Certain classloaders (AntClassLoader for example) cause NullPointerException in
impl.MessageFormatter
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Key: HIVEMIND-78
URL: http://nagoya.apache.org/jira/browse/HIVEMIND-78
Project: HiveMind
Type: Bug
Components: framework
Versions: 1.0, 1.1
Environment: MacOSX. Running unit tests of code running within hivemind using
JUnit inside Ant inside Maven.
Reporter: Paul Russell
MessageFormat uses java.lang.Class.getPackage() to obtain the name of the
package for the 'reference class' in order to choose an appropriate resource
bundle. Unfortunately, java.lang.Class.getPackage() does not guarantee to
return a Package object.
It may return 'null' if (a) the reference class is loaded by the primordial
classloader, or (b) if the classloader didn't create a package object and
associated it with the class.
I am seeing this problem while running unit tests of my application within
Maven. Example stacktrace follows:
java.lang.ExceptionInInitializerError
at
org.apache.hivemind.impl.RegistryImpl.getServicePoint(RegistryImpl.java:142)
at
org.apache.hivemind.impl.RegistryImpl.getService(RegistryImpl.java:149)
at org.apache.hivemind.impl.RegistryImpl.startup(RegistryImpl.java:321)
at
org.apache.hivemind.impl.RegistryBuilder.constructRegistry(RegistryBuilder.java:417)
... lots more
Caused by: java.lang.NullPointerException
at
org.apache.hivemind.impl.MessageFormatter.<init>(MessageFormatter.java:49)
at
org.apache.hivemind.impl.MessageFormatter.<init>(MessageFormatter.java:44)
at org.apache.hivemind.impl.ImplMessages.<clinit>(ImplMessages.java:45)
... 59 more
The only safe way that I can see to achieve the same effect as
Class.getPackage().getName() is to do something like:
String lReferenceClassName = referenceClass.getName();
String lPackageName =
lReferenceClassName.substring(0,lReferenceClassName.lastIndexOf('.'));
... probably as a private function within MessageFormat itself.
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