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From "Kristian Waagan (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-5605) Calling Blob/Clob free() explicitly after implicit free throws exception in client driver
Date Mon, 06 Feb 2012 14:41:59 GMT
Calling Blob/Clob free() explicitly after implicit free throws exception in client driver

                 Key: DERBY-5605
                 URL: https://issues.apache.org/jira/browse/DERBY-5605
             Project: Derby
          Issue Type: Bug
          Components: Network Client
    Affects Versions:
            Reporter: Kristian Waagan
            Priority: Trivial

If a Blob or Clob is freed implicitly in the client driver, calling free explicitly afterwards
will throw an exception. Instead, this should probably be a no-op.

To reproduce, do something like this:
    Clob c = con.createClob();

Caused by: org.apache.derby.client.am.SqlException: You cannot invoke other java.sql.Clob/java.sql.Blob
methods after calling the free() method or after the Blob/Clob's transaction has been committed
or rolled back.
        at org.apache.derby.client.am.CallableLocatorProcedures.handleInvalidLocator(CallableLocatorProcedures.java:1071)
        at org.apache.derby.client.am.CallableLocatorProcedures.clobReleaseLocator(CallableLocatorProcedures.java:664)
        at org.apache.derby.client.am.Clob.free(Clob.java:844)
        ... 38 more
Caused by: org.apache.derby.client.am.SqlException: The exception 'java.sql.SQLException:
The locator that was supplied for this CLOB/BLOB is invalid' was thrown while evaluating an
        at org.apache.derby.client.am.Statement.completeExecute(Statement.java:1604)
        at org.apache.derby.client.net.NetStatementReply.parseEXCSQLSTTreply(NetStatementReply.java:322)
        at org.apache.derby.client.net.NetStatementReply.readExecuteCall(NetStatementReply.java:106)
        at org.apache.derby.client.net.StatementReply.readExecuteCall(StatementReply.java:75)
        at org.apache.derby.client.net.NetStatement.readExecuteCall_(NetStatement.java:175)
        at org.apache.derby.client.am.Statement.readExecuteCall(Statement.java:1570)
        at org.apache.derby.client.am.PreparedStatement.flowExecute(PreparedStatement.java:2156)
        at org.apache.derby.client.am.PreparedStatement.executeX(PreparedStatement.java:1599)
        at org.apache.derby.client.am.CallableLocatorProcedures.clobReleaseLocator(CallableLocatorProcedures.java:662)
        ... 39 more
Caused by: org.apache.derby.client.am.SqlException: The locator that was supplied for this
CLOB/BLOB is invalid
        ... 48 more

The problem dosen't exist in the embedded driver.
The immediate cause seems to be that the client driver state becomes out of sync with the
server side. This may be fixable by dealing specifically witht the invalid locator exception
in free().

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