ArrayIndexOutOfBoundsException in RubyString.cat
------------------------------------------------
Key: JRUBY-4592
URL: http://jira.codehaus.org/browse/JRUBY-4592
Project: JRuby
Issue Type: Bug
Affects Versions: JRuby 1.4
Environment: Ubuntu 9.10, x86
jruby 1.4.0 (ruby 1.8.7 patchlevel 174) (2010-02-03 6586) (Java HotSpot(TM)
Client VM 1.6.0_15) [i386-java]
Reporter: Neil Brown
Assignee: Thomas E Enebo
I have an uncaught Java exception occurring in JRuby. This is for a Ruby on
Rails installation running on JRuby, and the exception stops the entire server
responding until manually restarted, which is obviously an issue for us.
Here's what I can discern of the bug: we use Maruku
(http://maruku.rubyforge.org/) to process Markdown into HTML. Markdown feeds
the HTML into REXML (http://www.germane-software.com/software/rexml/) to parse
it. If you feed the libraries malformed HTML (e.g. an unclosed tag), it
returns output just fine (with an error in the HTML output). If you feed it
unicode characters (e.g. a non-exotic 2-byte UTF-8 character such as an o with
an umlaut), it is fine. If you feed it malformed HTML with a unicode
character, JRuby throws an uncaught ArrayOutOfBoundsException arising in the
RubyString.cat method where it calls System.arraycopy. (I wonder if this is an
issue of number-of-characters versus number-of-bytes?) Here's the Java stack
trace:
begin = 0
len = 2
bytes = [-61]
0, 2, [-61]
Exception in thread "Thread-7" java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at org.jruby.RubyString.cat(RubyString.java:1080)
at org.jruby.RubyString.inspectCommon(RubyString.java:2154)
at org.jruby.RubyString.inspect(RubyString.java:2093)
at sun.reflect.GeneratedMethodAccessor190.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.jruby.internal.runtime.methods.ReflectedJavaMethod.call(ReflectedJavaMethod.java:108)
at
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:172)
at
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:168)
at
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:107)
at org.jruby.ast.CallNoArgNode.interpret(CallNoArgNode.java:61)
at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
at org.jruby.ast.EvStrNode.interpret(EvStrNode.java:86)
at org.jruby.ast.DStrNode.appendToString(DStrNode.java:86)
at org.jruby.ast.DStrNode.buildDynamicString(DStrNode.java:76)
at org.jruby.ast.DStrNode.interpret(DStrNode.java:68)
at org.jruby.ast.FCallOneArgNode.interpret(FCallOneArgNode.java:36)
at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
at org.jruby.ast.IfNode.interpret(IfNode.java:117)
at org.jruby.ast.IfNode.interpret(IfNode.java:119)
at org.jruby.ast.IfNode.interpret(IfNode.java:119)
at org.jruby.ast.IfNode.interpret(IfNode.java:119)
at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
at org.jruby.ast.WhenOneArgNode.when(WhenOneArgNode.java:49)
at org.jruby.ast.CaseNode.interpret(CaseNode.java:133)
at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
at org.jruby.ast.UntilNode.interpret(UntilNode.java:120)
at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
at
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:173)
at
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:147)
at org.jruby.ast.CallOneArgNode.interpret(CallOneArgNode.java:57)
at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
at org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
at org.jruby.ast.WhileNode.interpret(WhileNode.java:131)
at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
...
The whole trace is about 100-200 lines of similar information. I can't easily
track down the problem any further because the Java stack trace doesn't tell me
anything about which bit of Ruby code caused the problem (what flags could I
set to allow me to do so?). I can reproduce this error consistently and easily
so I'm happy to help track down the problem if someone can direct me as to how.
I did wonder if I should report this to the Maruku/REXML maintainers instead --
I would have if it gave a Ruby exception, but since it's a Java exception I
figured it counts as a JRuby problem.
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