Parsing fails when using a character sequence

[Azenet]

Problem description

Parsing fails when using a sequence that matches \\[^0-7'"]\+\$ (example: \s+$), parse endpoint does a 500 error and the following exception is thrown:

2017-05-22 15:29:47,095 ERROR: org.graylog2.shared.rest.exceptionmappers.AnyExceptionClassMapper - Unhandled exception in REST resource
java.lang.NullPointerException: null
        at org.graylog.plugins.pipelineprocessor.parser.PipelineRuleParser$RuleTypeAnnotator.exitMultiplication(PipelineRuleParser.java:718) ~[?:?]
        at org.graylog.plugins.pipelineprocessor.parser.RuleLangParser$MultiplicationContext.exitRule(RuleLangParser.java:642) ~[?:?]
        at org.antlr.v4.runtime.tree.ParseTreeWalker.exitRule(ParseTreeWalker.java:71) ~[?:?]
        at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:54) ~[?:?]
        at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:52) ~[?:?]
        at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:52) ~[?:?]
        at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:52) ~[?:?]
        at org.antlr.v4.runtime.tree.ParseTreeWalker.walk(ParseTreeWalker.java:52) ~[?:?]
        at org.graylog.plugins.pipelineprocessor.parser.PipelineRuleParser.parseRule(PipelineRuleParser.java:171) ~[?:?]
        at org.graylog.plugins.pipelineprocessor.parser.PipelineRuleParser.parseRule(PipelineRuleParser.java:135) ~[?:?]
        at org.graylog.plugins.pipelineprocessor.rest.RuleResource.parse(RuleResource.java:119) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor288.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_72-internal]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_72-internal]
        at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81) ~[graylog.jar:?]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144) ~[graylog.jar:?]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161) ~[graylog.jar:?]
        at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:205) ~[graylog.jar:?]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99) ~[graylog.jar:?]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389) ~[graylog.jar:?]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347) ~[graylog.jar:?]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102) ~[graylog.jar:?]
        at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326) [graylog.jar:?]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) [graylog.jar:?]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) [graylog.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:315) [graylog.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:297) [graylog.jar:?]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:267) [graylog.jar:?]
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) [graylog.jar:?]
        at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) [graylog.jar:?]
        at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) [graylog.jar:?]
        at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:384) [graylog.jar:?]
        at org.glassfish.grizzly.http.server.HttpHandler$1.run(HttpHandler.java:224) [graylog.jar:?]
        at com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176) [graylog.jar:?]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_72-internal]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_72-internal]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_72-internal]

Steps to reproduce the problem

1. Create new pipeline rule
2. Paste this:

rule "example"
when
  true
then
  let a = "\s+$"
end

Environment

• Graylog Version: 2.3.0-alpha.2+f24e575
• Pipeline Processor plugin version: 2.3.0-alpha.2
• Elasticsearch Version: 5.4.0
• MongoDB Version: 3.4.4
• Operating System: Linux/Docker
• Browser version: Chrome 58

[joschi]

@Azenet The backslash character has to be escaped, i. e. "\\s" instead of "\s".

This being said, forgetting to escape the backslash character should not trigger a NullPointerException.

[bernd]

@Azenet Does escaping the backslash character help?

[Azenet]

@bernd yes, once it is escaped it works properly.