odrotbohm

Keybase proof

I hereby claim:

• I am odrotbohm on github.
• I am odrotbohm (https://keybase.io/odrotbohm) on keybase.
• I have a public key ASBAoaL1ovuekChAwlljeBmx1owaUCg5zwckYgcSGiGeAQo

To claim this, I am signing this object:

odrotbohm

@Component
public class MockPostProcessor implements BeanPostProcessor {

	/* 
	 * (non-Javadoc)
	 * @see org.springframework.beans.factory.config.BeanPostProcessor#postProcessAfterInitialization(java.lang.Object, java.lang.String)
	 */
	@Override
	public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {

odrotbohm

public class Sample {

	public static void main(String[] args) {

		Foo<? extends Bar<?>> foo = new Foo<>();

		// Compiles
		Iterable<?> first = foo.someMethod();
		DedicatedWrapper<? extends Bar<?>> dedicatedWrapper = foo.someOtherMethod();

odrotbohm

Using annotation based null checks in Eclipse

Found issues

Calls to remote API not using nullability annotations cause warnings

Assume you call some external API (e.g. JDK API) that doesn’t use the nullability annotations:

odrotbohm

public class LambdaTypeDetectionSample {

	public static void main(String[] args) {

		Function<Integer, String> lambdaFunction = i -> i.toString();
		Function<Integer, String> oldschoolFunction = new Function<Integer, String>() {

			public String apply(Integer t) {
				return t.toString();
			}

odrotbohm

odrotbohm

package org.sample;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.TimeZone;

import org.openjdk.jmh.annotations.Benchmark;

odrotbohm

/*
 * Copyright 2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software

odrotbohm

public class AmbiguitySample {

  /**
   * This compiles when using a JDK 8 with target JDK 6 but fails when the target is JDK 8.
   */
	public static void main(String[] args) {

		CriteriaBuilder builder;
		Expression<Object> objectExpression;
		Expression<Collection<Object>> collectionOfObjectExpression;

odrotbohm

@RequiredArgsConstructor
public class ViewModel {
  
  private final @NonNull YourService service;
  
  public boolean yourDescriptiveMethod() {
    return service.someMethod()
  }
  
  // … more methods