*** get started 1.

public class ConvertersExt extends Converters {

    @Override
    public void addConverters() {
        map.put(NotificationType.class, NotificationType::valueOf);
        map.put(ProviderType.class, ProviderType::valueOf);
        map.put(CommandType.class, CommandType::valueOf);
    }
}

@ComponentScan(basePackages = {"by.nhorushko.filterspecification"})

Symbol	Operation	Example filter query param
eq	Equals	city=eq#Sydney
neq	Not Equals	country=neq#uk
gt	Greater Than	amount=gt#10000
gte	Greater Than or equals to	amount=gte#10000
lt	Less Than	amount=lt#10000
lte	Less Than or equals to	amount=lte#10000
in	IN	country=in#uk, usa, au
nin	Not IN	country=nin#fr, de, nz
btn	Between	joiningDate=btn#2018-01-01, 2016-01-01
like	Like	firstName=like#John
en	equalsNull	firstName=en#null
nn	not null	firstName=nn#null

Подключение библиотеки:

        <repository>
            <id>jitpack.io</id>
            <url>https://jitpack.io</url>
        </repository>

       <dependency>
            <groupId>com.github.NikolayNN</groupId>
            <artifactId>filter-specifications-lib</artifactId>
            <version>2.0</version>
        </dependency>