[weld-issues] [JBoss JIRA] Created: (WELD-471) Weld SE, Instance<> and @New - NPE

[Wujek Srujek (JIRA)]

Weld SE, Instance<> and @New - NPE
----------------------------------

                 Key: WELD-471
                 URL: https://jira.jboss.org/jira/browse/WELD-471
             Project: Weld
          Issue Type: Bug
          Components: Built-in beans
    Affects Versions: 1.0.1.Final
            Reporter: Wujek Srujek
            Priority: Minor


For a bean:

@ApplicationScoped
public class SomeBean {

    private double d = Math.random();

    public double getD() {
        return d;
    }
}

and an injection point:

@Inject
@New
private Instance<SomeBean> i;

and when I start Weld SE I get:

Exception in thread "main" java.lang.NullPointerException
 at org.jboss.weld.util.Beans.getInitializerMethods(Beans.java:395)
 at org.jboss.weld.bean.AbstractClassBean.initInitializerMethods(AbstractClassBean.java:252)
 at org.jboss.weld.bean.AbstractClassBean.<init>(AbstractClassBean.java:164)
 at org.jboss.weld.bean.ManagedBean.<init>(ManagedBean.java:317)
 at org.jboss.weld.bean.NewManagedBean.<init>(NewManagedBean.java:66)
 at org.jboss.weld.bean.NewManagedBean.of(NewManagedBean.java:48)
 at org.jboss.weld.bootstrap.AbstractBeanDeployer.createNewManagedBean(AbstractBeanDeployer.java:244)
 at org.jboss.weld.bootstrap.BeanDeployer.createBeans(BeanDeployer.java:124)
 at org.jboss.weld.bootstrap.BeanDeployment.deployBeans(BeanDeployment.java:151)
 at org.jboss.weld.bootstrap.WeldBootstrap.deployBeans(WeldBootstrap.java:377)
 at org.jboss.weld.environment.se.Weld.initialize(Weld.java:79)
 at org.jboss.weld.environment.se.StartMain.go(StartMain.java:45)
 at test.Test.main(Test.java:10)

When I specify @New.value:

@Inject
@New(SomeBean.class)
private Instance<SomeBean> i;

it works. The exception is thrown from within Weld core somewhere. According to the API, @New.value is optional and "defaults the value to the declared type of the injection point", and for Instance, "the required type is the type parameter specified at the injection point". So I think it should be able to take the type parameter and not result in an error. Not sure about this.

Anyways, NPE should be changed to some more descriptive and friendly exception, describing what is wrong.

Please see the forum topic: http://seamframework.org/Community/WeldSEInstanceAndNewNPE

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