EMF, the single underscore, and newer versions of Java.

[threadedblue]

I am looking for a workaround.

I have a large code base that I generate with EMF. Years ago I found it would not compile with versions of Java after 8. I have been using 8 ever since. But it would be good to be able to move on to new Java.
EMF is generating code that has a single underscore as a variable name. The situation occurs mostly in the generation of enums. I can find nothing in the xsd that I am using. It appears to be an EMF thing.

Generated code snippet:
`public enum FilterOperatorEnum implements Enumerator {
/**
* The '' literal object.
*
*
*
* Equals
*
* @see #__VALUE
* @generated
* @ordered
*/
(0, "", "="), // This happens all the time.

`

My original xsd simpletype:
What in here is provoking the single underscore?

''' <xs:simpleType name="FilterOperatorEnum">
<xs:restriction base="code-primitive">
<xs:enumeration value="=">
xs:annotation
<xs:documentation xml:lang="en">Equals</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="is-a">
xs:annotation
<xs:documentation xml:lang="en">Is A (by subsumption)</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="descendent-of">
xs:annotation
<xs:documentation xml:lang="en">Descendent Of (by subsumption)</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="is-not-a">
xs:annotation
<xs:documentation xml:lang="en">Not (Is A) (by subsumption)</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="regex">
xs:annotation
<xs:documentation xml:lang="en">Regular Expression</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="in">
xs:annotation
<xs:documentation xml:lang="en">In Set</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="not-in">
xs:annotation
<xs:documentation xml:lang="en">Not in Set</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="generalizes">
xs:annotation
<xs:documentation xml:lang="en">Generalizes (by Subsumption)</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="exists">
xs:annotation
<xs:documentation xml:lang="en">Exists</xs:documentation>
</xs:annotation>
</xs:enumeration>
</xs:restriction>
</xs:simpleType>
'''

``

[merks]

When trying to form an identifier from the value <xs:enumeration value="="> the characters that are not a valid identifier character are dropped leaving nothing.

You can set the compliance level to what you are actually targeting to avoid the problem.

Better would be to add xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" to the root of the scheme and use an <xs:enumeration ecore:name="equals" value="="> to assign a meaningful name...