@ExtensionMethod fails on Eclipse Oxygen if there is more than 1 parameter

[Kilrath]

Following simple example fails with an ArrayIndexOutOfBoundsException due to compiling with Eclipse Oxygen (jdk 1.8+):

public class A {
public static Object test(Object object, Object returnThis) {
return returnThis;
}
}

@ExtensionMethod(A.class)
class B {
public Object testExtensionMethod(Object object) {
return object.test(new Object());
}
}

Exception
Internal compiler error:
java.lang.ArrayIndexOutOfBoundsException

In Eclipse Neon it works!

[datomesan]

I have the same problem and Eclipse show that error
Internal compiler error: java.lang.ArrayIndexOutOfBoundsException: 1 at org.eclipse.jdt.internal.compiler.ast.MessageSend.analyseCode(MessageSend.java:182)

[janaroj]

Having the same issue with Eclipse Oxygen:
java.lang.ArrayIndexOutOfBoundsException: 1
at org.eclipse.jdt.internal.compiler.ast.MessageSend.analyseCode(MessageSend.java:182)

[mad-pojo]

I make a correction: @ExtensionMethod fails if there are exactly 2 parameters.
Workaround: in the preferences "Java / Compiler / Errors/Warnings" switch the options "Unlikely argument type for collection methods using 'Object'" and "Unlikely argument type for method equals()" to "Ignore".
This feature will be ignored.