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NoMethodError: undefined method `current' for Java::JavaLang::Thread:Class #4901

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javalovercn opened this issue Dec 17, 2017 · 2 comments
Closed

NoMethodError: undefined method `current' for Java::JavaLang::Thread:Class #4901

javalovercn opened this issue Dec 17, 2017 · 2 comments
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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 Thread.getAllStackTraces().size().to_s# invoke java Thread\n");

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

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

we can't remove "import java.lang.Thread" because user is required to access java Thread.
if change jruby-complete-9.1.15.0.jar to jruby-complete-1.7.3.jar, it works well.

Console output

#<Thread:0x6b95c03e>
============================
uri:classloader:/jruby/java/core_ext/object.rb:95: warning: already initialized constant Thread
4
============================
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:0x6b95c03e>
============================
4
============================
#<Thread:0x6b95c03e>

Environment

jruby-complete-9.1.15.0.jar
@mkristian
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you should just use the qualified classname: java.lang.Thread.getAllStackTraces().size().to_s or alias the java Thread class with JThread = java.lang.Thread and use JThread where needed.

not a bug for me.

@kares
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kares commented Dec 17, 2017

Kristian is right, this is a 'known' JRuby feature.
you need to be careful when importing colliding Java classes e.g. String or Thread

@kares kares closed this as completed Dec 17, 2017
@kares kares added this to the Invalid or Duplicate milestone Dec 17, 2017
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@mkristian @kares @javalovercn