On 08/02/2021 11:28, John English wrote:
In the last few days I've suddenly had a bunch of OOM exceptions. I'm
using Derby 10.9.1.0, Oracle Java 1.8.0 on Ubuntu 64-bit, and haven't
upgraded for a while (probably years, looking at those numbers).
The place where they happen is in a call to executeQuery() in a method
which displays a view as a table.
Following on from what I wrote earlier, another of the heap dumps shows
the exception happening at the same executeQuery() call, but the first
few stack trace look like this:
at org.apache.derby.iapi.types.SQLChar.<init>(Ljava/lang/String;)V
(Unknown Source)
at org.apache.derby.iapi.types.SQLVarchar.<init>(Ljava/lang/String;)V
(Unknown Source)
at
org.apache.derby.iapi.types.SQLVarchar.cloneValue(Z)Lorg/apache/derby/iapi/types/DataValueDescriptor;
(Unknown Source)
at
org.apache.derby.impl.sql.execute.BasicSortObserver.getClone([Lorg/apache/derby/iapi/types/DataValueDescriptor;)[Lorg/apache/derby/iapi/types/DataValueDescriptor;
(Unknown Source)
at
org.apache.derby.impl.sql.execute.BasicSortObserver.insertNonDuplicateKey([Lorg/apache/derby/iapi/types/DataValueDescriptor;)[Lorg/apache/derby/iapi/types/DataValueDescriptor;
(Unknown Source)
at
org.apache.derby.impl.store.access.sort.SortBuffer.insert([Lorg/apache/derby/iapi/types/DataValueDescriptor;)I
(Unknown Source)
at
org.apache.derby.impl.store.access.sort.MergeInserter.insert([Lorg/apache/derby/iapi/types/DataValueDescriptor;)V
(Unknown Source)
at
org.apache.derby.impl.sql.execute.SortResultSet.loadSorter()Lorg/apache/derby/iapi/store/access/ScanController;
(Unknown Source)
The leak suspects seem to be the same:
One instance of "org.apache.derby.impl.store.access.sort.SortBuffer"
loaded by "org.eclipse.jetty.webapp.WebAppClassLoader @ 0xf047e888"
occupies 157,386,240 (74.59%) bytes. The memory is accumulated in one
instance of "org.apache.derby.impl.store.access.sort.SortBuffer", loaded
by "org.eclipse.jetty.webapp.WebAppClassLoader @ 0xf047e888", which
occupies 157,386,240 (74.59%) bytes.
One instance of "org.apache.derby.impl.services.cache.ConcurrentCache"
loaded by "org.eclipse.jetty.webapp.WebAppClassLoader @ 0xf047e888"
occupies 42,742,864 (20.26%) bytes. The memory is accumulated in one
instance of "org.apache.derby.impl.services.cache.ConcurrentCache",
loaded by "org.eclipse.jetty.webapp.WebAppClassLoader @ 0xf047e888",
which occupies 42,742,864 (20.26%) bytes.
--
John English
