Different overloaded Java methods called when JVM runs in client or server mode
on Solaris
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Key: JRUBY-4905
URL: http://jira.codehaus.org/browse/JRUBY-4905
Project: JRuby
Issue Type: Bug
Components: Java Integration
Affects Versions: JRuby 1.5.1
Environment: Solaris 5.10
JDK 1.5.0_15-b04 and 1.5.0_12-b04
JFreeChart 1.0.12
Reporter: Brent Snook
Priority: Minor
Attachments: jcommon-1.0.15.jar, jfreechart-1.0.12.jar
Calling the overloaded addValue() method in a JFreeChart DefaultCategoryDataset
(http://www.jfree.org/jfreechart/api/javadoc/org/jfree/data/category/DefaultCategoryDataset.html)
running the JVM in client and server mode seems to result in different
results. The method has two versions that take a java.lang.Number and double
primitive.
Running in server mode results in a TypeError:
{code}
export CLASSPATH=.:jfreechart-1.0.12.jar:jcommon-1.0.15.jar:$CLASSPATH
jruby --server $JRUBY_HOME/bin/jirb
irb(main):001:0> require 'java'
=> true
irb(main):002:0> import 'org.jfree.data.category.DefaultCategoryDataset'
=> ["org.jfree.data.category.DefaultCategoryDataset"]
irb(main):003:0> DefaultCategoryDataset.new.add_value 5, :thing, "key"
TypeError: could not coerce Fixnum to class java.lang.Number
from (irb):3
{code}
This leads me to believe that it is attempting to call the Number version of
addValue(). Doing the same running in client mode results in no problems, which
in turn makes me think that in this case it is calling the double version.
The problem has surfaced since an upgrade from JRuby 1.3 to 1.5.1.
I can't reproduce this with a simplified Java class example which leads me to
believe that the JFreeChart library may also have something to do with it.
I've also tried to reproduce this on Ubuntu 10.4 with JDK 1.5.0_16-b02 but it
only seems to affect Solaris.
We have this problem in combination with [JRUBY-3279]. Our work-around is to
force a call of the Number signature of the method along with an explicit cast
to Integer:
{code}
class CategoryDataset < org.jfree.data.category.DefaultCategoryDataset
def add_integer_value(value, row_key, column_key)
signature = [java.lang.Number.java_class,
java.lang.Comparable.java_class, java.lang.Comparable.java_class]
java_send(:addValue, signature, value.to_java(java.lang.Integer),
row_key, column_key)
end
end
{code}
JFreeChart jars are attached; drop them into a directory and run example above
under Solaris 5.10 to reproduce.
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