[plugin-maven] `eclipse` formatter sorts Java class members and imports lexicographically rather than alphabetically

[stechio]

Contrary to the formatter within the Eclipse IDE (which sorts Java class members and imports alphabetically), the eclipse formatter within Spotless sorts Java class members and imports lexicographically (!?!) — here it is my configuration:

<eclipse>
  <file>${project.basedir}/config/eclipse/java-style.xml</file>

  <sortMembersEnabled>true</sortMembersEnabled>

  <!-- Optional: Specify the sort order of the member categories. (default: T,SF,SI,SM,F,I,C,M)
    SF,SI,SM,F,I,C,M,T = Static Fields, Static Initializers, Static Methods, Fields, Initializers, Constructors, Methods, (Nested) Types -->
  <sortMembersOrder>T,SF,SI,SM,F,I,C,M</sortMembersOrder>

  <sortMembersVisibilityOrderEnabled>true</sortMembersVisibilityOrderEnabled>

  <!-- Optional: Specify the ordering of members of the same category by the visibility within the category (default: B,V,R,D).
    B,R,D,V = Public, Protected, Package, Private -->
  <sortMembersVisibilityOrder>B,R,D,V</sortMembersVisibilityOrder>
</eclipse>

Feeding Eclipse IDE-formatted source code to spotless-maven-plugin, the resulting source code differs just in its sorting — for example:

• Eclipse IDE:

public static Optional<StackFrame> callerFrame() {
  . . .
}

public static Object callOrThrow(. . .) {
  . . .
}

• Spotless:

public static Object callOrThrow(. . .) {
  . . .
}

public static Optional<StackFrame> callerFrame() {
  . . .
}

In case of homonymous methods, lexicographic sorting is applied to the parameter type names:

• Eclipse IDE:

public static String transform(char[] value) {
  . . .
}

public static String transform(String value) {
  . . .
}

• Spotless:

public static String transform(String value) {
  . . .
}

public static String transform(char[] value) {
  . . .
}

The imports are also affected by the same problem:

• Eclipse IDE:

import static org.myexample.util.MyClass.anotherFunction;
import static org.myexample.util.MyClass.NestedType.myFunction;

• Spotless:

import static org.myexample.util.MyClass.NestedType.myFunction;
import static org.myexample.util.MyClass.anotherFunction;

Why such an inconsistency, considering that both the formatters are based on JDT?
(Have I overlooked any configuration option?)

[aKandzior]

I commited a pull request to fix this issue, see: Use Collator when sorting Eclipse JDT members