Amichai Rothman created DOSGI-178:
-------------------------------------
Summary: NullPointerException when interface method declares
throwing custom exception
Key: DOSGI-178
URL: https://issues.apache.org/jira/browse/DOSGI-178
Project: CXF Distributed OSGi
Issue Type: Bug
Affects Versions: 1.4.0, 1.5
Environment: Oracle JDK 1.7.0_17, DOSGi 1.4.0/1.5.0, Karaf 2.3.1
(Aegis Databinding 2.7.2)
Reporter: Amichai Rothman
I'm getting an Aegis exception (stacktrace below) when trying to export a
service. It looks similar to CXF-3613, but that is closed as fixed in 2.7.1. I
also found mention of it in
http://mail-archives.apache.org/mod_mbox/cxf-dev/201301.mbox/%3c399bf167-4cdd-4e5c-b9ce-7dbdfc012...@apache.org%3E
from a few months ago but nothing further.
I tried debugging a bit, and it seems to fail when the service interface has a
method declaring a throws clause with a custom exception which is a trivial
Exception subclass (with no fields, just standard constructors). Somewhere down
the line of dependencies it reaches a java.lang.Class, which has a field of
type T[] named enumConstants, it tries to get the base type for component type
"T", which returns null, which causes the exception.
Update: I think I found a temporary workaround: I changed the custom exception
to extend RuntimeException instead of Exception, and changed the interface to
declare throwing RuntimeException instead of the custom exception, and now I no
longer see this exception occurring. The reason for using RuntimeException
(rather than Exception) is so that the rest of the code does not require any
modification - only the exception class and the interface are changed, and only
those will need to be reverted when a proper fix is released.
However, it's still bad that code needs to be changed in order for DOSGi to
work (one of its main selling points is transparency to OSGi services), plus
the code loses compile-time exception checking for users of the
interface/service.
java.lang.NullPointerException
at java.lang.reflect.Array.newArray(Native Method)[:1.7.0_17]
at java.lang.reflect.Array.newInstance(Array.java:70)[:1.7.0_17]
at
org.apache.cxf.aegis.type.TypeUtil.getTypeRelatedClass(TypeUtil.java:261)[178:org.apache.cxf.cxf-rt-databinding-aegis:2.7.2]
at
org.apache.cxf.aegis.type.AbstractTypeCreator.createTypeForClass(AbstractTypeCreator.java:108)[178:org.apache.cxf.cxf-rt-databinding-aegis:2.7.2]
at
org.apache.cxf.aegis.type.AbstractTypeCreator.createType(AbstractTypeCreator.java:402)[178:org.apache.cxf.cxf-rt-databinding-aegis:2.7.2]
at
org.apache.cxf.aegis.type.basic.BeanTypeInfo.getType(BeanTypeInfo.java:192)[178:org.apache.cxf.cxf-rt-databinding-aegis:2.7.2]
at
org.apache.cxf.aegis.type.basic.BeanType.getDependencies(BeanType.java:534)[178:org.apache.cxf.cxf-rt-databinding-aegis:2.7.2]
at
org.apache.cxf.aegis.databinding.AegisDatabinding.addDependencies(AegisDatabinding.java:394)[178:org.apache.cxf.cxf-rt-databinding-aegis:2.7.2]
at
org.apache.cxf.aegis.databinding.AegisDatabinding.addDependencies(AegisDatabinding.java:399)[178:org.apache.cxf.cxf-rt-databinding-aegis:2.7.2]
at
org.apache.cxf.aegis.databinding.AegisDatabinding.addDependencies(AegisDatabinding.java:399)[178:org.apache.cxf.cxf-rt-databinding-aegis:2.7.2]
at
org.apache.cxf.aegis.databinding.AegisDatabinding.initializeMessage(AegisDatabinding.java:371)[178:org.apache.cxf.cxf-rt-databinding-aegis:2.7.2]
at
org.apache.cxf.aegis.databinding.AegisDatabinding.initializeOperation(AegisDatabinding.java:283)[178:org.apache.cxf.cxf-rt-databinding-aegis:2.7.2]
at
org.apache.cxf.aegis.databinding.AegisDatabinding.initialize(AegisDatabinding.java:242)[178:org.apache.cxf.cxf-rt-databinding-aegis:2.7.2]
at
org.apache.cxf.service.factory.AbstractServiceFactoryBean.initializeDataBindings(AbstractServiceFactoryBean.java:86)[165:org.apache.cxf.cxf-rt-core:2.7.2]
at
org.apache.cxf.service.factory.ReflectionServiceFactoryBean.buildServiceFromClass(ReflectionServiceFactoryBean.java:475)[165:org.apache.cxf.cxf-rt-core:2.7.2]
at
org.apache.cxf.service.factory.ReflectionServiceFactoryBean.initializeServiceModel(ReflectionServiceFactoryBean.java:537)[165:org.apache.cxf.cxf-rt-core:2.7.2]
at
org.apache.cxf.service.factory.ReflectionServiceFactoryBean.create(ReflectionServiceFactoryBean.java:249)[165:org.apache.cxf.cxf-rt-core:2.7.2]
at
org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpoint(AbstractWSDLBasedEndpointFactory.java:101)[172:org.apache.cxf.cxf-rt-frontend-simple:2.7.2]
at
org.apache.cxf.frontend.ServerFactoryBean.create(ServerFactoryBean.java:159)[172:org.apache.cxf.cxf-rt-frontend-simple:2.7.2]
at
org.apache.cxf.dosgi.dsw.handlers.AbstractPojoConfigurationTypeHandler.createServerFromFactory(AbstractPojoConfigurationTypeHandler.java:208)[56:cxf-dosgi-ri-dsw-cxf:1.5.0.SNAPSHOT]
at
org.apache.cxf.dosgi.dsw.handlers.PojoConfigurationTypeHandler.createServer(PojoConfigurationTypeHandler.java:118)[56:cxf-dosgi-ri-dsw-cxf:1.5.0.SNAPSHOT]
at
org.apache.cxf.dosgi.dsw.service.RemoteServiceAdminCore.exportService(RemoteServiceAdminCore.java:119)[56:cxf-dosgi-ri-dsw-cxf:1.5.0.SNAPSHOT]
at
org.apache.cxf.dosgi.dsw.service.RemoteServiceAdminInstance$1.run(RemoteServiceAdminInstance.java:64)[56:cxf-dosgi-ri-dsw-cxf:1.5.0.SNAPSHOT]
at
org.apache.cxf.dosgi.dsw.service.RemoteServiceAdminInstance$1.run(RemoteServiceAdminInstance.java:58)[56:cxf-dosgi-ri-dsw-cxf:1.5.0.SNAPSHOT]
at java.security.AccessController.doPrivileged(Native Method)[:1.7.0_17]
at
org.apache.cxf.dosgi.dsw.service.RemoteServiceAdminInstance.exportService(RemoteServiceAdminInstance.java:58)[56:cxf-dosgi-ri-dsw-cxf:1.5.0.SNAPSHOT]
at
org.apache.cxf.dosgi.dsw.service.RemoteServiceAdminInstance.exportService(RemoteServiceAdminInstance.java:37)[56:cxf-dosgi-ri-dsw-cxf:1.5.0.SNAPSHOT]
at
org.apache.cxf.dosgi.topologymanager.exporter.TopologyManagerExport.doExportService(TopologyManagerExport.java:249)[72:cxf-dosgi-ri-topology-manager:1.5.0.SNAPSHOT]
at
org.apache.cxf.dosgi.topologymanager.exporter.TopologyManagerExport.access$300(TopologyManagerExport.java:50)[72:cxf-dosgi-ri-topology-manager:1.5.0.SNAPSHOT]
at
org.apache.cxf.dosgi.topologymanager.exporter.TopologyManagerExport$3.run(TopologyManagerExport.java:214)[72:cxf-dosgi-ri-topology-manager:1.5.0.SNAPSHOT]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[:1.7.0_17]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[:1.7.0_17]
at java.lang.Thread.run(Thread.java:722)[:1.7.0_17]
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