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  1. JDK
  2. JDK-8261457

test/langtools/tools/javac/T8187978 can fail if ArrayList class is modified

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    • Bug
    • Resolution: Fixed
    • P3
    • 17
    • 17
    • tools
    • None
    • b12

    Description

      The test in test/langtools/tools/javac/T8187978 tests that javac emits proper diagnostics when overload method resolution fails for the code being compiled. It uses a reference file ("golden file") technique to verify correct operation.

      Unfortunately, the reference file includes information about actual methods in java.util.ArrayList, including the following:

      public boolean add(E)
      public void add(int, E)
      private void add(E, Object[], int)

      The first two methods are methods in the public API and are unlikely ever to change. However, the third method is a private method, and changing it causes the test to fail. This can be illustrated by applying this patch:

      diff --git a/src/java.base/share/classes/java/util/ArrayList.java b/src/java.base/share/classes/java/util/ArrayList.java
      index a36dcd8a796..8cac9e72afa 100644
      --- a/src/java.base/share/classes/java/util/ArrayList.java
      +++ b/src/java.base/share/classes/java/util/ArrayList.java
      @@ -449,7 +449,7 @@ public class ArrayList<E> extends AbstractList<E>
            * bytecode size under 35 (the -XX:MaxInlineSize default value),
            * which helps when add(E) is called in a C1-compiled loop.
            */
      - private void add(E e, Object[] elementData, int s) {
      + private void addx(E e, Object[] elementData, int s) {
               if (s == elementData.length)
                   elementData = grow();
               elementData[s] = e;
      @@ -464,7 +464,7 @@ public class ArrayList<E> extends AbstractList<E>
            */
           public boolean add(E e) {
               modCount++;
      - add(e, elementData, size);
      + addx(e, elementData, size);
               return true;
           }
       

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              asotona Adam Sotona
              smarks Stuart Marks
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                Updated:
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