Knut Anders Hatlen created DERBY-5730:
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Summary: DataDictionaryImpl leaks references to itself via
SYSFUN_AD
Key: DERBY-5730
URL: https://issues.apache.org/jira/browse/DERBY-5730
Project: Derby
Issue Type: Bug
Components: Services
Affects Versions: 10.9.0.0
Reporter: Knut Anders Hatlen
DataDictionaryImpl contains a static field called SYSFUN_AD, which holds an
array of AliasDescriptor objects for the functions in the SYSFUN schema. This
array is lazily populated as the functions are called, and it is shared between
all DataDictionaryImpl instances on the system.
The AliasDescriptors contain references to the DataDictionaryImpl that created
them, so SYSFUN_AD may end up referencing indirectly to a number of different
DataDictionaryImpl instances, depending on where the respective SYSFUN
functions are called the first time. Once an AliasDescriptor has been added to
SYSFUN_AD, it stays there until the DataDictionaryImpl class is unloaded (in
most cases, until the JVM terminates). This means the array may hold references
to DataDictionaryImpl instances that belong to database instances that have
been shut down, and that the memory held by those database instances never
becomes eligible for garbage collection.
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