[JAVA] incorrect import mapping of DateTime

Description

Generation of java components fails when joda is not used due to incorrect mapping of imports

openapi-generator version

3.3.2-SNAPSHOT

OpenAPI declaration file content or url

---
components:
  schemas:
    Dummy:
      type: object
      properties:
        dt:
          type: date
        ts:
          type: date-time

Command line used for generation

Steps to reproduce

Generate with any Java generator with dateLibrary other then joda

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/pull/1313

Suggest a fix/enhancement

diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java
index c119400db..15458ccb7 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java
@@ -486,7 +486,7 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
             typeMapping.put("date", "LocalDate");
             typeMapping.put("DateTime", "OffsetDateTime");
             importMapping.put("LocalDate", "org.threeten.bp.LocalDate");
-            importMapping.put("OffsetDateTime", "org.threeten.bp.OffsetDateTime");
+            importMapping.put("DateTime", "org.threeten.bp.OffsetDateTime");
         } else if ("joda".equals(dateLibrary)) {
             additionalProperties.put("joda", "true");
             typeMapping.put("date", "LocalDate");
@@ -500,10 +500,10 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
             importMapping.put("LocalDate", "java.time.LocalDate");
             if ("java8-localdatetime".equals(dateLibrary)) {
                 typeMapping.put("DateTime", "LocalDateTime");
-                importMapping.put("LocalDateTime", "java.time.LocalDateTime");
+                importMapping.put("DateTime", "java.time.LocalDateTime");
             } else {
                 typeMapping.put("DateTime", "OffsetDateTime");
-                importMapping.put("OffsetDateTime", "java.time.OffsetDateTime");
+                importMapping.put("DateTime", "java.time.OffsetDateTime");
             }
         } else if (dateLibrary.equals("legacy")) {
             additionalProperties.put("legacyDates", "true");

Start in modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java and review the dateLibrary type and import mappings. Reproduce generation with the provided schema using a non-joda Java date library, then verify that generated components use valid imports for date and date-time types across the affected libraries.