MyTypeLiteralTest.java

import org.glassfish.jersey.internal.util.collection.Ref;
import org.junit.Test;

import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;

@SuppressWarnings("unused")
abstract class MyTypeLiteral<T> {

  Type getType() {
    ParameterizedType paramterizeType = (ParameterizedType) this.getClass().getGenericSuperclass();
    return paramterizeType.getActualTypeArguments()[0];
  }

}

public class MyTypeLiteralTest {

  @Test
  public void testGetType() throws Exception {
    Type type = (new MyTypeLiteral<Ref<HttpServletRequest>>() {
    }).getType();

    assertThat(type, instanceOf(ParameterizedType.class));
    ParameterizedType parameterizedType = (ParameterizedType) type;

    assertThat(parameterizedType.getTypeName(),
        is("org.glassfish.jersey.internal.util.collection.Ref<javax.servlet.http.HttpServletRequest>"));

    assertThat(parameterizedType.getOwnerType(), is(nullValue()));
    assertThat(parameterizedType.getRawType(), is((Type) Ref.class));

    Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
    assertThat(actualTypeArguments.length, is(1));
    assertThat(actualTypeArguments[0], is((Type) HttpServletRequest.class));
  }

}