Rex Wang created CXF-4947:
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Summary: Potential problems with the JAXBContext being null
Key: CXF-4947
URL: https://issues.apache.org/jira/browse/CXF-4947
Project: CXF
Issue Type: Bug
Components: JAXB Databinding
Affects Versions: 2.6.7, 2.7.4
Reporter: Rex Wang
Fix For: 2.6.8, 2.7.5
I post a mail to mail list to describe this. And Daniel fixed it very quickly.
I still open this JIRA to record this issue, so that I can get a numbered patch
merging to my runtime. Thanks.
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hi devs,
I found some intermittent NullpointerException, and it is very hard to
reproduce but I did have met a lot of times, and it is thrown from different
places from runtime:
Stack Dump = java.lang.NullPointerException
at
org.apache.cxf.common.jaxb.JAXBUtils.generateJaxbSchemas(JAXBUtils.java:765)
at
org.apache.cxf.jaxb.JAXBDataBinding.generateJaxbSchemas(JAXBDataBinding.java:440)
at org.apache.cxf.jaxb.JAXBDataBinding.initialize(JAXBDataBinding.java:363)
at
org.apache.cxf.service.factory.AbstractServiceFactoryBean.initializeDataBindings(AbstractServiceFactoryBean.java:86)
at
org.apache.cxf.service.factory.ReflectionServiceFactoryBean.buildServiceFromClass(ReflectionServiceFactoryBean.java:469)
at
org.apache.cxf.jaxws.support.JaxWsServiceFactoryBean.buildServiceFromClass(JaxWsServiceFactoryBean.java:690)
at
org.apache.cxf.service.factory.ReflectionServiceFactoryBean.initializeServiceModel(ReflectionServiceFactoryBean.java:531)
at
org.apache.cxf.service.factory.ReflectionServiceFactoryBean.create(ReflectionServiceFactoryBean.java:247)
After checking the codes, they are all about the jaxbcontext is null.
>From the JAXBContextCache.CachedContextAndSchemas, I notice this line:
private WeakReference<JAXBContext> context;
IMHO, WeakReference is not a good choice to do cache, it could be gc in any
time. For example,
JAXBContextCache.getCachedContextAndSchemas(..)
<gc>
ctx = cachedContextAndSchemas.getContext() <-- then the ctx will be null here
So I guess this is the root cause of the intermittent issue.
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