Re: Unable to @Autowire HazelcastInstance with Spring. Always getting a NullPointerException

[enes akar]

Do you have this:

<context:annotation-config />

in your spring configuration xml?

On Wed, Dec 5, 2012 at 9:55 PM, <claes....@gmail.com> wrote:

I've been using Hazelcast 1.9.2.3 for a while, using Hazelcast.getMap() and Hazelcast.getIdGenerator() and so on, but now trying to update to 2.4 all that is deprecated. 

At first I tried using Hazelcast.newHazelcastInstance(null) instead, but then I got lots of instances instead of just one per Tomcat like I want. Now I'm trying to use spring-hazelcast instead to get a HazelcastInstance with @Autowire. In my context.xml-file I have:

    <bean id="hzInstance" class="com.hazelcast.core.Hazelcast" factory-method="newHazelcastInstance">

        <constructor-arg>

            <bean class="com.hazelcast.config.Config"/> <!-- Default config... -->

        </constructor-arg>

    </bean>

And trying to use it like any other bean:

public class ExceptionLoggerImpl implements ExceptionLogger {

    @Autowired private NodeInfoService nodeInfoService;

    @Autowired private HazelcastInstance hzInstance;

    private final IMap<ExceptionDataKey, ExceptionDataInfo> exceptionMap = hzInstance.getMap("exceptionLogger-exceptionMap");

But it always fails in the following way:

Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [net.unikum.service.impl.ExceptionLoggerImpl]: Constructor threw exception; nested exception is java.lang.NullPointerException

at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:162)

at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:76)

at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:990)

... 110 more

Caused by: java.lang.NullPointerException

at net.unikum.service.impl.ExceptionLoggerImpl.<init>(ExceptionLoggerImpl.java:26)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)

... 112 more

Row 26 is where I do hzInstance.getMap(). I'm basically using the default hazelcast.xml config. I've tried converting it to a spring-config 

  <hz:hazelcast id="instance">

        <hz:config>

            <hz:group name="dev" password="dev-pass"/>

            <hz:network port="5701" port-auto-increment="false">

                <hz:join>

     ... and so on

but the result was always the same. If I remove the @Autowired private HazelcastInstance hzInstance; and the map everything starts up as normal. What do I have to do to get the hzInstance? 

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Enes Akar
http://www.linkedin.com/in/enesakar