fix missing import and fix missing table name

Author: lilliCao

cobigen-templates/templates-devon4j/src/main/java/com/devonfw/cobigen/templates/devon4j/utils/JavaUtil.java

@@ -3,10 +3,20 @@
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
+import java.lang.reflect.ParameterizedType;
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
+import java.util.List;
 import java.util.Map;
+import java.util.Optional;
+
+import javax.persistence.Column;
+import javax.persistence.Id;
+import javax.persistence.Table;
 
 import org.apache.commons.lang3.ClassUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -496,13 +506,16 @@ public String getFirstEnumValue(String className) {
      *
      * @param className
      *            full qualified class name
-     * @return the annotated table name if existed or null
+     * @return the annotated table name if existed or class name without the word Entity
      */
     public String getEntityTableName(String className) {
         try {
             Class<?> entityClass = Class.forName(className);
             Table table = entityClass.getAnnotation(Table.class);
-            return table.name();
+            return table == null
+                ? StringUtils.left(entityClass.getSimpleName(),
+                    entityClass.getSimpleName().length() - "Entity".length())
+                : table.name();
         } catch (ClassNotFoundException e) {
             LOG.error("{}: Could not find {}", e.getMessage(), className);
             return null;