Description Mihhail Verhovtsov 2010-10-15 08:31:06 EDT

Build Identifier: 20100617-1415

Using Java 1.6.

Suppose class A implements interface SomeInterface:

A.java:

package org.example;
public class A implements SomeInterface {
   public String someMethod() { return "test someMethod"; }
}

SomeInterface.java:

package org.example;
public interface SomeInterface {
  public String someMethod();
}

Compile it with javac and make a jar of it:
javac org/example/A.java
jar -cf testjar.jar org/example/*.class

Now create a new Java project in Eclipse, create "lib" folder in it, copy testjar.jar into it. Go to Project options -> Java Build Path -> Libraries -> Add JARs and add testjar.jar.

Now we create the same interface in our project, but with more methods:

SomeInterface.java:

package org.example;
public interface SomeInterface {
   public String someMethod();
   public String someOtherMethod();
}

Now create empty class B, which extends A:

SomeInterface.java:

package org.example;
public class B extends A {
}

Eclipse compiles it without problems. Method someMethod() is usable. 

Sun's javac doesn't compile that code.

Reproducible: Always

Steps to Reproduce:
See above