SSL enable for api in java on port 8443

On my server I have SSL enabled for 8443 but its on working for apis. It is showing this message.
SSL Error: Unable to verify the first certificate
You can try https://sabkiapp.com:8443/api/contactus or http://sabkiapp.com:8080/api/contactus
method post

{
"app_code":"app_0002",

"token":"eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.eyJhdWQiOiIxIiwianRpIjoiNTNlZjhjOTU4MTdlYmU1Y2M3MjVkNmFkZGQ5YjFkZmUwOTdiY2Q1OTQyOGJhYWE3Mjg4NmJiZDgxMzI3YWExNGQ0YTMyNmY3OWM1Y2FiMjciLCJpYXQiOjE2Mzk2NjAzMTEsIm5iZiI6MTYzOTY2MDMxMSwiZXhwIjoxNjcxMTk2MzExLCJzdWIiOiIxMDAwMDAwMSIsInNjb3BlcyI6W119.XqBVvBJRyFZmQ8E1-F1O5D0qPH_T7F0sQSDK6wI16VOJcRNJ1uOfXe-SbA6JhfVwuY0QzLl4D2-oSZUBnHTRucWJfhBmYJ0F1ZERD6l-8hS_o2FwSV7CNeXi-IlXiT_fxXzCOEdulXzy0T2sDxtciMHFstqmzURLGNztymyBBRdy4tl2zsII5hvVj5s3cW0c5_1gYmIRqzLoljIca9oOBFk-0UmrYyYWgGp4bN-kLGkqEmDWcQ4lXnpLaE1UtttcIVJuZhFQdT69ciXL5Sj1GDZyxkF6uQZQ-K9P5ePE4o2DLMp0AxzEPlRWV5JpYM87TghxsaMdaDNszUifXS6MGivVloqdK8yc01bWTJVIW5fjlP7r2q7It1Zr7wUiN3BszgXXlmdhh0egNdqbC-8iAwOqsd2zF51oEREoAT2npXI6o7r9N0NQcr4K251rXWWUm2O_QtmdK7aXRyMny1uYi_aLGrfc5qbMm62Ntw8o4X63gdk3aIyQVQHinOs0UaE0pXw4Bqk01YoZDTRmhpZBvnRZSYdmnXzw4bOeD7HRwJBjcljU9DitdP53g6bPl2aR-hUCIS8gjXZNWJev1cxxTQDJkcfU1_N57W1YmM5BySTN3bOdhD6DqWtxZapmfGUTgxj1IBO5qPgEsA5iNuOtRnVmlnXFs14hiNZyC62w_Ys",

"userid":"10000001",
"channel_id":"app_0001",
"page_no":"1"
}