[Java] Fix import mapping for arrays with reference items of type string (#7182)

* fixed import mapping for arrays with component of type string

* changed test title

* generated samples

* Revert "generated samples"

This reverts commit b86a6fc.

Author: ioannisioannou16

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java

@@ -774,7 +774,7 @@ public String toModelFilename(String name) {
 
     @Override
     public String getTypeDeclaration(Schema p) {
-        Schema<?> schema = ModelUtils.unaliasSchema(this.openAPI, p);
+        Schema<?> schema = ModelUtils.unaliasSchema(this.openAPI, p, importMapping);
         Schema<?> target = ModelUtils.isGenerateAliasAsModel() ? p : schema;
         if (ModelUtils.isArraySchema(target)) {
             Schema<?> items = getSchemaItems((ArraySchema) schema);

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

@@ -20,11 +20,6 @@
 import io.swagger.v3.oas.models.Components;
 import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.media.*;
-
-import java.time.LocalDate;
-import java.time.ZoneId;
-import java.time.format.DateTimeFormatter;
-import java.util.Date;
 import org.openapitools.codegen.CodegenConstants;
 import org.openapitools.codegen.CodegenModel;
 import org.openapitools.codegen.CodegenType;
@@ -35,6 +30,9 @@
 import org.testng.annotations.Test;
 
 import java.io.File;
+import java.time.LocalDate;
+import java.time.ZoneId;
+import java.util.Date;
 
 public class AbstractJavaCodegenTest {
 
@@ -452,6 +450,16 @@ public void toDefaultValueTest() {
         Assert.assertEquals(defaultLocalDate, LocalDate.parse(defaultValue));
     }
 
+    @Test
+    public void getTypeDeclarationGivenImportMappingTest() {
+        final P_AbstractJavaCodegen codegen = new P_AbstractJavaCodegen();
+        codegen.importMapping().put("MyStringType", "com.example.foo");
+        codegen.setOpenAPI(new OpenAPI().components(new Components().addSchemas("MyStringType", new StringSchema())));
+        Schema<?> schema = new ArraySchema().items(new Schema().$ref("#/components/schemas/MyStringType"));
+        String defaultValue = codegen.getTypeDeclaration(schema);
+        Assert.assertEquals(defaultValue, "List<com.example.foo>");
+    }
+
     @Test
     public void getTypeDeclarationTest() {
         final P_AbstractJavaCodegen codegen = new P_AbstractJavaCodegen();