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NoMethodError: undefined method `current' for Java::JavaLang::Thread:Class #4897

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javalovercn opened this issue Dec 16, 2017 · 1 comment
Closed

NoMethodError: undefined method `current' for Java::JavaLang::Thread:Class #4897

javalovercn opened this issue Dec 16, 2017 · 1 comment
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Invalid or Duplicate

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@javalovercn
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ScriptingContainer c = new ScriptingContainer();

c.runScriptlet("#this is script A\n" +
		"puts Thread.current.to_s");

System.out.println("============================");

c.runScriptlet("#this is script B\n" +
		"import java.lang.Thread\n" +
		"puts 'hello'");

System.out.println("============================");

c.runScriptlet("#this is script C\n" +
		"puts Thread.current.to_s");

Console output

#<Thread:0x5782ce4d>
============================
hello
============================
uri:classloader:/jruby/java/core_ext/object.rb:95: warning: already initialized constant Thread
NoMethodError: undefined method `current' for Java::JavaLang::Thread:Class
Did you mean?  currentThread
  method_missing at org/jruby/RubyBasicObject.java:1657
          <main> at <script>:2
Exception in thread "main" org.jruby.embed.EvalFailedException: (NoMethodError) undefined method `current' for Java::JavaLang::Thread:Class
Did you mean?  currentThread
	at org.jruby.embed.internal.EmbedEvalUnitImpl.run(EmbedEvalUnitImpl.java:131)
	at org.jruby.embed.ScriptingContainer.runUnit(ScriptingContainer.java:1307)
	at org.jruby.embed.ScriptingContainer.runScriptlet(ScriptingContainer.java:1300)
	at com.TestThread.main(TestThread.java:22)
Caused by: org.jruby.exceptions.RaiseException: (NoMethodError) undefined method `current' for Java::JavaLang::Thread:Class
Did you mean?  currentThread
	at org.jruby.RubyBasicObject.method_missing(org/jruby/RubyBasicObject.java:1657)
	at RUBY.<main>(<script>:2)

Expected output

#<Thread:0x5782ce4d>
============================
hello
============================
#<Thread:0x5782ce4d>

Environment

jruby-complete-9.1.15.0.jar
@kares
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kares commented Dec 16, 2017

you import import java.lang.Thread Java's thread into default Object name-space
... so you end up aliasing Ruby's Thread to java.lang.Thread than there's no current in Java's world
the warnings/messages are pretty clear about it :

warning: already initialized constant Thread

undefined method `current' for Java::JavaLang::Thread

remove the import line and Thread.current will work as (Ruby) expected

@kares kares added this to the Invalid or Duplicate milestone Dec 16, 2017
@kares kares closed this as completed Dec 16, 2017
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@kares @javalovercn