[groovy-user] Please help me to figure out why a builder's methods are not called

[Serge]

Hello All,

I need to read a file containg a DSL from filesystem.  I have written a test1 for that, but it fails. Surprisingly test2 works. Any idea how to make test1 work ? Maven project with sources is attached.

Test1 fails:  
          groovy.lang.MissingMethodException: No signature of method: org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.compile() is applicable for argument types: (Script1$_run_closure1_closure2) values: ...

Maven project with sources is attached,
---------------- TestDsl.groovy--------------------------------
mport org.testng.annotations.Test
import javax.script.ScriptEngine
import javax.script.ScriptEngineManager
import org.testng.annotations.BeforeMethod
import javax.script.ScriptContext

class TestDsl {

  MyBuilder builder

  @BeforeMethod
  void init() {
    builder = new MyBuilder()
  }

  @Test
  void test1() { // This test does the same as test2, but fails
    ScriptEngineManager factory = new ScriptEngineManager();
    ScriptEngine engine = factory.getEngineByName("Groovy");
    InputStreamReader reader = new InputStreamReader(getClass().getResourceAsStream('script.groovy'))
    try {
      def bindings = engine.createBindings()
      bindings.put('builder', builder)
      engine.setBindings(bindings, ScriptContext.ENGINE_SCOPE)
      engine.eval(reader)
    } finally {
      reader.close()
    }
  }

  @Test
  void test2() {   // This test is ok
    builder.build {
      compile {
        main {
          println 'hello main'
        }
        test {
          println 'hello test'
        }
      }
    }
  }
}

------------------ script.groovy ------------
builder.build {
   compile {
     main {
        println 'hello main'
     }
     test {
        println 'hello test'
     }
   }
}
-------------  MyBuilder.groovy --------------
class MyBuilder extends BuilderSupport {
  protected void setParent(Object parent, Object child) {
  }

  protected Object createNode(Object name) {

  }

  protected Object createNode(Object name, Object value) {

  }

  protected Object createNode(Object name, Map attributes) {

  }

  protected Object createNode(Object name, Map attributes, Object value) {

  }
}

[Roshan Dawrani]

Which groovy version are you on?

If I try it on 1.7.5, it almost works.

--
rgds,
Roshan
http://roshandawrani.wordpress.com/

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[Serge]

I have upgraded Groovy dependency to 1.7.4, it still fails.  I am using JDK 1.6.20.
Updated code  attached.

[Roshan Dawrani]

Did you notice any change in the error message? Can you provide the error that you get with 1.7.4?

What was the groovy version that you were earlier using?

[Serge]

Yes, I there is a difference in error messages

With Groovy 1.6.5 I had  : -------------------------------------------------------------------------------------------------------------------------------

javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.compile() is applicable for argument types: (Script1$_run_closure1_closure2) values: [Script1$_run_closure1_closure2@16daa9]

	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:118)
	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:104)
	at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:232)

	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:229)
	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:52)

	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)

	at TestDsl.test1(TestDsl.groovy:25)
	at org.apache.maven.surefire.testng.TestNGExecutor.run(TestNGExecutor.java:62)
	at org.apache.maven.surefire.testng.TestNGDirectoryTestSuite.execute(TestNGDirectoryTestSuite.java:141)

	at org.apache.maven.surefire.Surefire.run(Surefire.java:180)
	at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:350)
	at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1021)

Caused by: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.compile() is applicable for argument types: (Script1$_run_closure1_closure2) values: [Script1$_run_closure1_closure2@16daa9]

	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:318)
	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:112)
	... 41 more

With Groovy 1.7.4 I have         -------------------------------------------------------------------------------------------------------------------------

javax.script.ScriptException: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: static Script1.main() is applicable for argument types: (Script1$_run_closure1_closure2_closure3) values: [Script1$_run_closure1_closure2_closure3@17b40fe]

Possible solutions: main([Ljava.lang.String;), wait(), wait(long), run(), run(), any()
	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:117)
	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:103)

	at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:232)
	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite$PojoCachedMethodSiteNoUnwrapNoCoerce.invoke(PojoMetaMethodSite.java:229)
	at org.codehaus.groovy.runtime.callsite.PojoMetaMethodSite.call(PojoMetaMethodSite.java:52)

	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)

	at TestDsl.test1(TestDsl.groovy:27)
	at org.apache.maven.surefire.testng.TestNGExecutor.run(TestNGExecutor.java:62)
	at org.apache.maven.surefire.testng.TestNGDirectoryTestSuite.execute(TestNGDirectoryTestSuite.java:141)

	at org.apache.maven.surefire.Surefire.run(Surefire.java:180)
	at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:350)
	at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1021)

Caused by: javax.script.ScriptException: groovy.lang.MissingMethodException: No signature of method: static Script1.main() is applicable for argument types: (Script1$_run_closure1_closure2_closure3) values: [Script1$_run_closure1_closure2_closure3@17b40fe]

Possible solutions: main([Ljava.lang.String;), wait(), wait(long), run(), run(), any()
	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:317)
	at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:111)

[Roshan Dawrani]

Great - that is why I had initially written that I am almost seeing it working.

When you have the DSL as:
------------------------------script1.groovy-------------------------
builder.build {
   compile {
     main {
        ...
     }
...
   }
}
-------------------------------------------------------

the error you are getting (No signature of method: static Script1.main()) is correct behavior because every groovy script implicitly gets a main() as the entry point of that script and the in the compiled DSL, main {..} is getting mapped to that static main(String[]), which fails at runtime when the DSL closure gets passed to it.

So, change "main { }"...to use something other than "main" to avoid the conflict and it should be fine!

Cheers,
Roshan

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[Serge]

Thank you very much, Roshan, it works now.