Stuck on an issue?

Expected Behavior

pass my test，spring-boot 2.1.9 project only can used chaos-monkey-spring-boot version is 2.0.0、2.0.1、2.0.2，can‘t used version is 2.1.1、2.2.0 and 2.3.0-SNAPSHOT.

Why support spring-boot 2.1.9 in 2.0.2 after version ?

Current Behavior

when i used 2.1.1 and after version， will thrown exception

2020-06-10 11:13:41.594 ERROR [test-project,main,] Error starting Tomcat context. Exception: org.springframework.beans.factory.BeanCreationException. Message: Error creating bean with name 'servletEndpointRegistrar' defined in class path resource [org/springframework/boot/actuate/autoconfigure/endpoint/web/ServletEndpointManagementContextConfiguration$WebMvcServletEndpointManagementContextConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.endpoint.web.ServletEndpointRegistrar]: Factory method 'servletEndpointRegistrar' threw exception; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'chaosMonkeyRestEndpoint' defined in class path resource [de/codecentric/spring/boot/chaos/monkey/configuration/ChaosMonkeyConfiguration.class]: Unsatisfied dependency expressed through method 'chaosMonkeyRestEndpoint' parameter 1; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'scheduler' defined in class path resource [de/codecentric/spring/boot/chaos/monkey/configuration/ChaosMonkeyConfiguration.class]: Unsatisfied dependency expressed through method 'scheduler' parameter 0; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'org.springframework.scheduling.TaskScheduler' available: expected single matching bean but found 2: taskScheduler,catalogWatchTaskScheduler
2020-06-10 11:13:41.632  INFO [test-project,main,] Stopping service [Tomcat]
2020-06-10 11:13:41.650  WARN [test-project,main,] The web application [ROOT] appears to have started a thread named [AsyncReporter{KafkaSender{bootstrapServers=10.1.41.126:9092, topic=zipkin}}] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 sun.misc.Unsafe.park(Native Method)
 java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
 java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
 zipkin2.reporter.ByteBoundedQueue.drainTo(ByteBoundedQueue.java:81)
 zipkin2.reporter.AsyncReporter$BoundedAsyncReporter.flush(AsyncReporter.java:257)
 zipkin2.reporter.AsyncReporter$Builder$1.run(AsyncReporter.java:190)
2020-06-10 11:13:41.650  WARN [test-project,main,] The web application [ROOT] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 java.lang.Object.wait(Native Method)
 java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)
 com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)
2020-06-10 11:13:41.653  WARN [test-project,main,] Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
2020-06-10 11:13:42.501  INFO [test-project,AsyncReporter{KafkaSender{bootstrapServers=10.1.41.126:9092, topic=zipkin}},] ProducerConfig values: 
	acks = 0
	batch.size = 16384
	bootstrap.servers = [10.1.41.126:9092]
	buffer.memory = 33554432
	client.id = 
	compression.type = none
	connections.max.idle.ms = 540000
	enable.idempotence = false
	interceptor.classes = []
	key.serializer = class org.apache.kafka.common.serialization.ByteArraySerializer
	linger.ms = 0
	max.block.ms = 60000
	max.in.flight.requests.per.connection = 5
	max.request.size = 1048576
	metadata.max.age.ms = 300000
	metric.reporters = []
	metrics.num.samples = 2
	metrics.recording.level = INFO
	metrics.sample.window.ms = 30000
	partitioner.class = class org.apache.kafka.clients.producer.internals.DefaultPartitioner
	receive.buffer.bytes = 32768
	reconnect.backoff.max.ms = 1000
	reconnect.backoff.ms = 50
	request.timeout.ms = 30000
	retries = 0
	retry.backoff.ms = 100
	sasl.client.callback.handler.class = null
	sasl.jaas.config = null
	sasl.kerberos.kinit.cmd = /usr/bin/kinit
	sasl.kerberos.min.time.before.relogin = 60000
	sasl.kerberos.service.name = null
	sasl.kerberos.ticket.renew.jitter = 0.05
	sasl.kerberos.ticket.renew.window.factor = 0.8
	sasl.login.callback.handler.class = null
	sasl.login.class = null
	sasl.login.refresh.buffer.seconds = 300
	sasl.login.refresh.min.period.seconds = 60
	sasl.login.refresh.window.factor = 0.8
	sasl.login.refresh.window.jitter = 0.05
	sasl.mechanism = GSSAPI
	security.protocol = PLAINTEXT
	send.buffer.bytes = 131072
	ssl.cipher.suites = null
	ssl.enabled.protocols = [TLSv1.2, TLSv1.1, TLSv1]
	ssl.endpoint.identification.algorithm = https
	ssl.key.password = null
	ssl.keymanager.algorithm = SunX509
	ssl.keystore.location = null
	ssl.keystore.password = null
	ssl.keystore.type = JKS
	ssl.protocol = TLS
	ssl.provider = null
	ssl.secure.random.implementation = null
	ssl.trustmanager.algorithm = PKIX
	ssl.truststore.location = null
	ssl.truststore.password = null
	ssl.truststore.type = JKS
	transaction.timeout.ms = 60000
	transactional.id = null
	value.serializer = class org.apache.kafka.common.serialization.ByteArraySerializer

2020-06-10 11:13:42.505  INFO [test-project,AsyncReporter{KafkaSender{bootstrapServers=10.1.41.126:9092, topic=zipkin}},] Kafka version : 2.0.1
2020-06-10 11:13:42.506  INFO [test-project,AsyncReporter{KafkaSender{bootstrapServers=10.1.41.126:9092, topic=zipkin}},] Kafka commitId : fa14705e51bd2ce5
2020-06-10 11:13:42.518  INFO [test-project,kafka-producer-network-thread | producer-1,] Cluster ID: nvkI2fgER1CCkbc3dB2DTQ
2020-06-10 11:13:42.528  INFO [test-project,main,] [Producer clientId=producer-1] Closing the Kafka producer with timeoutMillis = 9223372036854775807 ms.
2020-06-10 11:13:42.554  INFO [test-project,main,] 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-06-10 11:13:42.566 ERROR [test-project,main,] 

***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 0 of method scheduler in de.codecentric.spring.boot.chaos.monkey.configuration.ChaosMonkeyConfiguration required a single bean, but 2 were found:
	- taskScheduler: defined by method 'taskScheduler' in class path resource [org/springframework/boot/autoconfigure/task/TaskSchedulingAutoConfiguration.class]
	- catalogWatchTaskScheduler: defined by method 'catalogWatchTaskScheduler' in class path resource [org/springframework/cloud/consul/discovery/ConsulDiscoveryClientConfiguration.class]


Action:

Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed

Disconnected from the target VM, address: '127.0.0.1:58284', transport: 'socket'

Process finished with exit code 1

Possible Solution

i seed source code in ChaosMonkeyConfiguration.class

  @Bean
  public ChaosMonkeyScheduler scheduler(
      @Nullable TaskScheduler scheduler, ChaosMonkeyRuntimeScope runtimeScope) {
    ScheduledTaskRegistrar registrar = null;
    if (scheduler != null) {
      registrar = new ScheduledTaskRegistrar();
      registrar.setTaskScheduler(scheduler);
    }
    return new ChaosMonkeyScheduler(registrar, assaultProperties, runtimeScope);
  }

in this code, this statement of method , is compatible scheduler parameter is null，why add @Nullable annotation。

Steps to Reproduce

1. add pom.xml dependency。

        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>chaos-monkey-spring-boot</artifactId>
            <version>2.3.0-SNAPSHOT</version>
        </dependency>

2. add program run parameter

--spring.profiles.active=chaos-monkey

3. start project

Context (Environment)

os: macOS 10.15.3 JDK: 1.8.0_231-b11 spring-boot: 2.1.9 spring-cloud : 2.1.0