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seltzerlj (14) [Avatar] Offline
#1
This code, copied and pasted from page 99, throws the exception indicated below (I'm using Groovy 1.7.5). Is there a good reason for this?

Thanks.

Larry

def matcher = 'a b c' =~ /S/
assert matcher[0] == 'a'
assert matcher[1..2] == ['b','c']
assert matcher.size() == 3

The output:

groovy> def matcher = 'a b c' =~ /S/
groovy> assert matcher[0] == 'a'
groovy> assert matcher[1..2] == ['b','c']
groovy> assert matcher.size() == 3

Exception thrown
Oct 23, 2010 12:46:48 PM org.codehaus.groovy.runtime.StackTraceUtils sanitize

WARNING: Sanitizing stacktrace:

java.lang.IndexOutOfBoundsException: index is out of range 0..-1 (index = 0)
at org.codehaus.groovy.runtime.DefaultGroovyMethods.getAt(DefaultGroovyMethods.java:4221)
at org.codehaus.groovy.runtime.dgm$234.invoke(Unknown Source)
at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoMetaMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:270)
at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:52)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:124)
at ConsoleScript0.run(ConsoleScript0:2)
at groovy.lang.GroovyShell.runScriptOrMainOrTestOrRunnable(GroovyShell.java:264)
at groovy.lang.GroovyShell.run(GroovyShell.java:513)
at groovy.lang.GroovyShell.run(GroovyShell.java:170)
at groovy.lang.GroovyShell$run.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:132)
at groovy.ui.Console$_runScriptImpl_closure16.doCall(Console.groovy:890)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:8smilie
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:273)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:886)
at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:66)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:44)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:141)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:149)
at groovy.ui.Console$_runScriptImpl_closure16.doCall(Console.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:8smilie
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:273)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:886)
at groovy.lang.Closure.call(Closure.java:276)
at groovy.lang.Closure.call(Closure.java:271)
at groovy.lang.Closure.run(Closure.java:354)
at java.lang.Thread.run(Thread.java:662)
java.lang.IndexOutOfBoundsException: index is out of range 0..-1 (index = 0)
at ConsoleScript0.run(ConsoleScript0:2)
Mittie (397) [Avatar] Offline
#2
Re: Exception thrown from code on p. 99
There is a backslash missing before the S.
The first line must be

def matcher = 'a b c' =~ /S/

It appears that the typesetting process has somehow removed the character.

Thanks a lot for the posting!
Dierk

Note to all other editors: we have to check all backslashes!