How to create instance of org.springframework.dao.DataAccessException?

DataAccessException is an abstract class and can not be instantiated. Instead use one of the concrete classes such as new DataRetreivalFailureException("this was the reason") or create your own:

throw new DataAccessException("this was the reason") {};

And you get an anonymous class derived from the DataAccessException.

Why?

Simply because DataAccessException is abstract class. You cannot instantiate an abstract class.

What can I do?

If you check the hierarchy:

extended by java.lang.RuntimeException              extended by org.springframework.core.NestedRuntimeException                  extended by org.springframework.dao.DataAccessException

Since NestedRuntimeException is also abstract, you can throw a new RuntimeException(msg);(which is not recommended). You can go for what the other answer suggests - Use one of the concrete classes.

If you looking into source code, you will notice it's an abstract class, look into that:

package org.springframework.dao;import org.springframework.core.NestedRuntimeException;public abstract class DataAccessException extends NestedRuntimeException {    public DataAccessException(String msg) {        super(msg);    }    public DataAccessException(String msg, Throwable cause) {        super(msg, cause);    }}

And as you know abstract classes can not be extended...

But you can use it in other ways, this is one way to use it for example:

public interface ApiService {    Whatever getSomething(Map<String, String> Maps) throws DataAccessException;}