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https://issues.apache.org/jira/browse/DERBY-3354?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kathey Marsden updated DERBY-3354:
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Attachment: LocLeak.java
Atttached is a program to reproduce this issue.
Run java -Xmx16M LocLeak. I got the error on the 68000 row of retreival with
the free(). Sooner if I didn't call free.
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:2882)
at
java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100)
at
java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:390)
at java.lang.StringBuilder.append(StringBuilder.java:119)
at java.lang.Object.toString(Object.java:219)
at java.lang.String.valueOf(String.java:2827)
at java.lang.StringBuffer.append(StringBuffer.java:219)
at
org.apache.derby.impl.jdbc.EmbedConnection.restoreContextStack(EmbedConnection.java:1960)
at
org.apache.derby.impl.jdbc.ConnectionChild.restoreContextStack(ConnectionChild.java:131)
at org.apache.derby.impl.jdbc.UTF8Reader.fillBuffer(UTF8Reader.java:567)
at org.apache.derby.impl.jdbc.UTF8Reader.read(UTF8Reader.java:245)
at
org.apache.derby.impl.jdbc.ClobUpdatableReader.read(ClobUpdatableReader.java:154)
at org.apache.derby.impl.jdbc.EmbedClob.getSubString(EmbedClob.java:225)
at LocLeak.dump_db(LocLeak.java:50)
at LocLeak.main(LocLeak.java:13)
Note there may be problems freeing the locators on garbage collection, because
client relies upon them even after there is no embedded reference.
> Select from large lob table with embedded gives OutOfMemoryError
> ----------------------------------------------------------------
>
> Key: DERBY-3354
> URL: https://issues.apache.org/jira/browse/DERBY-3354
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Reporter: Kathey Marsden
> Attachments: LocLeak.java
>
>
> Retrieving from a large table with lobs gives an OutOfMemoryException, even
> if free() is explictly called on the lob. I believe this is because
> EmbedConnection.addLobMapping is called for every lob creation but is never
> cleared until commit or rollback, even if the lob is freed.
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