# java.util.spi

***

**1. Loading a custom Service Provider for `java.util.logging.Logger`:**

```java
import java.util.logging.Logger;
import java.util.logging.ServiceLoader;

public class CustomLogger {

    public static void main(String[] args) {
        // Load the custom logger service provider
        ServiceLoader<Logger> loggerLoader = ServiceLoader.load(Logger.class);
        
        // Iterate over the available providers and print their names
        for (Logger logger : loggerLoader) {
            System.out.println("Provider: " + logger.getClass().getName());
        }
    }
}
```

**2. Creating a custom Service Provider for a new `java.lang.annotation.Annotation` interface:**

```java
import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.ServiceLoader;

// Custom annotation interface
@Retention(RetentionPolicy.RUNTIME)
@interface MyAnnotation {
    String value();
}

// Custom service provider class
public class MyAnnotationProvider implements ServiceLoader.Provider<MyAnnotation> {
    @Override
    public MyAnnotation get() {
        return new MyAnnotation() {
            @Override
            public String value() {
                return "Custom annotation value";
            }
        };
    }
}
```

**3. Using a custom Service Provider for `java.nio.charset.Charset`:**

```java
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.ServiceLoader;

public class CustomCharset {

    public static void main(String[] args) {
        // Load the custom charset service provider
        ServiceLoader<Charset> charsetLoader = ServiceLoader.load(Charset.class);
        
        // Iterate over the available providers and print their names
        for (Charset charset : charsetLoader) {
            if (!charset.equals(StandardCharsets.UTF_8)) {
                System.out.println("Provider: " + charset.name());
            }
        }
    }
}
```

**4. Creating a custom Service Provider for `java.net.URLStreamHandlerFactory`:**

```java
import java.net.URL;
import java.net.URLStreamHandler;
import java.net.URLStreamHandlerFactory;
import java.util.ServiceLoader;

public class CustomURLStreamHandlerFactory implements URLStreamHandlerFactory {

    @Override
    public URLStreamHandler createURLStreamHandler(String protocol) {
        if (protocol.equals("custom")) {
            return new CustomURLStreamHandler();
        }
        return null;
    }

    // Custom URL stream handler
    private class CustomURLStreamHandler extends URLStreamHandler {
        // Custom URL stream handling logic
    }
}
```

**5. Using a custom Service Provider for `java.security.KeyManagerFactory`:**

```java
import java.security.KeyManagerFactory;
import java.security.Provider;
import java.security.Security;
import java.util.ServiceLoader;

public class CustomKeyManagerFactory {

    public static void main(String[] args) {
        // Load the custom key manager factory service provider
        ServiceLoader<KeyManagerFactory> keyManagerFactoryLoader = ServiceLoader.load(KeyManagerFactory.class);
        
        // Iterate over the available providers and print their names
        for (KeyManagerFactory keyManagerFactory : keyManagerFactoryLoader) {
            System.out.println("Provider: " + keyManagerFactory.getProvider().getName());
        }
    }
}
```

**6. Creating a custom Service Provider for `java.security.AlgorithmParameters`:**

```java
import java.security.AlgorithmParameters;
import java.security.Provider;
import java.security.Security;
import java.util.ServiceLoader;

public class CustomAlgorithmParameters {

    public static void main(String[] args) {
        // Load the custom algorithm parameters service provider
        ServiceLoader<AlgorithmParameters> algorithmParametersLoader = ServiceLoader.load(AlgorithmParameters.class);
        
        // Iterate over the available providers and print their names
        for (AlgorithmParameters algorithmParameters : algorithmParametersLoader) {
            System.out.println("Provider: " + algorithmParameters.getProvider().getName());
        }
    }
}
```

**7. Using a custom Service Provider for `javax.naming.spi.ObjectFactory`:**

```java
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.naming.spi.ObjectFactory;
import java.util.ServiceLoader;

public class CustomObjectFactory {

    public static void main(String[] args) throws NamingException {
        // Load the custom object factory service provider
        ServiceLoader<ObjectFactory> objectFactoryLoader = ServiceLoader.load(ObjectFactory.class);
        
        // Lookup the object using the custom object factory
        Context ctx = new InitialContext();
        Object obj = ctx.lookup("java:comp/env/customObject");
        
        // Print the object details
        System.out.println("Object: " + obj);
    }
}
```

**8. Creating a custom Service Provider for `javax.mail.Provider`:**

```java
import javax.mail.Provider;
import javax.mail.Session;
import javax.mail.Transport;
import java.util.ServiceLoader;

public class CustomMailProvider implements Provider {

    @Override
    public String getType() {
        return "mail";
    }

    @Override
    public String getProtocol() {
        return "custom";
    }

    @Override
    public String getDescription() {
        return "Custom mail provider";
    }

    @Override
    public Transport getTransport(Session session) {
        return new CustomMailTransport();
    }

    // Custom mail transport implementation
    private class CustomMailTransport {}
}
```

**9. Using a custom Service Provider for `org.xml.sax.EntityResolver`:**

```java
import org.xml.sax.EntityResolver;
import org.xml.sax.SAXException;
import java.util.ServiceLoader;

public class CustomEntityResolver implements EntityResolver {

    @Override
    public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
        // Custom entity resolution logic
    }
}
```

**10. Creating a custom Service Provider for `com.google.protobuf.ExtensionRegistryFactory`:**

```java
import com.google.protobuf.ExtensionRegistry;
import com.google.protobuf.ExtensionRegistryFactory;
import java.util.ServiceLoader;

public class CustomExtensionRegistryFactory implements ExtensionRegistryFactory {

    @Override
    public ExtensionRegistry create() {
        // Custom extension registry implementation
    }
}
```

**11. Using a custom Service Provider for `com.sun.jdi.VirtualMachineManager`:**

```java
import com.sun.jdi.connect.Connector;
import com.sun.jdi.connect.spi.TransportService;
import com.sun.jdi.spi.VirtualMachineManager;
import java.util.ServiceLoader;

public class CustomTransportService implements TransportService {

    @Override
    public Object attach(Connector connector) {
        // Custom attachment logic
    }
}
```

**12. Creating a custom Service Provider for `org.eclipse.jetty.websocket.api.WebSocketPolicy`:**

```java
import org.eclipse.jetty.websocket.api.WebSocketPolicy;
import org.eclipse.jetty.websocket.api.WebSocketPolicy.Expansion;
import org.eclipse.jetty.websocket.api.WebSocketPolicy.HeaderValue;
import org.eclipse.jetty.websocket.api.WebSocketPolicy.Security;
import java.util.ServiceLoader;

public class CustomWebSocketPolicy implements WebSocketPolicy {

    @Override
    public long getIdleTimeout() {
        return 60000;
    }

    @Override
    public Expansion getAllowExtensions() {
        return Expansion.Relaxed;
    }

    @Override
    public Expansion getAllowOrigins() {
        return Expansion.Strict;
    }

    @Override
    public HeaderValue getHeaderValues(String name) {
        return HeaderValue.PermitAny;
    }

    @Override
    public Security getSecurity() {
        return Security.RFC6455;
    }
}
```

**13. Using a custom Service Provider for `javax.security.auth.login.Configuration`:**

```java
import javax.security.auth.login.Configuration;
import java.util.ServiceLoader;

public class CustomLoginConfiguration implements Configuration {

    @Override
    public AppConfigurationEntry[] getAppConfigurationEntry(String name) {
        // Custom login configuration logic
    }
}

```