShell.parse(GroovyShell.java:723)	at groovy.lang.GroovyShell.evaluate(GroovyShell.java:680)	at groovy.lang.GroovyShell.evaluate(GroovyShell.java:666)	at hudson.plugins.groovy.SystemGroovy.perform(SystemGroovy.java:81)	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:785)	at hudson.model.Build$BuildExecution.build(Build.java:205)	at hudson.model.Build$BuildExecution.doRun(Build.java:162)	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:537)	at hudson.model.Run.execute(Run.java:1741)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:98)	at hudson.model.Executor.run(Executor.java:408)