revert a java change

Author: devhl-labs

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/AbstractJavaCodegenTest.java

@@ -970,6 +970,6 @@ public void testGeneratedExampleValues() {
         final OpenAPI openAPI = FLATTENED_SPEC.get("3_0/spring/date-time-parameter-types-for-testing");
         codegen.setOpenAPI(openAPI);
         DateSchema dateSchema = (DateSchema) openAPI.getPaths().get("/thingy/{date}").getPost().getParameters().get(0).getSchema();
-        Assert.assertTrue(codegen.escapeQuotationMark(codegen.toExampleValue(dateSchema)).matches("2020-12-31")); // TODO: the correct value is 2021-01-01. There appears to be a bug in converting the example string to a date
+        Assert.assertTrue(codegen.escapeQuotationMark(codegen.toExampleValue(dateSchema)).matches("2021-01-01"));
     }
 }