ruby2java needs to cast return values to java.lang.String
---------------------------------------------------------
Key: JRUBY-3801
URL: http://jira.codehaus.org/browse/JRUBY-3801
Project: JRuby
Issue Type: Bug
Components: Java Integration
Affects Versions: JRuby 1.3.1
Environment: OS X 10.5.7 on G4
Reporter: Ian Dees
Given the following Ruby file:
{code:title=sample.rb}
Sample
def bar
"Hello from Ruby"
end
if defined? Ruby2Java
signature :bar, [] => java.lang.String
end
end
{code}
... and the following Java file:
{code:title=SampleTest.java}
public class SampleTest {
public static void main(String args[]) {
Sample s = new Sample();
}
}
{code}
When you run:
{noformat}
ruby2java Sample sample.rb
java -cp jruby.jar:. SampleTest
{noformat}
The following error occurs:
{noformat}
Exception in thread "main" java.lang.VerifyError: (class: Sample, method: bar
signature: ()Ljava/lang/String;) Illegal type in constant pool
at SampleTest.main(SampleTest.java:3)
{noformat}
Per Charlie, here's the {{bar}} method, disassembled:
{noformat}
public java.lang.String bar();
Code:
Stack=4, Locals=2, Args_size=1
0: aload_0
1: dup
2: invokeinterface #52, 1; //InterfaceMethod
org/jruby/runtime/builtin/IRubyObject.getRuntime:()Lorg/jruby/Ruby;
7: dup
8: astore_1
9: invokevirtual #56; //Method
org/jruby/Ruby.getCurrentContext:()Lorg/jruby/runtime/ThreadContext;
12: ldc #57; //String bar
14: iconst_0
15: anewarray #49; //class org/jruby/runtime/builtin/IRubyObject
18: invokevirtual #63; //Method
org/jruby/RubyBasicObject.callMethod:(Lorg/jruby/runtime/ThreadContext;Ljava/lang/String;[Lorg/jruby/runtime/builtin/IRubyObject;)Lorg/jruby/runtime/builtin/IRubyObject;
21: ldc #65; //class java/lang/String
23: invokestatic #71; //Method
org/jruby/javasupport/JavaUtil.convertRubyToJava:(Lorg/jruby/runtime/builtin/IRubyObject;Ljava/lang/Class;)Ljava/lang/Object;
26: areturn
{noformat}
Charlie points out that the Ruby string should be cast to a java.lang.String
before returning.
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