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  1. JDK
  2. JDK-8051443

Bogus "no suitable method found" error from javac

    Details

    • Subcomponent:
    • Introduced In Build:
      b20
    • Introduced In Version:
    • CPU:
      generic
    • OS:
      other

      Description

      FULL PRODUCT VERSION :
      java version "1.8.0_20-ea"
      Java(TM) SE Runtime Environment (build 1.8.0_20-ea-b23)
      Java HotSpot(TM) 64-Bit Server VM (build 25.20-b22, mixed mode)

      ADDITIONAL OS VERSION INFORMATION :
      OS X 10.9.4

      A DESCRIPTION OF THE PROBLEM :
      Some combination of generics and the new Stream APIs is not compiling with 8u20 b23 this is code that compiles find with 8u11. The error reported is: "no suitable method found", but the 8u11 compiler find a the correct method and the code runs as expected.

      REGRESSION. Last worked in version 8u11

      ADDITIONAL REGRESSION INFORMATION:
      This version is working:
      java version "1.8.0_11"
      Java(TM) SE Runtime Environment (build 1.8.0_11-b12)
      Java HotSpot(TM) 64-Bit Server VM (build 25.11-b03, mixed mode)

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      The code being compiled is:

      Class<? extends StandardRootBean> genericFindClass = null;
      // most of these classes implement the SoftDelete interface (defined below)
      if( StringUtils.equals(entityName, Agent.class.getName()) ) {
      genericFindClass = AgentBean.class;
      } else if( StringUtils.equals(entityName, PluginsRepo.class.getName()) ) {
      genericFindClass = PluginsRepoBean.class;
      } else if( StringUtils.equals(entityName, TestSuite.class.getName()) ) {
      genericFindClass = TestSuiteBean.class;
      } else if( StringUtils.equals(entityName, TestSubmission.class.getName()) ) {
      genericFindClass = TestSubmissionBean.class;
      } else if( StringUtils.equals(entityName, User.class.getName()) ) {
      genericFindClass = UserBean.class;
      } else {
      throw new WebServiceException("Unhandled findAll class: "+entityName);
      }
      if( genericFindClass != null ) {
      // Classes that just use the DB findAll() method...
      List<?> dbList = db.findAll(genericFindClass, null);
      // Filter deleted elements if applicable
      if( SoftDelete.class.isAssignableFrom(genericFindClass) ) {
      dbList = dbList.stream().filter( o-> !((SoftDelete)o).isDeletedFlag() ).collect( Collectors.toList()); // <-- error on this line with 8u20
      }
      GenericContainer result = new GenericContainer(
      modelMapper.toXmlLayer( dbList ));
      return result;
      }

      This line compiles fine with 8u11 and produces the error message below in 8u20 b23
      SoftDelete is an interface defined as:

      public interface SoftDelete {
      public boolean isDeletedFlag();
      public void setDeletedFlag(boolean deletedFlag);
      }


      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Successful compile
      ACTUAL -
      Users/scott/dev/TestAutomationServer/TASWebService/src/main/java/ca/digitalrapids/tas/ws/TASWS.java:149: error: no suitable method found for collect(Collector<Object,CAP#1,List<Object>>)
      dbList = dbList.stream().filter( o-> !((SoftDelete)o).isDeletedFlag() ).collect( Collectors.toList());
      ^
          method Stream.<R#1>collect(Supplier<R#1>,BiConsumer<R#1,? super CAP#2>,BiConsumer<R#1,R#1>) is not applicable
            (cannot infer type-variable(s) R#1
              (actual and formal argument lists differ in length))
          method Stream.<R#2,A>collect(Collector<? super CAP#2,A,R#2>) is not applicable
            (cannot infer type-variable(s) R#2,A,CAP#3,T#2
              (argument mismatch; Collector<CAP#2,CAP#4,List<CAP#2>> cannot be converted to Collector<? super CAP#2,CAP#4,List<CAP#2>>))
        where R#1,T#1,R#2,A,T#2 are type-variables:
          R#1 extends Object declared in method <R#1>collect(Supplier<R#1>,BiConsumer<R#1,? super T#1>,BiConsumer<R#1,R#1>)
          T#1 extends Object declared in interface Stream
          R#2 extends Object declared in method <R#2,A>collect(Collector<? super T#1,A,R#2>)
          A extends Object declared in method <R#2,A>collect(Collector<? super T#1,A,R#2>)
          T#2 extends Object declared in method <T#2>toList()
        where CAP#1,CAP#2,CAP#3,CAP#4 are fresh type-variables:
          CAP#1 extends Object from capture of ?
          CAP#2 extends Object from capture of ?
          CAP#3 extends Object from capture of ?
          CAP#4 extends Object from capture of ?
      1 error
      :TASWebService:compileJava FAILED


      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      Users/scott/dev/TestAutomationServer/TASWebService/src/main/java/ca/digitalrapids/tas/ws/TASWS.java:149: error: no suitable method found for collect(Collector<Object,CAP#1,List<Object>>)
      dbList = dbList.stream().filter( o-> !((SoftDelete)o).isDeletedFlag() ).collect( Collectors.toList());
      ^
          method Stream.<R#1>collect(Supplier<R#1>,BiConsumer<R#1,? super CAP#2>,BiConsumer<R#1,R#1>) is not applicable
            (cannot infer type-variable(s) R#1
              (actual and formal argument lists differ in length))
          method Stream.<R#2,A>collect(Collector<? super CAP#2,A,R#2>) is not applicable
            (cannot infer type-variable(s) R#2,A,CAP#3,T#2
              (argument mismatch; Collector<CAP#2,CAP#4,List<CAP#2>> cannot be converted to Collector<? super CAP#2,CAP#4,List<CAP#2>>))
        where R#1,T#1,R#2,A,T#2 are type-variables:
          R#1 extends Object declared in method <R#1>collect(Supplier<R#1>,BiConsumer<R#1,? super T#1>,BiConsumer<R#1,R#1>)
          T#1 extends Object declared in interface Stream
          R#2 extends Object declared in method <R#2,A>collect(Collector<? super T#1,A,R#2>)
          A extends Object declared in method <R#2,A>collect(Collector<? super T#1,A,R#2>)
          T#2 extends Object declared in method <T#2>toList()
        where CAP#1,CAP#2,CAP#3,CAP#4 are fresh type-variables:
          CAP#1 extends Object from capture of ?
          CAP#2 extends Object from capture of ?
          CAP#3 extends Object from capture of ?
          CAP#4 extends Object from capture of ?
      1 error
      :TASWebService:compileJava FAILED

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------

      import java.util.*;
      import java.util.stream.Collectors;

      interface SoftDelete {
      public boolean isDeletedFlag();
      public void setDeletedFlag(boolean deletedFlag);
      }

      class A implements SoftDelete {
      private boolean deleted;
      public boolean isDeletedFlag() {
      return deleted;
      }
      public void setDeletedFlag(boolean deletedFlag) {
      this.deleted = deletedFlag;
      }
      }

      class B extends A {
      public String toString() { return "B";}
      }

      class C extends A {
      public String toString() { return "C";}
      }


      public class Test {
      public static void main(String [] args) throws RuntimeException {

      Class<? extends A> genericFindClass = null;
      if( args.length == 1) {
      genericFindClass = A.class;
      } else {
      genericFindClass = B.class;
      }

      if( genericFindClass != null ) {
      List<?> dbList = findStuff(genericFindClass);
      // Filter deleted elements if applicable
      if( SoftDelete.class.isAssignableFrom(genericFindClass) ) {
      dbList = dbList.stream().filter( o-> !((SoftDelete)o).isDeletedFlag() ).collect( Collectors.toList());
      }
      for (Object o : dbList) {
      System.out.println(o);
      }
      }
      }

      static List<?> findStuff(Class someType) {
      List list = new ArrayList();
      if (someType == B.class)
      list.add(new B());
      else if (someType == C.class)
      list.add(new C());
      return list;
      }
      }

      ---------- END SOURCE ----------

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              • Assignee:
                vromero Vicente Arturo Romero Zaldivar
                Reporter:
                webbuggrp Webbug Group
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                • Created:
                  Updated:
                  Resolved: