Exception in dropwizard service while creating Jersey Client

[Paras Goel]

Hi All,

I am getting the below exception while running my service which is using jersey client.I have tried to get resolved but still I don't have clue for the solution.

Please help to get resolve this exception: 

Exception in thread "main" com.fasterxml.jackson.databind.JsonMappingException: Can not instantiate value of type [simple type, class com.yammer.dropwizard.client.JerseyClientConfiguration] from String value; no single-String constructor/factory method (through reference chain: com.ge.workflow.MailPollerConfiguration["httpClient"])

        at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator._createFromStringFallbacks(StdValueInstantiator.java:422)

        at com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.createFromString(StdValueInstantiator.java:298)

        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromString(BeanDeserializer.java:424)

        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:129)

        at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:375)

        at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:107)

        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:308)

        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)

        at com.fasterxml.jackson.databind.ObjectMapper._readValue(ObjectMapper.java:2768)

        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1477)

        at com.yammer.dropwizard.config.ConfigurationFactory.build(ConfigurationFactory.java:63)

        at com.yammer.dropwizard.config.ConfigurationFactory.build(ConfigurationFactory.java:48)

        at com.yammer.dropwizard.cli.ConfiguredCommand.parseConfiguration(ConfiguredCommand.java:83)

        at com.yammer.dropwizard.cli.ConfiguredCommand.run(ConfiguredCommand.java:51)

        at com.yammer.dropwizard.cli.Cli.run(Cli.java:53)

        at com.yammer.dropwizard.Service.run(Service.java:61)

-----------------------------------------------

code snippet My Service class:

-----------------------------------------------

public void run(MailPollerConfiguration configuration,

Environment environment) throws NoSuchProviderException {

   final Client jerseyClient = new JerseyClientBuilder().using(configuration.getJerseyClientConfiguration())

                .using(environment)

                .build();

MailMonitor monitorObj = new MailMonitor(jerseyClient);

environment.addResource(monitorObj);

environment.manage(new MailPollerManager(monitorObj));

}

--------------------------------------

snippet Configuration file:

---------------------------------------

@Valid

    @NotNull

    @JsonProperty

    private JerseyClientConfiguration httpClient  = new JerseyClientConfiguration();

    public JerseyClientConfiguration getJerseyClientConfiguration() {

        return httpClient;

    }

---------------------------------------------

snippet yml file

-----------------------------------------------

#http Client property for jersey

httpClient: 

# The socket timeout value. If a read or write to the underlying

# TCP/IP connection hasn't succeeded after this duration, a

# timeout exception is thrown.

timeout: 500ms

# The connection timeout value. If a TCP/IP connection cannot be

# established in this time, a timeout exception is thrown.

connectionTimeout: 500ms

# The time a TCP/IP connection to the server is allowed to

# persist before being explicitly closed.

timeToLive: 1 hour

# If true, cookies will be persisted in memory for the duration

# of the client's lifetime. If false, cookies will be ignored

# entirely.

cookiesEnabled: false

[Coda Hale]

You need to indent the bits of your YAML file after "httpClient". It's being parsed as an empty string, and Jackson can't make a JerseyClientConfiguration out of an empty string.

---
Coda Hale
http://codahale.com

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[Paras Goel]

Thanks, you are genius,

It is working now :-)