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import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.*;

@Documented
@Constraint(validatedBy = ExampleConstraintValidator.class)
@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface ExampleConstraint {

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import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.util.concurrent.TimeUnit;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface DistributedLock {

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#!/bin/bash

export AWS_ACCESS_KEY_ID=...
export AWS_SECRET_ACCESS_KEY=...
export AWS_DEFAULT_REGION=...

PG_HOST=...
PG_USER=...
PG_PASS='...'
PG_DB=...

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siege -c50 -t5S -H 'Content-Type: application/json' -H 'access-token: ...' 'http://localhost:8080/... POST {"...": "...", ...}'

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import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.collections4.IteratorUtils;
import org.apache.commons.lang3.StringUtils;
import org.hibernate.query.criteria.internal.path.PluralAttributePath;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.repository.support.PageableExecutionUtils;

import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;

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spring.datasource.url=jdbc:hsqldb:mem:testdb;sql.syntax_pgs=true

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import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class ApplicationContextHolder implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

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package ...configuration;

import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Profile;
import org.springframework.scheduling.annotation.EnableAsync;

@Configuration
@EnableAsync
@Profile("!test")
public class AsyncConfiguration {

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# list Java processes
jcmd -l

# list running JVM's system properties or flags (select a 'pid' from above command's result list)
jcmd pid VM.system_properties
jcmd pid VM.flags

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kubectl rollout restart deployment name-of-my-deployment