Kafdrop is not connecting , 'zookeeper' on field 'connect': rejected value

[Awnish90]

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'curatorConnection' defined in file [D:\warkspace\Kartik_EMT\Kafdrop-master\target\classes\com\homeadvisor\kafdrop\config\CuratorConfiguration$CuratorHealthIndicator.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [org.apache.curator.framework.CuratorFramework]: Error creating bean with name 'curatorFramework' defined in class path resource [com/homeadvisor/kafdrop/config/CuratorConfiguration.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [com.homeadvisor.kafdrop.config.CuratorConfiguration$ZookeeperProperties]: Error creating bean with name 'curatorConfiguration.ZookeeperProperties': Could not bind properties to CuratorConfiguration.ZookeeperProperties (prefix=zookeeper, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is org.springframework.validation.BindException: org.springframework.boot.bind.RelaxedDataBinder$RelaxedBeanPropertyBindingResult: 1 errors
Field error in object 'zookeeper' on field 'connect': rejected value [null]; codes [NotBlank.zookeeper.connect,NotBlank.connect,NotBlank.java.lang.String,NotBlank]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [zookeeper.connect,connect]; arguments []; default message [connect]]; default message [may not be empty]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'curatorConfiguration.ZookeeperProperties': Could not bind properties to CuratorConfiguration.ZookeeperProperties (prefix=zookeeper, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is org.springframework.validation.BindException: org.springframework.boot.bind.RelaxedDataBinder$RelaxedBeanPropertyBindingResult: 1 errors
Field error in object 'zookeeper' on field 'connect': rejected value [null]; codes [NotBlank.zookeeper.connect,NotBlank.connect,NotBlank.java.lang.String,NotBlank]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [zookeeper.connect,connect]; arguments []; default message [connect]]; default message [may not be empty]; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'curatorFramework' defined in class path resource [com/homeadvisor/kafdrop/config/CuratorConfiguration.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [com.homeadvisor.kafdrop.config.CuratorConfiguration$ZookeeperProperties]: Error creating bean with name 'curatorConfiguration.ZookeeperProperties': Could not bind properties to CuratorConfiguration.ZookeeperProperties (prefix=zookeeper, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is org.springframework.validation.BindException: org.springframework.boot.bind.RelaxedDataBinder$RelaxedBeanPropertyBindingResult: 1 errors
Field error in object 'zookeeper' on field 'connect': rejected value [null]; codes [NotBlank.zookeeper.connect,NotBlank.connect,NotBlank.java.lang.String,NotBlank]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [zookeeper.connect,connect]; arguments []; default message [connect]]; default message [may not be empty]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'curatorConfiguration.ZookeeperProperties': Could not bind properties to CuratorConfiguration.ZookeeperProperties (prefix=zookeeper, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is org.springframework.validation.BindException: org.springframework.boot.bind.RelaxedDataBinder$RelaxedBeanPropertyBindingResult: 1 errors
Field error in object 'zookeeper' on field 'connect': rejected value [null]; codes [NotBlank.zookeeper.connect,NotBlank.connect,NotBlank.java.lang.String,NotBlank]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [zookeeper.connect,connect]; arguments []; default message [connect]]; default message [may not be empty]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1143)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1046)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:760)
at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:360)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:306)
at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:134)
at com.homeadvisor.kafdrop.KafDrop.main(KafDrop.java:54)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'curatorFramework' defined in class path resource [com/homeadvisor/kafdrop/config/CuratorConfiguration.class]: Unsatisfied dependency expressed through constructor argument with index 0 of type [com.homeadvisor.kafdrop.config.CuratorConfiguration$ZookeeperProperties]: Error creating bean with name 'curatorConfiguration.ZookeeperProperties': Could not bind properties to CuratorConfiguration.ZookeeperProperties (prefix=zookeeper, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is org.springframework.validation.BindException: org.springframework.boot.bind.RelaxedDataBinder$RelaxedBeanPropertyBindingResult: 1 errors
Field error in object 'zookeeper' on field 'connect': rejected value [null]; codes [NotBlank.zookeeper.connect,NotBlank.connect,NotBlank.java.lang.String,NotBlank]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [zookeeper.connect,connect]; arguments []; default message [connect]]; default message [may not be empty]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'curatorConfiguration.ZookeeperProperties': Could not bind properties to CuratorConfiguration.ZookeeperProperties (prefix=zookeeper, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is org.springframework.validation.BindException: org.springframework.boot.bind.RelaxedDataBinder$RelaxedBeanPropertyBindingResult: 1 errors
Field error in object 'zookeeper' on field 'connect': rejected value [null]; codes [NotBlank.zookeeper.connect,NotBlank.connect,NotBlank.java.lang.String,NotBlank]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [zookeeper.connect,connect]; arguments []; default message [connect]]; default message [may not be empty]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:464)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1123)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1192)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1116)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014)
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:813)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741)
... 18 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'curatorConfiguration.ZookeeperProperties': Could not bind properties to CuratorConfiguration.ZookeeperProperties (prefix=zookeeper, ignoreInvalidFields=false, ignoreUnknownFields=true, ignoreNestedProperties=false); nested exception is org.springframework.validation.BindException: org.springframework.boot.bind.RelaxedDataBinder$RelaxedBeanPropertyBindingResult: 1 errors
Field error in object 'zookeeper' on field 'connect': rejected value [null]; codes [NotBlank.zookeeper.connect,NotBlank.connect,NotBlank.java.lang.String,NotBlank]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [zookeeper.connect,connect]; arguments []; default message [connect]]; default message [may not be empty]
at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:339)
at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:289)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1192)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1116)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014)
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:813)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741)
... 32 more
Caused by: org.springframework.validation.BindException: org.springframework.boot.bind.RelaxedDataBinder$RelaxedBeanPropertyBindingResult: 1 errors
Field error in object 'zookeeper' on field 'connect': rejected value [null]; codes [NotBlank.zookeeper.connect,NotBlank.connect,NotBlank.java.lang.String,NotBlank]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [zookeeper.connect,connect]; arguments []; default message [connect]]; default message [may not be empty]
at org.springframework.boot.bind.PropertiesConfigurationFactory.validate(PropertiesConfigurationFactory.java:362)
at org.springframework.boot.bind.PropertiesConfigurationFactory.doBindPropertiesToTarget(PropertiesConfigurationFactory.java:271)
at org.springframework.boot.bind.PropertiesConfigurationFactory.bindPropertiesToTarget(PropertiesConfigurationFactory.java:241)
at org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor.postProcessBeforeInitialization(ConfigurationPropertiesBindingPostProcessor.java:334)
... 46 more

[ekoutanov]

A ZooKeeper connection is required for Kafdrop 2.x.

You might want to consider moving on to Kafdrop 3.x, which obtains all the necessary Kafka cluster information using the Kafka Admin API (ZooKeeper is not required).